- A0.7V
- B0.3
- C0.6V
- D3V
Explanation:
The junction voltage Vo for a germanium diode is 0.3 V at room temperature. This potential opposes the diffusion of electrons from n-side and holes from p-side. It is 0.7 eV for Si at room temperature.
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The rest energy of an electron is 0.511 MeV. The electron is accelerated from rest to a velocity 0.5 c. The change in its energy will be
|
(a) 0.026 MeV |
(b) 0.051 MeV |
(c) 0.079 MeV |
(d) 0.105 MeV |
Two radioactive materials
and
have decay constants 10λ and λ respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of
to that of
will be 1/e after a time
|
(a) 1/(10 λ) |
(b) 1/(11 λ) |
(c) 11(10 λ) |
(d) 1(9 λ) |
On giving 220V to a resistor the power dissipated is 40W then value of resistance is
|
(a) 1210 W |
(b) 2000 W |
(c) 1000 W |
(d) None of these |
The temperature coefficient of resistance of a semiconductor
|
(a) Is always positive |
(b) Is always negative |
|
(c) Is zero |
(d) May be positive or negative or zero |
A stream of electrons is projected horizontally to the right. A straight conductor carrying a current is supported parallel to electron stream and above it. If the current in the conductor is from left to right then what will be the effect on electron stream
|
(a) The electron stream will be pulled upward |
|
(b) The electron stream will be pulled downward |
|
(c) The electron stream will be retarted |
|
(d) The electron beam will be speeded up towards the right |
Which of the following is true for number of spectral lines in going form Layman series to Pfund series
|
(a) Increases |
(b) Decreases |
|
(c) Unchanged |
(d) May decreases or increases |
The magnitude of electric field E in the annular region of a charged cylindrical capacitor
|
(a) Is same throughout |
|
(b) Is higher near the outer cylinder than near the inner cylinder |
|
(c) Varies as 1/r, where r is the distance from the axis |
|
(d) Varies as |
The phenomenon due to which a ray of light .......... from its path while travelling from one optical medium to another optical medium is called refraction.