P-type semiconductors are made by adding impurity element
|
(a) As |
(b) P |
(c) B |
(d) Bi |
P-type semiconductors are made by adding impurity element
|
(a) As |
(b) P |
(c) B |
(d) Bi |
(c) B
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The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by
|
(a) 10 volt |
(b) 4 volt |
(c) 40 volt |
(d) 100 volt |
A thermo couple is formed by two metals X and Y metal X comes earlier to Y in Seebeck series. If temperature of hot junction increases beyond the temperature of inversion. Then direction of current in thermocouple will so
|
(a) X to Y through cold junction |
(b) X to Y through hot junction |
|
(c) Y to X through cold junction |
(d) Both (b) and (c) |
The electromagnetic waves travel with a velocity
|
(a) Equal to velocity of sound |
(b) Equal to velocity of light |
|
(c) Less than velocity of light |
(d) None of these |
A circular coil of radius R carries an electric current. The magnetic field due to the coil at a point on the axis of the coil located at a distance r from the centre of the coil, such that r >> R, varies as
|
(a) |
(b) |
(c) |
(d) |
Figures below show regular hexagons, with charges at the vertices. In which of the following cases the electric field at the centre is not zero
