AnswersMHS - Physical Science - S1 - CRUnit Test

Unit Test — Unit test Answers

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Simone created a chart to summarize the energy transformations that take place when energy from the wind is used to generate electricity.Which best completes the chart?

Question illustration
A
nuclear energy transformed to electrical energy
B
chemical energy transformed to electrical energy
C
radiant energy transformed to mechanical energy
D
kinetic energy transformed to mechanical energy
2
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What is the source of almost all energy on Earth?

A
Earth’s hot core
B
the Sun
C
stored carbon
D
moving water
3

A scientist designed a foam container to help keep frozen foods from melting. Which best explains how the foam works?

A
It removes thermal energy from the air inside the container.
B
It removes thermal energy from the frozen foods inside the container.
C
It reduces the amount of thermal energy that is transferred from inside to outside the container.
D
It reduces the amount of thermal energy that is transferred from outside to inside the container.
4

Which accurately completes the statement?Conduction involves the transfer of electric charge or ___________ due to the movement of particles.

A
thermal energy
B
light waves
C
protons
D
neutrons
5

A student heats a liquid on a burner. What happens to the portion of liquid that first begins to warm?

A
It loses energy.
B
It becomes less dense.
C
It sinks downward.
D
Its molecules get closer together.
6

The diagram shows currents that form as water is heated.

Question illustration
A
the air above a wildfire
B
a carton of milk in a refrigerator
C
a snowdrift on a shady mountainside
D
a boulder in a hot desert
7

Which material is typically used as a thermal insulator?

A
copper
B
foam
C
ceramic
D
aluminum
8

When a person strikes and lights a match, potential energy in the match is transformed into which types of energy?

A
electrical and thermal
B
thermal and radiant
C
radiant and nuclear
D
nuclear and kinetic
9

The diagram shows movement of thermal energy.

Question illustration
A
W and X
B
X and Z
C
Y and Z
D
Z and W
10

In which of these can convection not occur?

A
gases
B
solids
C
liquids
D
fluids
11

Which best describes convection?

A
It relies on the collision of particles within or between substances.
B
It occurs in solids, liquids, or gases that are heated.
C
It results when portions of a liquid cool and rise.
D
It is driven by temperature differences within a fluid.
12

As a person pushes a box across a floor, the energy from the person’s moving arm is transferred to the box, and the box and the floor become warm. During this process, what happens to energy?

A
It is increased.
B
It is conserved.
C
It is decreased.
D
It is created.
13

When Xavier places his hands near a light bulb, he notices that certain areas around the light bulb are warmer than others. Which best explains this?

A
The areas to the sides of the light bulb are warmest because of conduction.
B
The areas to the sides of the light bulb are warmest because of convection.
C
The area directly above the light bulb is warmest because of conduction.
D
The area directly above the light bulb is warmest because of convection.
14

What happens in terms of energy when a moving car hits a parked car, causing the parked car to move?

A
The moving car transfers kinetic energy to the parked car.
B
Kinetic energy in the moving car disappears.
C
Kinetic energy in the parked car is created.
D
The parked car transfers kinetic energy to the moving car.
15

Val warms up some soup on the stove. Assuming no phase change has occurred, what effect does warming have on the soup?

A
Its particles have less kinetic energy.
B
Its particles have more kinetic energy.
C
Its specific heat increases.
D
Its specific heat decreases.
16

Selma made a diagram to compare convection and radiation.

Question illustration
A
Must involve temperature differences between substances or objects
B
Only occurs when molecules are in direct contact
C
Involves the movement of fluids based on density differences
D
Can occur where there is little or no matter
17

It requires 2,500 joules to raise a certain amount of water (c = 4.186 J/g°C) from 20.0°C to 60.0°C.

A
15 g
B
40 g
C
63 g
D
80 g
18

Where could convection currents form?

A
in a sand dune
B
on a pavement
C
in the atmosphere
D
in outer space
19

Water is boiling in a clear pot, as shown in the picture.

Question illustration
A
They are more spread out and moving faster than those at the surface.
B
They are closer together and moving faster than those at the surface.
C
They are more spread out and moving slower than those at the surface.
D
They are closer together and moving slower than those at the surface.
20

Jared made a study chart about heat, temperature, kinetic energy, and thermal energy.

Question illustration
A
Add “potential energy” to the description of temperature.
B
Switch the term “heat” with the term “thermal energy.”
C
Change kinetic energy description from “energy of motion” to “stored energy.”
D
Replace the term “temperature” with “internal energy.”

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