Work and Energy: Master the Concepts with Engaging Quizzes

Question 1

What is the SI unit of work?

Accepted Answer

Joule (J)

Answer

Newton (N)

Answer

Watt (W)

Answer

Kilogram (kg)

Question 2

A spring with a spring constant 'k' is stretched by a distance 'x'. What is the potential energy stored in the spring?

Accepted Answer

kx^2/2

Answer

kx

Answer

2kx

Answer

kx^3

Question 3

Which of the following is a non-renewable energy source?

Accepted Answer

Fossil fuels

Answer

Solar energy

Answer

Wind energy

Answer

Hydroelectric energy

Question 4

The efficiency of a machine is defined as the ratio of:

Accepted Answer

Output work to Input work

Answer

Input work to Output work

Answer

Work done to Input energy

Answer

Input energy to Work done

Question 5

A ball is dropped from a height 'h'. What is its velocity when it hits the ground?

Accepted Answer

√(2gh)

Answer

2gh

Answer

gh

Answer

√(gh)

Question 6

What is the SI unit of power?

Accepted Answer

Watt (W)

Answer

Joule (J)

Answer

Newton (N)

Answer

Kilogram (kg)

Question 7

A ball is launched straight up with an initial velocity of 10 meters per second. What is its kinetic energy at the highest point of its trajectory?

Accepted Answer

0 J

Answer

10 J

Answer

50 J

Answer

100 J

Question 8

The unit of work in the International System of Units (SI) is:

Accepted Answer

Joule

Answer

Newton²

Answer

Watt

Answer

Kilowatt-hour

Question 9

At the highest point of its trajectory, a vertically launched ball has:

Accepted Answer

Maximum potential energy

Answer

Maximum kinetic energy

Answer

Maximum total energy

Answer

Zero kinetic energy

Question 10

Which of the following forces is non-conservative?

Accepted Answer

Friction

Answer

Gravity

Answer

Tension

Answer

Elasticity

Question 11

The power of a motor is the rate at which it does:

Accepted Answer

Work

Answer

Energy

Answer

Force

Answer

Momentum

Question 12

Which of the following energy sources is renewable?

Accepted Answer

Solar energy

Answer

Coal

Answer

Natural gas

Answer

Nuclear energy

Question 13

The unit for measuring power is the:

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Kilogram

Question 14

Which of the following is NOT a form of energy?

Accepted Answer

Mass

Answer

Kinetic energy

Answer

Potential energy

Answer

Heat

Question 15

What is the standard international unit for quantifying energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Ampere

Question 16

An object with a mass of 2 kilograms travels at a velocity of 5 meters per second. Calculate its kinetic energy.

Accepted Answer

25 J

Answer

10 J

Answer

50 J

Answer

100 J

Question 17

A roller coaster car at the top of a hill rolls down and reaches the bottom. What happens to its energy during this process?

Accepted Answer

Potential energy decreases, kinetic energy increases.

Answer

Kinetic energy decreases, potential energy increases.

Answer

Total energy remains constant.

Answer

Both kinetic and potential energy decrease.

Question 18

A force of 10 Newtons is applied to an object over a distance of 5 meters. Calculate the work done.

Accepted Answer

10 J

Answer

25 J

Answer

50 J

Answer

100 J

Question 19

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

Accepted Answer

Friction

Answer

Gravity

Answer

Spring force

Answer

Electrostatic force

Question 20

Which quantity is a vector?

Accepted Answer

Displacement

Answer

Mass

Answer

Energy

Answer

Temperature

Question 21

An object with mass 'm' is moving with a velocity 'v'. What is its kinetic energy?

Accepted Answer

1/2 mv^2

Answer

mv

Answer

1/2 m^2v

Answer

m^2v^2

Question 22

A ball is thrown vertically upward. At its maximum height, what form of energy does it possess?

Accepted Answer

Potential energy only

Answer

Kinetic energy only

Answer

Both kinetic and potential energy

Answer

Neither kinetic nor potential energy

Question 23

Which of the following is NOT a conservative force?

Accepted Answer

Frictional force

Answer

Gravitational force

Answer

Elastic force

Answer

Tension force

Question 24

A rollercoaster begins its descent from rest at the top of a hill. As it descends, its potential energy decreases. Where does this energy go?

Accepted Answer

It is transformed into kinetic energy.

Answer

It is lost to friction.

Answer

It remains as potential energy.

Answer

It is converted into gravitational energy.

Question 25

A person lifts a box vertically at a constant velocity. Is the person doing work on the box?

Accepted Answer

Yes, because the box is lifted against gravity.

Answer

No, because the box is not accelerating.

Answer

Yes, but only if the box is lifted a significant distance.

Answer

No, because the force applied by the person is perpendicular to the displacement of the box.

Question 26

Which of the following statements regarding energy is accurate?

Accepted Answer

Energy can be transformed from one form to another, but cannot be created or destroyed.

Answer

Energy can be created and destroyed.

Answer

Energy is always conserved in open systems.

Answer

Energy is a vector quantity.

Question 27

A spring is stretched 'x' meters from its equilibrium position. What is the potential energy stored in the spring?

Accepted Answer

1/2 kx^2

Answer

kx

Answer

1/2 k^2x

Answer

kx^3

Question 28

A pendulum swings back and forth. At the bottom of its swing, which type of energy does it have the most of?

Accepted Answer

Kinetic energy

Answer

Potential energy

Answer

Both kinetic and potential energy

Answer

Neither kinetic nor potential energy

Question 29

Which of the following is a non-renewable energy source?

Accepted Answer

Fossil fuels

Answer

Nuclear energy

Answer

Solar energy

Answer

Wind energy

Question 30

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

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Ampere

Question 31

A ball is thrown vertically upwards. At the peak of its trajectory, which statement is true?

Accepted Answer

Kinetic energy is zero while potential energy is maximum

Answer

Kinetic energy is maximum while potential energy is zero

Answer

Both kinetic and potential energies are zero

Answer

Both kinetic and potential energies are maximum

Question 32

A car travels at a constant speed on a level road. Which of the following statements is true regarding the work done by the engine?

Accepted Answer

Work done by the engine is equal to the work done by friction

Answer

Work done by the engine is zero

Answer

Work done by the engine is equal to the kinetic energy of the car

Answer

Work done by the engine is equal to the potential energy of the car

Question 33

Which of the following is not a form of energy?

Accepted Answer

Velocity

Answer

Kinetic energy

Answer

Potential energy

Answer

Heat energy

Question 34

A roller coaster car is at the top of a hill. Which of the following statements is true?

Accepted Answer

Kinetic energy is minimum while potential energy is maximum

Answer

Kinetic energy is maximum while potential energy is minimum

Answer

Both kinetic and potential energies are maximum

Answer

Both kinetic and potential energies are minimum

Question 35

A ball is dropped from a height of 10 meters. What is its kinetic energy just before it hits the ground?

Accepted Answer

100 J

Answer

10 J

Answer

20 J

Answer

50 J

Question 36

Which of the following is the SI unit of power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Ampere

Question 37

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

Accepted Answer

Velocity

Answer

Kinetic energy

Answer

Potential energy

Answer

Electrical energy

Question 38

An object is launched vertically upward. At its highest point, which type of energy is at its maximum?

Accepted Answer

Potential energy

Answer

Kinetic energy

Answer

Gravitational potential energy

Answer

Mechanical energy

Question 39

What is the SI unit of work?

Accepted Answer

Joule

Answer

Watt

Answer

Newton

Answer

Horsepower

Question 40

Which statement best describes the law of conservation of energy?

Accepted Answer

Energy can be transformed from one form to another.

Answer

Energy can be created or destroyed.

Answer

Energy can be lost or gained.

Answer

Energy is always constant.

Question 41

Which of the following factors does NOT affect the potential energy of an object?

Accepted Answer

Velocity

Answer

Mass

Answer

Height

Answer

Gravitational field strength

Question 42

Which device converts electrical energy into mechanical energy?

Accepted Answer

Electric motor

Answer

Solar panel

Answer

Generator

Answer

Battery

Question 43

A flywheel stores energy in the form of what?

Accepted Answer

Rotational kinetic energy

Answer

Linear kinetic energy

Answer

Potential energy

Answer

Thermal energy

Question 44

A ball of mass m = 2 kg is lifted to a height of h = 10 m. What is the potential energy stored in the ball?

Accepted Answer

196 J

Answer

98 J

Answer

784 J

Answer

392 J

Question 45

A pendulum swings from one extreme to the other. At the bottom of its swing, it has a kinetic energy of 10 J. What is its potential energy at the top of its swing, assuming no energy dissipation?

Accepted Answer

10 J

Answer

5 J

Answer

20 J

Answer

15 J

Question 46

A roller coaster car is at the top of a hill with potential energy of 2000 J. As it rolls down the hill, its potential energy decreases. What happens to the kinetic energy of the car?

Accepted Answer

Increases

Answer

Decreases

Answer

Becomes negative

Answer

Remains the same

Question 47

A ball is thrown vertically upwards with an initial velocity of v = 10 m/s. What is its kinetic energy at its maximum height?

Accepted Answer

0 J

Answer

150 J

Answer

50 J

Answer

100 J

Question 48

A block of mass m = 2 kg slides down a frictionless inclined plane from a height of h = 5 m. What is its speed at the bottom of the plane?

Accepted Answer

10 m/s

Answer

5 m/s

Answer

15 m/s

Question 49

A 10 kg object is moving at a speed of v = 5 m/s. What is its kinetic energy?

Accepted Answer

125 J

Answer

50 J

Answer

100 J

Answer

25 J

Question 50

A book of mass m = 2 kg is lifted h = 1 meter above a table. What is its potential energy?

Accepted Answer

19.6 J

Answer

4.9 J

Answer

9.8 J

Answer

24.5 J

Question 51

A roller coaster car starts at the top of a hill with a height of h = 30 meters. What is its speed at the bottom of the hill, assuming no friction?

Accepted Answer

24.3 m/s

Answer

12.1 m/s

Answer

48.6 m/s

Answer

36.4 m/s

Question 52

Which of the following is NOT a form of energy?

Accepted Answer

Pressure

Answer

Kinetic

Answer

Thermal

Answer

Potential

Question 53

A person does W = 200 J of work on a box by pushing it d = 10 meters. What is the force applied by the person?

Accepted Answer

20 N

Answer

10 N

Answer

30 N

Answer

40 N

Question 54

Which of the following is a unit of work?

Accepted Answer

Joule

Answer

Newton

Answer

Kelvin

Answer

Watt

Question 55

A car travels 100 km in 2 hours. What is its average power?

Accepted Answer

13.9 kW

Answer

27.8 kW

Answer

6.9 kW

Answer

41.7 kW

Question 56

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Nuclear energy

Answer

Natural gas

Answer

Coal

Question 57

What is the efficiency of a machine that does 500 J of work and consumes 1000 J of energy?

Accepted Answer

50%

Answer

100%

Answer

25%

Answer

75%

Question 58

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

Accepted Answer

Friction

Answer

Elasticity

Answer

Gravity