- ACu.
- BConstantan.
- CTin-lead alloy.
- DNichrome.
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A sinusoidal voltage of peak value 200 volt is connected to a diode and resistor R in the circuit shown so that half wave rectification occurs. If the forward resistance of the diode is negligible compared to R the rms voltage (in volt) across R is approximately

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(a) 200 |
(b) 100 |
(c) |
(d) 280 |
Consider an extended object immersed in water contained in a plane trough. When seen from close to the edge of the trough the object looks distorted because:
Assertion : Penetrating power of X-rays increases with the increasing the wavelength.
Reason : The penetrating power of X-rays increases with the frequency of X-rays.
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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 assertion is false but reason is true. |
The resistance of a galvanometer is 25 ohm and it requires 50μA for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is
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(a) 2.5 |
(b) 1.25 |
(c) 0.05 ohm |
(d) 2.5 ohm |
The magnetic induction in air at a distance d from an isolated point pole of strength m unit will be
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(a) |
(b) |
(c) md |
(d) |