One Tesla is equal to
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(a) |
(b) |
(c) |
(d) |
One Tesla is equal to
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(a) |
(b) |
(c) |
(d) |
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Two identical induction coils each of inductance L joined in series are placed very close to each other such that the winding direction of one is exactly opposite to that of the other, what is the net inductance
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(a) L2 |
(b) 2L |
(c) L/2 |
(d) Zero |
A study of binary stars is most helpful in
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(a) Finding their distances |
(b) Finding their temperature |
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(c) Finding their masses |
(d) Verifying Newton's force law of gravitation |
Given a point source of light, which of the following can produce a parallel beam of light
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(a) Convex mirror |
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(b) Concave mirror |
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(c) Concave lens |
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(d) Two plane mirrors inclined at an angle of 90° |
In the middle of the depletion layer of a reverse-biased PN junction, the
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(a) Potential is zero |
(b) Electric field is zero |
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(c) Potential is maximum |
(d) Electric field is maximum |
Assertion : Radioactivity of
undecayed radioactive nuclei of half life of 50 days is equal to that of 1.2
number of undecayed nuclei of some other material with half life of 60 days
Reason : Radioactivity is proportional to half-life.
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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. |