electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

electric current and magnetism PRACTICE TEST [9 - EXERCISES]

set 1

set 2

set 3

set 4

set 5

set 6

set 7

set 8

set 9

Question : 11

When a forward bias is applied to a p-n junction, it

a) reduces the majority carrier current to zero.

b) lowers the potential barrier.

c) raises the potential barrier.

d) None of these

Answer: (b)

Question : 12

Two spheres A and B of exactly same mass are given equal positive and negative charges respectively. Their masses after charging

a) mass of A > mass of B

b) mass of A < mass of B

c) remains unaffected

d) nothing can be said

Answer: (b)

A loses electrons and B gains electrons. Therefore, mass of A < mass of B.

Question : 13 [NDA]

Which one of the statements given below is not correct?

a) The degree to which the magnetic field can penetrate a medium is known as the relative permeability of the medium

b) A vertical plane passing through the axis of a freely suspended magnet is called the magnetic meridian

c) A vertical plan passing through the axis of rotation of the Earth is called the geographical meridian

d) The relative permeability is not a dimensionless quantity

Answer: (d)

Question : 14

Which of the following is an artificial magnet?

a) Magnetic needle

b) Bar magnet

c) Horse-shoe magnet

d) All of the above

Answer: (d)

Question : 15 [NDA]

Which one among the following is used to make periscope?

a) Plane mirror

b) Concave lens

c) Concave mirror

d) None of the above

Answer: (a)

IMPORTANT general science mcq EXERCISES

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1663 electric current and magnetism based general science mcq set 9 question answer with explanation pdf
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