ICSE Worksheet for chapter-4 Work, Energy and Power class 10

Worksheet For class 10

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Summary

• Energy resources, Classification of sources of energy, Production of electricity
• Conservation of energy, verification ,Applications, Energy degradation

Section 1 - Objective

Q1. Renewable source of energy is

1. Coal
2. Fossil fuels
3. Natural gas
4. Solar energy

Q2. Two bodies of masses m₁ and m₂ are moving with equal kinetic energy. What is the ratio of their momentum?

1. m₁:m₂
2. √m_1:√m₂
3. m₂:√m₁
4. NOT

Q3. A bag of rice weights 200 Kg. To what height should it be raised so that its potential energy may be 9800 J?

1. 5 m
2. 10 m
3. 20 m
4. 40 m

Q4. A conventional source of energy is

1. Solar
2. Nuclear
3. Coal
4. Wind

Q5. A pendulum is oscillating on either side of its rest position. The correct statement is

1. It has only K.E
2. It has only P.E
3. The T.E is constant
4. NOT

Q6. ……………. is the main source of energy to the earth

1. Sun
2. Moon
3. Petrol
4. Diesel

Q7. In an electric toaster ……… energy converts to …………energy.

1. Sound to electrical
2. Electrical to heat
3. Heat to electrical
4. NOT

Q8. While swinging the bob has only …….. energy at the extreme positions.

1. Potential
2. Kinetic
3. Heat
4. Light

Q9. When a body is thrown vertically upwards, than

1. Potential energy changes into Kinetic energy
2. Kinetic energy changes into potential energy
3. Heat energy changes into light energy
4. NOT

Q10. A ball of mass 0.2kg is thrown vertically upwards with an initial velocity of 20m/s. Calculate the maximum potential energy it gains as it goes up.

1. 20J
2. 30J
3. 40J
4. 243 J

Section 2 - Subjective

• Q1. Explain the energy changes that take place in the oscillating pendulum.
• Q2. Distinguish between renewable & non-renewable sources of energy.
• Q3. Mention the advantages and disadvantages of using nuclear energy for producing electricity.
• Q4. A car weighting 600 Kg travels with 30m/s stops at a distance of 50 m decelerating uniformly. What is the force exerted by the brakes? What is the work done by the brakes?
• Q5. What do you mean by energy degradation?

Solutions for Section 1 & 2

Objective Problems​:

Subjective Prob​lems

Ans 3. 2000J

Ans 4. F = 5400N and W= 270000J

Ans 6. (i) Light energy changes into chemical energy

(ii) Electrical energy changes into chemical energy

Ans 7. (i) 1KWh = 3.6 x 10⁶ J

(ii) W = F.d. cos Ө