- AStatic electricity.
- BCurrent electricity.
- CReflection of light.
- DRefraction of light.
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Dielectric constant of pure water is 81. Its permittivity will be
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(a) |
(b) 8.86 |
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(c) 1.02 |
(d) Cannot be calculated |
A symmetric double convex lens is cut in two equal parts by a plane perpendicular to the principal axis. If the power of the original lens was 4D, the power of a cutlens will be:
Assertion : The cloud in sky generally appear to be whitish.
Reason : Diffraction due to clouds is efficient in equal measure at all wavelengths.
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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 ratio of charge to potential of a body is known as
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(a) Capacitance |
(b) Conductance |
(c) Inductance |
(d) Resistance |
Consider an NPN transistor amplifier in common-emitter configuration. The current gain of the transistor is 100. If the collector current changes by 1 mA, what will be the change in emitter current
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(a) 1.1 mA |
(b) 1.01 mA |
(c) 0.01 mA |
(d) 10 mA |
Resistivity of a semiconductor depends on
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(a) Shape of semiconductor |
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(b) Atomic nature of semiconductor |
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(c) Length of semiconductor |
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(d) Shape and atomic nature of semiconductor |