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 image abbreviation less
(d) focus on distant object

Ans. (b)
Resolving power of a telescope is given as = d/1.22λ
The aperture of 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 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 air of atmosphere. Light coming from star refracts by layers of air which have different refractive indices. The refracted light coming to us from these layers also keeps on changing. That is why star 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 mains and then parallel

Ans. (b)
Various Household electric lines are connected in parallel combination. In parallel combination, all of lines having same voltage.


Q.5
A radio-active substance is one which 

(a) decays spontaneously emitting radiations
(b) is used to design radio parts
(c) is used in radio communication
(d) has property of attracting radio waves

Ans. (a)
A radio-active substance is decays spontaneously emitting radiations.


Q.6
Which of the following is a fundamental particle having no sub-structure?

(a) Proton
(b) Neutron
(c) Electron
(d) Deutron

Ans. (d)
Deutron having no sub-structure.


Q.7
Which of the following source of energy is non-renewable?

(a) Solar energy
(b) Ocean energy
(c) Biogas energy
(d) Coal energy

Ans. (d)


Q.8
The 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)
The nuclear energy is produced due to conversion of a small part of mass into energy.


Q.9
The velocity of a galaxy as it moves away from us as per 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) Equitorial orbit satellite

Ans. (c)
The satellite used in weather forecasting is Polar-orbit satellite.




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