Explanation:
In a capacitor of capacitance C,
$\text{V}=\frac{\text{q}}{\text{C}}$
$\Rightarrow\frac{\text{dV}}{\text{dt}}=\frac{\text{i}}{\text{C}}=\frac{1\text{A}}{1\mu\text{F}}=\frac{10^6\text{V}}{\text{s}}$
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A galvanometer coil of resistance 50 W, show full deflection of 100 μA. The shunt resistance to be added to the galvanometer, to work as an ammeter of range 10 mA is
|
(a) 5 W in parallel |
(b) 0.5 W in series |
(c) 5 W in series |
(d) 0.5 W in parallel |
The electron in the beam of a television tube move horizontally from south to north. The vertical component of the earth's magnetic field points down. The electron is deflected towards
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(a) West |
(b) No deflection |
(c) East |
(d) North to south |
Assertion : The drift velocity of electrons in a metallic wire will decrease, if the temperature of the wire is increased.
Reason : On increasing temperature, conductivity of metallic wire decreases.
|
(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. |
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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. |
In producing a pure spectrum, the incident light is passed through a narrow slit placed in the focal plane of an achromatic lens because a narrow slit:
One requires energy 
to remove a nucleon from a nucleus and an energy ‘
to remove an electron from the orbit of an atom. Then
|
(a) |
(b) |
(c) |
(d) |
The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is
|
(a) 4125 Å |
(b) 2062.5 Å |
(c) 3000 Å |
(d) 6000 Å |
When light travels from one medium into another it suffers:
