MCQ For Class 11 Physics Chapter 6 Work, Energy And Power With Answer

MCQ for Class 11 Physics Chapter 6 : MCQs for Class 11 Physics Chapter 6 Work, Energy and Power with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

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MCQ for Class 11 Physics Chapter 6 PDF with answer

MCQ for Class 11 Physics Chapter 6 Work, Energy and Power with answer

Q1. A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platfrom from where the took the jump the total work done by the man at the instant he lands is

(a) 300 J
(b) 150 J
(c) 600 J
(d) zero

Q2. A uniform chain of length 2 m is kept on a table such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain on the table?

(a) 7.2 J
(b) 3.6 J
(c) 120 J
(d) 1200 J

(b) 3.6 J

Q3. A body of mass 20 kg is initially at a height of 3 m above the ground . It is lifted to a height of 2 m from that position. Its increase in potential energy is

(a) 100 J
(b) 392 J
(c) 60 J
(d) -100 J

(b) 392 J

Q4. A body of mass 10 kg is travelling with uniform speed of 5 m/s. Its kinetic energy is

(a) 25 J
(b) 125 J
(c) 1250 J
(d) 1000 J

(b) 125 J

Q5. A ball is dropped from a height of 1 m. If the coeffcient of restitution between the surface and ball is 0.6, the ball rebounds to a height of

(a) 0.6 m
(b) 0.4 m
(c) 1 m
(d) 0.36 m

(d) 0.36 m

Q6. A quantity of work of 1000 J is done in 2 seconds. The power utilised is

(a) 998 W
(b) 1002 W
(c) 2000 W
(d) 500 W

(d) 500 W

Q7. When the linear momentum of a particle is increased by 1% its kinetic energy increases by x%. When the kinetic energy of the particle is increased by 300%, its linear momentum increases by y%. The ratio of y to x is

(a) 300
(b) 150
(c) 100
(d) 50

(d) 50

Q8. A solid cylinder of length 1 m and diameter of cross section y 100 cms is first placed with its axis vertical its then slowly inclined till its axis is horizontal. The loss in its potential energy if the mass of the cylinder is 10 kg is

(a) 5g J
(b) 10g J
(c) Zero
(d) g J

Q9. A body of mass 10 kg moving at a height of 2 m, with uniform speed of 2 m/s. Its total energy is

(a) 316 J
(b) 216 J
(c) 116 J
(d) 392 J

(b) 216 J

Q10. Two masses 1 g and 4 g are moving with equal kinetic energies. The ratio of the magnitudes of their linear momenta is

(a) 4 : 1
(b) 1 : 2
(c) 0 : 1
(d) 1 : 6

(b) 1 : 2

Q11. A body of mass 10 kg is initially at a height of 20 m above the ground. It falls to a height of 5 m above the ground. Its potential energy in the new position is

(a) 490 J
(b) 50 J
(c) 100 J
(d) 300 J

(a) 490 J

Q12. A man of 60 kg weight is standing at rest on a platform. He jumps up vertically a distance of 1 m and the platform at the same instant moves horizontally forward with the result that the man lands 1 meter behind the point on the platfrom from where the took the jump the total work done by the man at the instant he lands is

(a) 300 J
(b) 150 J
(c) 600 J
(d) zero

Q13. According to work-energy theorem, the work done by the net force on a particle is equal to the change in its

a) kinetic energy
b) angular momentum
c) linear momentum
d) potential energy

a) kinetic energy

Q14. A light and a heavy body have equal momentum. Which one has greater K.E.?

a) The lighter body
b) The heavier body
c) Both have equal K.E.
d) Data given is incomplete

a) The lighter body

Q15. Kinetic energy, with any reference, must be

a) positive
b) zero
c) negative
d) None of these

a) positive

Q16. Work done by a conservative force is positive if

a) P.E. of the body decreases
b) K.E. of the body increases
c) K.E. of the body decreases
d) P.E. of the body increases

a) P.E. of the body decreases

Q17. The …X… energy V(x) of the spring is said to be zero when block and spring system is in the …Y… position. Here, X and Y refer to

a) potential, equilibrium
b) kinetic, equilibrium
c) mechanical, equilibrium
d) vibrational, left

a) potential, equilibrium

Q18. Which of the following must be known in order to determine the power output of an automobile?

a) Work performed and elapsed time of work
b) Force exerted and distance of motion
c) Mass and amount of work performed
d) Final velocity and height

a) Work performed and elapsed time of work

Q19. A vehicle is moving with a uniform velocity on a smooth horizontal road, then power delivered by its engine must be

a) increasing
b) zero
c) uniform
d) decreasing

a) increasing

Q20. A body projected vertically from the earth reaches a height equal to earth’s radius before returning to the earth. The power exerted by the gravitational force is greatest

a) at the instant just before the body hits the earth
b) at the highest position of the body
c) it remains constant all through
d) at the instant just after the body is projected

a) at the instant just before the body hits the earth

Q21. How much water, a pump of 2 kW can raise in one minute to a height of 10 m, take g = 10 m/s2?

a) 1200
b) 100
c) 2000
d) 1000

a) 1200

Q22. The engine of a vehicle delivers constant power. If the vehicle is moving up the inclined plane then, its velocity

a) must remain constant
b) must increase
c) must decrease
d) may increase, decrease or remain same

a) must remain constant

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