- 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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Dynamo core is laminated because
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(a) Magnetic field increases |
|
(b) Magnetic saturation level in core increases |
|
(c) Residual magnetism in core decreases |
|
(d) Loss of energy in core due to eddy currents decreases |

A magnifying glass is to be used at the fixed object distance of 1 inch. If it is to produce an erect image magnified 5 times its focal length should be
|
(a) 0.2 inch |
(b) 0.8 inch |
(c) 1.25 inch |
(d) 5 inch |
A rocket is going away from the earth at a speed 0.2c, where c = speed of light. It emits a signal of frequency 4 . What will be the frequency observed by an observer on the earth
|
(a) 4 |
(b) 3.2 |
(c) 3 |
(d) 5 |
A radioactive substance has an average life of 5 hours. In a time of 5 hours
|
(a) Half of the active nuclei decay |
(b) Less than half of the active nuclei decay |
|
(c) More than half of the active nuclei decay |
(d) All active nuclei decay |