- AElectric discharge causes damage to semicondcutors.
- BThere are too many electrons.
- CA co-valent bond is broken due to thermal energy, the removal of one electron leaves a vacancy.
- DNone of these
Explanation:
Holes are created when a co-valent bond is broken due to thermal energy. The removal of one electron leaves a vacancy known as a hole.
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The work function of metal is 1 eV. Light of wavelength 3000 Å is incident on this metal surface. The velocity of emitted photo-electrons will be
|
(a) 10 m/sec |
(b) 1 |
(c) |
(d) |
If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be
|
(a) 0.2 % |
(b) 2 % |
(c) 1 % |
(d) 0.1 % |
A magnet is made to oscillate with a particular frequency, passing through a coil as shown in figure. The time variation of the magnitude of e.m.f. generated across the coil during one cycle is

(a)
|
(b)
|
(c)
|
(d)
|
The basic magnetization curve for a ferromagnetic material is shown in figure. Then, the value of relative permeability is highest for the point
|
(a) P |
(b) Q |
(c) R |
(d) S |
A conducting circular loop of radius r carries a constant current i. It is placed in a uniform magnetic field , such that
is perpendicular to the plane of the loop. The magnetic force acting on the loop is
|
(a) ir |
(b) 2πri |
(c) Zero |
(d) πri |
The earth's magnetic field at a certain place has a horizontal component 0.3 Gauss and the total strength 0.5 Gauss. The angle of dip is
|
(a) |
(b) |
(c) |
(d) |