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The following question based on electric current and magnetism topic of general science mcq
(a) excess of protons
(b) deficiency of electrons
(c) excess of electrons
(d) deficiency of neutrons
The correct answers to the above question in:
Answer: (b)
Positive charge is due to deficiency of electrons.
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Read more physics gk Based General Science Questions and Answers
Question : 1
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 : 2
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.
Question : 3
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 : 4
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)
Question : 5
When an iron bar is moved over a bar magnet along its length the attractive force
a) remains same
b) increases first and then decreases
c) decreases first and then increases
d) cannot say
Answer »Answer: (c)
Question : 6
Magnetic meridian is a
a) vertical plane
b) point
c) horizontal plane
d) line along N-S
Answer »Answer: (a)
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