An electric dipole of dipole moment \({p}\) is aligned parallel to a uniform electric field \({E}.\) The energy required to rotate the dipole by \(90^\circ\) is:
1. \( p^2 E\)
2. \( p E\)
3. infinite
4. \( {pE}^2\)
1. \( p^2 E\)
2. \( p E\)
3. infinite
4. \( {pE}^2\)
Subtopic: Electric Dipole |
88%
Level 1: 80%+
NEET - 2013
Hints
A charge \(q\) is placed at the centre of the line joining two equal positive charges \(Q.\) The system of the three charges will be in equilibrium, if \(q\) is equal to:
| 1. | \(\dfrac{-Q}{4}\) | 2. | \(\dfrac{Q}{4}\) |
| 3. | \(\dfrac{-Q}{2}\) | 4. | \(\dfrac{Q}{2}\) |
Subtopic: Coulomb's Law |
66%
Level 2: 60%+
NEET - 2013
Hints
A car is moving in a circular horizontal track of radius \(10~\text m\) with a constant speed of \(10~\text{m/s}.\) A bob is suspended from the roof of the car by a light wire of length \(1.0~\text m.\) The angle made by the wire with the vertical is:
| 1. | \(\dfrac{\pi}{3} \) | 2. | \(\dfrac{\pi}{6}\) |
| 3. | \(\dfrac{\pi}{4}\) | 4. | \(0^\circ\) |
Subtopic: Uniform Circular Motion |
70%
Level 2: 60%+
NEET - 2013
Hints
A bar magnet of the magnetic moment \(M\) is placed at right angles to a magnetic induction \(B.\) If a force \(F\) is experienced by each pole of the magnet, the length of the magnet will be:
| 1. | \(\dfrac{MB}{F}\) | 2. | \(\dfrac{BF}{M}\) |
| 3. | \(\dfrac{MF}{B}\) | 4. | \(\dfrac{F}{MB}\) |
Subtopic: Bar Magnet |
75%
Level 2: 60%+
NEET - 2013
Hints
The radius of a planet is twice the radius of the Earth. Both have almost equal average mass densities. If \(v_P\) and \(v_E\) are escape velocities of the planet and the earth, respectively, then:
| 1. | \(v_P = 1.5 v_E\) | 2. | \(v_P = 2v_E\) |
| 3. | \(v_E = 3 v_P\) | 4. | \(v_E = 1.5v_P\) |
Subtopic: Escape velocity |
78%
Level 2: 60%+
NEET - 2013
Hints
If the ratio of diameters, lengths and Young's modulus of steel and copper wires shown in the figure are \(p,\) \(q\) and \(s\) respectively, then the corresponding ratio of increase in their lengths would be:
| 1. | \(\dfrac{5 q}{7 {sp}^2} \) | 2. | \(\dfrac{7 q}{5 sp^2} \) |
| 3. | \(\dfrac{2 q}{5 s p} \) | 4. | \(\dfrac{7 q}{5 s p}\) |
Subtopic: Young's modulus |
78%
Level 2: 60%+
NEET - 2013
Hints
A parallel beam of light of wavelength \(\lambda\) is incident normally on a narrow slit. A diffraction pattern is formed on a screen placed perpendicular to the direction of the incident beam. At the second minimum of the diffraction pattern, the phase difference between the rays coming from the two edges of the slit is:
1. \(2 \pi\)
2. \(3 \pi\)
3. \(4 \pi\)
4. \( \pi \lambda\)
1. \(2 \pi\)
2. \(3 \pi\)
3. \(4 \pi\)
4. \( \pi \lambda\)
Subtopic: Diffraction |
59%
Level 3: 35%-60%
NEET - 2013
Hints
A particle of mass \(m\) is kept at rest at a height \(3R\) from the surface of the Earth, where \(R\) is the radius of the Earth and \(M\) is the mass of the Earth. The minimum speed with which it should be projected, so that it does not return, is:
(where \(g\) is the acceleration due to gravity on the surface of the Earth)
(where \(g\) is the acceleration due to gravity on the surface of the Earth)
| 1. | \(\left(\dfrac{{GM}}{2 {R}}\right)^{\frac{1}{2}} \) | 2. | \(\left(\dfrac{{g} R}{4}\right)^{\frac{1}{2}} \) |
| 3. | \( \left(\dfrac{2 g}{R}\right)^{\frac{1}{2}} \) | 4. | \(\left(\dfrac{G M}{R}\right)^{\frac{1}{2}}\) |
Subtopic: Escape velocity |
74%
Level 2: 60%+
NEET - 2013
Hints
A current of \(2.5~\text A\) flows through a coil of inductance \(5~\text H.\) The magnetic flux linked with the coil is:
1. \(0.5~\text{Wb}\)
2. \(12.5~\text{Wb}\)
3. zero
4. \(2~\text{Wb}\)
1. \(0.5~\text{Wb}\)
2. \(12.5~\text{Wb}\)
3. zero
4. \(2~\text{Wb}\)
Subtopic: Self - Inductance |
84%
Level 1: 80%+
NEET - 2013
Hints
The reddish appearance of the sun at sunrise and sunset is due to:
| 1. | the scattering of light. |
| 2. | the polarisation of light. |
| 3. | the colour of the sun. |
| 4. | the colour of the sky. |
Subtopic: Total Internal Reflection |
88%
Level 1: 80%+
NEET - 2013
Hints
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