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

MCQ | Work, Power And Energy Class 9 | Part-2

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-2 )
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.	According to the law of conservation of energy
	A. Energy can’t be destroyed
	B. Energy can’t be created
	C. Energy can be transformed from one from to another
	D. All of the above

Ans: All of the above

Q2.	In SI system, the unit of P.E. is
	A. erg
	B. dyne-cm
	C. J
	D. None of these

Ans: J

Q3.	In the SI system, the unit of potential energy is
	A. newton
	B. joule
	C. watt
	D. metre per second

Ans: joule

Q4.	Two bodies of equal weight are kept at heights of h and 1.5 A, respectively. The ratio of their PE is
	A. 3 : 2
	B. 2 : 3
	C. 1 : 1
	D. 4 : 3

Ans: 2 : 3

Q5.	We can derive the formula for kinetic energy is from —
	A.Definition of acceleration
	B.Second equation of kinematics
	C.Third equation of kinematics
	D.Equation of potential energy

Ans: Third equation of kinematics

Q6.	A road roller is rolling on inclined road. Identity the energy associated with this.
	A.Kinetic energy
	B.Potential energy
	C.Mechanical energy
	D.Light energy.

Ans: kinetic energy

Q7.	The bulb glows because of electricity. Identify the energy conversion in this process.
	A.Light energy into electrical energy
	B.Electrical energy into light energy
	C.Chemical energy into heat energy
	D.Light energy into heat energy

Ans: Electrical energy into light energy

Q8.	A ball is released from certain height. Which of the following statement is correct about this example?
	A.Kinetic energy decreases at each second
	B.Potential energy decreases at each second.
	C.Total energy decreases at each second.
	D.All of the above.

Ans: potential energy decreases at each second.

Q9.	The unit of power is –
	A.HP
	B.J/S
	C.Kilowatt
	D.All of the above

Ans: All of the above

Q10.	The stone of mass 3.5 kg is height of 165 cm. Calculate potential energy contained in that stone.
	A.52.6 J
	B.54.6 J
	C.56.6 J
	D.58.6 J

Ans: 56.6 J

Q11.	A car of mass 325 kg is moving with 20 m/s. Calculate kinetic energy.
	A.60.kJ
	B.65 KJ
	C.70 KJ
	D.75 KJ

Ans: 65 KJ

Q12.	A bulb of rating 52 watt is on for 2 hours. Calculate energy consumed by the bulb.
	A.374.4 KJ
	B.372.4 KJ
	C.370.4 KJ
	D.368.4 KJ

Ans: 372.4 KJ

Q13.	A man do work of 730 J in 20 seconds. Calculate power delivered by the man.
	A.35.5 watt
	B.36.5 watt
	C.37.5 watt
	D.38.5 watt

Ans: 36.5 watt

Q14.	A ball is thrown vertically upward. The value of kinetic energy —-
	A.Increases at every second
	B.Decreases at every second
	C.Remains constant.
	D.Initially increases and then decreases

Ans: Decreases at every second

Q15.	On tripling the speed of motion of a body, the change in K.E. is
	A. 9 times
	B. 8 times
	C. 4 times
	D. 2 times

Ans: 9 times

Q16.	A stone is tied to a string and whirled in a circular path. The work done by the stone is :
	A. negative
	B. zero
	C. positive
	D. none of the above

Ans: zero

Q17.	9800 joule of energy was spent to raise a mass of 50kg, the mass was raised to a height of
	A. 20m
	B. 980m
	C. 10m
	D. none of these

Ans: 20m

Q18.	The linear momentum of a body of mass 2kg is 16kgms⁻¹. What is its K. E?
	A. 64J
	B. 70J
	C. 60J
	D. none of these

Ans: 64J

Q19.	Potential energy and kinetic energy are types of
	A. Electrical energy
	B. Magnetic energy
	C. Thermal energy
	D. Mechanical energy

Ans: Mechanical energy

Q20.	A body of mass 5 kg is moving with an acceleration of 5 ms^-2 gets a displacement of 2m, the work done by the force is:
	A. 75 J
	B. 25 J
	C. 100 J
	D. 50 J

Ans: 50 J

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