When a bar magnet falls through a long hollow metal cylinder fixed with its axis vertical, the final acceleration of the magnet is
|
(a) Equal to zero |
|
(b) Less than g |
|
(c) Equal to g |
|
(d) Equal to g in to beginning and then more than g |
(a) Equal to zero
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A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be
|
(a) |
(b) |
(c) |
(d) |
If a number of sine waves with modulation indices n1, n2, n3 ........ modulate a carrier wave, then total modulation index (n) of the wave is
|
(a) n1 + n2 .... + 2(n1 + n2.....) |
(b) |
|
(c) |
(d) None of these |
Approximate height of ozone layer above the ground is
|
(a) 60 to 70 km |
(b) 59 km to 80 km |
(c) 70 km to 100 km |
(d) 100 km to 200 km |
When phosphorus and antimony are mixed in zermaniun, then
|
(a) P-type semiconductor is formed |
(b) N-type semiconductor is formed |
|
(c) Both (a) and (b) |
(d) None of these |
Ohm's law is true
|
(a) For metallic conductors at low temperature |
|
(b) For metallic conductors at high temperature |
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(c) For electrolytes when current passes through them |
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(d) For diode when current flows |
The sensation of vision in the retina is carried to the brain by
|
(a) Ciliary muscles |
(b) Blind spot |
(c) Cylindrical lens |
(d) Optic nerve |
Assertion : Neutrons penetrate matter more readily as compared to protons.
Reason : Neutrons are slightly more massive than protons.
|
(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. |
|
(d) If the assertion and reason both are false. |
