set 9 MCQ Questions & Answers Detailed Explanation

Question : 1

From a power station, the power is transmitted at a very high voltage because –

a) electricity at high voltage is less dangerous

b) it is generated only at high voltage

c) it is cheaper to produce electricity at high voltage

d) there is less loss of energy in transmission at high voltage

Question : 2

Dynamo is a machine which is used for

a) Conversion of mechanical energy to electrical energy

b) Conversion of high voltage to low voltage

c) Conversion of electrical energy to mechanical energy

d) Conversion of low voltage to high voltage

Question : 3

Parameters of electricity supply in India are

a) Potential Difference of 220 V, Frequency of 60 hertz and Current Rating of 15A

b) Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A

c) Potential Difference of 150 V, Frequency of 40 hertz and Current Rating of 10 A

d) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating of 5 A

Question : 4

Which one among the following is used to make periscope?

a) Plane mirror

b) Concave lens

c) Concave mirror

d) None of the above

Question : 5

Which of the following is an artificial magnet?

a) Magnetic needle

b) Bar magnet

c) Horse-shoe magnet

d) All of the above

Question : 6

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