Polar molecules are the molecules:

 1 that acquires a dipole moment only when the magnetic field is absent. 2 has a permanent electric dipole moment. 3 has zero dipole moment. 4 that acquire a dipole moment only in the presence of an electric field due to displacement of charges.  Subtopic:  Electric Dipole |
62%
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A particle is released from a height of S above the surface of the earth. At a certain height, its kinetic energy is three times its potential energy. The distance from the earth's surface and the speed of the particle at that instant are respectively:

 1 $${S \over 2},{ \sqrt{3gS} \over 2}$$ 2 $${S \over 4}, \sqrt{3gS \over 2}$$ 3 $${S \over 4},{ {3gS} \over 2}$$ 4 $${S \over 4},{ \sqrt{3gS} \over 3}$$  Subtopic:  Conservation of Mechanical Energy |
67%
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Column-I gives certain physical terms associated with flow of current through a metallic conductor.

Column-II gives some mathematical relations involving electrical quantities.

Match Column-I and Column-II with appropriate relations.

 Column-I Column-II (A). Drift Velocity (P). $$\frac{ \mathrm{m}}{\mathrm{ne}^2 \rho}$$ (B). Electrical Resistivity (Q). $$nev_d$$ (C). Relaxation Period (R). $$\frac{ \mathrm{eE}}{\mathrm{m}} \tau$$ (D). Current Density (S). $$\frac{E}{J}$$

 (A). (B). (C). (D). 1. (R). (P). (S). (Q). 2. (R). (Q). (S). (P). 3. (R). (S). (P). (Q). 4. (R). (S). (Q). (P).  Subtopic:  Current & Current Density |
52%
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If force [F], acceleration [A] and time [T] are chosen as the fundamental physical quantities, then find the dimensions of energy.

1. [F][A][T-1]

2. [F][A-1][T]

3. [F][A][T]

4. [F][A][T2]  Subtopic:  Dimensions |
62%
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The escape velocity from the Earth's surface is v. The escape velocity from the surface of another planet having a radius, four times that of Earth and same mass density is:

 1 3v 2 4v 3 v 4 2v  Subtopic:  Escape velocity |
58%
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A small block slides down on a smooth inclined plane starting from rest at time $$t=0.$$ Let $$S_n$$ be the distance traveled by the block in the interval $$t=n-1$$ to $$t=n.$$ Then the ratio $$\frac{S_n}{S_{n +1}}$$ is:
1. $$\frac{2n+1}{2n-1}$$
2. $$\frac{2n}{2n-1}$$
3. $$\frac{2n-1}{2n}$$
4. $$\frac{2n-1}{2n+1}$$  Subtopic:  Uniformly Accelerated Motion |
54%
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The velocity of a small ball of mass $$M$$ and density $$d$$, when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is $$d\over 2$$ then the viscous force acting on the ball will be:

 1 $$\frac{3Mg}{2}$$ 2 $$2Mg$$ 3 $$\frac{Mg}{2}$$ 4 $$Mg$$  Subtopic:  Viscosity |
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A thick current-carrying cable of radius 'R' carries current 'I' uniformly distributed across its cross-section. The variation of magnetic field B(r) due to the cable with the distance 'r' from the axis of the cable is represented by:

 1 2 3 4   Subtopic:  Ampere Circuital Law |
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Find the value of the angle of emergence from the prism given below for the incidence ray shown. The refractive index of the glass is $\sqrt{3}$. 1. $45°$

2. $90°$

3. $60°$

4. $30°$  Subtopic:  Refraction at Plane Surface |
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A screw gauge gives the following readings when used to measure the diameter of a wire:
Main scale reading: $$0$$ mm
Circular scale reading: $$52$$ divisions
Given that $$1$$ mm on the main scale corresponds to $$100$$ divisions on the circular scale, the diameter of the wire that can be inferred from the given data is:
1. $$0.26$$ cm
2. $$0.052$$ cm
3. $$0.52$$ cm
4. $$0.026$$ cm  Subtopic:  Measurement & Measuring Devices |
65%
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