# The light rays having photons of energy $$4.2~\text{eV}$$ are falling on a metal surface having a work function of $$2.2~\text{eV}.$$ The stopping potential of the surface is: 1.  $$2~\text{eV}$$ 2.  $$2~\text{V}$$ 3.  $$1.1~\text{V}$$ 4.  $$6.4~\text{V}$$

Subtopic:  Einstein's Photoelectric Equation |
64%
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In the diagram shown, the normal reaction force between $$2$$ kg and $$1$$ kg blocks is:
(Consider the surface to be smooth and $$g=10$$ ms–2 )

1. $$25$$ N
2. $$39$$ N
3. $$6$$ N
4. $$10$$ N
Subtopic:  Tension & Normal Reaction |
50%
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Identify the equivalent logic gate represented by the circuit given below:

1. $$\mathrm{OR}$$
2. $$\mathrm{NOR}$$
3. $$\mathrm{AND}$$
4. $$\mathrm{NAND}$$
Subtopic:  Logic gates |
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Two copper vessels $$A$$ and $$B$$ have the same base area but are of different shapes. $$A$$ takes twice the volume of water that $$B$$ requires to fill up to a particular common height. Then the correct statement among the following is:
1. pressure on the base area of vessels $$A$$ and $$B$$ is same.
2. pressure on the base area of vessels $$A$$ and $$B$$ is not same.
3. both vessels $$A$$ and $$B$$ weigh the same.
4. vessel $$B$$ weighs twice that of $$A$$.
Subtopic:  Pressure |
68%
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The distance between the two plates of a parallel plate capacitor is doubled, and the area of each plate is halved. If $$C$$ is its initial capacitance, its final capacitance is equal to:
 1 $$2C$$ 2 $$\frac{C}{2}$$ 3 $$4C$$ 4 $$\frac{C}{4}$$
Subtopic:  Capacitance |
78%
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The terminal velocity of a copper ball of radius $$5~\text{mm}$$ falling through a tank of oil at room temperature is $$10~\text{cm}~\text{s}^{-1}$$ . If the viscosity of oil at room temperature is $$0.9~\text{kg}~\text{m}^{-1}~\text{s}^{-1}$$, the viscous drag force is:
1. $$8.48 \times10^{-3}$$ N
2. $$8.48 \times10^{-5}$$ N
3. $$4.23 \times10^{-3}$$ N
4. $$4.23 \times10^{-6}$$ N
Subtopic:  Stokes' Law |
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If $$\vec F=2\hat i+\hat j-\hat k$$ and $$\vec r=3\hat i+2\hat j-2\hat k,$$ then the scalar and vector products of $$\vec F$$ and $$\vec r$$ have the magnitudes, respectively, as:
1.  $$5, ~\sqrt3$$
2.  $$4,~ \sqrt5$$
3.  $$10, ~\sqrt2$$
4.  $$10,~2$$
Subtopic:  Vector Product |
75%
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After passing through a polarizer, a linearly polarized light of intensity $$I$$ is incident on an analyser making an angle of $$30^\circ$$ with the axes of the polariser. The intensity of light emitted from the analyser will be:
 1 $$\frac{I}{2}$$ 2 $$\frac{I}{3}$$ 3 $$\frac{3I}{4}$$ 4 $$\frac{2I}{3}$$
Subtopic:  Polarization of Light |
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The restoring force of a spring, with a block attached to the free end of the spring, is represented by:

 1 2 3 4
Subtopic:  Spring mass system |
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If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:
 1 angular separation of the fringes increases. 2 angular separation of the fringes decreases. 3 linear separation of the fringes increases. 4 linear separation of the fringes decreases.
Subtopic:  Young's Double Slit Experiment |
63%
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