The minimum deviation produced by a hollow prism filled with a certain liquid is found to be 30°. The light ray is also found to be refracted at angle of 30°. The refractive index of the liquid is
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(a) |
(b) |
(c) |
(d) |
(a) 
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Which of the following statements concerning the depletion zone of an unbiased PN junction is (are) true
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(a) The width of the zone is independent of the densities of the dopants (impurities) |
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(b) The width of the zone is dependent on the densities of the dopants |
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(c) The electric field in the zone is produced by the ionized dopant atoms |
|
(d) b, c |
The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell
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(a) 1.2 Ω |
(b) 1.3 Ω |
(c) 1.1 Ω |
(d) 1.4 Ω |
Two metal spheres of radii 
and 
are charged to the same potential. The ratio of charges on the spheres is
|
(a) |
(b) |
(c) |
(d) |
Which is reverse biased diode
|
(a)
|
(b)
|
(c)
|
(d)
|
The magnetic moment of a magnet of length 10 cm and pole strength 4.0 Am will be
|
(a) |
(b) 1.6 |
(c) 20 |
(d) 8.0 |
Energy in the sun is generated mainly by
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(a) Fusion of radioactive material |
(b) Fission of helium atoms |
|
(c) Chemical reaction |
(d) Fusion of hydrogen atoms |
The image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object. The distance of the object from the mirror is
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(a) 30 cm |
(b) 90 cm |
(c) 120 cm |
(d) 60 cm |
