The magnetic susceptibility does not depend upon the temperature in
|
(a) Ferrite substances |
(b) Ferromagnetic substances |
|
(c) Diamagnetic substances |
(d) Paramagnetic substances |
(c) Diamagnetic substances
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Which of the following is an amorphous solid
|
(a) Glass |
(b) Diamond |
(c) Salt |
(d) Sugar |
A heavenly body is receding from earth such that the fractional change in l is 1, then its velocity is
|
(a) C |
(b) |
(c) |
(d) |
Assertion : The energy of charged particle moving in a uniform magnetic field does not change.
Reason : Work done by magnetic field on the charge is zero.
|
(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. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
A simple pendulum of period T has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will
|
(a) Remains equal to T |
(b) Less than T |
|
(c) Greater than T |
(d) Infinite |
Ray optics is valid, when characteristic dimensions are
|
(a) Of the same order as the wavelength of light |
|
(b) Much smaller than the wavelength of light |
|
(c) Of the order of one millimetre |
|
(d) Much larger than the wavelength of light |
Before the saturation state of a diode at the plate voltages of 400 V and 200 V respectively the currents are i1 and i2 respectively. The ratio i1/i2 will be
(a) 
|
(b) 2
|
(c) 2 | (d) 1/2 |
Assertion : Magnetic flux can produce induced e.m.f.
Reason : Faraday established induced e.m.f. experimentally.
|
(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. |
|
(c) If assertion is true but reason is false. |
|
(d) If assertion is false but reason is true. |
