In the given figure, potential difference between A and B is
|
(a) 0 |
(b) 5 volt |
(c) 10 volt |
(d) 15 volt |
In the given figure, potential difference between A and B is
|
(a) 0 |
(b) 5 volt |
(c) 10 volt |
(d) 15 volt |
(c) 10 volt
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In the absence of an electric field, the mean velocity of free electrons in a conductor at absolute temperature (T) is:
A coil carrying electric current is placed in uniform magnetic field, then
|
(a) Torque is formed |
(b) E.M.f. is induced |
|
(c) Both (a) and (b) are correct |
(d) None of these |

A very small magnet is placed in the magnetic meridian with its south pole pointing north. The null point is obtained 20 cm away from the centre of the magnet. If the earth's magnetic field (horizontal component) at this point be 0.3 gauss, the magnetic moment of the magnet is
|
(a) 8.0 |
(b) 1.2 |
(c) 2.4 |
(d) 3.6 |
The amount of charge required to liberate 9 gm of aluminium (atomic weight = 27 and valency = 3) in the process of electrolysis is (Faraday's number = 96500 coulombs/gm equivalent)
|
(a) 321660 coulombs |
(b) 69500 coulombs |
(c) 289500 coulombs |
(d) 96500 coulombs |
A NPN transistor conducts when
|
(a) Both collector and emitter are positive with respect to the base |
|
(b) Collector is positive and emitter is negative with respect to the base |
|
(c) Collector is positive and emitter is at same potential as the base |
|
(d) Both collector and emitter are negative with respect to the base |
In an L–R circuit connected to a battery the rate at which energy is stored in the inductor is plotted against time during the growth of the current in the circuit. Which of the following best represents the resulting curve
|
(a)
|
(b)
|
(c)
|
(d)
|