Complete the reaction ![]()
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(a) |
(b) |
(c) |
(d) |
Complete the reaction ![]()
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(a) |
(b) |
(c) |
(d) |
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When light rays from the sun fall on a convex lens along a direction parallel to its axis
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(a) Focal length for all colours is the same |
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(b) Focal length for violet colour is the shortest |
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(c) Focal length for yellow colour is the longest |
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(d) Focal length for red colour is the shortest |
A monochromatic beam of light passes from a denser medium into a rarer medium. As a result
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(a) Its velocity increases |
(b) Its velocity decreases |
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(c) Its frequency decreases |
(d) Its wavelength decreases |
The magnetic flux linked with a coil, in webers, is given by the equations ∅ =
Then the magnitude of induced e.m.f. at t = 2 second will be
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(a) 2 volt |
(b) 4 volt |
(c) 8 volt |
(d) 16 volt |
A polaroid is placed at 45o to an incoming light of intensity . Now the intensity of light passing through polaroid after polarisation would be
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(a) |
(b) |
(c) |
(d) Zero |
Cathode rays are similar to visible light rays in that
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(a) They both can be deflected by electric and magnetic fields |
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(b) They both have a definite magnitude of wavelength |
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(b) They both have a definite magnitude of wavelength |
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(d) They both can expose a photographic plate |