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The following question based on electric current and magnetism topic of general science mcq
(a) the gap between conduction band and valence band is more than 16 eV
(b) the gap between conduction band and valence band is near about 1 eV
(c) the conduction band and valence band overlap
(d) the gap between conduction band and valence band will be 100 eV and more
The correct answers to the above question in:
Answer: (b)
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Read more physics gk Based General Science Questions and Answers
Question : 1
When a body is charged by induction, then the body
a) does not lose any charge
b) loses whole of the charge on it
c) becomes neutral
d) loses part of the charge on it
Answer »Answer: (a)
Charging by induction involves transfer of charges from one part to the other of the body. No loss of charge is involved.
Question : 2
The primary cell which is used in daily life is
a) Dry cell
b) Daniel cell
c) Leclanche cell
d) Simple voltaic cell
Answer »Answer: (b)
Question : 3
A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a
a) plano-converging lens
b) converging lens
c) diverging lens
d) plano-diverging len
Answer »Answer: (c)
Question : 4
A magnetic needle is kept in a non-uniform magnetic field. It experiences
a) a force but not a torque
b) neither a force nor a torque
c) a torque but not a force
d) a force and a torque
Answer »Answer: (d)
A magnetic needle kept in non uniform magnetic field experience a force and torque due to unequal forces acting on poles.
Question : 5
The potential barrier, in the depletion layer, is due to
a) holes
b) electrons
c) ions
d) both (b) and (c)
Answer »Answer: (c)
Question : 6
When a semiconductor is heated, its resistance
a) increases
b) remains unchanged
c) decreases
d) either (b) or (c)
Answer »Answer: (c)
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