CBSE Class 11 Physics Chapter 6 Work, Energy and Power Multiple Choice Questions with Answers. MCQ Questions Class 11 Physics Work, Energy and Power with Answers was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 11 Physics Work, Energy and Power MCQs with Answers to know their preparation level.
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MCQ Questions Class 11 Physics Work, Energy and Power with Answers - Set - 5
Question 1:
A bomb of mass 9 kg explodes into the pieces of masses 3 kg and 6 kg. The velocity of mass 3 kg is 16 m/s. The kinetic energy of mass 6 kg in joule is
(a) 96
(b) 384
(c) 192
(d) 768
Correct Answer – (C)
Question 2 :
A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is
(a) positive
(b) negative
(c) zero
(d) None of these
Correct Answer – (C)
Question 3 :
Assertion : A man rowing a boat upstream is at rest with respect to the bank. He is doing no external work. Reason : Work done by constant force, W = F s cos q.
(a) Assertion is correct, reason is correct; reason is a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.
Correct Answer – (A)
Question 4 :
A force acts on a 30 g particle in such a way that the position of the particle as a function of time is given by x = 3t – 4t2 + t3, where x is in metres and t is in seconds. The work one during the first 4 seconds is
(a) 576 mJ
(b) 450 mJ
(c) 490 mJ
(d) 530 mJ
Correct Answer – (A)
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 highest position of the body
(b) at the instant just before the body hits the earth
(c) it remains constant all through
(d) at the instant just after the body is projected
Correct Answer – (B)
MCQ Questions Class 11 Physics Work, Energy and Power with Answers
Question 6 :
A small body is projected in a direction inclined at 45º to the horizontal with kinetic energy K. At the top of its flight, its kinetic energy will be
(a) Zero
(b) K/2
(c) K/4
(d) K / 2
Correct Answer – (B)
Question 7 :
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) 1500 J
(b) –1500 J
(c) 750J
(d) Zero
Correct Answer – (D)
Question 8 :
A cord is used to lower vertically a block of mass M, a distance d at a constant downward acceleration of g/4. The work done by the cord on the block is
(a) Mg d 4
(b) 3Mg d 4
(c) 3Mg d 4 –
(d) Mg d
Correct Answer – (C)
Question 9 :
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 a correct explanation for assertion.
(b) Assertion is correct, reason is correct; reason is not a correct explanation for assertion
(c) Assertion is correct, reason is incorrect
(d) Assertion is incorrect, reason is correct.
Correct Answer – (B)
Question 10 :
A body is moved along a straight line by a machine delivering a constant power. The distance moved by the body in time ‘t’ is proportional to
(a) t3/4
(b) t3/2
(c) t1/4
(d) t1/2
Correct Answer – (B)
- NCERT Solutions Class 11 Physics Chapter 1 : Physical world
- NCERT Solutions Class 11 Physics Chapter 2 : Units And Measurements
- NCERT Solutions Class 11 Physics Chapter 3 : Motion In A Straight Line
- NCERT Solutions Class 11 Physics Chapter 4 : Motion In A Plane
- NCERT Solutions Class 11 Physics Chapter 5 : Laws of Motion
- NCERT Solutions Class 11 Physics Chapter 6 : Work Energy Power
- NCERT Solutions Class 11 Physics Chapter 7 : Rotational-Motion
- NCERT Solutions Class 11 Physics Chapter 8 : Gravitation
- NCERT Solutions Class 11 Physics Chapter 9 : Mechanical Properties of Solids
- NCERT Solutions Class 11 Physics Chapter 10 : Mechanical Properties of Fluids
- NCERT Solutions Class 11 Physics Chapter 11 : Thermal Properties of Matter
- NCERT Solutions Class 11 Physics Chapter 12 : Thermodynamics
- NCERT Solutions Class 11 Physics Chapter 13 : Kinetic Theory
- NCERT Solutions Class 11 Physics Chapter 14 : Oscillations
- NCERT Solutions Class 11 Physics Chapter 15 : Waves
