The electrical circuits used to get smooth d.c. output from a rectifier circuit is called
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(a) Filter |
(b) Amplifier |
(c) Full wave rectifier |
(d) Oscillator |
(b) Amplifier
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The ionization potential for second He electron is
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(a) 13.6 eV |
(b) 27.2 eV |
(c) 54.4 eV |
(d) 100 eV |
The electric resistance of a certain wire of iron is R. If its length and radius are both doubled, then
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(a) The resistance will be doubled and the specific resistance will be halved |
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(b) The resistance will be halved and the specific resistance will remain unchanged |
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(c) The resistance will be halved and the specific resistance will be doubled |
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(d) The resistance and the specific resistance, will both remain unchanged |
The phenomena involved in the reflection of radiowaves by ionosphere is similar to:
The electric field due to a uniformly charged sphere of radius R as a function of the distance from its centre is represented graphically by
|
(a)
|
(b)
|
(c)
|
(d)
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Which of the following logic gate is an universal gate
|
(a) OR |
(b) NOT |
(c) AND |
(d) NOR |
Assertion : There is no current in the metals in the absence of electric field.
Reason : Motion of free electron are randomly.
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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 diagram below shows two coils A and B placed parallel to each other at a very small distance. Coil A is connected to an ac supply. G is a very sensitive galvanometer. When the key is closed
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(a) Constant deflection will be observed in the galvanometer for 50 Hz supply |
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(b) Visible small variations will be observed in the galvanometer for 50 Hz input |
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(c) Oscillations in the galvanometer may be observed when the input ac voltage has a frequency of 1 to 2 Hz |
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(d) No variation will be observed in the galvanometer even when the input ac voltage is 1 or 2 Hz |
