Which of the following rays has the maximum frequency
|
(a) Gamma rays |
(b) Blue light |
(c) Infrared rays |
(d) Ultraviolet rays |
Which of the following rays has the maximum frequency
|
(a) Gamma rays |
(b) Blue light |
(c) Infrared rays |
(d) Ultraviolet rays |
(a) Gamma rays
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In a mean life of a radioactive sample
|
(a) About 1/3 of substance disintegrates |
|
(b) About 2/3 of the substance disintegrates |
|
(c) About 90% of the substance disintegrates |
|
(d) Almost all the substance disintegrates |
Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 kHz producing 50% modulation. The lower and upper side-band frequencies in kHz are
|
(a) 1490, 1510 |
(b) 1510, 1490 |
(c) |
(d) |
For a transistor, the current amplification factor is 0.8. The transistor is connected in common emitter configuration. The change in the collector current when the base current changes by 6 mA is
|
(a) 6 mA |
(b) 4.8 mA |
(c) 24 mA |
(d) 8 mA |
The radius of two metallic spheres A and B are and
respectively (
. They are connected by a thin wire and the system is given a certain charge. The charge will be greater
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(a) On the surface of the sphere B |
(b) On the surface of the sphere A |
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(c) Equal on both |
(d) Zero on both |
Two spheres A and B of radius ‘a’ and ‘b’ respectively are at same electric potential. The ratio of the surface charge densities of A and B is
|
(a) |
(b) |
(c) |
(d) |