In This Post we are providing Chapter-6 Work , Energy and Power NCERT MCQ for Class 11 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON WORK, ENERGY AND POWER
Question 1: 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
Answer: Work performed and elapsed time of work
Question 2: 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
Answer: increasing
Question 3: 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
Answer: 1200
Question 4: 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
Answer: must remain constant
Question 5: 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
Answer: at the instant just before the body hits the earth
Question 6: When the force retards the motion of body, the work done is
- a) negative
- b) zero
- c) positive
- d) None of these
Answer: negative
Question 7: A man pushes a wall and fails to displace it, he does
- a) no work at all
- b) positive but not maximum work
- c) negative work
- d) maximum positive work
Answer: no work at all
Question 8: A boy carrying a box on his head is walking on a level road from one place to another is doing no work. This statement is
- a) correct
- b) incorrect
- c) partly correct
- d) cannot say
Answer: correct
Question 9: No work is done if
- a) All of these
- b) force and displacement are mutually perpendicular
- c) force is zero
- d) displacement is zero
Answer: All of these
Question 10: A particle is taken round a circle by application of force. The work done by the force is
- a) Zero
- b) positive non–zero
- c) negative non–zero
- d) None of these
Answer: Zero
Question 11: Assertion : The work done in moving a body over a closed loop is zero for every force in nature.
Reason : Work done depends on nature of force
- a) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
- b) Assertion is correct, reason is incorrect
- c) Assertion is incorrect, reason is correct.
- d) Assertion is correct, reason is correct; reason is a correct explanation for assertion
Answer: Assertion is correct, reason is correct; reason is not a correct explanation for assertion
Question 12: If a motorcyclist skids and stops after covering a distance of 15 m. The stopping force acting on the motorcycle by the road is 100 N, then the work done by the motorcycle on the road is
- a) Zero
- b) 750J
- c) –1500 J
- d) 1500 J
Answer: Zero
Question 13: A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is
- a) zero
- b) positive
- c) negative
- d) None of these
Answer: zero
Question 14: A spring of spring constant 5 × 103 N/m is stretched initially by 5 cm from the unstretched position. Then the work required to stretch it further by another 5 cm is
- a) 18.75 J
- b) 25.00 J
- c) 6.25 J
- d) 12.50 J
Answer: 18.75 J
Question 15: A boy pushes a toy box 2.0 m along the floor by means of a force of 10 N directed downward at an angle of 60º to the horizontal. The work done by the boy is
- a) 10 J
- b) 12 J
- c) 8 J
- d) 6 J
Answer: 10 J
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