Physics MCQ for Various Entrance Exam


Q.1
The Indian Rohini Satellite Mission is for

(a) extending communication network
(b) study of weather parameters
(c) remote sensing
(d) astronomical studies

Ans. (a)
The Indian Rohini Satellite Mission is for extending communication network.


Q.2
Rocket jet works on the principle of 

(a) Bernauli's principle
(b) Conservation of angular momentum
(c) Newton's third law of motion
(d) Archimedies principle

Ans. (c)
Rocket jet works on the principle of Newton's third law of motion.


Q.3
The gravitational attraction between two masses placed at a certain distance depends on 

(a) gravity at that place
(b) presence of other bodies
(c) medium in which placed
(d) None of the above

Ans. (d)
From gravitational force,
F = G(m1m2/r²)
The gravitational attraction between two masses placed at a certain distance depends None of the above.


Q.4
The main force that keeps two atoms at definite distance in a diatomic molecule is 

(a) electrostatic force
(b) magnetic force
(c) gravitational force
(d) nuclear force

Ans. (d)
The main force that keeps two atoms at definite distance in a diatomic molecule is nuclear force. According to Heisenberg, it is exchange force. It is produced by exchange electrons or positrons.


Q.5
The mirror towards the side of the driver of a car to have a look at the traffic coming from behind is -

(a) plano-convex 
(b) concave
(c) convex
(d) plain mirror

Ans. (c)
Convex mirror is used as a rear view mirror in vehicle because it provides the maximum rear field of and image formed is always erect.-


Q.6
In electro-magnetic induction, emf is proportional to -

(a) magnetic flux
(b) resistance of circuit
(c) change of magnetic flux
(d) rate of change of magnetic flux

Ans. (d)
In electro-magnetic induction, emf is proportional to rate of change of magnetic flux.


Q.7
An electron is in motion in a direction parallel to the magnetic field . Force on electron will be in the direction -

(a) perpendicular to the field
(b) in the direction of the field
(c) in the direction opposite to the field
(d) zero

Ans. (d)
An electron charged particle is in motion in a direction parallel to the magnetic field, then no force apply on it. Therefore, force on electron in the direction of magnetic field will be zero.


Q.8
In radioactive disintegration, the nucleus radiates at any one time is -

(a) only 'α' or 'β' particles
(b) both 'α' and 'β' particles
(c) 'α' or 'β' particles + 'γ' gamma photon
(d) 'α' rays, 'β' rays and 'γ' radiation

Ans. (a)
In radioactive disintegration, the nucleus radiate only 'α' or 'β' particle at a time.


Q.9
Which of these is the correct option in respect of speed of gamma radiation in comparison to speed of light?

(a) Speed of γ radiation > speed of light
(b) Speed of γ radiation = speed of light
(c) Speed of γ radiation < speed of light
(d) Speed of γ radiation may less or greater or equal to speed of light depending on certain condition

Ans. (b)
The speed of γ radiation is equal to speed of light


Q.10
Proton is -

(a) nucleus of heavy hydrogen
(b) a fundamental particle
(c) electro positive particle
(d) All of the above

Ans. (c)
Proton is a subatomic particle with the symbol p or p+. It is an electro positive particle but not a fundamental particle (However, initially it was considered as fundamental particle). It is equivalent to hydrogen nuclei but not to heavy hydrogen nuclei.