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The state of the energy gained by valance electrons when the temperature is raised or when electric field is applied is called as
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(a) Valance band |
(b) Conduction band |
(c) Forbidden band |
(d) None of these |
Which of the following is not an application of eddy currents
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(a) Induction furnace |
(b) Galvanometer damping |
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(c) Speedometer of automobiles |
(d) X-ray crystallography |
Assertion : The possibility of an electric bulb fusing is higher at the time of switching ON and OFF
Reason : Inductive effects produce a surge at the time of switch ON and OFF
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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. |
Light is an electromagnetic wave. Its speed in vacuum is given by the expression
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(a) |
(b) |
(c) |
(d) |
The alloys constantan and manganin are used to make standard resistance due to they have
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(a) Low resistivity |
(b) High resistivity |
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(c) Low temperature coefficient of resistance |
(d) Both (b) and (c) |
A wire of length 1 m is moving at a speed of 2ms–1 perpendicular to its length and a homogeneous magnetic field of 0.5 T. The ends of the wire are joined to a circuit of resistance 6 W. The rate at which work is being done to keep the wire moving at constant speed is
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(a) |
(b) |
(c) |
(d) 1W |
