A parallel plate condenser with a dielectric of constant K between the plates has a capacity C and is charged to a potential V volt. The dielectric slab is slowly removed from between the plates and then reinserted. The network done by the system is this process is:
A)
0
done
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B)
\[\frac{1}{2}(K-1)C{{V}^{2}}\]
done
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C)
\[\frac{C{{V}^{2}}(K-1)}{K}\]
done
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D)
\[(K-1)C{{V}^{2}}\]
done
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View Answer play_arrow
In the circuit shown in the figure. If the potential at point A is taken to be 0, the potential at point B is
A)
\[-1V\]
done
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B)
\[+2V\]
done
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C)
\[-2V\]
done
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D)
+1V
done
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View Answer play_arrow
An electric dipole is placed at the centre of a hollow conducting sphere. Which of the following is correct?
A)
Electric field is 0 at every point of sphere.
done
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B)
Electric field is non-zero anywhere on the sphere.
done
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C)
The flux of electric field is 0 through the sphere.
done
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D)
All are true.
done
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Acceleration-velocity graph of a particle moving in a straight line is as shown in figure. Then slope of velocity displacement graph
A)
increases linearly.
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B)
decreases linearly.
done
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C)
is constant.
done
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D)
increases parabolically.
done
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View Answer play_arrow
A particle is projected at an angle of \[60{}^\circ \] above the horizontal with a speed of 10 m/s. After some time the direction of its velocity makes an angle of \[30{}^\circ \] above the horizontal. The speed of the particle at this instant is
A)
\[\frac{5}{\sqrt{3}}m/s\]
done
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B)
\[5\sqrt{3}\,m/s\]
done
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C)
\[5\,m/s\]
done
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D)
\[\frac{10}{\sqrt{3}}\,m/s\]
done
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View Answer play_arrow
On the displacement-time graph, two straight lines make angles \[60{}^\circ \] and \[30{}^\circ \], with time axis as shown in the figure. The ratio of the velocities represented by them is
A)
1 : 2
done
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B)
1 : 3
done
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C)
2 : 1
done
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D)
3 : 1
done
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View Answer play_arrow
Three blocks of masses\[{{m}_{1}},{{m}_{2}}\]and\[{{m}_{3}}\]are connected by massless string as shown in the figure on a friction- less table. They are pulled with a force\[{{T}_{3}}=40\,N.\]If \[{{m}_{1}}=10\,kg,\,{{m}_{2}}=6kg\]and \[{{m}_{3}}=4\,kg,\]tension \[{{T}_{2}}=\]will be
A)
20 N
done
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B)
40 N
done
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C)
10 N
done
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D)
32 N
done
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View Answer play_arrow
A conducting bar is pulled with a constant speed U on a smooth conducting rail. The region has a steady magnetic field of induction B as shown in the figure. If the speed of the bar is doubled then the rate of heat dissipation will:
A)
remain constant.
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B)
become quarter of the initial value.
done
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C)
become four fold.
done
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D)
get doubled.
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View Answer play_arrow
A conducting loop of resistance R and radius r has its centre at the origin of the coordinate system in a magnetic field of induction B. When it is rotated about F-axis through \[90{}^\circ \], the net charge flown in the loop is directly proportional to:
A)
\[{{B}^{-1}}\]
done
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B)
R
done
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C)
\[{{r}^{2}}\]
done
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D)
r
done
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View Answer play_arrow
The ratio of time constants during current growth and current decay of the circuit shown in the figure is
A)
1 : 1
done
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B)
3 : 2
done
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C)
2 : 3
done
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D)
1 : 3
done
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View Answer play_arrow
A cubical block of wood of specific gravity 0.5 and a chunk of concrete of specific gravity 2.5 are fastener together. The ratio of the mass of wood to the mass of concrete which makes the combination to float with its entire volume submerged under water is:
A)
\[\frac{1}{5}\]
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B)
\[\frac{1}{3}\]
done
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C)
\[\frac{3}{5}\]
done
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D)
\[\frac{2}{5}\]
done
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View Answer play_arrow
The surface tension of a soap solution is\[2\times {{10}^{-2}}N/m.\]it To blow a bubble of radius 1 cm, the work done is
A)
\[4\pi \times {{10}^{-6}}J\]
done
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B)
\[8\pi \times {{10}^{-6}}J\]
done
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C)
\[12\pi \times {{10}^{-6}}J\]
done
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D)
\[16\pi \times {{10}^{-6}}J\]
done
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View Answer play_arrow
In a beaker, there is a hole at the bottom and a hole of same area is at the top and water starts flowing through it into the beaker with speed U, then:
A)
water level will oscillate about a height of\[{{U}^{2}}/2g\] is reached and remains constant
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B)
water level will rise till a height of \[{{U}^{2}}/2g\]reached and remains constant there after
done
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C)
no water will remains in the beaker
done
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D)
none of the above
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View Answer play_arrow
A hollow cylinder drum or radius r is placed with its axis vertical. It is rotated about an axis passing through its centre and perpendicular to the base and a body is placed on the inside surface of the drum. If the coefficient of friction is , the minimum frequency of revolution so that the body does not fall down is:
A)
\[\frac{1}{2\pi }\sqrt{\frac{\mu g}{r}}\]
done
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B)
\[\frac{1}{2\pi }\sqrt{\frac{g}{\mu r}}\]
done
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C)
\[\frac{1}{2\pi }\sqrt{\frac{g}{2\mu r}}\]
done
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D)
\[\frac{1}{2\pi }\sqrt{\frac{2\mu g}{r}}\]
done
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View Answer play_arrow
A uniform rod of mass m and length \[l\] rotates in a horizontal plane with an angular velocity co about a vertical axis passing through one end. The tension in the rod at a distance \[x\]from the axis is
A)
\[\frac{1}{2}m{{\omega }^{2}}x\]
done
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B)
\[\frac{1}{2}m{{\omega }^{2}}\frac{{{x}^{2}}}{\ell }\]
done
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C)
\[\frac{1}{2}m{{\omega }^{2}}\ell \left( l-\frac{x}{l} \right)\]
done
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D)
\[\frac{1}{2}\frac{m{{\omega }^{2}}}{l}({{l}^{2}}-{{x}^{2}})\]
done
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View Answer play_arrow
The coefficient of static friction between the two blocks is 0.363, what is the minimum acceleration of block 1 so that block 2 does not fall?
A)
\[~6\text{ }m{{s}^{-2}}\]
done
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B)
\[~12\text{ }m{{s}^{-2}}\]
done
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C)
\[~~18\text{ }m{{s}^{-2}}\]
done
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D)
\[~27\text{ }m{{s}^{-2}}\]
done
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For the system shown in the figure, the pulleys are light and frictionless. The tension in the string will be:
A)
\[\frac{2}{3}mg\,\sin \theta \]
done
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B)
\[\frac{3}{2}mg\,\sin \theta \]
done
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C)
\[\frac{1}{2}mg\,\sin \theta \]
done
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D)
\[2mg\,\sin \theta \]
done
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View Answer play_arrow
The area of the parallelogram determined by\[\vec{A}=2\hat{i}+\hat{j}-2\hat{k}\]and\[\vec{B}=12\hat{j}-2\hat{k}\]is:
A)
42
done
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B)
56
done
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C)
38
done
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D)
74
done
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View Answer play_arrow
In the system in figure \[{{m}_{B}}=4\,kg\]and \[{{m}_{A}}=2\,kg.\]The pulleys are massless and friction is absent every- where. The acceleration of block A is\[(g=10\,m{{s}^{-2}})\]
A)
\[2\,m/{{s}^{2}}\]
done
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B)
\[4\,m/{{s}^{2}}\]
done
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C)
\[\frac{10}{3}m/{{s}^{2}}\]
done
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D)
\[\frac{20}{3}\,m/{{s}^{2}}\]
done
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View Answer play_arrow
A man of mass m stands on a frame of mass M. He pulls on a light rope, which passes over a pulley. The other end of the rope is attached to the frame. For the system to be in equilibrium, what force must the man exert on the rope?
A)
\[\frac{1}{2}(M+m)g\]
done
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B)
\[(M+m)g\]
done
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C)
\[(M-m)g\]
done
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D)
\[(M+2m)g\]
done
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View Answer play_arrow
litres of a liquid with specific heat \[0.2\,cal/g{{m}^{-0}}C\]has the same thermal capacity as that of 20 litres of liquid with specific heat 0.3, find the ratio of their densities:
A)
3 : 1
done
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B)
1 : 3
done
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C)
1 : 6
done
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D)
6 : 1
done
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View Answer play_arrow
P-V diagram of a diatomic gas is a straight line passing through origin. The molar heat capacity of the gas in the process will be:
A)
4 R
done
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B)
2.5 R
done
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C)
3R
done
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D)
\[4\frac{R}{3}\]
done
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View Answer play_arrow
The internal energy of an ideal gas during isothermal expansion:
A)
increases
done
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B)
decreases
done
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C)
remains constant
done
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D)
becomes zero
done
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View Answer play_arrow
The equi-convex lens shown in the figure has focal length\[f.\] What will be the focal length of each half if the lens is cut along AB?
A)
\[\frac{f}{2}\]
done
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B)
\[f\]
done
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C)
\[\frac{3f}{2}\]
done
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D)
\[2f\]
done
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View Answer play_arrow
The mass and volume of a body are found to be 5.00 ± 0.05 kg and\[1.00\text{ }\pm \text{ }0.05\text{ }{{m}^{3}},\] respectively. Then the maximum possible percentage error in its density is
A)
6%
done
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B)
3%
done
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C)
7%
done
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D)
5%
done
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View Answer play_arrow
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to
A)
\[{{t}^{\frac{1}{2}}}\]
done
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B)
\[{{t}^{\frac{3}{4}}}\]
done
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C)
\[{{t}^{\frac{3}{2}}}\]
done
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D)
\[{{t}^{2}}\]
done
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View Answer play_arrow
If the coefficient of restitution between a ball and the floor is 0.5, what is the percentage loss of energy on each rebounding of a ball dropped from a height?
A)
12.5%
done
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B)
25%
done
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C)
50%
done
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D)
75%
done
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View Answer play_arrow
When a sphere rolls without slipping, the ratio of its kinetic energy of translation to its total kinetic energy is:
A)
1 : 7
done
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B)
1 : 2
done
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C)
1 : 1
done
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D)
5 : 7
done
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View Answer play_arrow
A T-shaped object with dimensions shown in the figure, is lying on a smooth floor. A force \[\vec{F}\]is applied at the point P parallel to AB, such that the object has only the translational motion without rotation. Find the location of P with respect to C
A)
\[\frac{4\ell }{3}\]
done
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B)
\[\ell \]
done
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C)
\[\frac{2\ell }{3}\]
done
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D)
\[\frac{3\ell }{2}\]
done
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View Answer play_arrow
Two satellites A and B go round a planet in circular orbits having radii 4R and R, respectively. If the speed of satellite A is 3v, then the speed of satellite B is
A)
\[\frac{3v}{2}\]
done
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B)
\[\frac{4v}{2}\]
done
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C)
\[6v\]
done
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D)
\[12v\]
done
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View Answer play_arrow
The electrical conductivity of a semiconductor increases when em radiation of wavelength shorter than 2480 nm is incident on it. The band gap (in eV) the semiconductor is:
A)
0.9
done
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B)
0.7
done
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C)
0.5
done
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D)
0.1
done
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View Answer play_arrow
The electric current in a circuit is given by: \[i=3t.\]Here t is in second and current in ampere. The rms current for the period t = 0 to t = 1 sec is:
A)
3 A
done
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B)
9 A
done
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C)
\[\sqrt{3A}\]
done
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D)
\[\sqrt[3]{3A}\]
done
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View Answer play_arrow
Light of two different frequencies whose photons have energies 1 and 2.5 eV, respectively, successively illuminate a metal whose work function is 0.5 eV. The ratio of the maximum speeds of the emitted electrons will be:
A)
1 : 5
done
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B)
1 : 4
done
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C)
1 : 2
done
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D)
1 : 1
done
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View Answer play_arrow
lionization potential of hydrogen atom is 13.6 Hydrogen atom in the ground state is excited by monochromatic radiation of photons of energy 12.1 eV. The number of spectral lines emitted by the hydrogen atom, according to Bohr's theory, will be
A)
one
done
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B)
two
done
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C)
three
done
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D)
four
done
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View Answer play_arrow
One of the line spectra emitted from the X-ray tube is \[10\overset{\text{o}}{\mathop{\text{A}}}\,.\] What is the energy level difference in the emitting atom that is responsible for X-rays?
A)
24.8 eV
done
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B)
12.4 eV
done
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C)
6.2 eV
done
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D)
10.2 eVs
done
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View Answer play_arrow
Two radioactive materials X and X have decay constants 10/1 and A., respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of \[{{X}_{1}}\]to that of \[{{X}_{2}}\]will be \[1/e\] after a time
A)
\[\frac{1}{(10\lambda )}\]
done
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B)
\[\frac{1}{(11\lambda )}\]
done
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C)
\[\frac{11}{(10\lambda )}\]
done
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D)
\[\frac{1}{(9\lambda )}\]
done
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View Answer play_arrow
Equations of two progressive waves at a certain point in a medium are given by \[{{y}_{1}}=a\sin (\omega t+{{\phi }_{1}}),\]and\[{{y}_{2}}=a\sin (\omega t+{{\phi }_{2}}).\]If amplitude and time period of resultant wave formed by the superposition of two waves is same as that of both the waves, then\[({{\phi }_{1}}-{{\phi }_{2}})\]is:
A)
\[\frac{\pi }{3}\]
done
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B)
\[\frac{2\pi }{3}\]
done
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C)
\[\frac{\pi }{6}\]
done
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D)
\[\frac{\pi }{4}\]
done
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View Answer play_arrow
It the ratio of intensities of two waves causing interference be 9:4, then the ratio of the resultant maximum and minimum intensities will be:
A)
9 : 4
done
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B)
3 : 2
done
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C)
25 : 1
done
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D)
5 : 1
done
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View Answer play_arrow
A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is
A)
-1.5 dioptre
done
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B)
-6.5 dioptre
done
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C)
+6.5 dioptre
done
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D)
+6.67 dioptre
done
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View Answer play_arrow
If two SHMs are represented by equations \[{{y}_{1}}=10\]\[\sin (3\pi t+\pi /4)\] and \[{{y}_{2}}=5[\sin (3\pi t)+\]\[\sqrt{3}\cos (3\pi t)]\]the ratio of their amplitudes is:
A)
2 : 1
done
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B)
1 : 2
done
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C)
1 : 1
done
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D)
\[1:\sqrt{2}\]
done
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View Answer play_arrow
The plane of a rectangular loop of wire with sides 0.05 m and 0.08 m is parallel to a uniform magnetic field of induction \[1.5\times {{10}^{-2}}\]Tesla. A current of 10.0 ampere flows through the loop. If the side of length 0.08 m is normal and the side of length 0.05 m is parallel to the lines of induction, then the torque acting on it is:
A)
\[~6000\text{ Newton }\!\!\times\!\!\text{ metre}\]
done
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B)
\[\text{0 Newton}\,\text{ }\!\!\times\!\!\text{ }\,\text{metre}\]
done
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C)
\[1.2\times {{10}^{-2}}\,\text{Newton}\,\text{ }\!\!\times\!\!\text{ }\,\text{metre}\]
done
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D)
\[6\times {{10}^{-4}}\,\text{Newton }\!\!\times\!\!\text{ metre}\]
done
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View Answer play_arrow
A long wire bent as shown in the figure carries I. If the radius of the semi-circular portion is a, the magnetic field at the centre of the semi-circle is:
A)
\[\frac{{{\mu }_{0}}I}{4a}\]
done
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B)
\[\frac{{{\mu }_{0}}I}{4\pi a}\sqrt{{{\pi }^{2}}+4}\]
done
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C)
\[\frac{{{\mu }_{0}}I}{4a}+\frac{{{\mu }_{0}}I}{2\pi a}\]
done
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D)
\[\frac{{{\mu }_{0}}I}{4\pi a}\sqrt{{{\pi }^{2}}-4}\]
done
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View Answer play_arrow
The long, straight wire as shown in the figure, carries a current i to the right that increases with time. What is the direction of the induced current in the circular wire loop, which lies in a plane perpendicular to the wire?
A)
Clockwise as viewed from the right.
done
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B)
Counterclockwise as viewed from the right.
done
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C)
There is no induced current.
done
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D)
The induced current is alternating.
done
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View Answer play_arrow
Which of the following quantities is 0 on an average for the molecules of an ideal gas in equilibrium
A)
Kinetic Energy
done
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B)
Momentum
done
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C)
Density
done
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D)
Speed
done
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View Answer play_arrow
A gas is expanded from volume \[{{V}_{0}}\]to \[2{{V}_{0}}\] under three different processes. Process 1 is isobaric, Process 2 is isothermal, and Process 3 is adiabatic. Let \[\Delta {{U}_{1}},\] \[\Delta {{U}_{2}},\]and \[\Delta {{U}_{3}}\] be the change in internal energy of the gas in these three processes. Then
A)
\[\Delta {{U}_{1}}>\Delta {{U}_{2}}>\Delta {{U}_{3}}\]
done
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B)
\[\Delta {{U}_{1}}<\Delta {{U}_{2}}<\Delta {{U}_{3}}\]
done
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C)
\[\Delta {{U}_{2}}<\Delta {{U}_{1}}<\Delta {{U}_{3}}\]
done
clear
D)
\[\Delta {{U}_{2}}<\Delta {{U}_{3}}<\Delta {{U}_{1}}\]
done
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View Answer play_arrow
The least volatile hydrogen halide is
A)
\[HF\]
done
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B)
\[HCl\]
done
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C)
\[HI\]
done
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D)
\[HBr\]
done
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View Answer play_arrow
Bromine water reacts with \[S{{O}_{2}}\]to form
A)
\[{{H}_{2}}O\]and \[HBr\]
done
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B)
\[HBr\] and S
done
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C)
\[{{H}_{2}}S{{O}_{4}}\]and \[HBr\]
done
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D)
S and\[{{H}_{2}}O\]
done
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View Answer play_arrow
The chemical formula of phosgene is
A)
\[CaOC{{l}_{2}}\]
done
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B)
\[COCl\]
done
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C)
\[CaC{{O}_{3}}\]
done
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D)
\[COC{{l}_{2}}\]
done
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View Answer play_arrow
Which of the following molecules has trigonal planar geometry?
A)
\[N{{H}_{3}}\]
done
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B)
\[B{{F}_{3}}\]
done
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C)
\[I{{F}_{3}}\]
done
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D)
\[P{{H}_{3}}\]
done
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View Answer play_arrow
Highest oxidation state of Mn is present in
A)
\[M{{n}_{2}}{{O}_{3}}\]
done
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B)
\[Mn{{O}_{2}}\]
done
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C)
\[KMn{{O}_{4}}\]
done
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D)
\[{{K}_{2}}Mn{{O}_{4}}\]
done
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View Answer play_arrow
In the following reaction, the product 'R' is \[Ca{{C}_{2}}\xrightarrow{{{H}_{2}}O}P\xrightarrow[\text{Tube}]{\text{Hot}\,\text{iron}}Q\xrightarrow[\text{AlC}{{\text{l}}_{\text{3}}}]{\text{C}{{\text{H}}_{\text{3}}}\text{Cl}}R\]
A)
Toluene
done
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B)
n-propylbenzene
done
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C)
Ethylbenzene
done
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D)
Benzene
done
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View Answer play_arrow
Ammonia on reaction with excess of chlorine gives
A)
\[{{N}_{4}}\]and\[N{{H}_{4}}Cl\]
done
clear
B)
\[NC{{l}_{3}}\]and\[HCl\]
done
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C)
\[{{N}_{2}}\]and\[HCl\]
done
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D)
\[NC{{l}_{3}}\]and\[N{{H}_{4}}Cl\]
done
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View Answer play_arrow
Deuterium nucleus contains
A)
\[2p+0n\]
done
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B)
\[1p+1n\]
done
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C)
\[2p+2n\]
done
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D)
\[1p+1{{e}^{-}}\]
done
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View Answer play_arrow
In which process, fused sodium hydroxide is electro- lysed for extraction of sodium?
A)
Cyanide process
done
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B)
Castner process
done
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C)
Down's process
done
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D)
Both (a) and (c)
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View Answer play_arrow
Number of atoms present in 4.25 g of \[N{{H}_{3}}\]is
A)
\[4\times 6.023\times {{10}^{23}}\]
done
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B)
\[6.023\times {{10}^{23}}\]
done
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C)
\[4.25\times 6.023\times {{10}^{23}}\]
done
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D)
\[1.7\times {{10}^{24}}\]
done
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View Answer play_arrow
If 1 ml of water contains 20 drops. Then number of molecules in a drop of water is
A)
\[4.346\times {{10}^{20}}\]molecules
done
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B)
\[1.344\times {{10}^{18}}\]molecules
done
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C)
\[1.376\times {{10}^{26}}\]molecules
done
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D)
\[6.023\times {{10}^{23}}\]molecules
done
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View Answer play_arrow
When adding 100 ml of \[HCl+35\,\,ml\] of \[NaOH\], the colour of methyl orange in the solution will be
A)
Yellow
done
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B)
Red
done
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C)
Methyl orange is not a suitable indicator
done
clear
D)
Can't be predicted
done
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View Answer play_arrow
A developer used in photography is
A)
A weak base
done
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B)
A weak acid
done
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C)
An oxidizing agent
done
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D)
A mild reducing agent
done
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View Answer play_arrow
Given, \[N{{H}_{3}}(g)+3C{{l}_{2}}(g)\]
\[NC{{l}_{3}}(g)+3HCl(g);-\Delta {{H}_{1}}\] (1)
\[{{N}_{2}}(g)+3{{H}_{2}}(g)2N{{H}_{3}}(g);-\Delta {{H}_{2}}\] (2)
\[{{H}_{2}}(g)+C{{l}_{2}}(g)\rightleftharpoons 2HCl(g);\Delta {{H }_{3}}\] (3)
The heat formation of \[NC{{l}_{3}}\,(g)\]in terms of \[\Delta {{H}_{1}},\,\Delta {{H}_{2}}\]and \[\Delta {{H}_{3}}\]is
A)
\[\Delta {{H}_{f}}=\Delta {{H}_{1}}+\frac{\Delta {{H}_{2}}}{2}-\frac{3}{2}\Delta {{H}_{3}}\]
done
clear
B)
\[\Delta {{H}_{f}}=-\Delta {{H}_{1}}+\frac{\Delta {{H}_{2}}}{2}-\frac{3}{2}\Delta {{H}_{3}}\]
done
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C)
\[\Delta {{H}_{f}}=\Delta {{H}_{1}}-\frac{\Delta {{H}_{2}}}{2}-\frac{3}{2}\Delta {{H}_{3}}\]
done
clear
D)
None of the above
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View Answer play_arrow
The electronegativity of the following elements increases in the order
A)
N, Si, C, P
done
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B)
C, N, Si, P
done
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C)
P, Si, N, C
done
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D)
Si, P, C, N
done
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View Answer play_arrow
Which of the following compounds on reaction with \[NaOH\] and \[N{{a}_{2}}{{O}_{2}}\]gives yellow colour?
A)
\[Al{{(OH)}_{3}}\]
done
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B)
\[Zn{{(OH)}_{2}}\]
done
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C)
\[CaC{{O}_{3}}\]
done
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D)
\[Cr{{(OH)}_{3}}\]
done
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View Answer play_arrow
At \[18{}^\circ C\], the conductance of\[{{H}^{+}}\] and \[C{{H}_{3}}CO{{O}^{-}}\]at an infinite dilution is 315 and 35 mho\[c{{m}^{2}}\,e{{q}^{-1}}\]respectively. The equivalent conductivity of\[C{{H}_{3}}COOH\] at infinite dilution is __ mho \[e{{m}^{2}}\,e{{q}^{-1}}\]
A)
280
done
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B)
350
done
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C)
315
done
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D)
30
done
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View Answer play_arrow
Permanent hardness of water can be removed by adding.
A)
K
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B)
\[N{{a}_{2}}C{{O}_{3}}\]
done
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C)
\[C{{l}_{2}}\]
done
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D)
\[Ca(OCl)Cl\]
done
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View Answer play_arrow
In the complex ion \[{{[Co{{(N{{H}_{3}})}_{6}}]}^{3+}},\] the\[N{{H}_{3}}\] molecules are linked to the central metal ion by
A)
Coordinate bonds
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B)
Hydrogen bonds
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C)
Covalent bonds
done
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D)
Ionic bonds
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View Answer play_arrow
How many moles of iodine are liberated when 1 mole of potassium dichromate reacts with potassium iodide?
A)
4
done
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B)
2
done
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C)
3
done
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D)
1
done
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View Answer play_arrow
Pure benzene freezes at \[5.3{}^\circ C\]. A solution of 0.223 g of phenylacetic acid \[({{C}_{6}}{{H}_{5}}C{{H}_{2}}COOH)\] in 4.4 g of benzene \[({{K}_{f}}=5.12\,K\,kg\,mo{{l}^{-1}})\] freezes at \[4.47{}^\circ C\]. From this observation, one can conclude that
A)
Phenylacetic acid undergoes partial ionization in benzene.
done
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B)
Phenylacetic acid exists as such in benzene.
done
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C)
Phenylacetic acid dimerizes in benzene.
done
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D)
Phenylacetic acid undergoes complete ionization in benzene.
done
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View Answer play_arrow
The reaction \[{{N}_{2}}{{O}_{5}}\]in\[CC{{l}_{4}}(solution)\to 2N{{O}_{2}}(solution)+\frac{1}{2}{{O}_{2}}(g)\] is of first order in\[{{N}_{2}}{{O}_{5}}\] with a rate constant of \[6.2\times {{10}^{-4}}{{s}^{-1}}.\]What is the value of rate of reaction when\[[{{N}_{2}}{{O}_{5}}]=1.25\,\text{mole}\,{{\text{L}}^{-1}}?\]
A)
\[6.35\times {{10}^{-3}}\,\text{mol}\,{{L}^{-1}}{{s}^{-1}}\]
done
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B)
\[5.15\times {{10}^{-5}}\,\text{mol}\,{{\text{L}}^{-1}}{{s}^{-1}}\]
done
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C)
\[3.85\times {{10}^{-4}}\,\text{mol}\,{{\text{L}}^{-1}}\,{{s}^{-1}}\]
done
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D)
\[7.75\times {{10}^{-4}}\,\text{mol}\,{{\text{L}}^{-1}}{{s}^{-1}}\]
done
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View Answer play_arrow
If 1 mole of an ideal gas expands isothermally at \[37{}^\circ C\] from 15 litres to 25 litres, the maximum work obtained is
A)
6.43 J
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B)
12.87 J
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C)
2.92 J
done
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D)
8.57 J
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View Answer play_arrow
Hydrolysis of trichloromethane with aqueous \[KOH\] gives
A)
Acetic acid
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B)
Methanol
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C)
Formic acid
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D)
Ethanol
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View Answer play_arrow
Which of the following transition metal ions is not coloured?
A)
\[{{V}^{3+}}\]
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B)
\[C{{u}^{+}}\]
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C)
\[N{{i}^{2+}}\]
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D)
\[C{{o}^{2+}}\]
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View Answer play_arrow
The shape of \[I{{F}_{7}}\]molecule is
A)
Pentagonal bipyramidal
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B)
Tetrahedral
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C)
Trigonal bipyramidal
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D)
Octahedral
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View Answer play_arrow
The compound containing coordinate bond is
A)
\[{{O}_{3}}\]
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B)
\[S{{O}_{3}}\]
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C)
\[{{H}_{2}}S{{O}_{4}}\]
done
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D)
All of these
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View Answer play_arrow
Maximum number of H bonds in one molecule of water is
A)
1
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B)
3
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C)
2
done
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D)
4
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View Answer play_arrow
Among the given compounds, the one which can be distinguished by\[AgN{{O}_{3}}\]is
A)
Ethylene
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B)
Ethane
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C)
Diethyl ether
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D)
Acetylene
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View Answer play_arrow
What will be the partial pressure of He and \[{{O}_{2}}\]respectively, if 200 ml of He at 0.66 atm and 400 ml of \[{{O}_{2}}\]at 0.52 atm pressure are mixed in 400 ml vessel at \[20{}^\circ C\]?
A)
0.33 and 0.52
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B)
0.33 and 0.56
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C)
0.25 and 0.45
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D)
0.38 and 0.52
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View Answer play_arrow
Which of the following carbonates is the most stable?
A)
\[CaC{{O}_{3}}\]
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B)
\[MgC{{O}_{3}}\]
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C)
\[~BaC{{O}_{3}}\]
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D)
\[~SrC{{O}_{3}}\]
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View Answer play_arrow
At room temperature, the eclipsed and staggered forms of ethane cannot be isolated because
A)
Both the conformers are equally stable.
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B)
They interconvert rapidly.
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C)
There is a large energy barrier of rotation around the o bond.
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D)
The energy difference between the conformers is large.
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View Answer play_arrow
In an experiment, 4 g of\[{{M}_{2}}{{O}_{x}}\]oxide was reduced to 2.8 g of the metal. If the atomic mass of the metal is \[56\,g\,mo{{l}^{-1}},\] the number of 0 atoms in the oxide is
A)
2
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B)
1
done
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C)
4
done
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D)
3
done
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View Answer play_arrow
If the supply of oxygen is limited, \[{{H}_{2}}S\]reacts with \[{{O}_{2}}\]to form
A)
\[{{H}_{2}}O+S\]
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B)
\[{{H}_{2}}O+S{{O}_{3}}\]
done
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C)
\[{{H}_{2}}O+S{{O}_{2}}\]
done
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D)
\[{{H}_{2}}S{{O}_{4}}+S\]
done
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View Answer play_arrow
Primary secondary and tertiary amines can be distinguished by
A)
Fehling's test
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B)
SchifFs test
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C)
Hinsberg test
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D)
Tollen's test
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View Answer play_arrow
Which of the following has the highest electron affinity?
A)
\[{{O}^{-}}\]
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B)
\[{{F}^{-}}\]
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C)
Na
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D)
O
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View Answer play_arrow
In the equation,\[4M+8C{{N}^{-}}+2{{H}_{2}}O+{{O}_{2}}\to \]\[4{{[M{{(CN)}_{2}}]}^{-}}+4O{{H}^{-}}\] Identify the metal M. It is
A)
Iron
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B)
Copper
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C)
Zinc
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D)
Gold
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View Answer play_arrow
IUPAC nomenclature of \[{{H}_{3}}C-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-CH=\overset{C{{H}_{3}}}{\mathop{\overset{|}{\mathop{C}}\,}}\,-C{{H}_{3}}\]
A)
2, 4, 4-Trimethylpent-3-ene
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B)
2, 4, 4-Trimethylpent-2-ene
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C)
2, 2, 4-Trimethylpent-2-ene
done
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D)
2, 2, 4-Trimethylpent-3-ene
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View Answer play_arrow
Number of acyclic isomers of the compound having the molecular formula \[{{C}_{4}}{{H}_{10}}O\]is
A)
4
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B)
7
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C)
6
done
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D)
5
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View Answer play_arrow
Violet coloured complex obtained in the detection of sulphur is
A)
\[N{{a}_{3}}[Fe(ONSNa){{(CN)}_{5}}]\]
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B)
\[N{{a}_{2}}[Fe(NO){{(CN)}_{5}}]\]
done
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C)
\[N{{a}_{4}}[Fe{{(CN)}_{5}}NOS]\]
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D)
Both (a) and (c)
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View Answer play_arrow
Hydrolysis of sucrose is called
A)
Esterification
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B)
Inversion
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C)
Saponification
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D)
Hydration
done
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View Answer play_arrow
The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at \[25{}^\circ C\] increases the temperature of 18.94 kg of water by \[0.632{}^\circ C\]. If the specific heat of water at \[25{}^\circ C\] is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is
A)
771.4 kcal
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B)
881.1 kcal
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C)
871.2 kcal
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D)
981.1 kcal
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View Answer play_arrow
In an organic compound, phosphorus is estimated as
A)
\[{{H}_{3}}P{{O}_{4}}\]
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B)
\[{{P}_{2}}{{O}_{5}}\]
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C)
\[M{{g}_{2}}{{P}_{2}}{{O}_{7}}\]
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D)
\[M{{g}_{3}}{{(P{{O}_{4}})}_{2}}\]
done
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View Answer play_arrow
If 1,3-Dibromopropane reacts with zinc and Nal, the product obtained is
A)
Propane
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B)
Propene
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C)
Hexane
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D)
Cyclopropane
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View Answer play_arrow
Chemical formula of Prussian blue is
A)
\[{{K}_{4}}[Fe{{(CN)}_{6}}]\]
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B)
\[N{{a}_{4}}[Fe{{(CN)}_{6}}]\]
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C)
\[F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}\]
done
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D)
None of these
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View Answer play_arrow
Oxalic acid when heated with concentrated \[{{H}_{2}}S{{O}_{4}}\]gives
A)
\[C{{O}_{2}}+{{H}_{2}}O\]
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B)
\[CO+C{{O}_{2}}+{{H}_{2}}O\]
done
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C)
CO only
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D)
\[C{{O}_{2}}\]only
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View Answer play_arrow
\[Pb+\] concentrated\[HN{{O}_{3}}\]gives
A)
\[Pb{{(N{{O}_{3}})}_{4}}+N{{O}_{3}}\]
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B)
\[Pb{{(N{{O}_{3}})}_{3}}{{N}_{2}}O\]
done
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C)
\[Pb{{(N{{O}_{3}})}_{2}}+N{{O}_{2}}\]
done
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D)
\[~PbN{{O}_{3}}+NO\]
done
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View Answer play_arrow
When ethanol is treated with Fehling's solution, it gives a precipitate of
A)
Cu
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B)
\[C{{u}_{2}}O\]
done
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C)
\[CuO\]
done
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D)
\[C{{u}_{3}}O\]
done
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View Answer play_arrow
The major organic product formed from the following 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
\[{{N}_{2}}\]gas will not be evolved upon reaction of\[HN{{O}_{2}}\]with which of the following amines
A)
\[{{1}^{o}}\]
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B)
\[{{3}^{o}}\]
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C)
\[{{2}^{o}}\]
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D)
Bothe (b) and (c)
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View Answer play_arrow
Binomial nomenclature consists of two words
A)
Genus and species
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B)
Order and family
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C)
Family and genus
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D)
Species and variety
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View Answer play_arrow
Reverse transcriptase is a/an
A)
RNA dependent RNA polymerase
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B)
DNA dependent RNA polymerase
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C)
DNA dependent DNA polymerase
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D)
RNA dependent DNA polymerase
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View Answer play_arrow
Tobacco Mosaic Virus (TMV) genes are
A)
Double-stranded RNA
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B)
Single-stranded RNA
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C)
Polyribonucleotides
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D)
Proteinaceous
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View Answer play_arrow
Which antibiotic inhabits interaction between tRNA and mRNA during bacterial protein synthesis?
A)
Neomycin
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B)
Streptomycin
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C)
Tetracycline
done
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D)
Erythromycin
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View Answer play_arrow
Which pair of the following belongs to basidiomycetes?
A)
Puffballs and claviceps
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B)
Peziza and stinkhorns
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C)
Morchella and mushrooms
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D)
Birds nest fungi and puffballs
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View Answer play_arrow
The plant group that produces spores and embryo but lacks vascular tissues and seeds is
A)
Pteridophyta
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B)
Rhodophyta
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C)
Bryophyta
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D)
Phaeophyta
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View Answer play_arrow
Multicellular branched rhizoids and leafy gametophytes are characteristics of
A)
All bryophytes
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B)
Some bryophytes
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C)
All pteridophytes
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D)
Some pteridophytes
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View Answer play_arrow
Polyribosomes are aggregates of
A)
Ribosomes and rRNA
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B)
Only rRNA
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C)
Peroxisomes
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D)
Several ribosomes held together by string of mRNA
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View Answer play_arrow
Membranous bag with hydrolytic enzymes which is used for controlling intracellular digestion of macro- molecules is
A)
Endoplasmic reticulum
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B)
Nucleosome
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C)
Lysosome
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D)
Phagosome
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View Answer play_arrow
Ribosomes are produced in
A)
Nucleolus
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B)
Cytoplasm
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C)
Mitochondria
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D)
Golgi body
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View Answer play_arrow
Which one of the following is not a constituent of cell membrane?
A)
Glycolipids
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B)
Proline
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C)
Phospholipids
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D)
Cholesterol
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View Answer play_arrow
A family of five daughters only is expecting their sixth issue. The chance of its being a son is
A)
Zero
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B)
25 per cent
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C)
50 per cent
done
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D)
100 per cent
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View Answer play_arrow
In a genetic cross having recessive epistasis, the F2 phenotypic ratio would be
A)
9 : 6 : 1
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B)
15 : 1
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C)
9 : 3 : 4
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D)
12 : 3 : 1
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View Answer play_arrow
Down's syndrome is due to
A)
Crossing over
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B)
Linkage
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C)
Sex-linked inheritance
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D)
Nondisjunction of chromosomes
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View Answer play_arrow
In a dihybrid cross \[\text{AABB }\!\!\times\!\!\text{ aabb, F2}\]progeny of AABB, AABb, AaBB and AaBb occurs in the ratio of
A)
1 : 1 : 1 : 1
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B)
9 : 3 : 3 : 1
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C)
1 : 2 : 2 : 1
done
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D)
1 : 2 : 2 : 4
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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)
Four
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B)
Seven
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C)
Six
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D)
Five
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View Answer play_arrow
Who proved that DNA is a basic genetic material?
A)
Griffith
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B)
Watson
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C)
Boveri and Sutton
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D)
Hershey and chase
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View Answer play_arrow
The telomeres of eukaryotic chromosomes consist of short sequences of
A)
Thymine rich repeats
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B)
Cytosine rich repeats
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C)
Adenine rich repeats
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D)
Guanine rich repeats
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View Answer play_arrow
Genetic engineering is possible because
A)
We can see the DNA by electron microscope.
done
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B)
We can cut the DNA at specific sites by endonucleases like DNase I.
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C)
Restriction endonucleases purified from bacteria can be used in vitro.
done
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D)
The phenomenon of transduction in bacteria is well understood.
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View Answer play_arrow
Germination of seed within fruit is
A)
Ovipary
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B)
Vivipary
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C)
Hypogeal
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D)
Epigeal
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View Answer play_arrow
Aril represents the edible part of
A)
Banana
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B)
Litchi
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C)
Mango
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D)
Apple
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View Answer play_arrow
What type of placentation is seen in sweet pea?
A)
Axile
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B)
Free central
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C)
Marginal
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D)
Basal
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View Answer play_arrow
Four radial vascular bundles are found in
A)
Dicot root
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B)
Monocot root
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C)
Dicot stem
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D)
Monocot stem
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View Answer play_arrow
Passage cells are thin walled cells found in
A)
Phloem elements that serve as entry points for substance for transport of other plant parts.
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B)
Testa of seeds to enable emergence of growing embryonic axis during seed germination.
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C)
Central region of style through which the pollen tube grows towards the ovary.
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D)
Endodermis of roots facilitating the rapid transport of water from cortex to pericycle.
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View Answer play_arrow
Amino acids are mostly synthesized from
A)
Mineral salts
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B)
Fatty acids
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C)
Volatile acids
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D)
\[\alpha -\]Ketoglutaric acid
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View Answer play_arrow
Which one of the following mineral elements plays an important role in biological nitrogen fixation?
A)
Molybdenum
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B)
Copper
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C)
Manganese
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D)
Zinc
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View Answer play_arrow
Stomata of a plant is open due to
A)
Influx of calcium ions
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B)
Influx of potassium ions
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C)
Efflux of potassium ions
done
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D)
Influx of hydrogen ions
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View Answer play_arrow
The first carbon dioxide acceptor in \[{{C}_{4}}\] plants is
A)
Phosphoenolpyruvate
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B)
Ribulose-1, 5-bisphosphate
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C)
Oxaloacetic acid
done
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D)
Phosphoglyceric acid
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View Answer play_arrow
Which one is \[a-{{C}_{4}}\]plant?
A)
Papaya
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B)
Pea
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C)
Potato
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D)
Maize/Corn
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View Answer play_arrow
Which pigment system is inactivated in red drop?
A)
PS-I and PS-II
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B)
PS-I
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C)
PS-II
done
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D)
None of these
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View Answer play_arrow
In animal cells, the first stage of glucose breakdown is
A)
Krebs cycle
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B)
Glycolysis
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C)
Oxidative phosphorylation
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D)
ETC
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View Answer play_arrow
During the stage in the complete oxidation of glucose is the greatest number of ATP molecules formed from ADP
A)
Glycolysis
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B)
Krebs cycle
done
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C)
Conversion of pyruvic acid to acetyl-CoA
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D)
Electron transport chain
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View Answer play_arrow
Total number of meiotic division required for forming 100 zygotes/100 grains of wheat is
A)
100
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B)
75
done
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C)
125
done
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D)
50
done
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View Answer play_arrow
Fertilization involving carrying of male gametes by pollen tube is
A)
Porogamy
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B)
Siphonogamy
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C)
Chalazogamy
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D)
Syngonogamy
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View Answer play_arrow
In angiosperms pollen tubes liberate their male gametes into the
A)
Central cell
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B)
Antipodal cell
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C)
Egg cell
done
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D)
Synergids
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View Answer play_arrow
The hormone responsible for apical dominance
A)
IAA
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B)
GA
done
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C)
ABA
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D)
Florigen
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View Answer play_arrow
An enzyme that can stimulate germination of barley seeds is
A)
Lipase
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B)
Protease
done
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C)
Invertase
done
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D)
\[\alpha -\]Amylase
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View Answer play_arrow
Treatment of seed at low temperature under moist conditions to break its dormancy is called
A)
Verbalization
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B)
Chelation
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C)
Stratification
done
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D)
Scarification
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View Answer play_arrow
Keystone species in an ecosystem are those
A)
Present in maximum number
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B)
That are most frequent
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C)
Attaining a large biomass
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D)
Contributing to ecosystem properties
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View Answer play_arrow
What is BOD?
A)
Amount of \[{{O}_{2}}\]utilized by organisms in water.
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B)
Amount of\[{{O}_{2}}\]utilized by microorganism's for biological oxidation.
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C)
Total amount of \[{{O}_{2}}\]present in water.
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D)
All the above.
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View Answer play_arrow
Drawback of DDT as pesticide is
A)
It becomes ineffective after sometime.
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B)
It is less effective than others.
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C)
It is not easily/rapidly degraded in nature.
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D)
It is highly expensive.
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View Answer play_arrow
Sonalika and Kalyan Sona are high yielding verities of
A)
Sugarcane
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B)
Rice
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C)
Wheat
done
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D)
Maize
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View Answer play_arrow
In maize, the hybrid vigour is exploited by
A)
Crossing of two inbred parental lines.
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B)
Harvesting seed from the most productive plants.
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C)
Inducing mutations.
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D)
Bombarding the seeds with DNA.
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View Answer play_arrow
LSD is
A)
Hallucinogenic
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B)
Sedative
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C)
Stimulant
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D)
Tranquilizer
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View Answer play_arrow
Parthenocarpic tomato fruits can be produced by
A)
Treating the plants with low concentrations of gibberellic acid and auxins.
done
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B)
Raising the plants from vernalized seeds.
done
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C)
Treating the plants with phenylmercuric acetate.
done
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D)
Removing androecium of flowers before the pollen grains are released.
done
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View Answer play_arrow
A nucleotide is formed of
A)
Purine, pyrimidine and phosphate
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B)
Purine, sugar and phosphate
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C)
Nitrogen base, sugar and phosphate
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D)
Pyrimidine, sugar and phosphate
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View Answer play_arrow
Which one contains four pyrimidine bases?
A)
GATCAATGC
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B)
GCUAGACAA
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C)
UAGCGGUAA
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D)
TGCCTAACG
done
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Most diverse macromolecules, found in the cell both physically and chemically are
A)
Proteins
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B)
Carbohydrates
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C)
Nucleic acids
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D)
Lipids
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Which of the following is not a reducing sugar?
A)
Galactose
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B)
Glucose
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C)
Maltose
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D)
Sucrose
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Antibodies in our body are complex
A)
Steroids
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B)
Prostaglandins
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C)
Glycoproteins
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D)
Lipoproteins
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Which is not a true amphibian animal?
A)
Salamander
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B)
Toad
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C)
Tortoise
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D)
Frog
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Malpighian tubules are
A)
Excretory organs of insects
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B)
Excretory organs of annelids
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C)
Respiratory organs of insects
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D)
Respiratory organs of annelids
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Pneumatic bones are expected to be found in
A)
Pigeon
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B)
House lizard
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C)
Frog's tadpole
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D)
Flying fish
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One of the following is a very unique feature of the mammalian body:
A)
Homeothermy
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B)
Presence of diaphragm
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C)
Four chambered heart
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D)
Rib cage
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In which one of the following sets of animals do all the four give birth to young ones?
A)
Platypus, penguin, bat, hippopotamus
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B)
Shrew, bat, cat, kiwi
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C)
Kangaroo, hedgehog, dolphin, loris
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D)
Lion, bat, whale, ostrich
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Metameric segmentation is the characteristic of
A)
Echinodermata and Annelida
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B)
Annelida and Arthropoda
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C)
Mollusca and Chordata
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D)
Platyhelminthes and Arthropoda
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Which animal has become extinct fromIndia?
A)
Snow Leopard
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B)
Hippopotamus
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C)
Wolf
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D)
Cheetah
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The functional unit of contractile system in striated muscle is
A)
Myofibril
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B)
Sarcomere
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C)
Z-band
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D)
Cross bridges
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ATPase enzyme needed for muscle contraction is located in
A)
Actinin
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B)
Troponin
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C)
Myosin
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D)
Actin
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The contraction of gall bladder is due to
A)
Gastrin
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B)
Cholecystokinin
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C)
Secretin
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D)
Enterogastrone
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Angiotensinogen is a protein produced and secreted by
A)
Endothelial cells (lining the blood vessels)
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B)
Liver cells
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C)
Juxtaglomerular (JG) cells
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D)
Macula densa cells
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In alveoli of the lungs, the air at the site of gas exchange is separated from the blood by
A)
Alveolar epithelium only.
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B)
Alveolar epithelium and capillary endothelium.
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C)
Alveolar epithelium, capillary endothelium and tunica adventitia.
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D)
Alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia.
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Child death may occur in the marriage between
A)
\[R{{h}^{+}}\]man and \[R{{h}^{+}}\]woman
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B)
\[R{{h}^{+}}\] man and\[R{{h}^{-}}\]woman
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C)
\[R{{h}^{-}}\]man and \[R{{h}^{-}}\]woman
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D)
\[R{{h}^{-}}\] man and\[R{{h}^{-}}\]woman
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Pace maker of heart is
A)
AV node
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B)
Bundle of His
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C)
SA node
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D)
Purkinje fibres
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Bundle of His is a network of
A)
Nerve fibres found throughout the heart.
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B)
Muscle fibres distributed throughout the heart walls.
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C)
Muscle fibres found only in the ventricle wall.
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D)
Nerve fibres distributed in ventricles.
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Nitrogenous waste products are eliminated mainly as
A)
Urea in tadpole and ammonia in adult frog.
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B)
Ammonia in tadpole and urea in adult frog.
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C)
Urea in both tadpole and adult frog.
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D)
Urea in tadpole and uric acid in adult frog.
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Lysozyme that is present in perspiration and tears destroys
A)
Certain types of bacteria
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B)
All viruses
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C)
Most virus-infected cells
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D)
Certain fungi
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Which statement is correct for muscle contraction?
A)
Length of H-line decreases
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B)
Length of A-band remains constant
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C)
Length of I-band increases
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D)
Length of two Z-lines increases
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Respiratory centre is situated in
A)
Cerebellum
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B)
Medulla oblongata
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C)
Hypothalamus
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D)
Cerebrum
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In the chemistry of vision in mammals, the photo- sensitive substance is called
A)
Sclerotin
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B)
Retinol
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C)
Rhodopsin
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D)
Melanin
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Which hormone possesses anti-insulin effect?
A)
Cortisol
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B)
Calcitonin
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C)
Oxytocin
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D)
Aldosterone
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Which one of the following pairs matches a hormone with a disease resulting from its deficiency?
A)
Insulin - Diabetes insipidus
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B)
Relaxin - Gigantism
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C)
Prolactin - Cretinism
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D)
Parathyroid hormone - Tetany
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The correct sequence in the process of development of human embryo is
A)
Fertilization - zygote - cleavage - morula - blastula - gastrula
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B)
Fertilization -cleavage-morula-zygote-blastula-gastrula
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C)
Fertilization - zygote - blastula - morula - cleavage - gastrula
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D)
Cleavage - zygote - Fertilization - morula - blastula - gastrula
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What is true for cleavage?
A)
Size of embryo increases
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B)
Size of cells decrease
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C)
Size of cells increase
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D)
Size of embryo decreases
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The gland that regresses with age is
A)
Adrenal
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B)
Gonad
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C)
Thymus
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D)
Thyroid
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Barr body in human female is formed by
A)
Inactivation of paternal X chromosome
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B)
Inactivation of maternal X chromosome
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C)
Inactivation of both X chromosomes
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D)
Inactivation of either the paternal or maternal X chromosome
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Which of the following is an example of pleiotropic effect?
A)
Haemophilia
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B)
Thalassemia
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C)
Sickle cell anaemia
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D)
Colour blindness
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Which one of the following is an example of polygenic inheritance?
A)
Production of male honey bee
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B)
Pod shape in garden pea
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C)
Skin colour in humans
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D)
Flower colour in Mirabilis jalapa
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The homologous organs are those that show similarity in
A)
Size
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B)
Origin
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C)
Function
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D)
Appearance
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Extremities, tail and ear are relatively shorter in animals living in cooler regions as compared to those inhabiting warmer zones. This is
A)
Bergman's rule
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B)
Jordan's rule
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C)
Gloger's rule
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D)
Alien's rule
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Hugo de Vries gave his mutation theory on organic evolution while working on
A)
Pisum sativum
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B)
Drosophila melanogaster
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C)
Oenothera lamarckiana
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D)
Althea rosea
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Which is the correct order of increasing geological time scale for a hypothetical vertebrate evolution?
A)
Cenozoic, Mesozoic, Palaeozoic, Precambrian
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B)
Cenozoic, Palaeozoic, Mesozoic, Precambrian
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C)
Precambrian, Cenozoic, Palaeozoic, Mesozoic
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D)
Precambrian, Palaeozoic, Mesozoic, Cenozoic
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Forelimbs of cat and lizard is used in walking; fore- limbs of whale is used in swimming and forelimbs of bats is used in flying are an example of
A)
Analogous organs
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B)
Adaptive radiation
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C)
Homologous organs
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D)
Convergent evolution
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The earliest animal to have been domesticated by man was most likely the
A)
Horse
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B)
Cow
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C)
Dog
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D)
Pig
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The human immunodeficiency virus (HIV) has a protein coat and a genetic material which is a
A)
Single-stranded DNA
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B)
Double-stranded DNA
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C)
Single-stranded RNA
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D)
Double-stranded RNA
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The formula for exponential population growth is
A)
\[\frac{dN}{dt}=rN\]
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B)
\[\frac{rN}{dN}=dt\]
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C)
\[\frac{dN}{dt}=rN\]
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D)
\[\frac{dt}{dN}=rN\]
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The wild type E. coli cells are growing in normal medium with glucose. They are transferred to a medium containing only lactose as sugar. Which of the following changes takes place?
A)
The lac operon is repressed
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B)
All operons are induced
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C)
The lac operon is induced
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D)
E. coli cells stop dividing
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In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids?
A)
60
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B)
20
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C)
64
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D)
61
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The Montreal Protocol which serves as an appropriate action to protect the ozone layer from human activities was passed in the year.
A)
1987
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B)
1988
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C)
1985
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D)
1986
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Oxygen dissociation curve of haemoglobin is
A)
Sigmoid
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B)
Hyperbolic
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C)
Linear
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D)
Parabolic
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