- Ap type → n type
- Bn type → p type
- Cn Type → n type
- DNone of these
Explanation:
The holes in the covalent bonds of p-type semiconductor. They appear to move towards n-type semiconductor. Because the electrons in the covalent bonds of n-type semiconductor (not free electrons) jump towards p-type semiconductor due to plenty of holes available in the covalent bonds at p-side.
Hence, conventional current flow from p-type to n-type.
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Half-life is measured by
|
(a) Geiger-Muller counter |
(b) Carbon dating |
|
(c) Spectroscopic method |
(d) Wilson-Cloud chamber |
If in nature there may not be an element for which the principal quantum number n > 4, then the total possible number of elements will be
|
(a) 60 |
(b) 32 |
(c) 4 |
(d) 64 |
Two resistances and
when connected in series and parallel with 120 V line, power consumed will be 25 W and 100 W respectively. Then the ratio of power consumed by
to that consumed by
will be
|
(a) 1 : 1 |
(b) 1 : 2 |
(c) 2 : 1 |
(d) 1 : 4 |
Carbon dating is best suited for determining the age of fossils if their age in years is of the order of
|
(a) |
(b) |
(c) |
(d) |
A diminished virtual image can be formed only in
|
(a) Plane mirror |
(b) A concave mirror |
|
(c) A convex mirror |
(d) Concave-parabolic mirror |
Two thin lenses of focal lengths f1 and f2 are in contact. The focal length of this combination is
|
(a) |
(b) |
(c) |
(d) |