Serious draw back of the semiconductor device is
|
(a) They cannot be used with high voltage |
|
(b) They pollute the environment |
|
(c) They are costly |
|
(d) They do not last for long time |
(a) They cannot be used with high voltage
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In an X-rays tube, the intensity of the emitted X-rays beam is increased by
| (a) Increasing the filament current | (b) Decreasing the filament current |
|
(c) Increasing the target potential |
(d) Decreasing the target potential |
For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because
|
(a) Potentiometer is more sensitive than voltmeter |
|
(b) The resistance of potentiometer is less than voltmeter |
|
(c) Potentiometer is cheaper than voltmeter |
|
(d) Potentiometer does not take current from the circuit |
The dispersive power is maximum for the material
|
(a) Flint glass |
(b) Crown glass |
(c) Mixture of both |
(d) None of the above |
Mutual inductance of two coils can be increased by
|
(a) Decreasing the number of turns in the coils |
|
(b) Increasing the number of turns in the coils |
|
(c) Winding the coils on wooden core |
|
(d) None of the above |
Shown in the figure is a circular loop of radius r and resistance R. A variable magnetic field of induction 
is established inside the coil. If the key (K) is closed, the electrical power developed right after closing the switch is equal to
|
(a) |
(b) |
(c) |
(d) |
