Physics MCQ for Various Entrance Exam, Set 1

Physics MCQ for Various Entrance Exam

Q.1

The aperture of the objective lens of a telescope is made large so as to

(a) increase the magnifying power of the telescope

(b) increase the resolving power of the telescope

(c) Make the image abbreviation less

(d) Focus on a distant object

Ans. (b)

Resolving power of a telescope is given as = d/1.22λ

The aperture of the object lens is made large, so as to increase the resolving power of the telescope.

Q.2

The twinkling of stars is due to 

(a) intermittent emission of light by stars

(b) intermittent reception of light by our eyes

(c) continuous varying refractive index of the atmosphere

(d) vibrations of stars about their positions

Ans.(c)

Stars seem to be twinkling due to the refraction of light coming from the star by different layers of the atmosphere. Light coming from a star refracts through layers of air that have different refractive indices. The refracted light coming to us from these layers also keeps on changing. That is why stars sometimes look bright and sometimes less bright, and this produces the effect of twinkling.

Q.3

The source of Solar Energy is -

(a) nuclear fission

(b) nuclear fusion

(c) burning of natural gas

(d) burning of lignite

Ans. (b)

Q.4

Various Household electric lines are connected in

(a) series

(b) parallel

(c) both series and parallel

(d) in series with the mains and then parallel

Ans. (b)

Various Household electric lines are connected in a parallel combination. In parallel combination, all of the lines have the same voltage.

Q.5

A radioactive substance is one which 

(a) decays spontaneously emitting radiation

(b) is used to design radio parts

(c) is used in radio communication

(d) has the property of attracting radio waves

Ans. (a)

A radioactive substance decays spontaneously, emitting radiation.

Q.6

Which of the following is a fundamental particle having no substructure?

(a) Proton

(b) Neutron

(c) Electron

(d) Deutron

Ans. (d)

Deuteron has no substructure.

Q.7

Which of the following sources of energy is non-renewable?

(a) Solar energy

(b) Ocean energy

(c) Biogas energy

(d) Coal energy

Ans. (d)

Q.8

Nuclear energy is produced due to

(a) chemical reaction

(b) loss of kinetic energy of one reactant

(c) loss in electromagnetic potential energy

(d) conversion of a small part of mass into energy

Ans. (d)

Nuclear energy is produced due to the conversion of a small part of mass into energy.

Q.9

The velocity of a galaxy as it moves away from us according to Hubble's law

(a) remains constant

(b) increases with distance

(c) decreases with distance

(d) first increases and then decreases

Ans. (b)

The velocity of a galaxy as it moves away from us as per Hubble's law increases with distance.

Q.10

The satellite used in weather forecasting is -

(a) Geostationary satellite

(b) Near-earth satellite

(c) Polar-orbit satellite

(d) Equatorial orbit satellite

Ans. (c)

The satellite used in weather forecasting is a Polar-orbit satellite.

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