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The following question based on electric current and magnetism topic of general science mcq
![physics magnetism mcq question answer 21](https://careericons.com/adminicon/bunch/images/physics-magnetism-mcq-question-answer-21.png)
(a) A will move side ways
(b) A will stuck to B
(c) A will remain as in figure
(d) Can't say
The correct answers to the above question in:
Answer: (c)
Unlike poles repel. The repulsive magnetic force will not allow the like poles to get stuck.
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Read more physics gk Based General Science Questions and Answers
Question : 1
The filament of an electric bulb is of tungsten because
a) it is cheaper
b) its melting point is high
c) its resistance is negligible
d) filament is easily made
Answer »Answer: (b)
Question : 2
When current is passed through an electric bulb, its filament glows, but the wire leading current to the bulb does not glow because
a) the leading wire has more resistance than the filament
b) the leading wire has less resistance than the filament
c) less current flows in the leading wire as compared to that in the filament
d) filament has coating of fluorescent material over it
Answer »Answer: (b)
Question : 3
The part of a transistor which is most heavily doped to produce large number of majority carriers is
a) base
b) collector
c) emmiter
d) can be any of the above three
Answer »Answer: (c)
Question : 4
For a transistor amplifier, the voltage gain
a) is high at high and low frequencies and constant in the middle frequency range.
b) is low at high and low frequencies and constant at mid frequencies.
c) remains constant for all frequencies.
d) none of the above
Answer »Answer: (b)
Question : 5
What should be the characteristic of fuse wire?
a) Low melting point, low specific resistance
b) High melting point, low specific resistance
c) High melting point, high specific resistance
d) Low melting point, high specific resistance
Answer »Answer: (d)
Fuse wire should be such that it melts immediatley when strong current flows through the circuit. The same is possible if its melting point is low and resistivity is high.
Question : 6
A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points?
a) 4 W
b) 1 W
c) 2 W
d) 8 W
Answer »Answer: (a)
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