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The current in a coil of inductance 5 H decreases at the rate of 2 A/s. The induced e.m.f. is
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(a) 2 V |
(b) 5 V |
(c) 10 V |
(d) – 10 V |
A convex lens of crown glass (n =1.525) will behave as a divergent lens if immersed in
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(a) Water (n = 1.33) |
(b) In a medium of n = 1.525 |
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(c) Carbon disulphide n = 1.66 |
(d) It cannot act as a divergent lens |
When a ray of light emerges from a block of glass, the critical angle is
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(a) Equal to the angle of reflection |
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(b) The angle between the refracted ray and the normal |
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(c) The angle of incidence for which the refracted ray travels along the glass-air boundary |
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(d) The angle of incidence |
A permanent magnet
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(a) Attracts all substances |
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(b) Attracts only magnetic substances |
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(c) Attracts magnetic substances and repels all non-magnetic substances |
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(d) Attracts non-magnetic substances and repels magnetic substances |
Consider an electron (m = 9.1 
confined by electrical forces to move between two rigid walls separated by 1.0 
metre, which is about five atomic diameters. The quantised energy value for the lowest stationary state is
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(a) 12 |
(b) 6.0 |
(c) 6.0 |
(d) 6 Joule |
A laser beam is used for carrying out surgery because it
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(a) Is highly monochromatic |
(b) Is highly coherent |
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(c) Is highly directional |
(d) Can be sharply focussed |
