The capacity of a parallel plate condenser is C. Its capacity when the separation between the plates is halved will be
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(a) 4 C |
(b) 2C |
(c) |
(d) |
(b) 2C
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If the direction of the initial velocity of the charged particle is neither along nor perpendicular to that of the magnetic field, then the orbit will be
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(a) A straight line |
(b) An ellipse |
(c) A circle |
(d) A helix |
In a PNP transistor working as a common-base amplifier, current gain is 0.96 and emitter current is 7.2 mA. The base current is
|
(a) 0.4 mA |
(b) 0.2 mA |
(c) 0.29 mA |
(d) 0.35 mA |
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. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
Spherical aberration in a lens
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(a) Is minimum when most of the deviation is at the first surface |
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(b) Is minimum when most of the deviation is at the second surface |
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(c) Is minimum when the total deviation is equally distributed over the two surface |
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(d) Does not depend on the above consideration |
Why the current does not rise immediately in a circuit containing inductance
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(a) Because of induced emf |
(b) Because of high voltage drop |
|
(c) Because of low power consumption |
(d) Because of Joule heating |
The deflection in a moving coil galvanometer is
|
(a) Directly proportional to the torsional constant |
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(b) Directly proportional to the number of turns in the coil |
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(c) Inversely proportional to the area of the coil |
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(d) Inversely proportional to the current flowing |
Assertion : Electric appliances with metallic body have three connections, whereas an electric bulb has a two pin connection.
Reason : Three pin connections reduce heating of connecting wires.
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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. |
