When the modulating frequency is doubled, the modulation index is halved and the modulating voltage remains constant, the modulation system is
|
(a) Amplitude modulation |
(b) Phase modulation |
|
(c) Frequency modulation |
(d) All of the above |
(c) Frequency modulation
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A galvanometer can be used as a voltmeter by connecting a
|
(a) High resistance in series |
(b) Low resistance in series |
|
(c) High resistance in parallel |
(d) Low resistance in parallel |
64 drops of mercury each charged to a potential of 10V. They are combined to form one bigger drop. The potential of this drop will be (Assume all the drops to be spherical)
|
(a) 160 V |
(b) 80 V |
(c) 10 V |
(d) 640 V |
Davission and Germer experiment proved
|
(a) Wave nature of light |
(b) Particle nature of light |
|
(c) Both (a) and (b) |
(d) Neither (a) nor (b) |
Two long parallel wires P and Q are both perpendicular to the plane of the paper with distance 5 m between them. If P and Q carry current of 2.5 amp and 5 amp respectively in the same direction, then the magnetic field at a point half way between the wires is
|
(a) |
(b) |
(c) |
(d) |
Retina of eye acts like ........ of camera
|
(a) Shutter |
(b) Film |
(c) Lens |
(d) None of these |
