For the diode, the characteristic curves are given at different temperature. The relation between the temperatures is
(a) 
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(b) 
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(c) 
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(d) None of the above |
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A conducting sphere of radius 10cm is charged 10μC. Another uncharged sphere of radius 20 cm is allowed to touch it for some time. After that if the sphere are separated, then surface density of charges, on the spheres will be in the ratio of
|
(a) 1 : 4 |
(b) 1 : 3 |
(c) 2 : 1 |
(d) 1 : 1 |
The fact that electric charges are integral multiples of the fundamental electronic charge was proved experimentally by
|
(a) Planck |
(b) J.J. Thomson |
(c) Einstein |
(d) Millikan |
The number of dry cells, each of e.m.f. 1.5 volt and internal resistance 0.5 ohm that must be joined in series with a resistance of 20 ohm so as to send a current of 0.6 ampere through the circuit is
|
(a) 2 |
(b) 8 |
(c) 10 |
(d) 12 |
Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current
(a)
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(b)
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(c)
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(d)
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In the circuit shown, A and V are ideal ammeter and voltmeter respectively. Reading of the voltmeter will be
|
(a) 2 V |
(b) 1 V |
(c) 0.5 V |
(d) Zero |
Assertion : Inductance coil are made of copper.
Reason : Induced current is more in wire having less resistance.
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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. |
Nuclear fusion is common to the pair
| (a) Thermonuclear reactor, uranium based nuclear reactor |
| (b) Energy production in sun, uranium based nuclear reactor |
| (c) Energy production in sun, hydrogen bomb |
| (d) Disintegration of heavy nuclei, hydrogen bomb |