A triode whose mutual conductance is 2.5 m A/volt and anode resistance is 20 kilo ohm, is used as an amplifier whose amplification is 10. The resistance connected in plate circuit will be
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(a) 1 kW |
(b) 5 kW |
(c) 10 kW |
(d) 20 kW |
(b) 5 kW
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When the angle of incidence on a material is 60°, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in ms–1)
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(a) 3 |
(b) |
(c) |
(d) 0.5 |
The current is flowing in south direction along a power line. The direction of magnetic field above the power line (neglecting earth's field) is
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(a) South |
(b) East |
(c) North |
(d) West |
A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have
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(a) Resistances in the ratio of 4 : 1 |
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(b) Maximum current ratings in the ratio of 1 : 4 |
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(c) Resistances in the ratio of 2 : 1 |
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(d) Maximum current ratings in the ratio of 1 : 2 |
The valence band and conduction band of a solid overlap at low temperature, the solid may be
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(a) A metal |
(b) A semiconductor |
(c) An insulator |
(d) None of these |
Assertion : Bending a wire does not effect electrical resistance.
Reason : Resistance of wire is proportional to resistivity of material.
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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. |
