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A small bar magnet A oscillates in a horizontal plane with a period T at a place where the angle of dip is 60o. When the same needle is made to oscillate in a vertical plane coinciding with the magnetic meridian, its period will be
(a) 
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(b) T |
(c) 
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(d) 2T |
An elementary particle of mass m and charge +e is projected with velocity v at a much more massive particle of charge Ze, where Z > 0. What is the closest possible approach of the incident particle
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(a) |
(b) |
(c) |
(d) |
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4D, the power of a cutlens will be:
In a semiconductor
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(a) There are no free electrons at any temperature |
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(b) The number of free electrons is more than that in a conductor |
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(c) There are no free electrons at 0 K |
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(d) None of these |
When light travels from one medium to the other of which the refractive index is different, then which of the following will change
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(a) Frequency, wavelength and velocity |
(b) Frequency and wavelength |
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(c) Frequency and velocity |
(d) Wavelength and velocity |
