In the nuclear reaction is
|
(a) |
(b) |
(c) |
(d) |
In the nuclear reaction is
|
(a) |
(b) |
(c) |
(d) |
(c)
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For the transistor circuit shown below, if b = 100, voltage drop between emitter and base is 0.7 V then value of VCE will be
|
(a) 10 V |
(b) 5 V |
(c) 13 V |
(d) 0 V |
When radiation is incident on a photoelectron emitter, the stopping potential is found to be 9 volts. If e/m for the electron is 1.8
the maximum velocity of the ejected electrons is
|
(a) 6 |
(b) 8 |
(c) 1.8 |
(d) 1.8 |
In a region of uniform magnetic induction
, a circular coil of radius 30 cm and resistance
ohm is rotated about an axis which is perpendicular to the direction of B and which forms a diameter of the coil. If the coil rotates at 200 rpm the amplitude of the alternating current induced in the coil is
|
(a) |
(b) 30 mA |
(c) 6 mA |
(d) 200 mA |
The image distance of an object placed 10 cm in front of a thin lens of focal length + 5 cm is
|
(a) 6.5 cm |
(b) 8.0 cm |
(c) 9.5 cm |
(d) 10.0 cm |
In an amplifier the load resistance is equal to the plate resistance (
. The voltage amplification is equal to
|
(a) μ |
(b) 2 μ |
(c) μ/2 |
(d) μ/4 |
The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of 5Ω the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell
|
(a) 1.2 Ω |
(b) 1.3 Ω |
(c) 1.1 Ω |
(d) 1.4 Ω |
There is a current of 20 amperes in a copper wire of square metre area of cross-section. If the number of free electrons per cubic metre is
, then the drift velocity is
|
(a) 125 |
(b) 12.5 |
(c) 1.25 |
(d) 1.25 |
The brightness of a bulb will be reduced, if a resistance is connected in
|
(a) Series with it |
(b) Parallel with it |
|
(c) Series or parallel with it |
(d) Brightness of the bulb cannot be reduced |