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Assertion : Silicon is preferred over germanium for making semiconductor devices.
Reason : The energy gap for germanium is more than the energy gap of silicon.
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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. |
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. |
The range of wavelength of the visible light is
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(a) 10 Å to 100 Å |
(b) 4,000 Å to 8,000 Å |
(c) 8,000 Å to 10,000 Å |
(d) 10,000 Å to 15,000 Å |
Heavy water is
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(a) Water at 4 ℃ |
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(b) Compound of deuterium and oxygen |
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(c) Compound of heavy oxygen and heavy hydrogen |
| (d) Water, in which soap does not lather |