MCQ Conservation of Energy and Power Chapter 11 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 14 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. What is the commercial unit of energy?

electron volt

W/s

kW h

joule

Question 1 of 14

2. 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

15 J

40 J

20 J

30 J

Question 2 of 14

3. A lamp consumes 1000J of energy in 10s, what is its power?

100 W

100000W

1kW

1000 W

Question 3 of 14

4. When we throw a rock from the top of a building which equation describes the energy of the body at each pint during the fall?

A

B

C

D

Question 4 of 14

5. What is not true about energy?

Energy can be created.

Energy can move from one object to another

Energy can be stored.

Energy can be transformed from one type of energy to another type of energy.

Question 5 of 14

6. If work is done at a faster rate, then

power is more

No power is required to do work

power is less

Infinite power is required

Question 6 of 14

7. A diesel engine supplies 25,000 J of energy in 50 seconds. Power of engine would be

7500 W

250 W

25000 W

500 W

Question 7 of 14

8. How much energy does a 150 W steam iron consume per second?

15 J

0.15 J

150 J

15 watt

Question 8 of 14

9. A ball is thrown vertically upwards. Its velocity keeps on decreasing. What happens to its kinetic energy when its reaches the maximum height?

Kinetic energy is double

Kinetic energy is zero

Kinetic energy is maximum at maximum height

Kinetic energy is half of initial value

Question 9 of 14

10. A girl weighing 45 kg jumps to a height of (1/3) m at the rate 10 times per minute. The power at which she is spending the energy is:

25 W

75 W

50 W

100 W

Question 10 of 14

11. Assertion- The baby has exerted a force in the direction of displacement of the car that time work done by force which is under positive sign.

Reason-Baby does her work which exerts force in the direction of displacement of a car.

a) Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Assertion and Reason are false.

Question 11 of 14

12. Assertion- The object which is in motion posses energy which we generally called kinetic energy.

Reason- Kinetic energy Is the only source of body.

a) Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Assertion and Reason are false.

Question 12 of 14

13. Assertion-The object which is in motion posses energy which we generally called kinetic energy.

Reason- A moving object always does work.

a) Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Assertion and Reason are false.

Question 13 of 14

14. Assertion-A moving object always does work.

Reason-The object which is in motion posses energy which we generally called kinetic energy.

a) Assertion and Reason are correct, and reason is the correct explanation for assertion.

b) Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c) Assertion is true but Reason is false.

d) Assertion and Reason are false.

Question 14 of 14

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