- ADielectric.
- BDielectric constant of the substance.
- CPermittivity.
- DPermiability.
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Lateral displacement of the emergent ray of light increases with:
Two bulbs are in parallel and they together consume 48 W from a battery of 6 V. The resistance of each bulb is
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(a) 0.67 Ω |
(b) 3.0 Ω |
(c) 4.0 Ω |
(d) 1.5 Ω |
Which impurity is doped in Si to form N-type semi-conductor?
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(a) Al |
(b) B |
(c) As |
(d) None of these |
Assertion : The magnetic filed at the ends of a very long current carrying solenoid is half of that at the center.
Reason : If the solenoid is sufficiently long, the field within it is uniform.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Electric power is transmitted over long distances through conducting wires at high voltage because
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(a) High voltage travels faster |
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(b) Power loss is large |
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(c) Power loss is less |
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(d) Generator produced electrical energy at a very high voltage |
Compton effect shows that
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(a) X-rays are waves |
(b) X-rays have high energy |
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(c) X-rays can penetrate matter |
(d) Photons have momentum |

Serious draw back of the semiconductor device is
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(a) They cannot be used with high voltage |
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(b) They pollute the environment |
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(c) They are costly |
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(d) They do not last for long time |