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The following question based on electric current and magnetism topic of general science mcq
(a) holes flow from emitter to collector
(b) electrons flow from collector to emitter
(c) electrons flow from emitter to collector
(d) electrons flow from battery to emitter
The correct answers to the above question in:
Answer: (c)
In an n-p-n transistor, the charge carriers, are free electrons in the transistor as well as in external circuit; these electrons flow from emitter to collector.
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Read more physics gk Based General Science Questions and Answers
Question : 1
A coin in a beaker filled with water appears raised. This phenomenon occurs because of the property of
a) total internal reflection of light
b) reflection of light
c) refraction of light
d) interference of light
Answer »Answer: (c)
Question : 2
Electrically charged particles from space travelling at speeds of several hundred km/sec can severely harm living beings if they reach the surface of the Earth. What prevents them from reaching the surface of the Earth?
a) Moisture in the upper layers of atmosphere prevents them from reaching the surface of the Earth
b) The Earth’s magnetic field diverts them towards its poles
c) Ozone layer around the Earth reflects them back to outer space
d) None of the statements (a), (b) and (c) given above is correct
Answer »Answer: (b)
Question : 3
Magnetism of a bar magnet can be destroyed if it is
- kept in the magnetic meridian.
- placed in a direction opposite to that of the Earth's horizontal intensity.
- heated to a temperature known as Curie temperature.
a) II and III only
b) I and III only
c) II only
d) I, II and III
Answer »Answer: (a)
Question : 4
A fuse is used in main electric supply as a safety device. Which one of the following statements about the fuse is correct?
a) It must have a low melting point
b) It is connected in parallel with the main switch
c) It is made mainly from silver alloys
d) It must have a very high resistance
Answer »Answer: (a)
Question : 5
The energy band gap is maximum in
a) superconductors
b) insulators
c) metals
d) semiconductors
Answer »Answer: (b)
Maximum in insulators and overlaping in metals.
Question : 6
Regarding a semiconductor which one of the following is wrong?
a) There are no free electrons at 0K
b) The number of free electrons increases with rise of temperature
c) There are no free electrons at room temperature
d) The charge carriers are electrons and holes
Answer »Answer: (c)
At room temperature, few bonds breaks and electron hole pair generates inside the semiconductor.
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