set 9 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 9 EXERCISES

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The following question based on electric current and magnetism topic of general science mcq

Questions : 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

The correct answers to the above question in:

Answer: (d)

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Read more physics gk Based General Science Questions and Answers

Question : 1

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 : 2

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)

Question : 3

Alternate current is not preferable

a) To transmit electric power

b) To charge storage battery

c) To run/start an electric motor

d) To heat up electric toaster

Answer: (b)

Question : 4

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 : 5

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 : 6

What gases are filled in fluorescent tube?

a) Mercury

b) Neon

c) Sodium

d) Mercury and neon

Answer: (d)

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