Kinematics MCQs
Q. Which of the following statement is true if a body moves in a semicircular track whose radius is R
(a) 2R is the displacement of the body
(b) πR is the distance travelled by the body
(c) Both (a) and (b) are correct
(d) None of the above
Answer: (c) Both (a) and (b) are correct
Q. What does the area under acceleration-time graph represent for any given time interval
(a) Final velocity
(b) Distance travelled
(c) Change in the velocity in that time interval
(d) Displacement of the particle
Answer: (c) Change in the velocity in that time interval
Q. When can we say that the resultant of the two vectors is maximum
(a) When the vectors are acting in the opposite direction
(b) Both the vectors are acting in the same direction
(c) When the vectors are at right angles
(d) When the vectors are parallel to each other
Answer: (b) Both the vectors are acting in the same direction
MCWQ’S ON Gravitation
Q. What happens to the gravitational potential at the centre of the uniform spherical shell which shrinks gradually?
(a) Remains constant
(b) Decreases
(c) Increases
(d) Oscillates
Answer: (b) Decreases
Q. Choose the factor on which the orbital velocity does not depend when the satellite is orbiting close to the earth’s surface
(a) The mass of the earth
(b) The mass of the satellite
(c) The orbital radius
(d) The radius of the earth
Answer: (b) The mass of the satellite
Q. The atmosphere around the earth is held by
(a) Gravity
(b) Winds
(c) Clouds
(d) None of the above
Answer: (a) Gravity
Work, Energy and Power MCQ
Q. By how much does kinetic energy increase if the momentum is increased by 20%
(a) 55%
(b) 66%
(c) 44%
(d) 77%
Answer: (c) 44%
Q. Calculate the energy loss in a perfectly inelastic collision if the mass of the object is 40kg with velocity 4m/s hits the object of mass 60kg with velocity 2m/s.
(a) 440J
(b) 110J
(c) 392J
(d) 48J
Answer: (d) 48J
Q. Calculate the final kinetic energy of a block of mass if the mass of the block is 10kg and has a constant velocity of 10m/s. The block of mass is subjected to a retarding force of F=0.1J/m
(a) 275J
(b) 250J
(c) 475J
(d) 450J
Answer: (c) 475J
Q. What is the average power required to lift a mass of 100kg to a height of 50m in 50 seconds?
(a) 980
(b) 100
(c) 50
(d) 5000
Answer: (a) 980
Q. What is the power of the engine when the velocity of the car is v, mass m, acceleration a, and external resistance R
(a) (R-ma)v
(b) (R+ma)v
(c) mav
(d)Rv
Answer: (b) (R+ma)v
Q. When can one say that work is done on the body
(a) When the body experiences force
(b) When there is an increase in energy because of mechanical influence
(c) When the body moves a certain distance
(d) None of the above
Answer: (b) When there is an increase in energy because of mechanical influence
Q. Select the incorrect statement for the given situation: Two bodies with mass m1 and m2 undergo elastic collision
(a) When m1 and m2 is at rest, the kinetic energy transferred will be maximum
(b) The bodies will move in the same direction if m1 = m2 and when the collision is in oblique
(c) When m1 > m2, m2 will move with four times increase in its velocity than m1
(d) When m1 < m2, the transfer of momentum will be maximum
Answer: (c) When m1 > m2, m2 will move with four times increase in its velocity than m1
Q. What is the ratio of velocities of a nucleus that splits into two parts with radii 1:2
(a) 6:1
(b) 2:1
(c) 8:1
(d) 4:1
Answer: (c) 8:1
