Assertion : NOT gate is also called inverter circuit.
Reason : NOT gate inverts the input order.
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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. |
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
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Assertion : The temperature coefficient of resistance is positive for metals and negative for p-type semiconductor.
Reason : The effective charge carriers in metals are negatively charged whereas in p-type semiconductor they are positively charged.
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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. |
A straight wire of length (
metre is carrying a current of 2A and the magnetic field due to it is measured at a point distant 1 cm from it. If the wire is to be bent into a circle and is to carry the same current as before, the ratio of the magnetic field at its centre to that obtained in the first case would be
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(a) 50 : 1 |
(b) 1 : 50 |
(c) 100 : 1 |
(d) 1 : 100 |
The bending of beam of light around corners of obstacles is called
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(a) Reflection |
(b) Diffraction |
(c) Refraction |
(d) Interference |
N identical spherical drops charged to the same potential V are combined to form a big drop. The potential of the new drop will be
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(a) V |
(b) V/N |
(c) V × N |
(d) V × |
The magnetic field at the centre of a circular coil of radius r carrying current I is 
. The field at the centre of another coil of radius 2 r carrying same current I is 
. The ratio 
is
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(a) |
(b) 1 |
(c) 2 |
(d) 4 |
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 |
