AnswersFL-2002040-MJ Comprehensive Science 1 A-CRUnit Test

Unit Test — Unit test Answers

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What is the unit of measure for energy?

A
watt
B
newtons
C
joules
D
meters per second
2
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Seema knows the mass of a basketball. What other information is needed to find the ball’s potential energy?

A
the volume and height the ball reaches
B
the volume and shape of the ball
C
acceleration due to gravity and the height the ball reaches
D
acceleration due to gravity and the shape of the ball
3

Which set of terms best defines what affects kinetic energy and potential energy, respectively?

A
position, gravity
B
gravity, velocity
C
velocity, height
D
height, position
4

Which two types of potential energies would be types of mechanical energies?

A
electrical and kinetic
B
nuclear and chemical
C
radiant and thermal
D
elastic and gravitational
5

When Javier touches a hot mug of tea, energy is transferred from the surface of the mug to his hand. What kind of energy is this?

A
nuclear
B
radiant
C
thermal
D
chemical
6

Which is occurring when work is being done?

A
Energy is being reverted.
B
Energy is being decreased.
C
Energy is being increased.
D
Energy is being transferred.
7

When a spring is compressed, the energy changes from kinetic to potential. Which best describes what is causing this change?

A
work
B
power
C
gravitational energy
D
chemical energy
8

The table shows information about four students who are running around a track. Which statement is supported by the information in the chart?

Question illustration
A
Autumn has more kinetic energy than Chiang.
B
Mohammed has less kinetic energy than Autumn.
C
Lexy has more kinetic energy than Mohammed.
D
Chiang has less kinetic energy than Lexy.
9

If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?

A
Total energy increases.
B
Stored energy decreases.
C
Energy of motion decreases.
D
Total energy decreases.
10

This diagram shows a skier moving down a hill.

Question illustration
A
The skier has potential and kinetic energy.
B
The skier has only potential energy.
C
The skier has only kinetic energy.
D
The skier does not have potential or kinetic energy.
11

Which two factors are used to calculate the kinetic energy of an object?

A
gravity and velocity
B
velocity and mass
C
mass and volume
D
volume and height
12

The diagram shows a ball resting at the top of a hill.

Question illustration
A
The potential energy in the system is greatest at X.
B
The kinetic energy in the system is greatest at X.
C
Total energy in the system decreases as the ball moves from X to Y.
D
Total energy in the system increases as the ball moves from X to Y.
13

The sun emits electromagnetic waves at many frequencies, but mostly in the infrared, visible, and ultraviolet spectrums. What kind of energy is this?

A
nuclear
B
radiant
C
thermal
D
chemical
14

A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled’s potential energy? (Formula: PE = mgh)

A
90 J
B
56.8 J
C
441 J
D
882 J
15

What is the energy of an object because of its potential and kinetic energies?

A
chemical energy
B
electrical energy
C
nuclear energy
D
mechanical energy
16

A roller coaster with a potential energy of 235,200 J sits at the top of a 30 m high hill. What is the mass of the roller coaster? (Formula: PE = mgh)

A
800 kg
B
7,840 kg
C
8,000 kg
D
78,400 kg
17

A car is moving at 12 m/s and has a mass of 600 kg. What is the kinetic energy of the car? (Formula: )

Question illustration
A
36,300 J
B
43,200 J
C
72,600 J
D
86,400 J
18

Ella has a mass of 56 kg, and Tyrone has a mass of 68 kg. Ella is standing at the top of a skateboard ramp that is 1.5 meters tall. Which conclusion is best supported by the given information?

A
If Tyrone stands at the top of the same ramp, his potential energy will be less than Ella’s.
B
If Tyrone stands at the top of a 1 m high ramp, his potential energy will be greater than Ella’s.
C
If Tyrone stands at the top of the same ramp, his potential energy will be the same as Ella’s.
D
If Tyrone stands at the top of a 2 m high ramp, his potential energy will be greater than Ella’s.
19

What is the kinetic energy of a ball with a mass of 0.5 kg and a velocity of 10 m/s? (Formula:)

Question illustration
A
25 J
B
5 J
C
50 J
D
100 J
20

Four people make observations recorded in the table.Which best describes what the observations have in common?

Question illustration
A
They involve nuclear energy.
B
They involve radiant energy.
C
They involve changes in waves.
D
They involve changes in energy.

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