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The following question based on electric current and magnetism topic of general science mcq
(a) the free charge tends to be in its minimum kinetic energy state
(b) the free charge tends to be in its maximum potential energy state.
(c) the free charge tends to be in its minimum potential energy state
(d) the free charge tends to be in its maximum kinetic energy state
The correct answers to the above question in:
Answer: (c)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Which is the gas inside an electric bulb?
a) Carbon dioxide
b) Argon
c) Nitrogen
d) Both (A) and (B)
Answer »Answer: (d)
Question : 2
The universal properties of all substances is
a) paramagnetism
b) diamagnetism
c) ferromagnetism
d) All of these
Answer »Answer: (b)
Question : 3
In an A.C. circuit with voltage V and current I the power dissipated is
a) $1/2$VI
b) V I
c) $1/√2$VI
d) dependent on the phase between V and I
Answer »Answer: (d)
Power dissipated = $E_{rms}. I_{rms} = (E_{rms}) (I_{rms})$cosϴ
Hence, power dissipated depends upon phase difference.
Question : 4
Two pieces of conductor of same material and of equal length are connected in series with a cell. One of the two pieces has cross-sectional area double that of the other. Which one of the following statements is correct in this regard ?
a) Same amount of electric current would pass through both the pieces producing more heat in the thicker one.
b) The thicker one will allow stronger current to pass through it.
c) The thinner one would allow stronger current to pass through it.
d) Same amount of electric current would pass through both the pieces producing more heat in the thinner one.
Answer »Answer: (d)
Question : 5
When a solid with a band gap has a donor level just below its empty energy band, the solid is
a) a conductor
b) p-type semiconductor
c) an insulator
d) n-type semiconductor
Answer »Answer: (d)
Donor level close to energy band is in case of n-type semi-conductor.
Question : 6
An electric lamp of 100 watt is used for 10 hours per day. The ‘units’ of energy consumed in one day by the lamp is
a) 10 units
b) 1 unit
c) 0.1 unit
d) 100 units
Answer »Answer: (b)
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