Class 9 Practice Level 1 – Work and Energy

Total questions: 40

When is work said to be done?

Topic: Work

When there is no displacement

When there is displacement in the direction of the applied force

When there is displacement opposite to the direction of the applied force

When there is displacement perpendicular to the applied force

None

What is the SI unit of energy?

Topic: Energy

Joule

Newton

Watt

Meter

None

What is power?

Topic: Power

The rate at which work is done

The total amount of work done

The force applied on an object

The energy stored in an object

None

Which of the following is the correct formula for work done?

Topic: Work

Work = Force × Distance

Work = Force + Distance

Work = Force / Distance

Work = Force - Distance

None

What type of energy is stored in a compressed spring?

Topic: Energy

Kinetic energy

Potential energy

Thermal energy

Electrical energy

None

Kinetic energy depends on which of the following?

Topic: Kinetic Energy

Mass and speed of an object

Mass and height of an object

Speed and height of an object

Force and distance

None

Potential energy is highest in which of the following situations?

Topic: Potential Energy

A ball at the top of a hill

A ball rolling down a hill

A ball at the bottom of a hill

A ball being thrown

None

What happens to the kinetic energy when the velocity of an object is doubled?

It remains the same

It is doubled

It is quadrupled

It is halved

None

What is the SI unit of power?

Topic: Power

Joule

Newton

Watt

Kilogram

None

10.

A man lifts a 20 kg box to a height of 2 meters. How much work is done?$ \displaystyle \left( {Takeg=10m/{{s}^{2}}} \right)$

Topic: Power

20 J

200 J

400 J

40 J

None

11.

Which form of energy is produced by vibrating objects?

Topic: Energy

Chemical energy

Electrical energy

Sound energy

Thermal energy

None

12.

What is the power of a machine that does 200 joules of work in 10 seconds?

Topic: Power

2 watts

20 watts

2000 watts

200 watts

None

13.

If the force applied is perpendicular to the direction of motion, what is the work done?

Topic: Work

Maximum

Minimum

Zero

Infinite

None

14.

What type of energy does a moving car possess?

Topic: Energy

Potential energy

Kinetic energy

Chemical energy

Thermal energy

None

15.

What is the potential energy of a 10 kg object raised to a height of 5 meters? $ \displaystyle \left( {Takeg=10m/{{s}^{2}}} \right)$

Topic: Potential Energy

50 J

500 J

100 J

1000 J

None

16.

How much power is required to do 1000 joules of work in 5 seconds?

5 watts

50 watts

200 watts

500 watts

None

17.

If a person pushes a wall and fails to move it, how much work is done?

Topic: Work

Zero

Maximum

Infinite

Depends on the force applied

None

18.

Which type of energy conversion takes place in a battery?

Topic: Energy

Electrical to chemical

Chemical to electrical

Mechanical to electrical

Thermal to electrical

None

19.

What is the power output of a machine that lifts a 50 kg mass to a height of 10 meters in 5 seconds? $ \displaystyle \left( {Takeg=10m/{{s}^{2}}} \right)$

Topic: Power

50 watts

100 watts

200 watts

1000 watts

None

20.

What happens to the kinetic energy of an object if its mass is halved and its velocity is doubled?

Topic: Kinetic Energy

It remains the same

It is doubled

It is halved

It is quadrupled

None

21.

Which of the following is an example of negative work?

Topic: Work

Lifting a book

Dropping a book

Pushing a car forward

A car coming to a stop

None

22.

What is the main form of energy used in a hydroelectric power plant?

Topic: Energy

Chemical energy

Nuclear energy

Mechanical energy

Thermal energy

None

23.

Which device measures the power of electrical appliances?

Topic: Power

Thermometer

Barometer

Voltmeter

Wattmeter

None

24.

How much work is done when a force of 10 N moves an object 3 meters in the direction of the force?

Topic: Work

3 J

10 J

30 J

100 J

None

25.

Which of the following is an example of potential energy?

Topic: Energy

A moving car

A stretched rubber band

Boiling water

Running water

None

26.

What is the power output if 500 J of work is done in 5 seconds?

Topic: Power

5 W

50 W

100 W

200 W

None

27.

If a force of 15 N is applied at an angle of 60 degrees to the direction of motion and moves an object 5 meters, what is the work done?

15 J

37.5 J

75 J

150 J

None

28.

What kind of energy transformation occurs when a ball is dropped from a height?

Topic: Energy

Potential to kinetic

Kinetic to potential

Mechanical to thermal

Thermal to electrical

None

29.

Which of the following units is equivalent to a watt?

Topic: Power

Joule per second

Newton per second

Meter per second

Kilogram per second

None

30.

Which of the following scenarios involves no work being done?

Topic: Work

Pushing a book across a table

Lifting a book off the ground

Holding a book stationary at a height

Dropping a book

None

31.

What is the energy possessed by a body due to its motion called?

Topic: Energy

Potential energy

Kinetic energy

Thermal energy

Chemical energy

None

32.

A light bulb consumes 60 J of energy in 1 second. What is its power rating?

Topic: Power

30 W

60 W

120 W

600 W

None

33.

Which of the following factors does not affect the amount of work done?

Topic: Work

Force applied

Distance moved

Direction of force

Colour of the object

None

34.

What type of energy is stored in a battery?

Topic: Energy

Kinetic energy

Potential energy

Chemical energy

Thermal energy

None

35.

How is electrical power calculated?

Topic: Power

Voltage × Current

Voltage + Current

Voltage / Current

Voltage - Current

None

36.

If a person lifts a 10 kg object to a height of 2 meters, what is the work done?$ \displaystyle \left( {\text{Take }g=10m/{{s}^{2}}} \right)$

Topic: Work

20 J

100 J

200 J

300 J

None

37.

Which type of energy is utilized in photosynthesis?

Topic: Energy

Chemical energy

Thermal energy

Light energy

Electrical energy

None

38.

What is the power of a motor that does 3000 J of work in 10 seconds?

Topic: Power

300 W

30 W

3000 W

30,000 W

None

39.

If a person pulls a suitcase with a force of 20 N over a distance of 10 meters, what is the work done?

Topic: Work

2 J

10 J

200 J

100 J

None

40.

What kind of energy transformation occurs in an electric fan?

Topic: Energy

Electrical to mechanical

Mechanical to electrical

Chemical to thermal

Thermal to electrical

None

1 out of 40

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Class 9 Practice Level 1 – Work and Energy

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