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The following question based on electric current and magnetism topic of general science mcq
(a) 1.414
(b) 1.0
(c) 1.33
(d) 1.6
The correct answers to the above question in:
Answer: (a)
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Read more physics gk Based General Science Questions and Answers
Question : 1
Alternating current is converted to direct current by
a) dynamo
b) transformer
c) rectifier
d) motor
Answer »Answer: (c)
Question : 2
Which element is the best conductor of electricity?
a) Aluminium
b) Silver
c) Copper
d) Iron
Answer »Answer: (b)
Question : 3
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 : 4
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)
Question : 5
Out of the following, diamagnetic substance is
a) lead
b) iron
c) copper
d) silver
Answer »Answer: (c)
Copper has negative susceptibility
(i.e. χ = –0.96). Hence, it is diamagnetic.
Question : 6
Consider the following statements :
- Magnetic field produced by current in a straight wire has no poles.
- The magnetic lines of force produced by a straight current carrying conductor are straight in nature.
- To produce a strong magnetic field at its centre, we prefer a current carrying wire loop of larger radius.
a) 1 only
b) 1 and 3
c) 2 only
d) 1, 2 and 3
Answer »Answer: (a)
Magnetic field lines form in concentric circles around a cylindrical current-carrying conductor, such as a length of wire.
The strength of the magnetic field at the centre of a circular coil carrying current is inversely proportional to the radius of the circular coil.
i.e. the field strength reduces as the radius of the coil increases.
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