- AIt measures potential in open circuit.
- BIt uses sensitive galvanometer for null deflection.
- CIt uses high resistance potentiometer wire.
- DIt measures potential in closed circuit.
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A common emitter amplifier is designed with NPN transistor (a = 0.99). The input impedance is 1 KW and load is 10 KW. The voltage gain will be
|
(a) 9.9 |
(b) 99 |
(c) 990 |
(d) 9900 |
The ratio of the intensity at the centre of a bright fringe to the intensity at a point one-quarter of the distance between two fringe from the centre is
|
(a) 2 |
(b) 1/2 |
(c) 4 |
(d) 16 |
Lenz's law is consequence of the law of conservation of
|
(a) Charge |
(b) Momentum |
(c) Mass |
(d) Energy |
In hydrogen atom, an electron is revolving in the orbit of radius 0.53 with 6.6
rotations/second. Magnetic field produced at the centre of the orbit is
|
(a) 0.125 |
(b) 1.25 |
(c) 12.5 |
(d) 125 |
A 50 volt potential difference is suddenly applied to a coil with
henry and R = 180 ohm. The rate of increase of current after 0.001 second is
|
(a) 27.3 amp/sec |
(b) 27.8 amp/sec |
(c) 2.73 amp/sec |
(d) None of the above |
A current of 1.5 A flows through a copper voltameter. The thickness of copper deposited on the electrode surface of area in 20 minutes will be (Density of copper = 9000
and E.C.E. of copper = 0.00033 g/C)
|
(a) 2.6 |
(b) 2.6 |
(c) 1.3 |
(d) 1.3 |
Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is
|
(a) |
(b) |
(c) |
(d) |