NEET Physics Kinematics MCQs Set C

Q.11 Assertion : The average velocity of a particle is zero in a time interval. It is possible that the instantaneous acceleration is never zero in the interval.
        Reason :  The  magnitude of average velocity in an interval is equal to its average speed in that interval.

(1) A

(2) B

(3) C

(4) D

Q.12 Assertion : An objectmay have varying speedwithout having varying velocity.
        Reason : If the velocity is zero at an instant, the acceleration should also be zero at that instant.

(1) A

(2) B

(3) C

(4) D

Q.13 Assertion : Average speed of a particle in a given time interval is never less than themagnitude of the average velocity.
        Reason : The magnitude of the velocity (instantaneous velocity) of a particle is equal to its speed.

(1) A

(2) B

(3) C

(4) D

Q.14 Assertion : In successive time intervals if the average velocities of a particle are equal then the particle must be moving with constant velocity.
         Reason : When a particle moves with uniform velocity, its displacement always increaseswith time.

(1) A

(2) B

(3) C

(4) D

Q.15 Assertion : In a free fall, the initial velocity of a bodymay ormaynot be zero.
        Reason :  A  heavy body falls at a faster rate as compared to a lighter body.

(1) A

(2) B

(3) C

(4) D

Q.16 Assertion : If a body is dropped from the top of a tower of height h and another body is thrown up simultaneously with velocity u fromthe foot of the tower, then both of them would meet after a time h u .
        Reason : For a body projected upwards, the distance covered by the body in the last second of its upward journey is always 4.9m irrespective of velocity of projection.(g= 9.8m/s2.)

(1) A

(2) B

(3) C

(4) D

Q.21 Assertion : In a free fall, the initial velocity of a bodymay not be zero.
        Reason : Free falls means the vertical acceleration of the body is equal to g.

(1) A

(2) B

(3) C

(4) D

Q.22 Assertion : Distance is a actual length of the path but displacement is a shortest distance between initial andfinalposition.
        Reason :    Distance is a scalar quantity and it is always positive but displacement is a vector quantity. It may be positive, negative or zero.

(1) A

(2) B

(3) C

(4) D

Q.23 Assertion : Rest of a body is a relative term.
         Reason : Motion of a bodymay be absolute term.

(1) A

(2) B

(3) C

(4) D

Q.24 Assertion : If a body moves on a straight line,magnitude of its displacement and distance covered by it will be same.
        Reason : Along the straight line bodycanmove only in one direction.

(1) A

(2) B

(3) C

(4) D

Q.25 Assertion : Separation between two bodies moving in the same direction on the ground with same acceleration,will not increase.
        Reason : They are relatively at rest.

(1) A

(2) B

(3) C

(4) D

Q.30 Assertion : Path of projected ball becomes parabolic in gravitational field (θ ≠ 90°).
        Reason : Gravitational force always act perpendicular to velocityduring themotion.

(1) A

(2) B

(3) C

(4) D

Q.31 Assertion:  In projectile motion, the acceleration is constant in both magnitude and direction but the velocity changes in both magnitude and direction.
         Reason :    When a force or acceleration is acting in an oblique direction to the direction of velocity then both magnitude and direction of the velocity may be changed.

(1) A

(2) B

(3) C

(4) D

Q.32 Assertion : In projectile motion the projectile hits the ground with the same velocity with which it was thrown.
        Reason : In projectile motion horizontal velocity remains same but vertical velocity continously change and particle strikes the ground with same vertical velocity with which the particle was thrown in vertical direction.

(1) A 

(2) B

(3) C

(4) D

Q.33 Assertion : In projectile motion, the vertical velocityof the particle is continuously decreased during its ascending motion.
         Reason : In projectile motion downward constant acceleration is present in vertical directiion.

(1) A

(2) B

(3) C

(4) D

Q.34 Assertion: The path of one projectile as seen from another projectile is a straight line.
        Reason : Two projectiles projected with same speed at angles α and (90° – α)have same range.

(1) A

(2) B

(3) C

(4) D

Q.35 Assertion: In case of projectile motion, acceleration, horizontal component of velocity and mechanical energyr emains unchanged but speed, vertical component of velocity,momentum,K.E. and P.E. change.
        Reason : In the presence of air resistance, the range and maximum height attained reduce, but time of flight increases.

(1) A

(2) B

(3) C

(4) D

Q.36 Assertion: In the projectile motion projected body behave just like a freely falling body.
        Reason : There is no change in linear momentum in projectile motion.

(1) A

(2) B

(3) C

(4) D

Q.37 Assertion:  Projectile motion is uniformly accelerated motion.(Neglect the effec to fair.)
        Reason: In projectile motion, speed remains constant. 

(1) A

(2) B

(3) C

(4) D

Q.38 Assertion: Horizontal range is same for angle of projection  θ and  (90° – θ)  , if speed of projection is same.
        Reason : Horizontal range is independent of angle of projection.

(1) A

(2) B

(3) C

(4) D

Q.39 Assertion : To cross the river in minimum time, swimmer should swimming in perpendicular direction to the water current.
         Reason : In this case river flow helps to cross the river.

(1) A

(2) B

(3) C

(4) D

Q.40 Assertion :A body,whatever its motion is always at rest in a frame of reference which is fixed to the body itself.
        Reason : The relative velocity of a body with respect to itself is zero.

(1) A

(2) B

(3) C

(4) D