To convert a galvanometer into a voltmeter, one should connect a
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(a) High resistance in series with galvanometer |
|
(b) Low resistance in series with galvanometer |
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(c) High resistance in parallel with galvanometer |
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(d) Low resistance in parallel with galvanometer |
(a) High resistance in series with galvanometer
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Order of magnitude of density of uranium nucleus is (
|
(a) |
(b) |
(c) |
(d) |
The maximum distance upto which TV transmission from a TV tower of height h can be received is proportional to
|
(a) h1/2 |
(b) h |
(c) h3/2 |
(d) h2 |
Assertion : The ferromagnetic substance do not obey Curie’s law.
Reason : At Curie point a ferromagnetic substance start behaving as a paramagnetic substance.
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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. |
Serious draw back of the semiconductor device is
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(a) They cannot be used with high voltage |
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(b) They pollute the environment |
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(c) They are costly |
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(d) They do not last for long time |
The variation of induced emf (E) with time (t) in a coil if a short bar magnet is moved along its axis with a constant velocity is best represented as
(a)
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(b)
|
(c)
|
(d)
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If L is the coherence length and c the velocity of light, the coherent time is
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(a) cL |
(b) |
(c) |
(d) |
