Work and Energy: Interactive Learning Quizzes for Biology Majors

Question 1

Which of the following is the SI unit of work?

Accepted Answer

Joule

Answer

Newton-meter

Answer

Watt

Answer

Horsepower-hour

Question 2

Which of the following is not considered a form of energy?

Accepted Answer

Momentum

Answer

Kinetic energy

Answer

Thermal energy

Answer

Gravitational energy

Question 3

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 remains constant.

Answer

Energy can be created or destroyed.

Answer

Energy is always constant.

Answer

Energy changes direction, but not magnitude.

Question 4

The power of an engine is measured in:

Accepted Answer

Watts

Answer

Joules

Answer

Newtons

Answer

Horsepower

Question 5

An object experiences a change in velocity from 10 m/s to 20 m/s. Calculate the change in its kinetic energy.

Accepted Answer

400 J

Answer

100 J

Answer

200 J

Answer

800 J

Question 6

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

Accepted Answer

Temperature

Answer

Mass

Answer

Height

Answer

Acceleration due to gravity

Question 7

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

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Coulomb

Question 8

A ball is thrown vertically upward. At its maximum height, which of the following is true?

Accepted Answer

Potential energy is maximum and kinetic energy is minimum.

Answer

Kinetic energy is maximum and potential energy is minimum.

Answer

Both kinetic and potential energies are zero.

Answer

Both kinetic and potential energies are maximum.

Question 9

A car accelerates from rest. Which of the following is the best description of the net work done on the car?

Accepted Answer

Positive work is done by the engine and negative work is done by friction.

Answer

Positive work is done by friction and negative work is done by the engine.

Answer

Both the engine and friction do positive work.

Answer

Both the engine and friction do negative work.

Question 10

A spring is stretched by a certain distance. Which of the following represents the potential energy stored in the spring?

Accepted Answer

1/2kx^2

Answer

kx

Answer

kx^2

Answer

1/kx^2

Question 11

A pendulum swings from one extreme to the other. At the bottom of its swing, which of the following forces does the most work?

Accepted Answer

Gravity

Answer

Tension

Answer

Air resistance

Answer

Normal force

Question 12

A force of 10 N is applied to a block of mass 2 kg over a distance of 5 m. Calculate the work done on the block:

Accepted Answer

20 J

Answer

10 J

Answer

50 J

Answer

100 J

Question 13

The power required to lift an object of mass m to a height h in time t is:

Accepted Answer

mgh/t

Answer

mgt/h

Answer

hmg/t

Answer

tmg/h

Question 14

In a muscle contraction, what energy conversion takes place?

Accepted Answer

Chemical energy to kinetic energy

Answer

Kinetic energy to potential energy

Answer

Potential energy to chemical energy

Answer

Thermal energy to electrical energy

Question 15

The SI unit of work is:

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kelvin

Question 16

Which of the following is NOT a form of energy?

Accepted Answer

Wavelength

Answer

Kinetic energy

Answer

Potential energy

Answer

Heat

Question 17

What is the relationship between work and energy?

Accepted Answer

Work is always converted into energy

Answer

Work can create or destroy energy

Answer

Energy can create or destroy work

Answer

Work and energy are unrelated concepts

Question 18

Which of the following statements about power is accurate?

Accepted Answer

Power is the rate at which work is done

Answer

Power is the rate at which energy is stored

Answer

Power is the total amount of work done

Answer

Power is the total amount of energy possessed

Question 19

Which of the following is NOT a law of thermodynamics?

Accepted Answer

Heat can spontaneously flow from a colder to a hotter object

Answer

Energy cannot be created or destroyed

Answer

Entropy always increases

Answer

The total energy of an isolated system remains constant

Question 20

How does the principle of energy conservation apply to biological systems?

Accepted Answer

The total energy of a living organism remains constant

Answer

Living organisms can create energy from nothing

Answer

Energy is not conserved in metabolic processes

Answer

Energy can be stored indefinitely in biological molecules without loss

Question 21

Which of the following is the SI unit of work?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilocalorie

Question 22

Which option below is NOT a form of energy?

Accepted Answer

Momentum

Answer

Kinetic energy

Answer

Potential energy

Answer

Thermal energy

Question 23

The work-energy theorem states that the net work done on an object is equal to its:

Accepted Answer

Change in energy

Answer

Change in momentum

Answer

Change in position

Answer

Change in velocity

Question 24

Power is defined as:

Accepted Answer

Rate of doing work

Answer

Amount of work done

Answer

Efficiency of the machine

Answer

Force applied to the machine

Question 25

Which of the following units is used to measure power?

Accepted Answer

Watt

Answer

Joule

Answer

Newton

Answer

Kilocalorie per hour

Question 26

The efficiency of a machine is determined by:

Accepted Answer

Output power / Input power

Answer

Input power / Output power

Answer

Output work / Input work

Answer

Input work / Output work

Question 27

What is the standard International System (SI) unit for measuring work?

Accepted Answer

Joule

Answer

Newton-meter

Answer

Erg

Answer

Kilogram-meter

Question 28

Which of the following describes the energy associated with an object's motion?

Accepted Answer

Kinetic energy

Answer

Gravitational potential energy

Answer

Chemical energy

Answer

Elastic potential energy

Question 29

Which fundamental principle states that the total energy of an isolated system remains constant?

Accepted Answer

Law of Conservation of Energy

Answer

First Law of Thermodynamics

Answer

Newton's Second Law of Motion

Answer

Maxwell's Equations

Question 30

Which of the following is NOT considered a form of mechanical energy?

Accepted Answer

Thermal energy

Answer

Kinetic energy

Answer

Potential energy

Answer

Elastic energy

Question 31

The SI unit of work is the:

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Horsepower

Question 32

The kinetic energy of an object is directly proportional to its:

Accepted Answer

Velocity

Answer

Mass

Answer

Acceleration

Answer

Displacement

Question 33

The SI unit of power is the:

Accepted Answer

Watt

Answer

Newton

Answer

Joule

Answer

Horsepower

Question 34

Which of the following is an example of the work-energy theorem applied in biology?

Accepted Answer

Muscle contraction

Answer

Diffusion

Answer

Photosynthesis

Answer

Respiration

Question 35

Which of the following is the SI unit of work?

Accepted Answer

Joule

Answer

Newton-meter

Answer

Watt-hour

Question 36

The kinetic energy of an object is given by the formula:

Accepted Answer

1/2 mv^2

Answer

1/4 mv^4

Answer

2mv

Answer

mv^3

Question 37

Which of the following is a non-conservative force?

Accepted Answer

Friction

Answer

Spring force

Answer

Gravity

Answer

Elastic force

Question 38

The formula for power is:

Accepted Answer

Work / Time

Answer

Energy × Time

Answer

Force × Velocity

Answer

Mass × Acceleration

Question 39

What is the efficiency of a machine that converts 60 J of work input into 45 J of work output?

Accepted Answer

75%

Answer

100%

Answer

50%

Answer

25%

Question 40

A ball is thrown vertically upwards. What is its kinetic energy at its peak height?

Accepted Answer

0 J

Answer

Maximum

Answer

Half its initial kinetic energy

Answer

Equal to its potential energy

Question 41

As a roller coaster car descends from the top of a hill, what occurs to its potential and kinetic energy?

Accepted Answer

Potential energy decreases while kinetic energy increases.

Answer

Potential energy increases while kinetic energy decreases.

Answer

Both potential and kinetic energy increase.

Question 42

When a spring is compressed and stores potential energy, what happens to this energy when the spring is released?

Accepted Answer

It transforms into kinetic energy.

Answer

It dissipates as heat.

Answer

It continues to increase.

Answer

It remains stored in the spring.

Question 43

Muscle cells utilize ATP for contraction. This process exemplifies which type of energy conversion?

Accepted Answer

Chemical energy to mechanical energy

Answer

Heat energy to mechanical energy

Answer

Mechanical energy to chemical energy

Answer

Light energy to chemical energy

Question 44

A pendulum swings back and forth. At what point in its swing does the pendulum possess maximum potential energy?

Accepted Answer

At the highest point of its swing.

Answer

At the lowest point of its swing.

Answer

At the midpoint of its swing.

Answer

Potential energy is constant throughout the swing.

Question 45

A ball is launched vertically upwards with some initial velocity. As it rises, what happens to its kinetic and potential energy?

Accepted Answer

Kinetic energy decreases, potential energy increases.

Answer

Kinetic energy and potential energy decrease.

Answer

Kinetic energy and potential energy increase.

Answer

Kinetic energy increases and potential energy decreases.

Question 46

A car with a mass of 1200 kg is travelling at a velocity of 25 m/s. What is its kinetic energy?

Accepted Answer

187,500 J

Answer

12,000 J

Answer

50,000 J

Answer

375,000 J

Question 47

An AC generator converts mechanical energy into which of the following?

Accepted Answer

Electrical energy

Answer

Heat energy

Answer

Light energy

Answer

Force

Question 48

A ball is thrown horizontally from a height of 20 meters. Ignoring air resistance, what happens to its total mechanical energy as it falls?

Accepted Answer

It remains constant.

Answer

It becomes zero.

Answer

It decreases.

Answer

It increases.

Question 49

During photosynthesis, plants convert what form of energy into chemical energy?

Accepted Answer

Light energy

Answer

Thermal energy

Answer

Electrical energy

Question 50

Which of the following is a unit of energy?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Meter