On adjusting the P-N junction diode in forward biased
|
(a) Depletion layer increases |
(b) Resistance increases |
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(c) Both decreases |
(d) None of these |
(c) Both decreases
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When a certain circuit consisting of a constant e.m.f. E an inductance L and a resistance R is closed, the current in, it increases with time according to curve 1. After one parameter (E, L or R) is changed, the increase in current follows curve 2 when the circuit is closed second time. Which parameter was changed and in what direction
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(a) L is increased |
(b) L is decreased |
(c) R is increased |
(d) R is decreased |
A ray of light passes through an equilateral glass prism in such a manner that the angle of incidence is equal to the angle of emergence and each of these angles is equal to 3/4 of the angle of the prism. The angle of deviation is
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(a) 45° |
(b) 39° |
(c) 20° |
(d) 30° |
A real image is formed by:
Assertion : When charges are shared between any two bodies, no charge is really lost, but some loss of energy does occur.
Reason : Some energy disappears in the form of heat, sparking etc.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(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. |
The rest energy of an electron is 0.511 MeV. The electron is accelerated from rest to a velocity 0.5 c. The change in its energy will be
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(a) 0.026 MeV |
(b) 0.051 MeV |
(c) 0.079 MeV |
(d) 0.105 MeV |