Two coherent sources separated by distance d are radiating in phase having wavelength l. A detector moves in a big circle around the two sources in the plane of the two sources. The angular position of n = 4 interference maxima is given as
|
(a) |
(b) |
(c) |
(d) |
(b) 
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A charge of 
is placed on each of the 64 identical drops of radius 2cm. They are then combined to form a bigger drop. Find its potential
|
(a) 7.2 |
(b) 7.2 |
(c) 1.44 |
(d) 1.44 |
In NPN transistor the collector current is 10 mA. If 90% of electrons emitted reach the collector, then
|
(a) Emitter current will be 9 mA |
(b) Emitter current will be 11.1 mA |
|
(c) Base current will be 0.1 mA |
(d) Base current will be 0.01 mA |
In a triode valve
|
(a) If the grid voltage is zero then plate current will be zero |
|
(b) If the temperature of filament is doubled, then the thermionic current will also be doubled |
|
(c) If the temperature of filament is doubled, then the thermionic current will nearly be four times |
|
(d) At a definite grid voltage the plate current varies with plate voltage according to Ohm’s law |
The de-Broglie wavelength associated with the particle of mass m moving with velocity v is
|
(a) h/mv |
(b) mv/h |
(c) mh/v |
(d) m/hv |
The image formed by a convex mirror of focal length 30 cm is a quarter of the size of the object. The distance of the object from the mirror is
|
(a) 30 cm |
(b) 90 cm |
(c) 120 cm |
(d) 60 cm |
Orbital acceleration of electron is
|
(a) |
(b) |
(c) |
(d) |
The thermocouple is based on the principle of
|
(a) Seebeck effect |
(b) Thomson effect |
(c) Peltier effect |
(d) Joule effect |
