When a metal surface is illuminated by light of wavelengths 400 nm and 250 nm, the maximum velocities of the photoelectrons ejected are \[\upsilon \] and \[2\upsilon \] respectively. The work function of the metal is (h = Planck's constant, c = velocity of light in air)
A)
\[2\,\,hc\times {{10}^{6}}J\]
done
clear
B)
\[1.5\,\,hc\times {{10}^{6}}J\]
done
clear
C)
\[hc\times {{10}^{6}}J\]
done
clear
D)
\[0.5\,\,hc\times {{10}^{6}}J\]
done
clear
View Answer play_arrow
An electron (mass \[=9\times {{10}^{-31}}kg,\] charge\[=1.6\times {{10}^{-19}}C\]) moving with a velocity of \[{{10}^{6}}m/s\]enters a magnetic field. If it describes a circle of radius 0.1m, then strength of magnetic field must be
A)
\[4.5\times {{10}^{-5}}T\]
done
clear
B)
\[1.4\times {{10}^{-5}}T\]
done
clear
C)
\[5.5\times {{10}^{-5}}T\]
done
clear
D)
\[2.6\times {{10}^{-5}}T\]
done
clear
View Answer play_arrow
Figure shows a circuit in which three identical diodes are used. Each diode has forward resistance of \[20\,\,\Omega \] and infinite backward resistance. Resistors\[={{R}_{1}}={{R}_{2}}=50\Omega .\]Battery voltage is 6 V. The current through \[{{R}_{3}}\] is :
A)
50 mA
done
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B)
100 mA
done
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C)
60 mA
done
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D)
25 mA
done
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View Answer play_arrow
When an electron jumps from the fourth orbit to the second orbit, one gets the
A)
second line of Lyman series
done
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B)
second line of Paschen series
done
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C)
second line of Balmer series
done
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D)
first line of P fund series
done
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View Answer play_arrow
In a two dimensional motion, instantaneous speed \[{{v}_{0}}\] is a positive constant. Then which of the following is necessarily true?
A)
The average velocity is not zero at any time
done
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B)
Average acceleration must always vanish
done
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C)
Displacements in equal time intervals are equal
done
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D)
Equal plane lengths are traversed in equal Intervals
done
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View Answer play_arrow
A ball of mass 150 g, moving with an acceleration \[20\,m/{{s}^{2}},\]is hit by a force, which acts on it for 0.1 sec. The impulsive force is
A)
0.5 N
done
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B)
0.1 N
done
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C)
0.3 N
done
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D)
1.2 N
done
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View Answer play_arrow
A man is watching two trains, one leaving and the other coming with equal speed of 4 m/s. If they sound their whistles each of frequency 240 Hz, the number of beats heard by man (velocity of sound in air = 320 m/s) will be equal to
A)
12
done
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B)
0
done
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C)
3
done
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D)
6
done
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View Answer play_arrow
Two identical galvanometers are taken, one is to be converted into an ammeter and other into a milliammeter. Shunt of milliammeter compared to ammeter is
A)
less
done
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B)
more
done
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C)
zero
done
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D)
None of these
done
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View Answer play_arrow
In a compound microscope, the intermediate image is
A)
virtual, erect and magnified
done
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B)
real, erect and magnified
done
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C)
real, inverted and magnified
done
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D)
virtual, erect and reduced
done
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View Answer play_arrow
Let \[{{E}_{a}}\] be the electric field due to a dipole in its axial plane distant \[\ell \] and \[{{E}_{q}}\] be the field in the equatorial plane distant \[\ell ',\] then the relation between \[{{E}_{a}}\] and \[{{E}_{q}}\] will be
A)
\[{{E}_{a}}=4{{E}_{q}}\]
done
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B)
\[{{E}_{q}}=2{{E}_{a}}\]
done
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C)
\[{{E}_{a}}=2{{E}_{q}}\]
done
clear
D)
\[{{E}_{q}}=3{{E}_{a}}\]
done
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View Answer play_arrow
A combination of capacitors is set up as shown in the figure. The magnitude of the electric field, due to a point charge Q (having a charge equal to the sum of the charges on the 4 \[\mu \] F and 9 \[\mu \] F capacitors), at a point distance 30m from it, would equal:
A)
420 N/C
done
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B)
480 N/C
done
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C)
240 N/C
done
clear
D)
360 N/C
done
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View Answer play_arrow
The moment of inertia of a disc of mass m and radius r about an axis, which is tangential to the circumference of the disc and parallel to its diameter is
A)
\[\frac{3}{2}m\,{{r}^{2}}\]
done
clear
B)
\[\frac{2}{3}m\,{{r}^{2}}\]
done
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C)
\[\frac{5}{4}m\,{{r}^{2}}\]
done
clear
D)
\[\frac{4}{5}m\,{{r}^{2}}\]
done
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View Answer play_arrow
A sphere of radius R has uniform volume charge density. The electric potential at a point \[(r<R)\] is
A)
due to the charge inside a sphere of radius r only
done
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B)
due to the entire charge of the sphere
done
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C)
due to the charge in the spherical shell of inner and outer radii r and R, only
done
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D)
independent of r
done
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View Answer play_arrow
A convex lens of focal length 40 cm is held co- axially 12 cm above a mirror of focal length 18 cm. An object held x cm above the lens gives rise to an image coincident with it. Then x is equal to:
A)
12 cm
done
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B)
15 cm
done
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C)
18 cm
done
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D)
30 cm
done
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View Answer play_arrow
A body of mass 3 kg is under a constant force which causes a displacement s in meter in it, given by the relation \[s=\frac{1}{3}{{t}^{2}},\] where t is in second. Work done by the force in 2 second is
A)
\[\frac{3}{8}J\]
done
clear
B)
\[\frac{8}{3}J\]
done
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C)
\[\frac{19}{5}J\]
done
clear
D)
\[\frac{5}{19}J\]
done
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View Answer play_arrow
Under a constant torque the angular momentum of a body changes from A to 4A in 4 second. The torque on the body will be
A)
\[1\,A\]
done
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B)
\[\frac{1}{4}A\]
done
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C)
\[\frac{4}{3}A\]
done
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D)
\[\frac{3}{4}A\]
done
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View Answer play_arrow
An electric bulb marked 40 W and 200V, is used in a circuit of supply voltage 100V. Now its power is
A)
10 W
done
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B)
20 W
done
clear
C)
40 W
done
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D)
100 W
done
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View Answer play_arrow
The height at which the acceleration due to gravity becomes \[\frac{g}{9}\] (where g = the acceleration due to gravity on the surface of the earth) in terms of R, the radius of the earth, is
A)
\[\frac{R}{\sqrt{2}}\]
done
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B)
\[R/2\]
done
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C)
\[\sqrt{2}R\]
done
clear
D)
\[2\,R\]
done
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View Answer play_arrow
Two coherent monochromatic light beams of intensities I and 4 I are superimposed. The maximum and minimum possible intensities in the resulting beam are
A)
5 I and I
done
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B)
5 I and 3 I
done
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C)
9 I and I
done
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D)
9 I and 3 I
done
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View Answer play_arrow
When a wave travels in a medium the particles displacement is given by the equation y = 0.03 \[\sin \,\pi (2t-0.01x),\] where x and y are in seconds. The wavelength of the wave is
A)
200 m
done
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B)
100 m
done
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C)
20 m
done
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D)
10 m
done
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View Answer play_arrow
Figure shows a parallel plate capacitor and the current in the connecting wires that is discharging the capacitor.
A)
The displacement current is leftward.
done
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B)
The displacement current is rightward
done
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C)
The electric field \[\overrightarrow{E}\] is rightward
done
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D)
The magnetic field at point P is out the page.
done
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View Answer play_arrow
The specific heat capacity of a metal at low temperature (T) is given as\[{{C}_{p}}(kJ{{K}^{-1}}k{{g}^{-1}})=32{{\left( \frac{T}{400} \right)}^{3}}.\] A 100 g vessel of this metal is to be cooled from 20 K to 4 K by a special refrigerator operating at room temperature\[\left( 27{}^\circ C \right).\] The amount of work required to cool in vessel is
A)
equal to 0.002 kJ
done
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B)
greater than 0.148 kJ
done
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C)
between 0.148 KJ and 0.028 kJ
done
clear
D)
less than 0.028 KJ
done
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View Answer play_arrow
Solar radiation emitted by sun resembles that emitted by a black body at a temperature of 6000 K. Maximum intensity is emitted at a wavelength of about 4800 \[\overset{{}^\circ }{\mathop{A.}}\,\] If the sun were to cool down from 6000 K to 3000K, then the peak intensity would occur at a wavelength
A)
\[4800\overset{{}^\circ }{\mathop{A}}\,\]
done
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B)
\[9600\overset{{}^\circ }{\mathop{A}}\,\]
done
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C)
\[7200\overset{{}^\circ }{\mathop{A}}\,\]
done
clear
D)
\[6400\overset{{}^\circ }{\mathop{A}}\,\]
done
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View Answer play_arrow
Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is
A)
\[0\]
done
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B)
\[2\pi /3\]
done
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C)
\[\pi \]
done
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D)
\[\pi /6\]
done
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View Answer play_arrow
A particle of mass 10 g is kept on the surface of a uniform sphere of mass 100 kg and radius 10 cm. Find the work to be done against the gravitational force between them to take the particle far away from the sphere (Take \[G=6.67\times {{10}^{-11}}N{{m}^{2}}/k{{g}^{2}}\])
A)
\[3.33\times {{10}^{-10}}J\]
done
clear
B)
\[13.34\times {{10}^{-10}}J\]
done
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C)
\[6.67\times {{10}^{-10}}J\]
done
clear
D)
\[6.67\times {{10}^{-9}}J\]
done
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View Answer play_arrow
What is the acceleration of a projectile at its highest point
A)
maximum
done
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B)
minimum
done
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C)
zero
done
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D)
g
done
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View Answer play_arrow
A particle is moving in a circle of radius r under the action of a force \[F=\alpha {{r}^{2}}\] which is directed towards centre of the circle. Total mechanical energy (kinetic energy + potential energy) of the particle is (take potential energy = 0 for r = 0):
A)
\[\frac{1}{2}\alpha {{r}^{3}}\]
done
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B)
\[\frac{5}{6}\alpha {{r}^{3}}\]
done
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C)
\[\frac{4}{3}\alpha {{r}^{3}}\]
done
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D)
\[\alpha {{r}^{3}}\]
done
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View Answer play_arrow
A block A of mass 7 kg is placed on a frictionless table. A thread tied to it passes over a frictionless pulley and carries a body B of mass 3 kg at the other end. The acceleration of the system is (given\[g=10\,\,m{{s}^{-2}}\])
A)
\[100\,m{{s}^{-2}}\]
done
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B)
\[3\,m{{s}^{-2}}\]
done
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C)
\[10\,m{{s}^{-2}}\]
done
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D)
\[30\,m{{s}^{-2}}\]
done
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View Answer play_arrow
The kinetic theory of gases
A)
explains the behaviour of an ideal gas
done
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B)
describes the motion of a single atom or molecule
done
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C)
relates the temperature of the gas with K.E. of atoms of the gas
done
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D)
all of the above
done
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View Answer play_arrow
A uniform magnetic field acts at right angles to the direction of motion of electron. As a result, the electron moves in a circular path of radius 2 cm. If the speed of electron is doubled, then the radius of the circular path will be
A)
2.0 on
done
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B)
0.5cm
done
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C)
4.0 cm
done
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D)
1.0cm
done
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View Answer play_arrow
A photoelectric cell is illuminated by a point source of light 1 m away. When the source is shifted to 2 m, then
A)
number of electrons emitted is a quarter of the initial number
done
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B)
each emitted electron carries one quarter of the initial energy
done
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C)
number of electrons emitted is half the initial number
done
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D)
each emitted electron carries half the initial energy
done
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View Answer play_arrow
An engine has an efficiency of 1/6. When the temperature of sink is reduced by \[62{}^\circ C,\] its efficiency is doubled. Temperature of the source is
A)
\[37{}^\circ C\]
done
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B)
\[62{}^\circ C\]
done
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C)
\[99{}^\circ C\]
done
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D)
\[124{}^\circ C\]
done
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View Answer play_arrow
Two point dipoles of dipole moment \[{{\overrightarrow{p}}_{1}}\] and \[{{\overrightarrow{p}}_{2}}\] are at a distances from each other and \[{{\overrightarrow{p}}_{1}}||{{\overrightarrow{p}}_{2}}.\] The force between the dipoles is:
A)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{4{{p}_{1}}{{p}_{2}}}{{{x}^{4}}}\]
done
clear
B)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{3{{p}_{1}}{{p}_{2}}}{{{x}^{3}}}\]
done
clear
C)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{6{{p}_{1}}{{p}_{2}}}{{{x}^{4}}}\]
done
clear
D)
\[\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{8{{p}_{1}}{{p}_{2}}}{{{x}^{4}}}\]
done
clear
View Answer play_arrow
The Bulk modulus for an incompressible liquid is
A)
zero
done
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B)
unity
done
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C)
infinity
done
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D)
between 0 and 1
done
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View Answer play_arrow
If unit of length and force are increased 4 times. The unit of energy
A)
is increased by 4 times
done
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B)
is increased by 16 times
done
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C)
is increased by 8 times
done
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D)
remains unchanged
done
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View Answer play_arrow
A particle starting from rest falls from a certain height. Assuming that the acceleration due to gravity remain the same throughout the motion, its displacements in three successive half second intervals are \[{{S}_{1}},\]\[{{S}_{2}}\] and \[{{S}_{3}}\] then
A)
\[{{S}_{1}}:{{S}_{2}}:{{S}_{3}}=1:5:9\]
done
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B)
\[{{S}_{1}}:{{S}_{2}}:{{S}_{3}}=1:3:5\]
done
clear
C)
\[{{S}_{1}}:{{S}_{2}}:{{S}_{3}}=9:2:3\]
done
clear
D)
\[{{S}_{1}}:{{S}_{2}}:{{S}_{3}}=1:1:1\]
done
clear
View Answer play_arrow
A mass of 2kg is whirled in a horizontal circle by means of a string at initial speed of 5 revolution per minute. Keeping the radius constant, the tension in the string is doubled. The new speed is nearly
A)
2.25 rpm
done
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B)
7 rpm
done
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C)
10 rpm
done
clear
D)
14 rpm
done
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View Answer play_arrow
A transformer is employed to
A)
convert A.C. into D.C.
done
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B)
convert D.C. into A.C.
done
clear
C)
obtain a suitable A.C. voltage
done
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D)
obtain a suitable D.C. voltage
done
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View Answer play_arrow
A car runs at a constant speed on a circular track of radius 100 m, taking 62.8 seconds in every circular loop. The average velocity and average speed for each circular loop respectively, is
A)
0, 10 m/s
done
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B)
10 m/s, 10 m/s
done
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C)
10 m/s, 0
done
clear
D)
0, 0
done
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View Answer play_arrow
In the circuit shown, the internal resistance of the cell is negligible. The steady state current in the \[2\Omega \] resistor is
A)
0.6 A
done
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B)
0.9 A
done
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C)
1.2 A
done
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D)
1.5 A
done
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View Answer play_arrow
A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency\[\omega .\] The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first time
A)
at the mean position of the platform
done
clear
B)
for an amplitude of \[\frac{g}{{{\omega }^{2}}}\]
done
clear
C)
for an amplitude of \[\frac{{{g}^{2}}}{{{\omega }^{2}}}\]
done
clear
D)
at the highest position of the platform
done
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View Answer play_arrow
A mass m is suspended from a spring of force constant k and just touches another identical spring fixed to the floor as shown in the figure. The time period of small oscillations is
A)
\[2\pi \sqrt{\frac{m}{k}}\]
done
clear
B)
\[\pi \sqrt{\frac{m}{k}}+\pi \sqrt{\frac{m}{k/2}}\]
done
clear
C)
\[\pi \sqrt{\frac{m}{3k/2}}\]
done
clear
D)
\[\pi \sqrt{\frac{m}{k}}+\pi \sqrt{\frac{m}{2k}}\]
done
clear
View Answer play_arrow
Two wires of same material and length but cross- sections in the ratio 1: 2 are used to suspend the same loads. The extensions in them will be in the ratio of
A)
1 : 2
done
clear
B)
2 : 1
done
clear
C)
4 : 1
done
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D)
1 : 4
done
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View Answer play_arrow
The meniscus of a liquid contained in one of the limbs of a narrow U-tube is held in an electromagnet with the meniscus in line with the field. The liquid is seen to rise. This indicates that the liquid is
A)
ferromagnetic
done
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B)
paramagnetic
done
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C)
diamagnetic
done
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D)
non-magnetic
done
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View Answer play_arrow
The coefficient of self-inductance of a solenoid is 0.18 mH. If a core of soft iron of relative permeability 900 is inserted, then the coefficient of self-inductance will become nearly.
A)
5.4 mH
done
clear
B)
162 mH
done
clear
C)
0.006 mH
done
clear
D)
0.0002 mH
done
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View Answer play_arrow
The values 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 nanometers of a quantum of light with frequency of \[8\times {{10}^{15}}{{s}^{-1}}?\]
A)
\[5\times {{10}^{-18}}\]
done
clear
B)
\[4\times {{10}^{1}}\]
done
clear
C)
\[3\times {{10}^{7}}\]
done
clear
D)
\[2\times {{10}^{-25}}\]
done
clear
View Answer play_arrow
Higher order (>3) reactions are rare due to:
A)
Shifting of equilibrium towards reactants due to elastic collisions.
done
clear
B)
Loss of active species on collision.
done
clear
C)
Low probability of simultaneous collision of all the reacting species.
done
clear
D)
Increase in entropy and activation energy as more molecules are involved.
done
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View Answer play_arrow
Which of the following order is wrong?
A)
\[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}\text{Acidic}\]
done
clear
B)
\[Li<Be<B<CI{{E}_{1}}\]
done
clear
C)
\[A{{l}_{2}}{{O}_{3}}<MgO<N{{a}_{2}}O<{{K}_{2}}O-\text{Basic}\]
done
clear
D)
\[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<C{{s}^{+}}-\text{Ionic}\,\,\text{radius}\]
done
clear
View Answer play_arrow
A compound of a metal ion \[{{M}^{x+}}(Z=24)\] has a spin only magnetic moment of \[\sqrt{15}\] Bohr Magnetons. The number of unpaired electrons in the compound are
A)
2
done
clear
B)
4
done
clear
C)
5
done
clear
D)
3
done
clear
View Answer play_arrow
In the following reaction sequence :
The compound I is:
A)
\[\underset{\underset{Cl}{\mathop{|}}\,}{\mathop{C{{H}_{2}}}}\,-\underset{\underset{Cl}{\mathop{|}}\,}{\mathop{CH}}\,-C{{H}_{3}}\]
done
clear
B)
\[\underset{\underset{Cl}{\mathop{|}}\,}{\mathop{C{{H}_{2}}}}\,-\underset{\underset{Cl}{\mathop{|}}\,}{\mathop{C{{H}_{2}}}}\,-C{{H}_{3}}\]
done
clear
C)
\[CH-\underset{\underset{Cl}{\mathop{|}}\,}{\mathop{CH}}\,-C{{H}_{2}}-C{{H}_{3}}\]
done
clear
D)
done
clear
View Answer play_arrow
In which of the following sets, all the given species are isostructural?
A)
\[C{{O}_{2}},\]\[N{{O}_{2}},\]\[Cl{{O}_{2}},\]\[Si{{O}_{2}}\]
done
clear
B)
\[PC{{l}_{3}},\]\[Al\,C{{l}_{3}},\]\[BC{{l}_{3}},\]\[SbC{{l}_{3}}\]
done
clear
C)
\[B{{F}_{3}},\]\[N{{F}_{3}},\]\[P{{F}_{3}},\]\[Al{{F}_{3}}\]
done
clear
D)
\[BF_{4}^{-},\]\[CC{{l}_{4}},\]\[NH_{4}^{+},\]\[PCl_{4}^{+}\]
done
clear
View Answer play_arrow
In the cyclic process shown in \[P-V\]diagram, the magnitude of the work done is :
A)
\[\pi {{\left( \frac{{{P}_{2}}-{{P}_{1}}}{2} \right)}^{2}}\]
done
clear
B)
\[\pi {{\left( \frac{{{V}_{2}}-{{V}_{1}}}{2} \right)}^{2}}\]
done
clear
C)
\[\frac{\pi }{4}({{P}_{2}}-{{P}_{1}})({{V}_{2}}-{{V}_{1}})\]
done
clear
D)
\[\pi ({{V}_{2}}-{{V}_{1}}^{2})\]
done
clear
View Answer play_arrow
On the basis of the information available from the reaction \[\frac{4}{3}Al+{{O}_{2}}\xrightarrow{{}}\frac{2}{3}A{{l}_{2}}{{O}_{3}},\]\[\Delta G=-827\,kJ\,mo{{l}^{-1}}\] of \[{{O}_{2}},\] the minimum e.m.f. required to carry out electrolysis of \[A{{l}_{2}}{{O}_{3}}\] is \[(F=96500\,C\,mo{{l}^{-1}})\]
A)
4.28 V
done
clear
B)
6.42 V
done
clear
C)
8.56 V
done
clear
D)
2.14 V
done
clear
View Answer play_arrow
Iron sulphide is heated in air to form A, an oxide of sulphur. A is dissolved in water to give an acid. The basicity of this acid is
A)
2
done
clear
B)
3
done
clear
C)
1
done
clear
D)
Zero
done
clear
View Answer play_arrow
Which of the following cannot be made by using Williamson's synthesis?
A)
Methoxybenzene
done
clear
B)
Benzyl-p-nitrophenyl ether
done
clear
C)
Methyl tertiary butyl ether
done
clear
D)
Di-tert-butyl ether
done
clear
View Answer play_arrow
Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure \[{{P}_{i}}\] and temperature \[{{T}_{1}}\] are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to \[{{T}_{2}}.\] The final pressures \[{{P}_{f}}\] is :
A)
\[2{{p}_{i}}\left( \frac{{{T}_{2}}}{{{T}_{1}}+{{T}_{2}}} \right)\]
done
clear
B)
\[2{{p}_{i}}\left( \frac{{{T}_{1}}{{T}_{2}}}{{{T}_{1}}+{{T}_{2}}} \right)\]
done
clear
C)
\[{{p}_{i}}\left( \frac{{{T}_{1}}{{T}_{2}}}{{{T}_{1}}+{{T}_{2}}} \right)\]
done
clear
D)
\[2{{p}_{i}}\left( \frac{{{T}_{1}}}{{{T}_{1}}+{{T}_{2}}} \right)\]
done
clear
View Answer play_arrow
Which of the following is an expression of Raoults law if \[{{P}_{A}}\] is the partial pressure of the solvent in a solution. \[{{P}^{0}}_{A}\] is the partial pressure of pure solvent and if \[{{X}_{A}}\] and \[{{X}_{B}}\] are the mole fraction of the solute and the solvent respectively?
A)
\[{{P}_{A}}=P_{A}^{O}{{x}_{A}}\]
done
clear
B)
\[{{P}_{A}}=P_{A}^{O}{{x}_{A}}\left( \frac{1}{{{x}_{B}}} \right)\]
done
clear
C)
\[{{P}_{A}}=P_{A}^{O}{{x}_{B}}\]
done
clear
D)
\[P_{A}^{O}=P\left( \frac{{{x}_{A}}}{{{x}_{B}}} \right)\]
done
clear
View Answer play_arrow
Standard potentials \[\left( E{}^\circ \right)\] for some half-reactions are given below: (I) \[S{{n}^{4+}}+2e\xrightarrow{{}}S{{n}^{2+}};\]\[{{E}^{o}}=+0.15V\] (II) \[2H{{g}^{2+}}+2e\xrightarrow{{}}Hg_{2}^{2+};\]\[{{E}^{o}}=0.92V\] (III) \[Pb{{O}_{2}}+4{{H}^{+}}+2e\xrightarrow{{}}P{{b}^{2+}}+2{{H}_{2}}O;\]\[{{E}^{o}}=+1.45V\] based on the above, which one of the following statements is correct?
A)
\[S{{n}^{4+}}\] is a stronger oxidising agent than \[P{{b}^{4+}}\]
done
clear
B)
\[S{{n}^{2+}}\] is a stronger reducing agent than \[H{{g}_{2}}^{2+}\]
done
clear
C)
\[P{{b}^{2+}}\] is a stronger oxidisng agent than \[P{{b}^{4+}}\]
done
clear
D)
\[P{{b}^{2+}}\] is a stronger reducing agent than \[S{{n}^{2+}}\]
done
clear
View Answer play_arrow
Match the columns
Column-I Column-II [A] Compound formed when yellow \[CrO_{4}^{2-}\] acidified. (p) Acidified \[MnO_{4}^{-}\] [B] Reagent oxidises \[F{{e}^{2+}}\]to \[F{{e}^{3+}}.\] (q) \[C{{r}_{2}}O_{7}^{2-}\] [C] Compound produced when \[Mn{{O}_{2}}\] is fused with \[KN{{O}_{3}}.\] (r) \[{{K}_{2}}Mn{{O}_{4}}\] [D] Compound having dark purple crystals isostructural with \[KCl{{O}_{4}}.\] (s) \[KMn{{O}_{4}}\]
A)
A\[\to \](q), B\[\to \](p), C\[\to \](r), D\[\to \](s)
done
clear
B)
A\[\to \](p), B\[\to \](q), C\[\to \](r), D\[\to \](s)
done
clear
C)
A\[\to \](q), B\[\to \](r), C\[\to \](p), D\[\to \](s)
done
clear
D)
A\[\to \](q), B\[\to \](p), C\[\to \](s), D\[\to \](r)
done
clear
View Answer play_arrow
Phenol on reaction with \[B{{r}_{2}}\] in non-polar aprotic solvent furnishes
A)
2, 4, 6-Tribromophenol
done
clear
B)
p-Bromophenol
done
clear
C)
o-and p-Bromophenol
done
clear
D)
m-Bromophenol
done
clear
View Answer play_arrow
(1) \[{{N}_{2}}(g)+3{{H}_{2}}(g)2N{{H}_{3}}(g),\]\[{{K}_{1}}\] (2) \[{{N}_{2}}\left( g \right)+{{O}_{2}}\left( g \right)2NO\left( g \right),\]\[{{K}_{2}}\] (3) \[{{H}_{2}}(g)+\frac{1}{2}{{O}_{2}}(g){{H}_{2}}O(g),\]\[{{K}_{3}}\] The equation for the equilibrium constant of the reaction \[2N{{H}_{3}}(g)+\frac{5}{2}{{O}_{2}}(g)2NO(g)+3{{H}_{2}}O(g),\] \[({{K}_{4}})\] in terms of \[{{K}_{1}},\]\[{{K}_{2}}\] and \[{{K}_{3}}\] is:
A)
\[\frac{{{K}_{1}}.{{K}_{2}}}{{{K}_{3}}}\]
done
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B)
\[\frac{{{K}_{1}}.K_{3}^{2}}{{{K}_{2}}}\]
done
clear
C)
\[{{K}_{1}}{{K}_{2}}{{K}_{3}}\]
done
clear
D)
\[\frac{{{K}_{2}}.K_{3}^{3}}{{{K}_{1}}}\]
done
clear
View Answer play_arrow
A metallic crystal crystallizes into a lattice containing a sequence of layers AB AB AB......Any packing of spheres leaves out voids in the lattice. What percentage of volume of this lattice is empty space?
A)
74%
done
clear
B)
26%
done
clear
C)
50%
done
clear
D)
none of these.
done
clear
View Answer play_arrow
Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts \[H{{g}_{2}}C{{l}_{2}},C{{r}_{2}}{{(S{{O}_{4}})}_{3}},\]\[BaS{{O}_{4}}\]and \[CrC{{l}_{3}}\] respectively?
A)
\[BaS{{O}_{4}}>H{{g}_{2}}C{{l}_{2}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}>CrC{{l}_{3}}\]
done
clear
B)
\[BaS{{O}_{4}}>H{{g}_{2}}C{{l}_{2}}>CrC{{l}_{3}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
done
clear
C)
\[BaS{{O}_{4}}>CrC{{l}_{3}}>H{{g}_{2}}C{{l}_{2}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
done
clear
D)
\[H{{g}_{2}}C{{l}_{2}}>BaS{{O}_{4}}>CrC{{l}_{3}}>C{{r}_{2}}{{(S{{O}_{4}})}_{3}}\]
done
clear
View Answer play_arrow
Which among the following factors is the most important in making fluorine the strongest oxidizing halogen?
A)
Hydration enthalpy
done
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B)
Ionization enthalpy
done
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C)
Electron affinity
done
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D)
Bond dissociation energy
done
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View Answer play_arrow
\[\alpha \]-D-Glucose and \[\beta \]-D-glucose differ from each other due to difference in one carbon with respect to its:
A)
Size of hemiacetal ring
done
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B)
Number of OH groups
done
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C)
Configuration
done
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D)
Conformation
done
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View Answer play_arrow
Identify the incorrect statement:
A)
The S-S-S bond angles in the \[{{S}_{8}}\] and \[{{S}_{6}}\] rings are the same.
done
clear
B)
Rhombic and monoclinic sulphur have \[{{S}_{8}}\] molecules.
done
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C)
\[{{S}_{2}}\] is paramagnetic like oxygen
done
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D)
\[{{S}_{8}}\] ring has a crown shape.
done
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View Answer play_arrow
In which of the following Tyndall effect is not observed?
A)
Suspensions
done
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B)
Emulsions
done
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C)
Sugar solution
done
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D)
Gold sol
done
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View Answer play_arrow
The most electropositive metals are isolated from their ores by:
A)
High temperature reduction with carbon.
done
clear
B)
Self reduction.
done
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C)
Thermal decomposition.
done
clear
D)
Electrolysis of fused ionic salts.
done
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View Answer play_arrow
The hypothetical complex chloro diaquatri- amminecobalt (III) chloride can be represented as
A)
\[[CoCl{{(N{{H}_{3}})}_{3}}{{({{H}_{2}}O)}_{2}}]C{{l}_{2}}\]
done
clear
B)
\[[Co{{\left( N{{H}_{3}} \right)}_{3}}\left( {{H}_{2}}O \right)C{{l}_{3}}]\]
done
clear
C)
\[[Co{{\left( N{{H}_{3}} \right)}_{3}}{{\left( {{H}_{2}}O \right)}_{2}}Cl]\]
done
clear
D)
\[[Co{{\left( N{{H}_{3}} \right)}_{3}}{{\left( {{H}_{2}}O \right)}_{3}}]C{{l}_{3}}\]
done
clear
View Answer play_arrow
Which of the following is not correctly matched?
A)
done
clear
B)
done
clear
C)
done
clear
D)
done
clear
View Answer play_arrow
Consider the following ionization enthalpies of two elements 'A' and 'B'.
Element Ionization Enthalpy (KJ/mol) 1st 2nd 3rd A 899 1757 14847 B 737 1450 7731
Which of the following statements is correct?
A)
Both ?A? and ?B? belong to group-1 where ?B? comes below ?A?.
done
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B)
Both ?A? and ?B? belong to group-1 where ?A? comes below ?B?.
done
clear
C)
Both ?A' and ?B? belong to group-2 where ?B? comes below ?A?.
done
clear
D)
Both ?A? and ?B? belong to group-2 where ?A? comes below ?B?.
done
clear
View Answer play_arrow
The pH of a solution is increased from 3 to 6; its \[{{H}^{+}}\]ion concentration will be
A)
reduced to half
done
clear
B)
doubled
done
clear
C)
reduced by 1000 times
done
clear
D)
increased by 1000 times
done
clear
View Answer play_arrow
The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because
A)
There is an increase in the nuclear charge of the alkaline earth metals
done
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B)
There is a decrease in the nuclear charge of the alkaline earth metals
done
clear
C)
There is no change in the nuclear charge
done
clear
D)
None of the above
done
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View Answer play_arrow
Identify the statement that is not correct as far as structure of diborane is concerned
A)
There are two bridging hydrogen atoms and four terminal hydrogen atoms in diborane
done
clear
B)
Each boron atom forms four bonds in diborane
done
clear
C)
The hydrogen atoms are not in the same plane in diborane
done
clear
D)
All, B - H bonds in diborane are similar
done
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View Answer play_arrow
The correct order of increasing acid strength of the compounds [A] \[C{{H}_{3}}C{{O}_{2}}H\] [B] \[MeOC{{H}_{2}}C{{O}_{2}}H\] [C] \[C{{F}_{3}}C{{O}_{2}}H\]
A)
\[D<A<B<C\]
done
clear
B)
\[A<D<B<C\]
done
clear
C)
\[B<D<A<C\]
done
clear
D)
\[D<A<C<B\]
done
clear
View Answer play_arrow
Hydrogen peroxide acts both as an oxidizing and as a reducing agent depending upon the nature of the reacting species. In which of the following cases \[{{H}_{2}}{{O}_{2}}\] acts as a reducing agent in acid medium?
A)
\[MnO_{4}^{-}\]
done
clear
B)
(b)\[C{{r}_{2}}O_{7}^{2-}\]
done
clear
C)
\[SO_{3}^{2-}\]
done
clear
D)
\[KI\]
done
clear
View Answer play_arrow
The enthalpy of formation for \[{{C}_{2}}{{H}_{4}}(g)C{{O}_{2}}(g)\] and \[{{H}_{2}}O(1)\] at \[25{}^\circ C\] and 1 atm pressure are 52, \[-394\] and \[-286\,kJ\,mo{{l}^{-1}}\] respectively The enthalpy of combustion of \[{{C}_{2}}{{H}_{4}}(g)\] will be
A)
\[+1412\,kJ\,mo{{l}^{-1}}\]
done
clear
B)
\[-1412\,kJ\,mo{{l}^{-1}}\]
done
clear
C)
\[141.2\,kJ\,mo{{l}^{-1}}\]
done
clear
D)
\[-141.2\,kJ\,mo{{l}^{-1}}\]
done
clear
View Answer play_arrow
Consider the following standard electrode potentials (\[E{}^\circ \]in volts) in aqueous solution:
Element \[{{M}^{3+}}/M\] \[{{M}^{+}}/M\] Al \[-1.66\] \[+0.55\] TI \[+1.26\] \[-0.34\]
Based on these data, which of the following statements is correct?
A)
\[T{{l}^{+}}\] is more stable than \[A{{l}^{3+}}\]
done
clear
B)
\[A{{l}^{+}}\] is more stable than \[A{{l}^{3+}}\]
done
clear
C)
\[T{{l}^{+}}\] is more stable than \[A{{l}^{+}}\]
done
clear
D)
\[T{{l}^{3+}}\] is more stable than \[A{{l}^{3+}}\]
done
clear
View Answer play_arrow
Ozone is an important constituent of stratosphere because it:
A)
Destroys bacteria which are harmful to human life.
done
clear
B)
Prevents the formation of smog over large cities.
done
clear
C)
Removes poisonous gases of the atmosphere by reacting with them.
done
clear
D)
Absorbs ultraviolet radiation which is harmful to human life.
done
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View Answer play_arrow
Which of the following products is formed when benzaldehyde is treated with \[C{{H}_{3}}MgBr\] and the addition product so obtained is subjected to acid hydrolysis?
A)
A secondary alcohol
done
clear
B)
A primary alcohol
done
clear
C)
Phenol
done
clear
D)
tert-Butyl alcohol
done
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View Answer play_arrow
In which of the following pairs, there is greatest difference in the oxidation number of the underlined elements?
A)
\[\underline{N}{{O}_{2}}\] and \[{{\underline{N}}_{2}}{{O}_{4}}\]
done
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B)
\[{{\underline{P}}_{2}}{{O}_{5}}\] and \[{{\underline{P}}_{4}}{{O}_{10}}\]
done
clear
C)
\[{{\underline{N}}_{2}}O\] and \[\underline{N}O\]
done
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D)
\[\underline{S}{{O}_{2}}\] and \[\underline{S}{{O}_{3}}\]
done
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View Answer play_arrow
The boiling point of a solution of 0.11 g of a substance in 15 g of ether was found to be \[0.1{}^\circ C\] higher than that of pure ether. The molecular weight of the substance will be \[({{K}_{b}}=2.16\,K\,kg\,mo{{l}^{-1}})\]
A)
\[148\,g\,mo{{l}^{-1}}\]
done
clear
B)
\[158\,g\,mo{{l}^{-1}}\]
done
clear
C)
\[168\,g\,mo{{l}^{-1}}\]
done
clear
D)
\[178\,g\,mo{{l}^{-1}}\]
done
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View Answer play_arrow
Which one of the following is an example of homogeneous catalysis?
A)
Haber's process of synthesis of ammonia
done
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B)
Catalytic conversion of \[S{{O}_{2}}\]to \[S{{O}_{3}}\] in contact process
done
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C)
Catalytic hydrogenation of oils
done
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D)
Acid hydrolysis of methyl acetate
done
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View Answer play_arrow
The decomposition of a substance follows first order kinetics. Its concentration is reduced to 1/ 8th of its initial value in 24 minutes. The rate constant of the decomposition process is
A)
\[{1}/{24\,{{\min }^{-1}}}\;\]
done
clear
B)
\[\frac{0.692}{24}\,{{\min }^{-1}}\]
done
clear
C)
\[\frac{2.303}{24}\,\log \,\left( \frac{1}{8} \right)\,{{\min }^{-1}}\]
done
clear
D)
\[\frac{2.303}{24}\,\log \,\left( \frac{8}{1} \right)\,{{\min }^{-1}}\]
done
clear
View Answer play_arrow
The electronic configuration of elements A, B and C are \[[He]2{{s}^{1}},\] \[[Ne]3{{s}^{1}}\] and \[[Ar]4{{s}^{1}}\] respectively. Which one of the following order is correct for \[I{{E}_{1}}(in\,kJ\,mo{{l}^{-1}})\]of A, B and C?
A)
\[A>B>C\]
done
clear
B)
\[C>B>A\]
done
clear
C)
\[B>C>A\]
done
clear
D)
\[C>A>B\]
done
clear
View Answer play_arrow
An element (X) forms compounds of the formula \[XC{{l}_{3}},\] \[{{X}_{2}}{{O}_{5}}\] and \[C{{a}_{3}}{{X}_{2}}\] but does not form \[XC{{l}_{5}}.\] Which of the following is the element X?
A)
B
done
clear
B)
Al
done
clear
C)
N
done
clear
D)
P
done
clear
View Answer play_arrow
Which metal is present in brass, bronze and German silver?
A)
Zn
done
clear
B)
Mg
done
clear
C)
Cu
done
clear
D)
Al
done
clear
View Answer play_arrow
Both geometrical and optical isomerisms are shown by
A)
\[{{[Co{{(en)}_{2}}C{{l}_{2}}]}^{+}}\]
done
clear
B)
\[{{[Co{{(N{{H}_{3}})}_{5}}Cl]}^{2+}}\]
done
clear
C)
\[{{[Co{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]}^{+}}\]
done
clear
D)
\[{{[Cr{{(ox)}_{3}}]}^{3-}}\]
done
clear
View Answer play_arrow
Which one of the following is most reactive towards nucleophilic substitution reaction?
A)
\[C{{H}_{2}}=CH-Cl\]
done
clear
B)
\[{{C}_{6}}{{H}_{5}}Cl\]
done
clear
C)
\[C{{H}_{3}}CH=CH-Cl\]
done
clear
D)
\[ClC{{H}_{2}}-CH=C{{H}_{2}}\]
done
clear
View Answer play_arrow
Which of the following is strongest Lewis base?
A)
\[C{{H}_{3}}^{-}\]
done
clear
B)
\[N{{H}_{2}}^{-}\]
done
clear
C)
\[O{{H}^{-}}\]
done
clear
D)
\[{{F}^{-}}\]
done
clear
View Answer play_arrow
The polynucleated condition appeared by free nuclear division without cytokinesis is
A)
Syncytium
done
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B)
Coenocytic
done
clear
C)
Found in amphibian oocyte
done
clear
D)
All of these
done
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View Answer play_arrow
What is the similarity between gymnosperms and angiosperms?
A)
Phloem of both have companian cells.
done
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B)
Endosperm is formed before fertilization in both.
done
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C)
Origin of ovule and seed is similar in both.
done
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D)
Both have leaves, stem and roots.
done
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View Answer play_arrow
Fibrous root system is better adapted than tap root system for
A)
transport of organic matter
done
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B)
absorption of water and minerals
done
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C)
storage of food
done
clear
D)
anchorage of plant to soil
done
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View Answer play_arrow
Which of the following element is necessary for translocation of sugars in plants?
A)
Boron
done
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B)
Molybdenum
done
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C)
Manganese
done
clear
D)
Iron
done
clear
View Answer play_arrow
In meiosis, actual haploidy in terms of DNA comes in
A)
Metaphase-I
done
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B)
Anaphase-II
done
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C)
Anaphase-I
done
clear
D)
Interkinesis
done
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View Answer play_arrow
Proton pumps in the plasma membranes of plant cells may
A)
generate a membrane potential that helps drive cations into the cell through their specific carriers.
done
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B)
be coupled to the movement of \[{{K}^{+}}\]into guard- cells.
done
clear
C)
drive the accumulation of sucrose in sieve- tube members.
done
clear
D)
be involved in all of the above
done
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View Answer play_arrow
The Z-scheme refers to
A)
the type of photosynthesis occurs in plants found in areas with minimal precipitation.
done
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B)
the pattern ofgrana within the chloroplasts of photosynthetic plants.
done
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C)
the carbon-fixation process which is also known as the Calvin cycle.
done
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D)
an energy diagram for the transfer of electrons in the light reactions of photosynthesis in plants.
done
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View Answer play_arrow
Which one of the following statement regarding auxin is/are correct?
A)
IAA and IBA are natural but NAA, 2, 4-D and 2, 4, 5-T are synthetic auxins.
done
clear
B)
IAA and NAA are natural but IBA, 2, 4, 5-T and 2, 4-D are synthetic auxin.
done
clear
C)
NAA and 2, 4, 5-T are natural but IAA, IBA and 2, 4-D are synthetic auxins.
done
clear
D)
IAA, NAA, IBA, 2, 4-D and 2, 4, 5-T are synthetic auxins.
done
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View Answer play_arrow
In angiospermic plant having chromosome number of 12 will have chromosome number in integuments and nucellus
A)
4
done
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B)
6
done
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C)
12
done
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D)
24
done
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View Answer play_arrow
When two gray-bodied fruit flies are mated, their offspring total 86 gray-bodied males, 81 yellow- bodied males, and 165 grey-bodied females. The allele for yellow body is
A)
sex-linked and dominant.
done
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B)
not sex-linked and dominant.
done
clear
C)
sex-linked and recessive.
done
clear
D)
not sex-linked and recessive.
done
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View Answer play_arrow
In negative operon
A)
co-repressor binds with represser
done
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B)
co-repressor does not bind with represser
done
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C)
co-repressor binds with inducer
done
clear
D)
cAMP have negative effect on lac operon
done
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View Answer play_arrow
Which of the following does not have stomata?
A)
Hydrophytes
done
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B)
Mesophytes
done
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C)
Xerophytes
done
clear
D)
Submerged hydrophytes
done
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View Answer play_arrow
Which of the following is pair of No-fertilizers?
A)
Azolla and BGA
done
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B)
Nostoc and legumes
done
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C)
Rhizobium and grasses
done
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D)
Salmonella and E. coli
done
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View Answer play_arrow
Transgenic plants are the ones:
A)
generated by introducing foreign DNA into a cell and regenerating a plant from that cell.
done
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B)
produced after protoplast fusion in artificial medium.
done
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C)
grown m artificial medium after hybridization in the field.
done
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D)
produced by a somatic embryo in artificial medium.
done
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View Answer play_arrow
Which one of the following is the matching pair of a sanctuary and its main protected wild animals:
A)
North Eastern Himalayan region \[-\] Sambar
done
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B)
Sunderbans \[-\] Rhino
done
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C)
Gir \[-\] Lion
done
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D)
Kaziranga \[-\] Musk deer
done
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View Answer play_arrow
The basis of karyotaxonomyis
A)
Number of nucleoli
done
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B)
Sedimentation rate ofribosomes
done
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C)
Chromosome banding
done
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D)
Chromosome number
done
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View Answer play_arrow
In Chlorophyceae, sexual reproduction occurs by
A)
isogamy and anisogamy
done
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B)
isogamy, anisogamy and oogamy
done
clear
C)
oogamy only
done
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D)
anisogamy and oogamy
done
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View Answer play_arrow
Velamen is found in
A)
roots of screwpine
done
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B)
aerial and terrestrial roots of orchids
done
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C)
leaves of Ficus elastic
done
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D)
only aerial roots of orchids
done
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View Answer play_arrow
Collenchyma differs from parenchyma in having
A)
living protoplasm
done
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B)
cellulose walls
done
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C)
vacuoles
done
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D)
pectin deposits at comers
done
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View Answer play_arrow
Which of the following amino acid has a hydroxyl group?
A)
Valine
done
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B)
Threonine
done
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C)
Leucine
done
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D)
Histidine
done
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View Answer play_arrow
Aquaporins are
A)
Cytoplasmic connections between cortex cells.
done
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B)
Openings in the lower epidermis of leaves through which water vapour escapes
done
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C)
Openings into root hairs through which water enters
done
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D)
Water specific channels in membranes that may regulate the rate of osmosis.
done
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View Answer play_arrow
Which one is a \[{{C}_{4}}\]-plant?
A)
Papaya
done
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B)
Pea
done
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C)
Potato
done
clear
D)
Maize/Corn
done
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View Answer play_arrow
Which of the following is an important intermediate found in all the types of respiration?
A)
Acetyl CoA
done
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B)
Pyruvic acid
done
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C)
Oxaloacetate
done
clear
D)
Tricarboxylic acid
done
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View Answer play_arrow
Tomatoes exhibiting delayed ripening were developed by a biotechnique that involved:
A)
DNA against enzymes
done
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B)
Antisense RNA
done
clear
C)
Mutation
done
clear
D)
None of the above
done
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View Answer play_arrow
In tertiary structure of DNA, what is a histone octamer?
A)
A complex consisting of eight positively charged histone proteins (two of each \[{{H}_{2}}A,\]\[{{H}_{2}}B,\]\[{{H}_{3}}\] and\[{{H}_{4}}\]) that aid in the packaging of DNA.
done
clear
B)
A complex consisting of eight negatively charged histone proteins (two of each \[{{H}_{2}}A,\] \[{{H}_{2}}B,\]\[{{H}_{3}}\] and\[{{H}_{4}}\]) that aid in the packaging of DNA.
done
clear
C)
A complex consisting of nine positively charged histone proteins (\[{{H}_{1}}\] and two of each \[{{H}_{2}}A,\]\[{{H}_{2}}B,\]\[{{H}_{3}}\]and\[{{H}_{4}}\]) that aid in the packaging DNA.
done
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D)
A complex consisting of nine negatively charged histone proteins (\[{{H}_{1}}\] and two of each \[{{H}_{2}}B,\]\[{{H}_{3}}\]and\[{{H}_{4}}\]) that aid in the packaging of DNA.
done
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View Answer play_arrow
Which one among the following chemicals is used for causing defoliation of forest trees?
A)
Phosphon-D
done
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B)
Malic hydrazide
done
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C)
2, 4-dichlorophenoxy acetic acid
done
clear
D)
Amo-1618
done
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View Answer play_arrow
If the forest cover is reduced to half, what is most likely to happen on a long term basis?
A)
Tribals living in these areas will starve to death
done
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B)
Cattle in these and adjoining areas will die due to lack of fodder
done
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C)
Large areas will become deserts
done
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D)
Crop breeding programmes will suffer due to a reduced availability of variety of germplasm
done
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View Answer play_arrow
Major aerosol pollutant in jet plane emission is
A)
Sulphur dioxide
done
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B)
Carbon monoxide
done
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C)
Methane
done
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D)
Fluorocarbon
done
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View Answer play_arrow
Which one is correct match
A. Soil I. Recharge B. Ground water II. Rotational grazing C. Forest management III. Reverine forest D. Grassland management IV. Taungya E. Wetland V. Erosion VI. Energy
A)
A\[\to \]V, B\[\to \]I, C\[\to \]IV, D\[\to \]II, E\[\to \]III
done
clear
B)
A\[\to \]I, B\[\to \]IV, C\[\to \]III, D\[\to \]II, E\[\to \]V
done
clear
C)
A\[\to \]V, B\[\to \]I, C\[\to \]IV, D\[\to \]III, E\[\to \]II
done
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D)
A\[\to \]V, B\[\to \]II, C\[\to \]III, D\[\to \]IV, E\[\to \]I
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The amalgamation for six-kingdom classification into domains given by Carl Woese was based upon
A)
Types of r-RNA
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B)
Sequence of ribosomal RNA genes
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C)
Sequence of genes on DNA
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D)
Cell wall composition
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Sexual reproduction in Spirogyra is an advanced feature because it shows
A)
physiologically differentiated sex organs
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B)
different sizes of motile sex organs
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C)
same size of motile sex organs
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D)
morphologically different sex organs
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Moniliform or beaded roots are storage root in
A)
Dahlia
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B)
Asparagus
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C)
Momordica
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D)
Portulaca
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Which of the following plant shows multiple epidermis?
A)
Croton
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B)
Allium
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C)
Nerium
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D)
Cucurbita
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Select the correct statement with respect to mitosis.
A)
Chromatids separate but remain in the centre of the cell in anaphase.
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B)
Chromatids start moving towards opposite poles in telophase.
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C)
Golgi complex and endoplasmic reticulum are still visible at the end of prophase.
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D)
Chromosomes move to the spindle equator and get align
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In an experiment, mature leaves on the plant were enclosed for a fixed amount of time in a transparent bag that had radioactive \[C{{O}_{2}}.\] In which part of the plant will maximum radioactivity be found after some time?
A)
Actively growing leaves.
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B)
Guard cells of all the leaves.
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C)
In mature leaves.
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D)
Senescing leaves and roots.
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In laboratory experiments, two species of the protist Paramecium were grown alone and in the presence of the other species. The following graphs show growth of species 1 (left) and species 2 (right), both alone and when in mixed culture.
Interpretation of these graphs shows that
A)
Competitive exclusion occurred in these experiments.
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B)
Both species are affected by interspecific competition but species 1 is affected less.
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C)
Both species are affected by interspecific competition but species 2 is affected less.
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D)
Both species are affected equally by interspecific competition.
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Which one of the following insecticides is more stable in the environment?
A)
DDT
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B)
Diazinon
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C)
Camphechlor
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D)
Malathion
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If by radiation all nitrogenase enzymes are inactivated, then there will be no
A)
fixation of nitrogen in legumes
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B)
fixation of atmospheric nitrogen
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C)
conversion from nitrate to nitrite in legumes
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D)
conversion from ammonium to nitrate in soil
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Which one of the following is an example of Ex- situ conservation?
A)
Wildlife sanctuary
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B)
Seed bank
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C)
Sacred groves
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D)
National park
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The class of enzymes that catalyze the removal of a group from a substrate without addition of water, leaving double bonds, is
A)
Transferases
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B)
Dehydrogenases
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C)
Hydrolases
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D)
Lyases
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The main organelle involved in modification and routing of newly synthesized proteins to their destinations is
A)
chloroplast
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B)
mitochondria
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C)
lysosome
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D)
endoplasmic reticulum
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Which of the following statements about nitrogen fixation is false?
A)
Nitrogenase is only catalytic under anaerobic conditions.
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B)
The energy for nitrogen fixation can be provided by either photosynthesis or respiration.
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C)
In nitrogen fixation, nitrogen is reduced by the addition of three successive pairs of hydrogen atoms.
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D)
Most nitrogen fixing microbes are aerobic.
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When a photosynthetic plant is transferred to an atmosphere of enriched \[{{O}_{2,}}\] its rate of
A)
photosynthesis would increase.
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B)
photosynthesis would decrease.
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C)
respiration would decrease.
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D)
osmosis would increase.
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The diagram below summarises the stages involved in respiratory metabolism of mammalian skeletal muscle.
Stage 4 in the diagram occurs in mammalian muscle cells under anaerobic conditions. Why is surge 4 necessary?
A)
to detoxfying, pyruvate
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B)
to form lactate which is immediately reconverted to glycogen.
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C)
to oxidise the reduced nicotinamide adenine di-nucleotide facilitating stage 2
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D)
to reduce the oxidised nicotinamide adenine dinucleotide facilitating stage 2
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Common enzyme in giycolysis and pentose phosphate pathways is
A)
hexokinase
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B)
aconitase
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C)
famarase
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D)
dehydrogenase
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Bacteria lack alternation of generation because there is
A)
neither syngamy nor reduction division.
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B)
distinct chromosomes are absent.
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C)
no conjugation.
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D)
no exchange of genetic material.
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Which one of the following categories of animals, is correctly described with no single exception in it?
A)
All sponges are marine and have collar cells.
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B)
All mammals are viviparous and possess diaphragm for breathing.
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C)
All bony fishes have four pairs of gills and an operculum on each side.
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D)
All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal).
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Which word combination applies to stratified squamous epithelium?
A)
Mesoderm \[-\] calcification
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B)
Ecoderm \[-\] keratinization
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C)
Mesoderm \[-\] ossification
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D)
Endoderm \[-\] cornification
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Which of the following is a component of vitamin (thiamine, biotin), Acetyl CoA, cysteine, methionine and ferredoxin?
A)
Fe
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B)
S
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C)
Co
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D)
K
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About 70% of \[C{{O}_{2}}\] is transported as
A)
Carbonic acid
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B)
Carboxyhaemoglobin
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C)
Bicarbonates
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D)
Carbamino compounds
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In human heart, which of the following valve remains in contact of the oxygenated blood only?
A)
Tricuspid valve
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B)
Semilunar valve
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C)
Eustachian valve
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D)
Mitral valve
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The urine under normal conditions does not contain glucose because
A)
The normal blood sugar is fructose
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B)
Glucose of blood is not filtered in the glomerulus
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C)
Glucose in glomerular filtrate is reabsorbed in the uriniferous tubules
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D)
Glucose in glomerular filtrate is converted into glycogen.
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Which of the following sets of vertebrate hormones are all produced in the anterior pituitary gland?
A)
Somatostatin, vasopressin, insulin
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B)
Prolactin, growth hormone, enkephalins
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C)
Oxytocin, prolactin, adrenocorticotropin
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D)
Estrogen, progesterone, testosterone
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Which one of the following statements is incorrect about menstruation?
A)
During normal menstruation about 40 ml. blood is lost
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B)
The menstrual fluid can easily clot
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C)
At menopause in the female, there is especially abrupt increase in gonadotropic hormones
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D)
The beginning of the cycle of menstruation is called menarche
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Find the incorrect match
A)
Super bug \[-\]A.N. Chakroborty
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B)
Minisatellite \[-\] Alee Jeffrey
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C)
Genomics \[-\] Roderick
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D)
Dolly \[-\] Gurdon
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In which condition, the gene ratio remains constant for any species?
A)
Sexual selection
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B)
Random mating
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C)
Mutation
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D)
Gene flow
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Geometric representation of age structure is a characteristic of
A)
population
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B)
landscape
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C)
ecosystem
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D)
biotic community
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What is true for monoclonal antibodies?
A)
These antibodies obtained from one parent and for one antigen
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B)
These antibodies obtained from one parent and for two antigens
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C)
These antibodies obtained from one parent and for many antigens
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D)
These antibodies obtained from many parents and for many antigens
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Phosphorus is a sedimentary nutrient. This means it
A)
cycles very slowly.
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B)
never enters the atmosphere.
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C)
settles as sediment in the ocean.
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D)
All of the above
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Genetic material of TMV is
A)
RNA
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B)
DNA
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C)
Both
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D)
Protein
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All but one of the following bones are found in the human appendicular skeleton. Select the exception.
A)
Finger bones
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B)
Upper arm bone
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C)
Jaw bone
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D)
Ankle bones
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In which of the following animals, respiration occurs without any respiratory organ?
A)
Frog
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B)
Fish
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C)
Cockroach
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D)
Earthworm
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Spending the dry hot period in an inactive state by an animal is
A)
camouflage
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B)
hibernation
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C)
aestivation
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D)
mullerian mimicry
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In animal cells, cytokinesis involves
A)
the separation of sister chromatids
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B)
the contraction of the contractile ring of microfilament
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C)
depolymerisation of kinetochore microtubules
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D)
a protein kinase that phosphorylates other enzymes
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Myocardial Infarction is caused by
A)
hardening of arteries
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B)
lumpy thickness develop in the inner walls of arteries
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C)
clot may occur in the lumen of a coronary artery
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D)
sudden interruption in blood flow towards a portion of heart
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Continued consumption of a diet rich in butter, red meat and eggs for a long period may lead to
A)
vitamin toxicity
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B)
kidney stones
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C)
hypercholesterolemia
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D)
urine laden with ketone bodies
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The scientific value of a "DNA chip" is that
A)
researchers can determine how an entire genome functions.
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B)
DNA can be monitored for the presence of particular mutations.
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C)
the activity of all the genes in an organism can be monitored at once.
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D)
All of the above
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In an egg, the type of cleavage is determined by
A)
shape and size of the sperm
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B)
size and location of the nucleus
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C)
amount and distribution of yolk
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D)
number of egg membranes
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If for some reason, the vasa efferentia in the human reproductive system gets blocked, the gametes will not be transported from
A)
testes to epididymis
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B)
epididymis to vas deferens
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C)
ovary to uterus
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D)
vagina to uterus
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Medical Termination of Pregnancy (MTP) is considered safe up to how many weeks of pregnancy?
A)
Eight weeks
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B)
Twelve weeks
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C)
Eighteen weeks
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D)
Six weeks
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During blood taping, agglutination indicates that the
A)
RBCs carry certain antigens
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B)
Plasma contains certain antigens
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C)
RBCs carry certain antibodies
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D)
Plasma contains certain antibodies
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Ultrasound of how much frequency is beamed into human body for sonography?
A)
15-30 MHz
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B)
1-15 MHz
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C)
45-70 MHz
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D)
30-45 MHz
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Cry I endotoxins obtained from Bacillus thuringiensis are effective against
A)
mosquitoes
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B)
flies
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C)
nematodes
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D)
boll worms
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Retention of larval characters even after sexual maturity is called
A)
Parthenogenesis
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B)
Ontogenesis
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C)
Paedogenesis
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D)
Neoteny
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Which of the following type of enzyme is not matched correctly with the molecule that it breaks down?
A)
Amylase-starch
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B)
Lipase-starch
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C)
Protease-proteins
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D)
Disaccharidase-sugars
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The alveoli contain specialized cells that secrete a phospholipoprotein complex known as pulmonary surfactant. The function of pulmonary surfactant is:
A)
to provide some rigidity to the alveoli to prevent lung collapse
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B)
to decrease the surface tension of the alveoli, making it easier to expand them
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C)
to facilitate the diffusion of \[{{O}_{2}}\] and \[C{{O}_{2}}\] by providing protein channels through which these gases flow
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D)
to provide a sticky surface upon which dust and microbes are trapped and disposed of
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The structure which prevents the entry of food into the windpipe is
A)
Gullet
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B)
Glottis
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C)
Tonsil
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D)
Epiglottis
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Layer of cells that secrete enamel of tooth is
A)
Osteoblast
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B)
Ameloblast
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C)
Odontoblast
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D)
Dentoblast
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Cow's milk is slightly yellowish in colour due to the presence of
A)
Carotene
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B)
Riboflavin
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C)
Xanthophyll
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D)
Xanthophyll and Carotene
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Blood plasma contains proteins but glomerular filtrate does not. Why does this difference in composition occur?
A)
Blood osmotic pressure is maintained by the presence of plasma proteins
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B)
Proteins are actively transported from the kidney tubule back into the blood capillaries
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C)
Proteins cannot pass through the membranes of the glomerular capillaries.
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D)
There is a high hydrostatic pressure in the blood within the glomerular capillaries.
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Which is not correct with respect to human kidney?
A)
The peripheral region is called cortex and central medulla
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B)
Malpighian capsules are present in the cortex region
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C)
Blood enters glomerulus through efferent arterioles
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D)
The concave part of kidney is called hilus
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Frequency of sound is discriminated by
A)
The intensity of movement of basilar fibres of cochlea
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B)
The type of fluid - perilymph or endolymph
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C)
The site at the cochlear coil
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D)
All of these
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Which one of the following is the correct difference between rod cells and cone cells of our retina?
A)
Distribution Rod Cells - More concentrated in centre of retina Cone Cells - Evently distributed all over retina
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B)
Visual acuity Rod Cells - High Cone Cells - Low
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C)
Visual pigment contained Rod Cells - Iodopsin Cone Cells - Rhodopsin
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D)
Over all function Rod Cells - Vision in poor light Cone Cells - Colour vision and detailed vision in bright light
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Which of the following glands grows to the maximum size at puberty and then diminishes gradually?
A)
Thymus
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B)
Pituitary
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C)
Thyroid
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D)
Adrenal
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Which of the following statements about human pregnancy and fetal development is falser
A)
The blastocyst is a stage in fetal development that appears early during the third trimester.
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B)
A vital connection between the fetal and maternal blood supplies occurs at the placenta.
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C)
Most of the growth in fetal size occurs during the second and third trimesters.
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D)
All major organ systems have formed by the end of the fetus's first three months of life.
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Saltatory conduction of nerve impulse takes place through:
A)
Myelinated fibre
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B)
Non-myelinated fibre
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C)
Gray fibres
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D)
None of these
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In which part of the brain corpora quadrigemina is located?
A)
Diencephalon
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B)
Mesencephalon
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C)
Prosencephalon
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D)
Rhombencephalon
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The joint between _____(i)_____ and ____(ii)____ forms ball and socket joint.
A)
(i) - Humerus, (ii) - Ulna
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B)
(i) - Humerus, (ii) - Scapula
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C)
(i) - Ulna, (ii) - Radius
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D)
(i) - Ulna, (ii) - Scapula
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Meningitis, a disease which is responsible for damage of the membrane of the brain, is caused by:
A)
Neisseria
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B)
Bordetella
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C)
Bacillus
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D)
Yersinia
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Which of the following shows the correct graph of arithmetic growth?
A)
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B)
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C)
done
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D)
done
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