Class 9 Science MCQ Chapter 11 Work and Energy

Class 9 Science MCQ Chapter 11 Work and Energy, Class 9 Science MCQ Question Answer, Class 9 Science Multiple Choice Question Answer to each chapter is provided in the list of SCERT Science Class 9 Objective Types Question Answer so that you can easily browse through different chapters and select needs one. Class 9 Science MCQ Chapter 11 Work and Energy Question Answer can be of great value to excel in the examination.

SCERT Class 9 Science MCQ Chapter 11 Work and Energy

SCERT Class 9 Science MCQ Chapter 11 Work and Energy Notes covers all the exercise questions in SCERT Science Textbooks. The NCERT Class 9 Science MCQ Chapter 11 Work and Energy provided here ensures a smooth and easy understanding of all the concepts. Understand the concepts behind every chapter and score well in the board exams.

Work and Energy

Chapter – 11

Multiple Choice Questions & Answers

1. What is the S. I. Unit of work?

(a) Newton 

(b) Watt

(c) Kilowatt 

(d) Joule

Ans: (d) Joule.

2. Which of the following is correct? 

        Joule

(a) ——-—— = metre

       Newton

       Joule

(b) ———— = newton

       metre

(c) Joule = Newton × metre

       Newton

(d) ———— = metre

       Joule

Ans: (c) Joule = Newton x metre.

3. Which of the following S. I. unit of power?

(a) Kilowatt 

(b) Watt

(c) Joule 

(d) Newton

Ans: (b) Watt.

4. Which of the following is correct? 

(a) 1 KJ=746 J 

(b) 1 KJ-500 J

(c) 1 KJ=100 J 

(d) 1 KJ=1000 J

Ans;(d) 1 KJ=1000 J.

5. Which of the following is correct?

(a) 1KW 1000 JS⁻¹

(b) 1KW 500W

(c) 1KW=100W

(d) 1KW=100 JS⁻¹

Ans: (a) 1KW=1000 JS⁻¹

6. In the department of electricity, 1 unit means.

(a) 1 kilowatt

(b) 1 kilowatt. hour

(c) 1 watt

(d) 1 watt. second

Ans: (b) 1 kilowatt. hour.

7. Which of the following relation is correct?

(a) 1K wh=3.6 × 10³J

(b) 1K wh=3.5×10ºJ

(c) 1K w=3.6x106J

(d) 1K w=3.5×10’J

Ans: (c) 1K w =3.6×10°J.

8. Ifm is the mass and V is the velocity of an object. Then kinetic energy is

(a) mv²

(b) ⅓ = mv²

(c) ¼ mv ²

(d) ½mv²

Ans: ½mv²

9.If m is the mass and h is the height of an object from the ground. Then potential energy is –

(a) mg 

(b) mgh

(c) gh 

(d) ½ mgh

Ans: (b) mgh.

10. If potential energy is mgh and kinetic energy is ½ mv ² Then –

(a) mgh + ½ mv² = constant

(b) mgh – ½m² = constant

(c) mgh x ½ mv² = constant

(d) mgh ÷ ½ mv² = constant

Ans: (a) mgh + ½ mv² = constant.

11. Which of the following is correct? 

(a) potential energy-kinetic energy mechanical energy.

(b) potential energy + kinetic energy = mechanical energy.

(c) potential energy + kinetic energy = 0 

(d) potential energy – kinetic energy = 0 

Ans: (b) potential energy + kinetic energy = mechanical energy.

12. Which of the following is the value of g?

(a) 9.6 ms⁻² 

(b) 9.7 ms⁻²

(c) 9.8 ms⁻² 

(d) 9.9 ms⁻²

Ans: (c) 9.8 ms⁻²

13. For simplifying the calculation it is taken the value of ‘g’ as

(a) 9.0 ms⁻² 

(b) 9.5 ms⁻²

(c) 9.4 ms⁻² 

(d) 10. ms⁻²

Ans: (d) 10. ms⁻²

14. An object (m) falls to ground level from the height is about the ground level potential energy is –

(a) mgh 

(b) O

(c) ½ mv ² 

(d) mg

Ans: (b) O

15. An object (m) falls to the ground level from the height ‘h’. When about the ground level kinetic energy is –

(a) less 

(b) least

(c) hight 

(d) highest

Ans: (d) highest.