Indicate which one of the following system is digital
|
(a) Pulse position modulation |
(b) Pulse code modulation |
|
(c) Pulse width modulation |
(d) Pulse amplitude modulation |
(b) Pulse code modulation
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Photo cell is a device to
|
(a) Store photons |
|
(b) Measure light intensity |
|
(c) Convert photon energy into mechanical energy |
|
(d) Store electrical energy for replacing storage batteries |
Which of the following is not a mode of radioactive decay
|
(a) Positron emission |
(b) Electron capture |
(c) Fusion |
(d) Alpha decay |
The net resistance of a voltmeter should be large to ensure that
|
(a) It does not get overheated |
|
(b) It does not draw excessive current |
|
(c) It can measure large potential difference |
|
(d) It does not appreciably change the potential difference to be measured |
A man runs towards a mirror at a speed 15 m/s The speed of the image relative to the man is
|
(a) 15 |
(b) 30 |
(c) 35 |
(d) 20 |
A particle of mass M and charge Q moving with velocity 
describes a circular path of radius R when subjected to a uniform transverse magnetic field of induction B. The work done by the field when the particle completes one full circle is
|
(a) BQv2πR |
(b) |
(c) Zero |
(d) BQ |
