In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is
|
(a) 0.4 mA |
(b) 0.2 mA |
(c) 0.29 mA |
(d) 0.35 mA |
(c) 0.29 mA
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In a moving coil galvanometer, the deflection of the coil θ is related to the electrical current i by the relation
|
(a) i ∝ tanθ |
(b) i ∝ θ |
(c) i ∝ |
(d) i ∝ |
In the Young's double slit experiment, the ratio of intensities of bright and dark fringes is 9. This means that
|
(a) The intensities of individual sources are 5 and 4 units respectively |
|
(b) The intensities of individual sources are 4 and 1 units respectively |
|
(c) The ratio of their amplitudes is 2 |
|
(d) b, c |
In the CB mode of a transistor, when the collector voltage is changed by 0.5 volt. The collector current changes by 0.05 mA. The output resistance will be
|
(a) 10 kW |
(b) 20 kW |
(c) 5 kW |
(d) 2.5 kW |
A metal conductor of length 1m rotates vertically about one of its ends at angular velocity 5 radians per second. If the horizontal component of earth's magnetic field is 0.2 
, then the e.m.f. developed between the two ends of the conductor is
|
(a) 5mV |
(b) 5 |
(c) 50 mV |
(d) 50 μV |
When a plane mirror is placed horizontally on a level ground at a distance of 60 m from the foot of a tower, the top of the tower and its image in the mirror subtend an angle of 90° at the eye. The height of the tower will be
| (a) 30 m | (b) 60 m | (c) 90 m | (d) 120 m |
Orbital acceleration of electron is
|
(a) |
(b) |
(c) |
(d) |
$\frac{\text{k}_1}{\text{k}_2}$
$\sqrt{\frac{\text{k}_1}{\text{k}_2}}$
$\frac{\text{k}_2}{\text{k}_1}$
$\sqrt{\frac{\text{k}_2}{\text{k}^1}}$
The graph between the instantaneous concentration (N) of a radioactive element and time (t) is
|
(a)
|
(b)
|
(c)
|
(d)
|
