In a triode amplifier, the value of maximum gain is equal to
|
(a) Half the amplification factor |
(b) Amplification factor |
|
(c) Twice the amplification factor |
(d) Infinity |
(b) Amplification factor
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Orbital acceleration of electron is
|
(a) |
(b) |
(c) |
(d) |
Cathode rays are similar to visible light rays in that
|
(a) They both can be deflected by electric and magnetic fields |
|
(b) They both have a definite magnitude of wavelength |
|
(b) They both have a definite magnitude of wavelength |
|
(d) They both can expose a photographic plate |
The galaxies are moving away from each other. It is explained by
|
(a) White dwarf star |
(b) Red shift |
(c) Neutron star |
(d) None of these |
Newton postulated his corpuscular theory on the basis of
|
(a) Newton’s rings |
(b) Colours of thin films |
|
(c) Rectilinear propagation of light |
(d) Dispersion of white light |
When a glass rod is rubbed with silk, it
|
(a) Gains electrons from silk |
(b) Gives electrons to silk |
|
(c) Gains protons from silk |
(d) Gives protons to silk |
A coil has 1,000 turns and 500 cm2 as its area. The plane of the coil is placed at right angles to a magnetic induction field of 2
. The coil is rotated through 180° in 0.2 seconds. The average e.m.f. induced in the coil, in milli-volts, is
|
(a) 5 |
(b) 10 |
(c) 15 |
(d) 20 |
The frequency of a light ray is 6 
. Its frequency when it propagates in a medium of refractive index 1.5, will be
|
(a) 1.67 |
(b) 9.10 |
(c) 6 |
(d) 4 |
A current carrying long solenoid is placed on the ground with its axis vertical. A proton is falling along the axis of the solenoid with a velocity v. When the proton enters into the solenoid, it will
|
(a) Be deflected from its path |
|
(b) Be accelerated along the same path |
|
(c) Be decelerated along the same path |
|
(d) Move along the same path with no change in velocity |
