# Work and Energy MCQ Questions for Class 9 Science Chapter 11 with Answers

We have completed the NCERT/CBSE chapter-wise Multiple Choice Questions for Class 9 Science book Chapter 11 Work and Energy with Answers by expert subject teacher for latest syllabus and examination. You can Prepare effectively for the exam taking the help of the Class 9 Science Objective Questions PDF free of cost from here. Students can take a free test of the Multiple Choice Questions of Work and Energy. Each Questions has four options followed by the right answer. Download the Science Quiz Questions with Answers for Class 9 free Pdf and prepare to exam and help students understand the concept very well.

(i) 0°
(ii) 45°
(iii) 90°
(iv) 180°

(iv) 180°

## Q2. When a body falls freely towards the earth, then its total energy

(i) Decreases
(ii) Increases
(iii) First increases and then decreases
(iv) Remains constant

(iv) Remains constant

(i) 6 × 10³ J
(ii) 6 J
(iii) 0.6 J
(iv) zero

(iv) zero

## Q4. When a body falls freely towards the earth, then its total energy

(i) Decreases
(ii) Increases
(iii) First increases and then decreases
(iv) Remains constant

(iv) Remains constant

## Q5. Which of the following does not possess the ability to do work not because of motion ?

(i) a sparrow flying in the sky
(ii) a sparrow moving slowly on the ground
(iii) a sparrow in the nest on a tree
(iv) a squirrel going up a tree

(iii) a sparrow in the nest on a tree

## Q6. Which one of the following is not the unit of energy?

(i) Joule
(ii) Newton meter
(iii) Kilowatt
(iv) Kilowatt hour

(iii) Kilowatt

(i) 25
(ii) 2.5
(iii) 0.25
(iv) 5

(ii) 2.5

## Q8. The work done on an object does not depend upon the

(i) displacement
(ii) force applied
(iii) angle between force and displacement
(iv) initial velocity of the object

(iv) initial velocity of the object

## Q9. Work done by a body is

(i) negative, positive or zero
(ii) always positive
(iii) always zero
(iv) always negative

(i) negative, positive or zero

(i) 5
(ii) 1.5
(iii) 2.5
(iv) 25

(iii) 2.5

(i) Energy
(ii) Work
(iii) Power
(iv) Heat

(i) Energy

## Q12. A body is falling from a height h. After it has fallen to a height of h/2, it will possess:

(i) Only kinetic energy
(ii) Half kinetic and half potential energy
(iii) Only potential energy
(iv) More kinetic and less potential energy

(iv) More kinetic and less potential energy

(i) 4 times
(ii) 8 times
(iii) 16 times
(iv) 12 times

(i) 4 times

## Q14. When speed of the moving object is doubled its

(i) Acceleration is doubled
(ii) Momentum becomes four times more
(iii) K E. is increased to four times
(iv) Potential energy is increased

(iii) K E. is increased to four times

## Q15. The capacity to perform work is obtained from :

(i) Food
(ii) Energy
(iii) Power
(iv) All of these

(ii) Energy

## Q16. The work done on an object does not depend upon the:

(i) Angle between force and displacement
(ii) Force applied
(iii) Initial velocity of the object
(iv) Displacement

(iii) Initial velocity of the object

## Q17. Work done by friction

(i) increases kinetic energy of body
(ii) decreases kinetic energy of body
(iii) increases potential energy of body
(iv) decreases potential energy of body.

(ii) decreases kinetic energy of body

## Q18. What is the commercial unit of energy?

(i) electron volt
(ii) W/s
(iii) kW h
(iv) joule

(iii) kW h

## Q19. What is the energy possessed by an object due to its motion?

(i) Potential energy
(ii) Electrical energy
(iii) Kinetic energy
(iv) None of them

(iii) Kinetic energy

## Q20. A microphone converts:

(i) Sound energy into mechanical energy in stereo system
(ii) Sound energy into electrical energy in public address system
(iii) Electrical energy into sound energy in ordinary telephone
(iv) Microwave energy into sound energy in a mobile phone

(ii) Sound energy into electrical energy in public address system

## Q21. One joule work is said to be done when

(i) a force of 1 N displaces a body by 1 cm
(ii) a force of 1 N displaces a body by 1 m
(iii) a force of 1 dyne displaces a body by 1 m
(iv) a force of 1 dyne displaces a body by 1 cm.

(ii) a force of 1 N displaces a body by 1 m

## Q22. According to the law of conservation of energy

(i) Energy can’t be destroyed
(ii) Energy can’t be created
(iii) Energy can be transformed from one from to another
(iv) All of the above

(iv) All of the above

## Q23. Mechanical energy of a body includes

(i) kinetic energy only
(ii) potential energy only
(iii) kinetic energy and potential energy
(iv) none of these

(iii) kinetic energy and potential energy

## Q24. In the SI system, the unit of potential energy is

(i) newton
(ii) joule
(iii) watt
(iv) metre per second

(ii) joule

## Q25. 9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of

(i) 20m
(ii) 980m
(iii) 10m
(iv) none of these

(i) 20m

## Q26. Potential energy and kinetic energy are types of

(i) Electrical energy
(ii) Magnetic energy
(iii) Thermal energy
(iv) Mechanical energy

(iv) Mechanical energy

## Q27. In which case work is not done:

(i) A girl swimming in a pond
(ii) A windmill lifting water from a well
(iii) A standing man holding a suit case in his hand
(iv) A sail boat moving in the direction of wind

(iii) A standing man holding a suit case in his hand

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