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The following question based on electric current and magnetism topic of general science mcq
(a) Aluminium
(b) Silver
(c) Copper
(d) Iron
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
Barrier potential of a p-n junction diode does not depend on
a) diode design
b) temperature
c) doping density
d) forward bias
Answer »Answer: (a)
[Hint : Barrier potential depends on, doping density, temperature, forward/reverse bias but does not depend on diode design.]
Question : 2
The main power supply in India is at 220 V, whereas that in the US is at 110 V. Which one among the following statements in this regard is correct?
a) 110 V leads to lower power loss
b) 110 V is safer but more expensive to maintain
c) 110 V is safer and cheaper to maintain
d) 110 V works better at higher latitudes
Answer »Answer: (b)
Question : 3
When a fuse is rated 8A, it means
a) it has a resistance of 8 ohm
b) it will work only if current is 8A
c) it will not work if current is less than 8A
d) it will burn if current exceeds 8A
Answer »Answer: (c)
Question : 4
Alternating current is converted to direct current by
a) dynamo
b) transformer
c) rectifier
d) motor
Answer »Answer: (c)
Question : 5
A ray of ligh is incident normally on one of the faces of right angled isosceles prism as shhown above. It undergoes total internal reflection from hypotenuse. Which one of the following is the minimum refractive index of the material of the prism?
a) 1.414
b) 1.0
c) 1.33
d) 1.6
Answer »Answer: (a)
Question : 6
The length of a wire is doubled and the radius is doubled. By what factor does the resistance change?
a) Twice as large
b) Unchanged
c) 4 times as large
d) Half as large
Answer »Answer: (d)
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