Candela is the unit of
A)
Electric intensity
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B)
Luminous intensity
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C)
Sound intensity
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D)
None of these
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View Answer play_arrow
The displacement of a particle, moving in a straight line, is given by \[s=2{{t}^{2}}+2t+4\] where 5 is in metres and t in seconds. The acceleration of the particle is
A)
\[2\text{ }m/{{s}^{2}}\]
done
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B)
\[~4\text{ }m/{{s}^{2}}\]
done
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C)
\[~6\text{ }m/{{s}^{2}}\]
done
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D)
\[~8\text{ }m/{{s}^{2}}\]
done
clear
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A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 s for every circular loop. The average velocity and average speed for each circular loop respectively is:
A)
0, 0
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B)
0, 10 m/s
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C)
10 m/s, 10 m/s
done
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D)
10 m/s, 0
done
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A man weighing 80 kg is standing in a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley with a speed of 1 m/s, then after 4 sec his displacement relative to the ground will be
A)
5 m
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B)
4.8 m
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C)
3.2 m
done
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D)
3.0 m
done
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A mass of 0.5 kg moving with a speed of 1.5 m/s on a horizontal smooth surface collides with a nearly weightless spring of force constant \[k=50\,n/m.\]The maximum compression of the spring would be:
A)
0.15 m
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B)
0.12 m
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C)
1.5 m
done
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D)
0.5 m
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View Answer play_arrow
A wheel of radius 1 m rolls forward half a revolution on a horizontal ground. The magnitude of the displacement of the point of the wheel initially in contact with the ground is
A)
\[\pi \]
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B)
\[2\pi \]
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C)
\[\sqrt{2}\pi \]
done
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D)
\[\sqrt{{{\pi }^{2}}+4}\]
done
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View Answer play_arrow
Consider a system of two particles having masses \[{{m}_{1}}\]and\[{{m}_{2}}.\]If the particle of mass\[{{m}_{1}}\]is pushed towards the mass centre of particles through a distance d, by what distance would the particle of mass \[{{m}_{2}}\]move so as to keep the mass centre of particles at the original position?
A)
\[\frac{{{m}_{1}}}{{{m}_{1}}+{{m}_{2}}}d\]
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B)
\[\frac{{{m}_{1}}}{{{m}_{2}}}d\]
done
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C)
d
done
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D)
\[\frac{{{m}_{2}}}{{{m}_{1}}}d\]
done
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The acceleration due to gravity on the planet A is 9 times the acceleration due to gravity on planet B. A man jumps to a height of 2 m on the surface of A. What is the height of jump by the same person on the planet B?
A)
\[\frac{2}{3}m\]
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B)
\[\frac{2}{9}m\]
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C)
18 m
done
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D)
6 m
done
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View Answer play_arrow
For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is
A)
2
done
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B)
\[\frac{1}{2}\]
done
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C)
\[\frac{1}{\sqrt{2}}\]
done
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D)
\[\sqrt{2}\]
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View Answer play_arrow
Copper of fixed volume V is drawn into wire of length \[l.\] When this wire is subjected to a constant force F, the extension produced in the wire is \[\Delta l.\]Which of the following graphs is a straight line?
A)
\[\Delta l\] versus\[\frac{1}{l}\]
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B)
\[\Delta l\]versus \[{{l}^{2}}\]
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C)
\[\Delta l\]versus\[\frac{1}{{{l}^{2}}}\]
done
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D)
\[\Delta l\]versus \[l\]
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View Answer play_arrow
A wind with speed 40 m/s blows parallel to the roof of a house. The area of the roof is \[250\text{ }{{m}^{2}}.\] Assuming that the pressure inside the house is atmospheric pressure, the force exerted by the wind on the roof and the direction of the force will be\[({{P}_{air}}=1.2\,kg/{{m}^{3}})\]
A)
\[4.8\times {{10}^{5}}N,\] downwards
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B)
\[4.8\times {{10}^{5}}N,\]upwards
done
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C)
\[2.4\times {{10}^{5}}N,\]upwards
done
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D)
\[2.4\times {{10}^{5}}N,\] downwards
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View Answer play_arrow
Which of the following is the example of ideal black body?
A)
Kajal
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B)
Blackboard
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C)
A pin hole in a box
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D)
None of these
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View Answer play_arrow
We consider the radiation emitted by the human body. Which of the following statements is true?
A)
The radiation is emitted only during the day
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B)
The radiation is emitted during the summers and absorbed during the winters
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C)
The radiation emitted lies in the ultraviolet region and hence is not visible
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D)
The radiation emitted is in the infrared region
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View Answer play_arrow
Efficiency of a Carnot engine is 50% when temperature of outlet is 500 K-. In order to increase efficiency up to 60% keeping temperature of intake the same what is temperature of outlet
A)
200 K
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B)
400 K
done
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C)
600 K
done
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D)
800 K
done
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View Answer play_arrow
The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be:
A)
\[PV=(5/32)RT\]
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B)
\[PV=5RT\]
done
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C)
\[PV=(5/2)RT\]
done
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D)
\[PV=(5/16)RT\]
done
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View Answer play_arrow
There is a body having mass m and performing SHM with amplitude a. There is a restoring force \[F=-Kx,\]where\[x\] is the displacement. The total energy of body depends upon
A)
\[K,x\]
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B)
\[K,a\]
done
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C)
\[K,a,x\]
done
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D)
\[K,a,v\]
done
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View Answer play_arrow
The time period of a mass suspended from a spring is T. If the spring is cut into four equal parts and the same mass is suspended from one of the parts, then the new time period will be
A)
T
done
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B)
\[\frac{T}{2}\]
done
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C)
\[2T\]
done
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D)
\[\frac{T}{4}\]
done
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View Answer play_arrow
The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A?
A)
2
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B)
4
done
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C)
\[\frac{1}{2}\]
done
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D)
1
done
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View Answer play_arrow
The driver of a car travelling with speed \[30\,m{{s}^{-1}}\] towards a hill sounds a horn of frequency 600 Hz. If the velocity of sound in air is\[330\,m{{s}^{-1}},\]the frequency of reflected sound as heard by driver is
A)
550 Hz
done
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B)
555.5 Hz
done
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C)
720 HZ
done
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D)
500 Hz
done
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View Answer play_arrow
The mean free path of electrons in a metal is \[4\times {{10}^{-8}}m.\]The electric field which can give on an average 2 eV energy to an electron in the metal will be in unit of \[V{{m}^{-1}}\]
A)
\[8\times {{10}^{-7}}\]
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B)
\[5\times {{10}^{-11}}\]
done
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C)
\[8\times {{10}^{-11}}\]
done
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D)
\[5\times {{10}^{7}}\]
done
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View Answer play_arrow
The electric potential V at any point \[(x,y,z),\]all in metres in space is given by \[V=4{{x}^{2}}\]volt. The electric field at the point (1,0,2) in volt/metre is
A)
8 along positive X-axis
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B)
16 along negative Y-axis
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C)
16 along positive X-axis
done
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D)
8 along, negative X-axis
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View Answer play_arrow
As per this diagram a point charge + q is placed at the origin O. Work done in taking another point charge -Q from the point A [co-ordinates (0, a)] to another point B [co-ordinates (a, 0)] along the straight path AB is
A)
Zero
done
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B)
\[\left( \frac{-qQ}{4\pi {{\varepsilon }_{0}}}\frac{1}{{{a}^{2}}} \right)\sqrt{2}\,a\]
done
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C)
\[\left( \frac{qQ}{4\pi {{\varepsilon }_{0}}}\frac{1}{{{a}^{2}}} \right)\frac{a}{\sqrt{2}}\]
done
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D)
\[\left( \frac{qQ}{4\pi {{\varepsilon }_{0}}}\frac{1}{{{a}^{2}}} \right)\sqrt{2}\]
done
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View Answer play_arrow
Two condensers, one of capacity C and the other of capacity C/2, are connected to a F volt battery, as shown.
The work done in charging fully both the condensers is
A)
\[2C{{V}^{2}}\]
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B)
\[\frac{1}{4}C{{V}^{2}}\]
done
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C)
\[\frac{3}{4}C{{V}^{2}}\]
done
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D)
\[\frac{1}{2}C{{V}^{2}}\]
done
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View Answer play_arrow
A 6 V battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of \[100\Omega .\]The difference of potential, between two points on the wire separated by a distance or 50 cm, will be
A)
2 V
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B)
3 V
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C)
1 V
done
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D)
1.5 V
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View Answer play_arrow
In a Wheatstone's bridge all the four arms have equal resistance R. If the resistance of the galvanometer arm is also R, the equivalent resistance of the combination as seen by the battery is
A)
\[\frac{R}{2}\]
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B)
R
done
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C)
2 R
done
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D)
\[\frac{R}{4}\]
done
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View Answer play_arrow
A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of \[10\,\Omega .\] Its internal resistance is
A)
\[1.0\Omega \]
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B)
\[0.5\,\Omega \]
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C)
\[2.0\,\Omega \]
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D)
zero
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View Answer play_arrow
The rate of increase of thermo-emf with temperature at the neutral temperature of a thermo- couple
A)
is zero
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B)
depends upon the choice of the two materials of the thermocouple
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C)
is negative
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D)
is positive
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View Answer play_arrow
An electric current passes through a long straight wire. At a distance 5 cm from the wire the magnetic field is B. The field at 20 cm from the wire would be
A)
\[\frac{B}{6}\]
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B)
\[\frac{B}{4}\]
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C)
\[\frac{B}{3}\]
done
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D)
\[\frac{B}{2}\]
done
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View Answer play_arrow
A galvanometer of \[50\,\Omega \]resistance has 25 divisions. A current of \[4\times {{10}^{-4}}\] A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 V, it should be connected with a resistance of
A)
\[2500\,\Omega \] as a shunt
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B)
\[245\,\Omega \] as a shunt
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C)
\[2550\,\Omega \]in series
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D)
\[2450\,\Omega \] in series
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View Answer play_arrow
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
A)
paramagnetism
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B)
anti-ferromagnetism
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C)
no magnetic property
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D)
diamagnetism
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View Answer play_arrow
A compass needle which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It
A)
will stay in east-west direction only
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B)
will become rigid showing no movement
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C)
will stay in any position
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D)
will stay in north-south direction only
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View Answer play_arrow
A conducting square frame of side a and a long straight wire carrying current / are located in the same plane as shown in the figure. The frame moves to the right with a constant velocity V. The emf induced in the frame will be proportional to
A)
\[\frac{1}{{{x}^{2}}}\]
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B)
\[\frac{1}{{{(2x-a)}^{2}}}\]
done
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C)
\[\frac{1}{{{(2x+a)}^{2}}}\]
done
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D)
\[\frac{1}{(2x-a)(2x+a)}\]
done
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View Answer play_arrow
A conducting circular loop is placed in a uniform magnetic field 0.04 T with its plane perpendicular to the magnetic field. The radius of the loop starts shrinking at \[2mm{{s}^{-1}}.\] The induced emf in the loop when the radius is 2 cm is
A)
\[3.2\,\pi \mu V\]
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B)
\[4.8\,\pi \mu V\]
done
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C)
\[0.8\,\pi \mu V\]
done
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D)
\[1.6\,\pi \mu V\]
done
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View Answer play_arrow
In the given circuit the reading of voltmeter \[{{V}_{1}}\]and \[{{V}_{2}}\]are 300 V each. The reading to the voltmeter \[{{V}_{3}}\]and ammeter A are respectively
A)
150 V, 2.2 A
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B)
200 V, 2.2 A
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C)
220 V, 2.0 A
done
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D)
100 V, 2.0 A
done
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View Answer play_arrow
The instantaneous values of alternating current and voltages in a circuit are given as\[i=\frac{1}{\sqrt{2}}\sin (100\pi t)\]ampere\[e=\frac{1}{\sqrt{2}}\sin (100\pi t+\pi /3)\,\text{volt}\]. The average power in watts consumed in the circuit is
A)
\[\frac{1}{4}\]
done
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B)
\[\frac{\sqrt{3}}{4}\]
done
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C)
\[\frac{1}{2}\]
done
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D)
\[\frac{1}{8}\]
done
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View Answer play_arrow
Which of the following statement is false for the properties of electromagnetic waves?
A)
Both electric and magnetic field vectors attain the maxima and minima at the same place and the same time
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B)
The energy in electromagnetic wave is divided equally between electric and magnetic vectors
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C)
Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave
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D)
These waves do not require any material medium for propagation
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View Answer play_arrow
A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = velocity of light)
A)
\[\frac{E}{C}\]
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B)
\[\frac{2E}{C}\]
done
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C)
\[\frac{2E}{{{C}^{2}}}\]
done
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D)
\[\frac{E}{{{C}^{2}}}\]
done
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View Answer play_arrow
The chromatic aberration in lenses is due to
A)
Dissimilarity of main axis of rays
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B)
Dissimilarity of radii of curvature
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C)
Variation of focal length of lenses with wavelength
done
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D)
None of these
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View Answer play_arrow
The angular resolution of a 10 cm diameter telescope at a wavelength of \[5000\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]is of the order
A)
\[{{10}^{6}}rad\]
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B)
\[{{10}^{-2}}rad\]
done
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C)
\[{{10}^{-4}}rad\]
done
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D)
\[{{10}^{-6}}rad\]
done
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View Answer play_arrow
Red light is generally used to observe diffraction pattern from single slit. If blue light is used instead of red light, then diffraction pattern.
A)
Will be more-clear
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B)
Will contract
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C)
Will expanded
done
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D)
Will not be visualized
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View Answer play_arrow
In a double-slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single-slit pattern?
A)
0.2 mm
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B)
0.1 mm
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C)
0.5 mm
done
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D)
0.02 mm
done
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View Answer play_arrow
According to Einstein's photoelectric equation, the graph between the kinetic energy of photo- electrons ejected and the frequency of incident radiation is
A)
done
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B)
done
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C)
done
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D)
done
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View Answer play_arrow
A 5 W source emits monochromatic light of wavelength\[5000\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]. When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0 m the number of photoelectrons liberated will be reduced by a factor of
A)
4
done
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B)
8
done
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C)
16
done
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D)
2
done
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View Answer play_arrow
The energy of a hydrogen atom in the ground state is -13.6 eV. The energy of a\[H{{e}^{+}}\,ion\] in the first excited state will be
A)
-13.6 eV
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B)
-27.2 eV
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C)
-54.4 eV
done
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D)
-6.8 eV
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View Answer play_arrow
The transition from the state n = 3 to n = 1 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from
A)
\[2\to 1\]
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B)
\[3\to 2\]
done
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C)
\[4\to 2\]
done
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D)
\[4\to 3\]
done
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View Answer play_arrow
Percentage of Se in peroxidase anhydrase enzyme is 0.5% by weight (at. wt. = 78.4), then minimum molecular weight of peroxidase anhydrase enzyme is:
A)
\[1.568\times {{10}^{3}}\]
done
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B)
15.68
done
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C)
\[1.568\times {{10}^{4}}\]
done
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D)
\[2.136\times {{10}^{4}}\]
done
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View Answer play_arrow
The value of Planck's constant is \[6.63\times {{10}^{-34}}\,Js.\] The velocity of light is \[3.0\times {{10}^{8}}m{{s}^{-1}}.\] Which value is closest to the wavelength in nanometer of a quantum of light with frequency of\[8\times {{10}^{15}}{{s}^{-1}}?\]
A)
\[2\times {{10}^{-25}}nm\,\]
done
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B)
\[5\times {{10}^{-18}}\,nm\]
done
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C)
4 nm
done
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D)
\[3\times {{10}^{-7}}\,nm\]
done
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View Answer play_arrow
The species \[Ar,{{K}^{+}}\]and \[C{{a}^{2+}}\]contain the same number of electrons. In which order do their radii increase?
A)
\[C{{a}^{2+}}<{{K}^{+}}<Ar\]
done
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B)
\[{{K}^{+}}<Ar<C{{a}^{2+}}\]
done
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C)
\[Ar<{{K}^{+}}<C{{a}^{2+}}\]
done
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D)
\[C{{a}^{2+}}<Ar<{{K}^{+}}\]
done
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View Answer play_arrow
In\[X-H---Y,\]both X and Y are electronegative elements
A)
Electron density on X will increase and on H will decrease
done
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B)
In both electron density will decrease
done
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C)
In both electron density will increase
done
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D)
Electron density will decrease on X and will increase on H
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View Answer play_arrow
By what factor does the average velocity of a gaseous molecule increase when the temperature (in Kelvin) is doubled?
A)
1.4
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B)
2.0
done
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C)
2.8
done
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D)
4.0
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View Answer play_arrow
In a closed insulated container a liquid is stirred with a paddle to increase the temperature, which of the following is true?
A)
\[\Delta U+W\ne 0,q=0\]
done
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B)
\[\Delta U+W=q\ne 0\]
done
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C)
\[\Delta U+Q,W=q\ne 0\]
done
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D)
\[W=0,\Delta U=q\ne 0\]
done
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View Answer play_arrow
For which reaction\[{{K}_{p}}\ne {{K}_{c}}?\]
A)
\[2N{{O}_{2}}(g)\rightleftharpoons {{N}_{2}}(g)+{{O}_{2}}(g)\]
done
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B)
\[S{{O}_{2}}(g)+N{{O}_{2}}(g)\rightleftharpoons S{{O}_{3}}(g)+NO(g)\]
done
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C)
\[{{I}_{2}}(g)+{{H}_{2}}(g)\rightleftharpoons 2HI(g)\]
done
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D)
\[2C(s)+{{O}_{2}}(g)\xrightarrow{{}}2CO(g)\]
done
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View Answer play_arrow
In \[H{{S}^{-}},{{I}^{-}},R-N{{H}_{2}},N{{H}_{3}}\]order of proton accepting tendency will be
A)
\[{{I}^{-}}>N{{H}_{3}}>RN{{H}_{2}}>H{{S}^{-}}\]
done
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B)
\[N{{H}_{3}}>RN{{H}_{2}}>H{{S}^{-}}>{{I}^{-}}\]
done
clear
C)
\[RN{{H}_{2}}>N{{H}_{3}}>H{{S}^{-}}>{{I}^{-}}\]
done
clear
D)
\[H{{S}^{-}}>RN{{H}_{2}}>N{{H}_{3}}>{{I}^{-}}\]
done
clear
View Answer play_arrow
Oxidation no. of P in \[{{H}_{4}}{{P}_{2}}{{O}_{5}},\text{ }{{H}_{4}}{{P}_{2}}{{O}_{6}},\]and \[{{H}_{4}}{{P}_{2}}{{O}_{7}}\]are respectively
A)
+3, +4, +5
done
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B)
+4, +3, +5
done
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C)
+3, +5, +4
done
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D)
+5, +3, +4
done
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View Answer play_arrow
Which statement about zeolite is false?
A)
They are used as cation exchanger
done
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B)
They have open structure which enables them to take up small molecules
done
clear
C)
Zeolites are alumino silicates having three dimensional networks
done
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D)
Some of the\[SiO_{4}^{4-}\]units are replaced by \[AlO_{4}^{5-}\] and\[AlO_{6}^{9-}\]ions in zeolites
done
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View Answer play_arrow
Match List I (substance) with List II (processes) employed in the manufacture of the substance and select the correct option.
List I (Substances) List II (Processes) [a] Sulphuric acid (i) Haber's process [b] Steel (ii) Bessemer's process [c] Sodium hydroxide (iii) Lebanc process [d] Ammonia (iv) Contact process
A)
(A-i), (B-iv), (C-ii), (D-iii)
done
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B)
(A-i), (B-ii), (C-iii), (D-iv)
done
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C)
(A-iv), (B-iii), (C-ii), (D-i)
done
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D)
(A-iv), (B-ii), (C-iii), (D-i)
done
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View Answer play_arrow
\[{{H}_{2}}O\]is dipolar, whereas \[Be{{F}_{2}}\]is not. It is because
A)
the electronegativity of F is greater than O
done
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B)
\[{{H}_{2}}O\]involves H-bonding, whereas\[Be{{F}_{2}}\]is discrete molecule
done
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C)
\[{{H}_{2}}O\]is linear, and\[Be{{F}_{2}}\]is angular
done
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D)
\[{{H}_{2}}O\]is angular, and\[Be{{F}_{2}}\]is linear
done
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View Answer play_arrow
\[A{{l}_{2}}{{O}_{3}}\]can be converted to anhydrous \[AlC{{l}_{3}}\]by heating
A)
a mixture of\[A{{l}_{2}}{{O}_{3}}\]and carbon in dry \[C{{l}_{2}}\]gas
done
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B)
\[A{{l}_{2}}{{O}_{3}}\]with \[C{{l}_{2}}\] gas
done
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C)
\[A{{l}_{2}}{{O}_{3}}\] and HCl gas
done
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D)
\[A{{l}_{2}}{{O}_{3}}\] with NaCl in solid state
done
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View Answer play_arrow
Name the type of the structure of silicate in which one oxygen atom of \[{{[Si{{O}_{4}}]}^{4-}}\]is shared
A)
Three dimensional
done
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B)
Linear chain silicate
done
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C)
Sheet silicate
done
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D)
Pyrosilicate
done
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View Answer play_arrow
In Kjeldahl's method, nitrogen present is estimated as:
A)
\[{{N}_{2}}\]
done
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B)
\[~N{{H}_{3}}\]
done
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C)
\[~N{{O}_{2}}\]
done
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D)
none of these
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View Answer play_arrow
The Lassaigne's extract is boiled with conc. \[HN{{O}_{3}}\]while testing for halogens. By doing so it:
A)
increases the concentration of\[NO_{3}^{-}\]ions
done
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B)
decomposes \[N{{a}_{2}}S\]and NaCN, if formed
done
clear
C)
helps in the precipitation of AgCl
done
clear
D)
increases the solubility product of AgCl
done
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View Answer play_arrow
The stability of carbanions in the following:
Is in the order of:
A)
(2) > (3) > (4) > (1)
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B)
(4) > (2) > (3) > (1)
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C)
(1) > (3) > (2) > (4)
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D)
(1) > (2) > (3) > (4)
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View Answer play_arrow
The IUPAC name of the compound \[C{{H}_{3}}CH=CHC\text{ }\equiv \text{ }CH\]
A)
pent-4-yn-2-ene
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B)
pent-3-en-l-yne
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C)
pent-2-en-4-yne
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D)
pentl-lyn-3-ene
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View Answer play_arrow
Which of the following acids does not exhibit optical isomerism?
A)
Lactic acid
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B)
Tartaric acid
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C)
Maleicacid
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D)
done
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Two possible stereostructures of\[C{{H}_{3}}CHOH.COOH\]Which are optically active, are called:
A)
Enantiomers
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B)
Mesomers
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C)
Diastereomers
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D)
Atropisomers
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View Answer play_arrow
Benzene reacts with \[C{{H}_{2}}Cl\]in the presence of anhydrous \[AlC{{l}_{3}}\]to form
A)
xylene
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B)
toluene
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C)
chlorobenzene
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D)
benzylchloride
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View Answer play_arrow
Which of the following compounds will not undergo Friedel-Crafts reaction easily?
A)
Xylene
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B)
Nitrobenzene
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C)
Toluene
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D)
Cumene
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View Answer play_arrow
The greenhouse effect is because of the
A)
presence of gases, with in general are strong infrared absorbers, in the atmosphere
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B)
presence of\[C{{O}_{2}}\]only in the atmosphere
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C)
presence of \[{{O}_{3}}\] and \[C{{H}_{4}}\]in the atmosphere
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D)
\[{{N}_{2}}O\]and chlorofluorocarbons in the at- mosphere
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View Answer play_arrow
Which of the following is not a common component of photochemical smog?
A)
Ozone
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B)
Acrolein
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C)
Peroxyacetyl nitrate
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D)
Chlorofluorocarbons
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View Answer play_arrow
Number of neutrons in a parent nucleus X which gives\[_{7}{{N}^{14}}\]after two successive\[\beta -\]emissions would be
A)
6
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B)
7
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C)
8
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D)
9
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The half-life of a substance in a certain enzyme- catalysed reaction is 13 8 s. The time required for the concentration of the substance to fall from \[1.28\text{ }mg\text{ }{{L}^{-1}}\]to \[0.04\text{ }mg\text{ }{{L}^{-1}}\] is
A)
414 s
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B)
552 s
done
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C)
690 s
done
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D)
276 s
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View Answer play_arrow
Percentage of free space in a body-centred cubic unit cell is
A)
32%
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B)
34%
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C)
28%
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D)
30%
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View Answer play_arrow
A given metal crystallises out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?
A)
80 pm
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B)
108 pm
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C)
40 pm
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D)
127 pm
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View Answer play_arrow
The vapour pressure of two liquids P and Q are 80 ton- and 60 ton- respectively. The total vpour pressure obtained by mixing 3 mole of P and 2 mole of Q would be
A)
68 torr
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B)
20 torr
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C)
140 torr
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D)
72 torr
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View Answer play_arrow
\[{{p}_{A}}\]and\[{{p}_{B}}\]are the vapour pressure of pure liquid components, A and B, respectively of an ideal binary solution. If \[{{x}_{A}}\]represents the mole fraction of component A, the total pressure of the solution will be
A)
\[{{p}_{B}}+{{x}_{A}}({{p}_{B}}-{{p}_{A}})\]
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B)
\[{{p}_{A}}+{{x}_{A}}({{p}_{A}}-{{p}_{B}})\]
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C)
\[{{p}_{A}}+{{x}_{A}}({{p}_{B}}-{{p}_{A}})\]
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D)
\[{{p}_{B}}+{{x}_{A}}({{p}_{A}}-{{p}_{B}})\]
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View Answer play_arrow
Standard reduction potentials of the half reactions are given below:
\[{{F}_{2}}(g)+2{{e}^{-}}\xrightarrow{{}}2{{F}^{-}}(aq);{{E}^{o}}=+2.85\,V\] \[C{{l}_{2}}(g)+2{{e}^{-}}\xrightarrow{{}}2C{{l}^{-}}(aq);{{E}^{o}}=+1.36\,V\] \[B{{r}_{2}}(i)+2{{e}^{-}}\xrightarrow{{}}2B{{r}^{-}}(aq);{{E}^{o}}=+1.06\,V\] \[{{I}_{2}}(S)+2{{e}^{-}}\xrightarrow{{}}2{{I}^{-}}(aq);{{E}^{o}}=+0.53\,V\]
The strongest oxidizing and reducing agents respectively are
A)
\[{{F}_{2}}\]and\[{{I}^{-}}\]
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B)
\[B{{r}_{2}}\]and \[C{{l}^{-}}\]
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C)
\[C{{l}_{2}}\]and\[B{{r}^{-}}\]
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D)
\[C{{l}_{2}}\]and\[{{I}_{2}}\]
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View Answer play_arrow
The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is
A)
-1
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B)
-2
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C)
1
done
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D)
2
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View Answer play_arrow
Which property of colloids is not dependent on the, 2015 charge on colloidal particles?
A)
Tyndal effect
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B)
Coagulation
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C)
Electrophoresis
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D)
Electro-osmosis
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View Answer play_arrow
Which of the following statements about the advantage of roasting of sulphide ore before reduction is not true?
A)
\[\Delta G_{f}^{o}\]of the sulphide is greater than \[C{{S}_{2}}\]and\[{{H}_{2}}S\]
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B)
\[\Delta G_{f}^{o}\]is negative for roasting of sulphide ore to oxide
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C)
Roasting of the sulphide to oxide is ther-modynamically feasible
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D)
Carbon and hydrogen are suitable reducing agents for metal sulphides
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View Answer play_arrow
Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds, but not by the other?
A)
Is soluble in water
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B)
Is used as a food preservative
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C)
Forms 'acid-rain'.
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D)
Is a reducing agent
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View Answer play_arrow
S-S bond is not present in
A)
\[{{S}_{2}}O_{7}^{2-}\]
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B)
\[{{S}_{4}}O_{6}^{2-}\]
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C)
\[{{S}_{2}}O_{4}^{2-}\]
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D)
\[{{S}_{2}}O_{3}^{2-}\]
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View Answer play_arrow
Which of the following has greatest reducing power?
A)
HI
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B)
HBr
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C)
HCl
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D)
HF
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View Answer play_arrow
Which of the following gases is/are called rare gas?
A)
Ne
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B)
He
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C)
Kr
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D)
All of these
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View Answer play_arrow
Reason of lanthanide contraction is
A)
negligible screening effect of f-orbitals
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B)
increasing nuclear charge
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C)
decreasing nuclear charge
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D)
decreasing screening effect
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View Answer play_arrow
\[[Cr{{({{H}_{2}}O)}_{6}}]C{{l}_{3}}\] (at. no. of Cr = 24) has a magnetic moment of 3.83 BM. The correct distribution of 3d-electrons in the chromium of the complex:
A)
\[3d_{xy}^{1},3d_{yz}^{1},3d_{xz}^{1}\]
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B)
\[3d_{xy}^{1},3d_{yz}^{1},3d_{{{z}^{2}}}^{1}\]
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C)
\[(3d_{{{x}^{2}}-{{y}^{2}}}^{1}),3d_{{{z}^{2}}}^{1},3d_{xz}^{1}\]
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D)
\[3d_{xy}^{1},(3d_{{{x}^{2}}-{{y}^{2}}}^{1}),3d_{yz}^{1}\]
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View Answer play_arrow
In an \[S{{N}_{1}}\]reaction on chiral centers, there is
A)
100% retention
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B)
100% inversion
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C)
100% racemization
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D)
inversion more than retention leading to partial racemization
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View Answer play_arrow
Ethylene oxide when, treated with Grignard reagent yields:
A)
cyclopropyl alcohol
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B)
primary alcohol
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C)
secondary alcohol
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D)
tertiary alcohol
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View Answer play_arrow
Predict the products in the given reaction.
A)
done
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B)
done
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C)
done
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D)
done
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View Answer play_arrow
Nitrobenzene on reaction with conc. \[HN{{O}_{3}}/{{H}_{2}}S{{O}_{4}}\]at \[80-100{{\,}^{o}}C\]forms which one of the following products?
A)
1, 3-Dinitrobenzene
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B)
1, 4-Dinitrobenzene
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C)
1, 2, 4-Trinitrobenzene
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D)
1, 2-Dinitrobenzene
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View Answer play_arrow
In DNA, the complimentary bases are:
A)
adenine and thymine; guanine and uracil
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B)
adenine and guanine; thymine and cytosine
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C)
uracil and adenine; cytosine and guanine
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D)
adenine and thymine; guanine and cytosine
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View Answer play_arrow
Organisms that obtain energy by the oxidation of reduced inorganic compounds are called:
A)
Photo autotrophs
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B)
Chemo autotrophs
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C)
Saprozoic
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D)
Coproheterotrophs
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View Answer play_arrow
Which statement is correct for bacterial transduction?
A)
Transfer of some genes from one bacteria to another bacteria through virus
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B)
Transfer of some genes from one bacteria to another bacteria by conjugation
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C)
Bacteria obtained its DNA directly
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D)
Bacteria obtained DNA from other external source
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View Answer play_arrow
Which of the following propagates through leaf tip?
A)
Sprout-leaf plant
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B)
Marchantia
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C)
Moss
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D)
Walking fern
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View Answer play_arrow
In Arthropoda, head and thorax are often fused to form cephalothorax, but in which one of the following classes is the body divided into head, thorax and abdomen?
A)
Myriapoda
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B)
Crustacea
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C)
Arachnida and Crustacea
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D)
Insecta
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View Answer play_arrow
An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is:
A)
Campylotropous
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B)
Anatropous
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C)
Orthotropous
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D)
Hemitropous
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View Answer play_arrow
Passage cells are thin-walled cells found in:
A)
Central region of style through which the pollen tube grows towards the ovary
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B)
Endodermis of roots facilitating rapid transport of water from cortex to pericycle
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C)
Phloem elements that serve as entry points for substances for transport to other plant parts
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D)
Testa of seeds to enable emergence of growing embryonic axis during seed germination.
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View Answer play_arrow
In which one of the following preparations are you likely to come across cell junctions most frequently?
A)
Hyaline cartilage
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B)
Ciliated epithelium
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C)
Thrombocytes
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D)
Tendon
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View Answer play_arrow
A major breakthrough in the studies of cells came with the development of electron micro- scope. This is because:
A)
The resolution power of the electron microscope is much higher than that of the light microscope
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B)
The resolving power of the electron microscope is 200-350 nm as compared to 0.1-0.2 nm for the light microscope
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C)
Electron beam can pass through thick materials, whereas light microscopy requires thin sections
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D)
The electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
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View Answer play_arrow
Carrier ions like\[N{{a}^{+}}\]facilitate the absorption of substances like
A)
amino acids and glucose
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B)
glucose and fatty acids
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C)
fatty acids and glycerol
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D)
fructose and some amino acids
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View Answer play_arrow
In the somatic cell cycle:
A)
DNA replication takes place in S-phase
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B)
A short interphase is followed by a long mitotic phase
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C)
\[{{G}_{2}}\]phase follows mitotic phase
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D)
In\[{{G}_{1}}\]phase DNA content is double the amount of DNA present in the original cell
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View Answer play_arrow
The translocation of organic solutes in sieve tube members is supported by:
A)
Root pressure and transpiration pull
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B)
P-proteins
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C)
Mass flow involving a carrier and ATP
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D)
Cytoplasmic streaming
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View Answer play_arrow
Which of the following criteria does not pertain to facilitated transport?
A)
Requirement of special membrane proteins
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B)
High selectivity
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C)
Transport saturation
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D)
Uphill transport
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View Answer play_arrow
A free living nitrogen-fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is:
A)
Chlorella
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B)
Nostoc
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C)
Anabaena
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D)
Tolypothrix
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View Answer play_arrow
Which one of the following elements is plants is not remobillised?
A)
Sulphur
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B)
Phosphorus
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C)
Calcium
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D)
Potassium
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View Answer play_arrow
As compared to a C3-plant, how many additional molecules of ATP are needed for net production of one molecule of hexose sugar by C4- plants:
A)
Zero
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B)
Six
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C)
Two
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D)
Twelve
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View Answer play_arrow
Importance of day length in flowering of plants was first shown in:
A)
Cotton
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B)
Petunia
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C)
Lemna
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D)
Tobacco
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View Answer play_arrow
During which stage in the complete oxidation of glucose are the greatest number of ATP molecules formed from ADP.
A)
Glycolysis
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B)
Krebs cycle
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C)
Electron transport chain
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D)
Conversion of pyruvic acid to acetyl CoA
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View Answer play_arrow
The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called:
A)
Glycolysis
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B)
Fermentation
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C)
Aerobic respiration
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D)
Photorespiration
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View Answer play_arrow
Hormone responsible for senescence:
A)
ABA
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B)
Auxin
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C)
GA
done
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D)
Cytokinin
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View Answer play_arrow
Treatment of seed at low temperature under moist conditions to break its dormancy is called:
A)
Sclaritication
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B)
Vernalization
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C)
Chelation
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D)
Stratification
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View Answer play_arrow
Epithelial cells of the intestine involved in food absorption have on their surface:
A)
Zymogen granules
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B)
Pinocytic vesicles
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C)
Phagocytic vesicles
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D)
Microvilli
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View Answer play_arrow
What will happen if the secretion of parietal cells of gastric glands is blocked with an inhibitor?
A)
In the absence of HCI secretion, inactive pepsinogen is not converted into the active enzyme pepsin
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B)
Enterokinase will not be released from the duodenal mucosa and so trypsinogen is not converted to trypsin
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C)
Gastric juice will be deficient in chymosin
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D)
Gastric juice will be deficient in pepsinogen
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View Answer play_arrow
The majority of carbon dioxide produced by our body cells is transported to the lungs:
A)
Dissolved in the blood
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B)
As bicarbonates
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C)
As carbonates
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D)
Attached to hemoglobin
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View Answer play_arrow
Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:
A)
as bicarbonate ions
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B)
in the form of dissolved gas molecules
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C)
by binding to R.B.C.
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D)
as carbaminohaemoglobin
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View Answer play_arrow
The most active phagocytic white blood cells are:
A)
eosinophils and lymphocytes
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B)
neutrophils and monocytes
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C)
neutrophils and eosinophils
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D)
lymphocytes and macrophages
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View Answer play_arrow
Which one of the following plasma proteins is involved in the coagulation of blood?
A)
Fibrinogen
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B)
an albumin
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C)
serum amylase
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D)
a globulin
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View Answer play_arrow
A person is undergoing prolonged fasting. His urine will be found to contain abnormal quantities of:
A)
Fats
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B)
Amino acids
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C)
Ketones
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D)
Glucose
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View Answer play_arrow
Uricotelic mode of passing out nitrogenous wastes is found in:
A)
Insects and Amphibians
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B)
Reptiles and Birds
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C)
Birds and Annelids
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D)
Amphibians and Reptiles
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View Answer play_arrow
In human body, which one of the following is anatomically correct?
A)
Cranial nerve - 10 pairs
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B)
Floating ribs - 2 pairs
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C)
Collar bones - 3 pairs
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D)
Salivary glands - 1 pair
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View Answer play_arrow
The H-zone in the skeletal muscle fibre is due to:
A)
the absence of myofibrils in the central portion of A-band
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B)
the central gap between myosin filaments in the A-band
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C)
the central gap between actin filaments extending through myosin filaments in the A band
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D)
extension of myosin filaments in the central portion of the A-band.
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View Answer play_arrow
Which one of the following is an example of negative feedback loop in humans?
A)
Secretion of sweat glands and constriction of skin blood vessels when it is too hot
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B)
Constriction of skin blood vessels and contraction of skeletal muscles when it is too cold
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C)
Secretion of tears after falling of sand particles into the eye
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D)
Salivation of mouth at the sight of delicious food
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Which one of the following pairs correctly matches a hormone with a disease resulting from its deficiency?
A)
Relaxin - Gigantism
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B)
Prolactin - Cretinism
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C)
Parathyroid hormone - Tetany
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D)
Insulin - Diabetes insipidus
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View Answer play_arrow
Meiosis takes place in:
A)
Meiocyte
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B)
Conidia
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C)
Gemmule
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D)
Megaspore
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View Answer play_arrow
Why is vivipary an undesirable character for annual crop plants?
A)
It reduces the vigour of the plant
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B)
The seeds exhibit long dormancy
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C)
It adversely affects the fertility of the plant
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D)
The seeds cannot be stored under normal conditions for the next season
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View Answer play_arrow
In humans, at the end of the first meiotic division, the male germ cells differentiate into the:
A)
spermatids
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B)
spermatogonia
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C)
primary spermatocytes
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D)
secondary spermatocytes
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View Answer play_arrow
Tubectomy is the method of sterilization in which:
A)
small part of the fallopian tube is removed or tied up
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B)
ovaries are removed surgically
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C)
small part of vas deferens is removed or tied up
done
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D)
uterus is removed surgically
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View Answer play_arrow
The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes:
A)
Seven
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B)
Six
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C)
Five
done
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D)
Four
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View Answer play_arrow
Genetic map is one that:
A)
Establishes sites of the genes on a chromo- some
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B)
Establishes the various stages in gene evolution
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C)
Shows the stages during the cell division
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D)
Shows the distribution of various species in a region
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View Answer play_arrow
Convergent evolution is illustrated by:
A)
Rat and dog
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B)
Bacterium and protozoan
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C)
Starfish and cuttlefish
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D)
Dogfish and whale
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View Answer play_arrow
AIDS is caused by HIV that principally infects
A)
Activator B cells
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B)
T4 lymphocytes
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C)
Cytotoxic T cells
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D)
All lymphocytes
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View Answer play_arrow
Crop plants grown in monoculture are
A)
Low in yield
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B)
Free from intraspecific competition
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C)
Characterised by poor root system
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D)
Highly prone to pests
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View Answer play_arrow
Monascus purpureus is a yeast used commercially in the production of:
A)
Citric acid
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B)
Blood cholesterol lowering statins
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C)
Ethanol
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D)
Streptokinase for removing clots from the blood vessels
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View Answer play_arrow
The colonies of recombinant bacteria appear white in contrast to blue colonies of non- recombinant bacteria because of:
A)
Non-recombinant bacteria containing beta-galactosidase
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B)
Insertional inactivation ofalpha-galacto- sidase in non-recombinant bacteria
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C)
Insertional inactivation ofalpha-galacto- sidase in recombinant bacteria
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D)
Inactivation of glycosidase enzyme in recombinant bacteria
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View Answer play_arrow
The first human hormone produced by recombinant DNA technology is:
A)
Insulin
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B)
Estrogen
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C)
Thyroxin
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D)
Progesterone
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View Answer play_arrow
What is a keystone species?
A)
A common species that has plenty of biomass, yet has a fairly low impact on the community's organization
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B)
A rare species that has minimal impact on the biomass and on other species in the community
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C)
A dominant species that constitutes a large proportion of the biomass and which affects many other species
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D)
A species which makes up only a small proportion of the total biomass of a community, yet has a huge impact on the community's organization and survival
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View Answer play_arrow
Dough kept overnight in warm weather becomes soft and spongy because of:
A)
Fermentation
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B)
Cohesion
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C)
Osmosis
done
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D)
Absorption of carbon dioxide from atmosphere
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View Answer play_arrow
Gray spots of oat are caused by deficiency of:
A)
Cu
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B)
Zn
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C)
Mn
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D)
Fe
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View Answer play_arrow
PGA as the first \[C{{O}_{2}}\]fixation product was dis-covered in photosynthesis of:
A)
Bryophyte
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B)
Gymnosperm
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C)
Angiosperm
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D)
Algae
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View Answer play_arrow
Chromatophores take part in:
A)
Respiration
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B)
Photosynthesis
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C)
Growth
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D)
Movement
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Phototropic curvature is the result of uneven distribution of:
A)
Gibberellin
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B)
Phytochrome
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C)
Cytokinins
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D)
Auxin
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The purplish red pigment rhodopsin contained in the rods type of photo receptor cells of the human eye is a derivative of:
A)
Vitamin A
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B)
Vitamin B 1
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C)
Vitamin C
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D)
Vitamin D
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Which one of the following is the correct statement for respiration in humans?
A)
Workers in grinding and stone-breaking industries may suffer, from lung fibrosis
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B)
About 90% of carbon dioxide \[(C{{O}_{2}})\] is carried by haemoglobin as carbamino- haemoglobin
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C)
Cigarette smoking may lead to inflammation of bronchi
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D)
Neural signals from pneumotoxic centre in pons region of brain can increase the duration of inspiration
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You are required to draw blood from a patient and to keep it in a test tube for analysis of blood corpuscles and plasma. You are also provided with the following four types of test tubes. Which of them will you not use for the purpose?
A)
Chilled test tube
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B)
Test tube containing heparin
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C)
Test tube containing sodium oxalate
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D)
Test tube containing calcium bicarbonate
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Which one of the following characteristics is common both in humans and adult frogs?
A)
Internal fertilization
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B)
Nucleated RBCs
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C)
Ureotelic mode of excretion
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D)
Four-chambered heart
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Select the correct statement regarding the specific disorder of muscular or skeletal system
A)
Myasthenia gravis - autoimmune disorder which inhibits sliding of myosin filaments
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B)
Gout - inflammation of joints due to extra deposition of calcium
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C)
Muscular dystrophy - age related shorting of muscles
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D)
Osteoporosis - decrease in bone mass and higher chances of fractures with advancing age
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In which animal nerve cell is present but brain is absent?
A)
Sponge
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B)
Earthworm
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C)
Cockroach
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D)
Hydra
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Which part of human brain is concerned with the regulation of body temperature?
A)
Hypothalamus
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B)
Medulla oblongata
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C)
Cerebellum
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D)
Cerebrum
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Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter:
A)
Norepinephrine
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B)
Acetylcholine
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C)
GABA
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D)
Dopamine
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A person is having problems with calcium and phosphorus metabolism in his body. Which one of the following glands may not be functioning properly?
A)
Thyroid
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B)
Parathyroid
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C)
Parotid
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D)
Pancreas
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In angiosperm all the four microspores of tetrad are covered by a layer which is formed by:
A)
Pectocellulose
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B)
Callose
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C)
Cellulose
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D)
Sporopollenin
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Male gametes in angiosperms are formed by the division of:
A)
Microspore mother cell
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B)
Microspore
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C)
Generative cell
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D)
Vegetative cell
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Which of the following is the correct matching of the events occurring during menstrual cycle?
A)
Menstruation \[\times \] Breakdown of myometrium and ovum not fertilized
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B)
Ovulation \[\times \] LH and FSH attain peak level and sharp fall in the secretion of progesterone
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C)
Proliferative phase \[\times \] Rapid regeneration of myometrium and maturation of Graa- fian follicle
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D)
Development of corpus \[\times \] Secretory phase and increased secretion of progesterone. Luteum
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The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for:
A)
providing a secondary sexual feature for exhibiting the male sex
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B)
maintaining the scrotal temperature lower than the internal body temperature
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C)
escaping any possible compression by the visceral organs
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D)
providing more space for the growth of Epididymis
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Medical Termination of Pregnancy (MTP) is considered safe up to how many weeks of pregnancy?
A)
Six weeks
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B)
Eight weeks
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C)
Twelve weeks
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D)
Eighteen weeks
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One of the legal methods of birth control is:
A)
abortion by taking an appropriate medicine
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B)
by abstaining from coitus from day 10 to 17 of the menstrual cycle
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C)
by having coitus at the time of day break
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D)
by a premature ejaculation during coitus
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Forecoming generations are less adaptive than their parental generation due to:
A)
Natural selection
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B)
Mutation
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C)
Genetic drift
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D)
Adaptation
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Which of the following is the example of sex- linked disease?
A)
AIDS
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B)
Colour-blindness
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C)
Syphilis
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D)
Gonorrhoea
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m-RNA is synthesised on DNA template in which direction:
A)
\[5'\to 3'\]
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B)
\[3'\to 5'\]
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C)
Both
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D)
Any
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Transformation experiment was first performed on which bacteria:
A)
E. coli
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B)
Diplococcus pneumoniae
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C)
Salmonella
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D)
Pasteurella pestis
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Which of the following is important for speciation?
A)
Seasonal isolation
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B)
Reproductive isolation
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C)
Behavioural isolation
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D)
Tropical isolation
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Age of fossils in the past was generally determined by radiocarbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms includes
A)
Study of the conditions of fossilization
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B)
Electron spin resonance (ESR) and fossil DNA
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C)
Study of carbohydrates/proteins in rocks
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D)
Study of carbohydrates/proteins in fossils
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Cancerous cells can easily be destroyed by radiations due to:
A)
rapid cell division
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B)
lack of nutrition
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C)
fast mutation
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D)
lack of oxygen
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Match the disease in Column I with the appropriate items (pathogen / prevention / treatment) in Column II.
Column I Column II [a] Amoebiasis (i) Treponemapallidum [b] Diphtheria (ii) Use only sterilized food and water [c] Cholera (iii) DPT Vaccine [d] Syphilis (iv) Use oral rehydration therapy
A)
A = (ii), B = (i), C = (iii), D = (iv)
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B)
A = (ii), B = (iii), C = (iv), D = (i)
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C)
A = (i), B = (ii), C = (iii), D = (iv)
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D)
A = (ii), B = (iv), C = (i), D = (iii)
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Which of the following crops have been brought to India from New World?
A)
Cashew nut, potato, rubber
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B)
Mango, tea
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C)
Tea, rubber, mango
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D)
Coffee
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Parthenocarpic tomato fruits can be produced by
A)
Removing androecium of flowers before pollen grains are released
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B)
Treating the plants with low concentrations of gibberellic acid and auxins
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C)
Raising the plants from vernalized seeds
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D)
Treating the plants with phenylmercuric acetate
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Which of the following is true pair of biofertil- izers?
A)
Azolla and BGA
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B)
Nostoc and legume
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C)
Rhizobium and grasses
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D)
Salmonella and E. coli
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A common biocontrol agent for the control of plant diseases is
A)
Baculovirus
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B)
Bacillusthuringiensis
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C)
Glomus
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D)
Trichoderma
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Introduction of food plants developed by genetic engineering is not desirable because:
A)
Economy of developing countries may suffer
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B)
These products are less tasty as compared to the already existing products
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C)
This method is costly
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D)
There is danger of coming viruses, allergens and toxins with introduced crop
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Which one of the following is used as vector for cloning genes into higher organisms?
A)
Baculovirus
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B)
Salmonella typhimurium
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C)
Rhizopus nigricans
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D)
Retrovirus
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Which of the following is expected to have the highest value (gm/m /yr) in a grassland ecosystem?
A)
Tertiary production
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B)
Gross production (GP)
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C)
Net production (NP)
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D)
Secondary production
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A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this?
(i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (ii) The area was sprayed with DDT by an aircraft (iii) The lake water turned green and stinky (iv) Phytoplankton populations in the lake declined initially, thereby greatly reducing photosynthesis
Which two of the above were the main causes offish mortality in the lake?
A)
(i),(iii)
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B)
(i), (ii)
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C)
(ii),(iii)
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D)
(iii),(iv)
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Identify the possible link "A" in the following food chain: Plant®in sec t®frog®"A"®Eagle
A)
Cobra
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B)
Parrot
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C)
Rabbit
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D)
Wolf
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At which latitude, heat gain through insolation approximately equals heat loss through terrestrial radiation
A)
42 \[1/{{2}^{o}}\]North and South
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B)
22 \[1/{{2}^{o}}\]North and South
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C)
\[{{40}^{o}}\]North and South
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D)
\[{{66}^{o}}\]North and South
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Quercus species are the dominant component in:
A)
Scrub forests
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B)
Tropical rain forests
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C)
Temperate deciduous forests
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D)
Alpine forests
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Which of the following represent maximum number of species among global biodiversity?
A)
Algae
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B)
Lichens
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C)
Fungi
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D)
Mosses and ferns
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In 1984, the Bhopal gas tragedy took place because methyl isocyanate:
A)
Reacted with ammonia
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B)
Reacted with \[C{{O}_{2}}\]
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C)
Reacted with water
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D)
Reacted with DDT
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Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year
A)
1986
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B)
1987
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C)
1988
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D)
1985
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World Summit on Sustainable Development (2002) was held in:
A)
Argentina
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B)
South Africa
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C)
Brazil
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D)
Sweden
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Which one of the following is commonly used in the transfer of foreign DNA into crop plants?
A)
Penicillium expansum
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B)
Trichoderma harzianum
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C)
Meloidogyne incognita
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D)
Agrobacterium tumefaciens
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The population of an insect species shows an explosive increase in numbers during rainy season followed by its disappearance at the end of the season. What does this show?
A)
The population of its predators increases enormously
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B)
S-shaped or sigmoid growth of this insect
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C)
The food plants mature and die at the end of the rainy season
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D)
Its population growth curve is of J-type
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