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The following question based on electric current and magnetism topic of general science mcq
(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
The correct answers to the above question in:
Answer: (c)
At room temperature, few bonds breaks and electron hole pair generates inside the semiconductor.
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Read more physics gk Based General Science Questions and Answers
Question : 1
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 : 2
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 : 3
When an n–p–n transistor is used as an amplifier then
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
Answer »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.
Question : 4
Which gas is filled in normal tubelights?
a) Mercury vapour with argon
b) Sodium vapour with argon
c) Sodium vapour with neon
d) Mercury vapour with neon
Answer »Answer: (a)
Question : 5
If a body is positively charged, then it has
a) excess of protons
b) deficiency of electrons
c) excess of electrons
d) deficiency of neutrons
Answer »Answer: (b)
Positive charge is due to deficiency of electrons.
Question : 6
Consider the following statements
- Clear sky appears blue due to poor scattering of blue wavelength of visible light.
- Red part of light shows more scattering than blue light in the atmosphere.
- In the absence of atmosphere, there would be no scattering of light and sky will look black.
a) Only 3
b) Only 1
c) 1 and 2
d) All of these
Answer »Answer: (a)
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