Work, Energy, and Power: Interactive Learning Quizzes for Year 12 Physics

Question 1

A block of mass 2 kg is lifted vertically through a height of 3 m. Calculate its potential energy at this height.

Accepted Answer

12 J

Answer

6 J

Answer

18 J

Answer

24 J

Question 2

Which of the following is a type of energy stored in chemical bonds?

Accepted Answer

Chemical energy

Answer

Kinetic energy

Answer

Potential energy

Answer

Thermal energy

Question 3

Which of the following is an example of a non-conservative force?

Accepted Answer

Friction

Answer

Gravity

Answer

Tension

Answer

Spring force

Question 4

A roller coaster ascends to a height of 20 m and then descends. What type of energy conversion occurs during this process?

Accepted Answer

Potential energy to kinetic energy and vice versa

Answer

Kinetic energy to potential energy and vice versa

Answer

Chemical energy to kinetic energy

Answer

Thermal energy to potential energy

Question 5

Which of the following is the base unit for energy in the International System of Units (SI)?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Volt

Question 6

Which type of energy is an object in motion said to possess due to its motion?

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Elastic energy

Answer

Gravitational energy

Question 7

A ball thrown vertically upward experiences a change in energy as it reaches its highest point. Which of the following energy transformations occurs at this point?

Accepted Answer

Kinetic energy to potential energy

Answer

Potential energy to kinetic energy

Answer

Kinetic energy to thermal energy

Answer

Potential energy to thermal energy

Question 8

Which of the following is the SI unit for measuring power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton-meter

Answer

Kilowatt-hour

Question 9

A machine performs 500 Joules of work with an efficiency of 80%. Determine the amount of energy initially supplied to the machine.

Accepted Answer

625 Joules

Answer

250 Joules

Answer

400 Joules

Answer

800 Joules

Question 10

Which of the following is a form of kinetic energy?

Accepted Answer

Energy due to an object's motion

Answer

Energy stored in a compressed spring

Answer

Energy due to an object's position

Answer

Energy stored in chemical bonds

Question 11

Which of the following is not a factor that affects the rate at which work is done?

Accepted Answer

Efficiency of the system

Answer

Force applied

Answer

Distance moved in the direction of the force

Answer

Time taken

Question 12

Which of the following is an example of a non-conservative force?

Accepted Answer

Friction

Answer

Gravity

Answer

Spring force

Answer

Electrostatic force

Question 13

A ball is thrown vertically upwards with a velocity of 10 m/s. What is its maximum height?

Accepted Answer

5 m

Answer

10 m

Answer

15 m

Answer

20 m

Question 14

Which of the following is a renewable energy source?

Accepted Answer

Wind energy

Answer

Fossil fuels

Answer

Nuclear energy

Answer

Coal

Question 15

What is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Volt

Question 16

An external force of 100 Newtons is applied to an object over a displacement of 5 meters in the opposite direction of its displacement. Calculate the work done by this external force on the object.

Accepted Answer

-500 Joules

Answer

500 Joules

Answer

1000 Joules

Answer

-1000 Joules

Question 17

What is the derived SI unit of work?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Erg

Question 18

Which of the following is NOT a form of energy?

Accepted Answer

Momentum

Answer

Kinetic energy

Answer

Potential energy

Answer

Internal energy

Question 19

Which of the following is an example of a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Air resistance

Answer

Tension

Question 20

Which of the following devices converts electrical energy into mechanical energy?

Accepted Answer

Motor

Answer

Generator

Answer

Transformer

Answer

Capacitor

Question 21

Which of the following is the best way to increase the efficiency of a simple machine?

Accepted Answer

Reduce friction

Answer

Increase the power input

Answer

Decrease the load

Answer

Use lighter materials

Question 22

A wind turbine converts the kinetic energy of the wind into electrical energy. Which of the following is the most important factor affecting the efficiency of a wind turbine?

Accepted Answer

Wind speed

Answer

Blade length

Answer

Turbine height

Answer

Air density

Question 23

Which of the following is the International System of Units (SI) unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Ampere

Question 24

Which of the following forces is conservative?

Accepted Answer

Gravity

Answer

Friction

Answer

Normal reaction

Answer

Air resistance

Question 25

Which device converts electrical energy into mechanical energy?

Accepted Answer

Motor

Answer

Battery

Answer

Resistor

Answer

Solar panel

Question 26

A power plant generates electricity with an efficiency of 40%. If the input power is 10 megawatts, calculate the output power.

Accepted Answer

4 megawatts

Answer

6 megawatts

Answer

8 megawatts

Answer

10 megawatts

Question 27

Which of the following energy transformations takes place in a hydroelectric dam?

Accepted Answer

Kinetic to electrical

Answer

Electrical to potential

Answer

Potential to kinetic

Answer

Thermal to potential

Question 28

A 100 W light bulb is left on for 1 hour. How much energy is consumed?

Accepted Answer

3600 kJ

Answer

100 J

Answer

100 kJ

Answer

360 kJ

Question 29

Which of the following is considered a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Air resistance

Answer

Tension

Question 30

Which unit is used to measure power?

Accepted Answer

Watts

Answer

Joules

Answer

Newtons

Answer

Kilograms

Question 31

Which of the following is not a form of energy?

Accepted Answer

Mass

Answer

Heat

Answer

Light

Answer

Sound

Question 32

The efficiency of a machine is 80%. If the input energy is 1000 J, what is the output energy?

Accepted Answer

800 J

Answer

200 J

Answer

1000 J

Answer

1200 J

Question 33

Which of the following is the SI unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Ampere

Question 34

A constant force of 100 N is applied to an object, causing it to move a distance of 5 meters in the direction of the force. How much work is done?

Accepted Answer

100 J

Answer

10 J

Answer

500 J

Answer

1000 J

Question 35

Friction is an example of a:

Accepted Answer

Non-conservative force

Answer

Conservative force

Answer

Elastic force

Answer

Apparent force

Question 36

The potential energy stored in a spring is given by the equation E = ½kx². What are the units of the spring constant, k?

Accepted Answer

N/m

Answer

m/N

Answer

N/m²

Answer

m/N²

Question 37

Which of the following best describes kinetic energy?

Accepted Answer

Energy possessed by a moving object due to its motion

Answer

Energy stored in an object due to its position or configuration

Answer

Energy released by chemical reactions

Answer

Energy transmitted through electromagnetic waves

Question 38

Which of the following energy transformations occurs in a solar cell?

Accepted Answer

Light to electrical

Answer

Light to chemical

Answer

Chemical to electrical

Answer

Electrical to mechanical

Question 39

The law of conservation of energy states that:

Accepted Answer

Energy can be transferred from one form to another, but the total amount of energy in an isolated system remains constant.

Answer

Energy can be created or destroyed.

Answer

Energy is always lost in any process.

Answer

The efficiency of a machine can never be 100%.

Question 40

Which of the following factors does NOT affect the efficiency of a heat engine?

Accepted Answer

Age of the engine

Answer

Temperature of the heat source

Answer

Temperature of the heat sink

Answer

Type of working fluid

Question 41

Which of the following is NOT a recognized form of energy?

Accepted Answer

Mass

Answer

Kinetic

Answer

Potential

Answer

Chemical

Question 42

Which of the following is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Second

Question 43

Which of the following statements accurately describes energy efficiency?

Accepted Answer

It involves using less energy to perform the same task

Answer

It solely involves utilizing renewable energy sources

Answer

It is only applicable to large-scale industries

Answer

It has no environmental benefits

Question 44

Which of the following is the SI unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Pascal

Question 45

Identify the conservative force among the following:

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Magnetic force

Question 46

The potential energy of an object depends on its:

Accepted Answer

Mass and height

Answer

Mass and velocity

Answer

Velocity and height

Answer

Mass, velocity, and height

Question 47

Explain the relationship between work done and kinetic energy.

Accepted Answer

Work done equals the change in kinetic energy

Answer

Kinetic energy equals the change in work done

Answer

Work done equals half the change in kinetic energy

Answer

Kinetic energy equals half the work done

Question 48

Which of the following is NOT a renewable energy source?

Accepted Answer

Fossil fuels

Answer

Solar energy

Answer

Wind energy

Answer

Hydroelectricity

Question 49

Define the efficiency of a machine.

Accepted Answer

The ratio of output energy to input energy

Answer

The ratio of input energy to output energy

Answer

The ratio of output power to input power

Answer

The ratio of input power to output power

Question 50

What is the SI unit of power?

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Pascal