When a current passes through the junction of two different metals, evolution or absorption of heat at the junction is known as
|
(a) Joule effect |
(b) Seebeck effect |
(c) Peltier effect |
(d) Thomson effect |
(c) Peltier effect
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If 
are the lengths of the emitter, base and collector of a transistor then
|
(a) |
(b) |
(c) |
(d) |
In L-R circuit, for the case of increasing current, the magnitude of current can be calculated by using the formula
|
(a) |
(b) |
(c) |
(d) |
What is the path difference of destructive interference
|
(a) nl |
(b) n(λ + 1) |
(c) |
(d) |
Coating of strontium oxide on Tungsten cathode in a valve is good for thermionic emission because
|
(a) Work function decreases |
|
(b) Work function increases |
|
(c) Conductivity of cathode increases |
|
(d) Cathode can be heated to high temperature |
An electron and a proton with equal momentum enter perpendicularly into a uniform magnetic field, then
|
(a) The path of proton shall be more curved than that of electron |
|
(b) The path of proton shall be less curved than that of electron |
|
(c) Both are equally curved |
|
(d) Path of both will be straight line |
