MCQ Questions | Class 9 Science Chapter 11

MCQ Questions | Class 9 Science Chapter 11 | Work, Power And Energy with Answers 

MCQ Questions for Class9 Science Chapter 11 Work, Power And Energy

MCQ | Work, Power And Energy Class 9 | Part-1

Check the below NCERT MCQ Questions for Class 9 Science Chapter 11 Work, Power And Energy with Answers Pdf free download. MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. We have Provided Work, Power And Energy Class 9 Science MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Science Class 9

NCERT Solutions Class 9 Science
Book: National Council of Educational Research and Training (NCERT)
Board: Central Board of Secondary Education (CBSE)
Class: 9th
Subject: Science
Chapter: 11 ( Part-1 )
Chapters Name: Work, Power And Energy
Medium: English

Ncert Solutions for Class 9 Science | Objective Type Questions


You can refer to NCERT Solutions for Class 9 Science Chapter 11 Work, Power And Energy to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.
Work, Power And Energy | Class 9 Science | NCERT Solutions
Q1. Work done by centripetal force is
A. >0
B. ≥0
C. <0
D.0
Ans: 0
Q2. When a body falls freely towards the earth, then its total energy
A. Decreases
B. Increases
C. First increases and then decreases
D. Remains constant
Ans: Remains constant
Q3. If work is done at a faster rate, then
A. power is more
B. No power is required to do work
C. power is less
D. Infinite power is required
Ans: power is more
Q4. Moon revolves around the earth due to gravitational force (F) of earth on moon. The work done by the gravitational force is (r = radius of circular orbit of moon)
A. F.2πr
B. F.πr
C. zero
D. negative work
Ans: zero
Q5. Work done by a body is
A. negative, positive or zero
B. always positive
C. always zero
D. always negative
Ans: negative, positive or zero
Q6. 1 W. S = ________?
A. 10 joule
B. 1 joule
C. 3.6 × 106 joule
D. 2 joule
Ans: 1 joule
Q7. Scientifically, work is said to be done in which of the following cases
A. Manish pulls the trolley for a certain distance
B. Mira studies for her exam
C. Manoj pushes the wall with no change in the position of wall
D. Mira pulls the wall with no change in the position of wall
Ans: Manish pulls the trolley for a certain distance
Q8. P.E of a spring increases when it is in the state of
A. compression
B. neither a nor b
C. expansion
D. both a and b
Ans: both a and b
Q9. When speed of the moving object is doubled its
A. Acceleration is doubled
B. Momentum becomes four times more
C. K E. is increased to four times
D. Potential energy is increased
Ans: K E. is increased to four times
Q10. A ball is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy when its reaches the maximum height?
A. Kinetic energy is double
B. Kinetic energy is zero
C. Kinetic energy is maximum at maximum height
D. Kinetic energy is half of initial value
Ans: Kinetic energy is zero
Q11. Energy is a —-quantity.
A.Scalar
B.Vector
C.Tensor
D.None of these
Ans: scalar
Q12. If a man hold an object of mass 20 kg at 1.3 m then the value of work done will be
A.26 J
B.30 J
C.20 J
D.0 J
Ans: 0 J
Q13. Which of the following is a source of energy?
A.Sun
B.Nuclear reactions
C.Tides
D.All of the above
Ans: all of the above
Q14. In which of the following examples does the work done not be zero?
A.The stone is rolling on frictionless surface with constant velocity.
B.A small child pushes a truck but truck remains stationary.
C.Moon revolve around earth because of gravitational force exerted by earth.
D.None of the above.
Ans: none of the above.
Q15. A stone weighing 1 kg is dropped from rest from a height of 4 metres above the ground. When it has free-fallen 1 metre its total energy with respect to the ground is
A. 15 J
B. 40 J
C. 20 J
D. 30 J
Ans: 40 J
Q16. The energy possessed by an oscillating pendulum of a clock is        
A. kinetic energy
B. potential energy
C. restoring energy
D. mechanical energy
Ans: mechanical energy
Q17. What is the commercial unit of energy?
A. electron volt
B. W/s
C. kW h
D. joule
Ans: kW h
Q18. Calculate the work done in moving a body of mass 50 Kg through a height of 5 m.(g = 10m/s2)​
A. 250 J
B. 2500 J
C. 25 x 103 J
D. 2.5 x 105 J
Ans: 2500 J
Q19. Find the correct statement
A. 1 Gigawatt is equal to 109W
B. power is the rate of doing work
C. both a and b
D. none of these
Ans: both a and b
Q20. If a force of F newton moves a body with constant speed v, the power delivered by it is
A. F/v
B. Fv
C. F2v
D. v/F
Ans: Fv

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