- ATo detect presence of charge on a body.
- BTo determine the nature of charge on a body.
- CTo measure the exact amount of charge on a body.
- DFor both A and B.
Explanation:
Electroscope is a device which is use to detect whether a body is carrying charge and also to detect the nature of charge on the body.
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Assertion : In everyday life the Doppler’s effect is observed readily for sound waves than light waves.
Reason : Velocity of light is greater than that of sound.
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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 plane convex lens is made of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is
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(a) 50 cm |
(b) 100 cm |
(c) 200 cm |
(d) 400 cm |
A coil of self inductance 50 henry is joined to the terminals of a battery of e.m.f. 2 volts through a resistance of 10 ohm and a steady current is flowing through the circuit. If the battery is now disconnected, the time in which the current will decay to 1/e of its steady value is
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(a) 500 seconds |
(b) 50 seconds |
(c) 5 seconds |
(d) 0.5 seconds |
A uniform wire of resistance R is uniformly compressed along its length, until its radius becomes n times the original radius. Now resistance of the wire becomes
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(a) |
(b) |
(c) |
(d) nR |
The unit of magnetic flux is
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(a) |
(b) Weber |
(c) Henry |
(d) Ampere/m |
Three capacitors each of capacity 4μF are to be connected in such a way that the effective capacitance is 6 μF. This can be done by
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(a) Connecting them in parallel |
(b) Connecting two in series and one in parallel |
|
(c) Connecting two in parallel and one in series |
(d) Connecting all of them in series |
