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The following question based on electric current and magnetism topic of general science mcq
(a) a metal is kept in steady magnetic field
(b) a circular coil is placed in a magnetic field
(c) a metal is kept in varying magnetic field
(d) through a circular coil, current is passed
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
The Earth’s magnetic field is due to
a) Moving charges in space outside
b) Currents circulating inside the core
c) Presence of a huge magnet at its centre
d) None of the above
Answer »Answer: (b)
Question : 2
Which one of the following is correct? Lightning is formed, when
a) strong opposite charges in different clouds break down the resistance offered by intervening air
b) similar charges of electricity rush towards each other and then get repelled
c) clouds strike against impurities in air and hte friction burns up these impurities
d) water vapour produces electricity in the clouds
Answer »Answer: (a)
Question : 3
Assertion (A) :
A myopic person is advised to use concave lens.
Reason (R) :
The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina.
a) A is true but R is false
b) Both A and R are individually true and R is the correct explanation of A
c) Both A and R are individually true but R is NOT the correct explanation of A
d) A is false but R is true
Answer »Answer: (b)
Question : 4
One way in which the operation of an n-p-n transistor differs from that of a p-n-p
a) the emitter junction injects minority carriers into base region of the p-n-p
b) the emitter injects holes into the base of the p-n-p and electrons into the base region n-p-n
c) the emitter junction is reverse biased in n-p-n.
d) the emitter injects holes into the base of n-p-n
Answer »Answer: (b)
Question : 5
A dynamo which is said to generate electricity actually acts as a
a) Converter of energy
b) Source of ions
c) Source of electric charge
d) Source of electrons
Answer »Answer: (a)
Question : 6
Transistors are essentially
a) current driven devices
b) voltage driven devices
c) power driven devices
d) resistance driven devices
Answer »Answer: (a)
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