A solid conducting sphere of radius R1 is surrounded by another concentric hollow conducting sphere of radius R2. The capacitance of this assembly is proportional to
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(a) |
(b) |
(c) |
(d) |
(d) 
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Assertion : Blue colour of sky appears due to scattering of blue colour.
Reason : Blue colour has shortest wave length in visible spectrum.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
A current I flows along the length of an infinitely long, straight and thin-walled pipe. Then
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(a) The magnetic field at all points inside the pipe is the same but not zero |
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(b) The magnetic field at any point inside the pipe is zero |
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(c) The magnetic field is zero only on the axis of the pipe |
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(d) The magnetic field is different at different points inside the pipe |
A and B are two conductors carrying a current i in the same direction. x and y are two electron beams moving in the same direction
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(a) There will be repulsion between A and B attraction between x and y |
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(b) There will be attraction between A and B, repulsion between x and y |
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(c) There will be repulsion between A and B and also x and y |
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(d) There will be attraction between A and B and also x and y |
The time period of rotation of the sun is 25 days and its radius is 7
. The Doppler shift for the light of wavelength 6000 Å emitted from the surface of the sun will be
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(a) 0.04 Å |
(b) 0.40 Å |
(c) 4.00 Å |
(d) 40.0 Å |
Microscope is an optical instrument which
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(a) Enlarges the object |
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(b) Increases the visual angle formed by the object at the eye |
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(c) Decreases the visual angle formed by the object at the eye |
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(d) Brings the object nearer |
In hydrogen atom, electron makes transition from n=4 to n=1 level. Recoil momentum of the H atom will be
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(a) 3.4 |
(b) 6.8 |
|
(c) 3.4 |
(d) 6.8 |
Two condensers of capacity 0.3 μF and 0.6 μF respectively are connected in series. The combination is connected across a potential of 6 volts . The ratio of energies stored by the condensers will be
|
(a) |
(b) 2 |
(c) |
(d) 4 |
The resistivity of a wire depends on its
|
(a) Length |
(b) Area of cross-section |
(c) Shape |
(d) Material |
