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A wire of resistor R is bent into a circular ring of radius r. Equivalent resistance between two points X and Y on its circumference, when angle XOY is a, can be given by
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(a) |
(b) |
(c) R (2 p – a) |
(d) |
Assertion : The resistivity of a semiconductor increases with temperature.
Reason : The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing it's resistivity.
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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. |
On an electric heater 220 volt and 1100 watt are marked. On using it for 4 hours, the energy consumed in kWh will be
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(a) 2 |
(b) 4.4 |
(c) 6 |
(d) 8 |
The chromatic Aberration in lenses becomes due to
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(a) Disimilarity of main axis of rays |
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(b) Disimilarity of radii of curvature |
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(c) Variation of focal length of lenses with wavelength |
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(d) None of these |
The equivalent quantity of mass in electricity is
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(a) Charge |
(b) Potential |
(c) Inductance |
(d) Current |
