A triode whose mutual conductance is 2.5 m A/volt and anode resistance is 20 kilo ohm, is used as an amplifier whose amplification is 10. The resistance connected in plate circuit will be
|
(a) 1 kW |
(b) 5 kW |
(c) 10 kW |
(d) 20 kW |
(b) 5 kW
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On passing the current in water voltameter, the hydrogen
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(a) Liberated at anode |
(b) Liberated at cathode |
|
(c) Does not liberate |
(d) Remains in the solution |
Two particles each of mass m and charge q are attached to the two ends of a light rigid rod of length 2R. The rod is rotated at constant angular speed about a perpendicular axis passing through its centre. The ratio of the magnitudes of the magnetic moment of the system and its angular momentum about the centre of the rod is
|
(a) |
(b) |
(c) |
(d) |
Which of the following is correct
|
(a) Ammeter has low resistance and is connected in series |
|
(b) Ammeter has low resistance and is connected in parallel |
|
(c) Voltmeter has low resistance and is connected in parallel |
|
(d) None of the above |
A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now swings through the field, the pendulum will
|
(a) Keep oscillating with the old time period |
|
(b) Keep oscillating with a smaller time period |
|
(c) Keep oscillating with a larger time period |
|
(d) Come to rest very soon |
Masses of 3 wires of same metal are in the ratio 1 : 2 : 3 and their lengths are in the ratio 3 : 2 : 1. The electrical resistances are in ratio
|
(a) 1 : 4 : 9 |
(b) 9 : 4 : 1 |
(c) 1 : 2 : 3 |
(d) 27 : 6 : 1 |
A glass rod rubbed with silk is used to charge a gold leaf electroscope and the leaves are observed to diverge. The electroscope thus charged is exposed to X-rays for a short period. Then
|
(a) The divergence of leaves will not be affected |
|
(b) The leaves will diverge further |
|
(c) The leaves will collapse |
|
(d) The leaves will melt |
The period of oscillations of a magnet is 2 sec. When it is remagnetised so that the pole strength is 4 times its period will be
|
(a) 4 sec |
(b) 2 sec |
(c) 1 sec |
(d) 1/2 sec |
The equivalent resistance of the following diagram A and B is
|
(a) |
(b) 9 W |
(c) 6 W |
(d) None of these |
