In the given circuit, with steady current, the potential drop across the capacitor must be

|
(a) V |
(b) V / 2 |
(c) V / 3 |
(d) 2V / 3 |
In the given circuit, with steady current, the potential drop across the capacitor must be

|
(a) V |
(b) V / 2 |
(c) V / 3 |
(d) 2V / 3 |
(c) V / 3
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Two wires A and B of same material and mass have their lengths in the ratio 1 : 2. On connecting them to the same source, the rate of heat dissipation in B is found to be 5W. The rate of heat dissipation in A is
|
(a) 10W |
(b) 5W |
(c) 20W |
(d) None of these |

The wavelength of light emitted from second orbit to first orbits in a hydrogen atom is
|
(a) 1.215 |
(b) 1.215 |
(c) 1.215 |
(d) 1.215 |

Two spheres of radius a and b respectively are charged and joined by a wire. The ratio of electric field of the spheres is
|
(a) a/b |
(b) b/a |
(c) |
(d) |
Assertion : Silicon is preferred over germanium for making semiconductor devices.
Reason : The energy gap for germanium is more than the energy gap of silicon.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Which of the following is coldest planet
|
(a) Mercury |
(b) Pluto |
(c) Earth |
(d) Venus |