The phenomenon of interference is shown by
|
(a) Longitudinal mechanical waves only |
(b) Transverse mechanical waves only |
|
(c) Electromagnetic waves only |
(d) All the above types of waves |
(d) All the above types of waves
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A hollow sphere of charge does not produce an electric field at any
|
(a) Point beyond 2 metres |
(b) Point beyond 10 metres |
|
(c) Interior point |
(d) Outer point |
It is desired to photograph the image of an object placed at a distance of 3m from the plane mirror. The camera which is at a distance of 4.5 m from the mirror should be focussed for a distance of
| (a) 3m | (b) 4.5m | (c) 6m | (d) 7.5 m |
The wavelength 
of the 
line of characteristic X-ray spectra varies with atomic number approximately
(a)
|
(b) 
|
(c) 
|
(d)  
|
A common emitter amplifier is designed with NPN transistor (a = 0.99). The input impedance is 1 KW and load is 10 KW. The voltage gain will be
|
(a) 9.9 |
(b) 99 |
(c) 990 |
(d) 9900 |