A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by vP and vQ respectively, then
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(a) vP = vQ |
(b) vP = |
(c) vP = |
(d) vP = 2 vQ |
(c) vP = 
vQ
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The example for non-ohmic resistance is
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(a) Copper wire |
(b) Carbon resistance |
(c) Diode |
(d) Tungston wire |
In beta decay
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(a) The parent and daughter nuclei have same number of protons |
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(b) The daughter nucleus has one proton less than the parent nucleus |
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(c) The daughter nucleus has one proton more than the parent nucleus |
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(d) The daughter nucleus has one neutron more than the parent nucleus |
Assertion : Charge is invariant.
Reason : Charge does not depends on speed of frame of reference.
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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. |
How many calories of heat will be produced approximately in a 210 watt electric bulb in 5 minutes
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(a) 80000 cal |
(b) 63000 cal |
(c) 1050 cal |
(d) 15000 cal |
The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by
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(a) 10 volt |
(b) 4 volt |
(c) 40 volt |
(d) 100 volt |
For a material, the refractive indices for red, violet and yellow colour light are respectively 1.52, 1.64 and 1.60. The dispersive power of the material is
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(a) 2 |
(b) 0.45 |
(c) 0.2 |
(d) 0.045 |
