AnswersPBCSD_Grade_Forgiveness_2003310_Physical Science_S2_2022Unit Test

Unit Test — Unit test Answers

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1
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Heat transfer between two substances is affected by specific heat and the

A
chemical composition of the substances.
B
state of matter of the substances at room temperature.
C
thermal equilibrium of the substances.
D
amount of time and area of physical contact between the substances.
2
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Which of these indicates that a liquid has transferred thermal energy to the air?

A
The liquid increases in temperature, and its particles lose kinetic energy.
B
The liquid decreases in temperature, and its particles gain kinetic energy.
C
The liquid increases in temperature, and its particles gain kinetic energy.
D
The liquid decreases in temperature, and its particles lose kinetic energy.
3

Nuclear reactions in a reactor produce a lot of thermal energy. That energy then flows and warms up water, which boils and produces steam. The steam then turns turbines that generate electricity.

A
Heat flows in the form of electricity.
B
Heat flows from the reactor to the water.
C
The water produces heat.
D
The steam produces heat.
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

Which material is typically used as a thermal insulator?

A
copper
B
foam
C
ceramic
D
aluminum
6

Which describes how radiation moves?

A
Radiation moves from a cooler object to a warmer object
B
Radiation moves from a warmer object to a cooler object
C
Radiation moves from a warm object to an object of the same temperature
D
Radiation moves from a cool object to an object of the same temperature
7

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.
9

In which of these can convection not occur?

A
gases
B
solids
C
liquids
D
fluids
10

Which material most likely gets the warmest when placed in the Sun?

A
white cement
B
beige sand
C
brown mulch
D
yellow pebbles
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

Evan drew a diagram to illustrate radiation.

Question illustration
A
gases mixing with particles
B
liquid moving through a vacuum
C
moving particles
D
electromagnetic waves
13

Carmen is heating some water and trying to measure the temperature of water using a Celsius thermometer. Which measurement can she expect once the water begins to boil?

A
32°C
B
100° C
C
212°C
D
373°C
14

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
15

Which of these results in kinetic energy of an object?

A
position
B
motion
C
mass
D
volume
17

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.
18

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
19

Which refers to the thermal energy that flows from one substance to another when the substances differ in temperature?

A
heat
B
temperature
C
convection
D
flow
20

A stovetop burner on medium reaches 95°C. Which will also receive a flow of heat directly from the burner?

A
the surrounding air
B
a burner at the same temperature
C
a pan heated to 100°C
D
hotter water inside a pan
22

What is the temperature, in degrees Celsius, of a substance with a temperature of 49K?

A
–322°C
B
–224°C
C
224°C
D
322°C
23

How does radiation help treat cancer?

A
It cools down the cancer cells and weakens them.
B
It cools down the non-cancerous cells and strengthens them.
C
It heats up the cancer cells and weakens them.
D
It heats up the non-cancerous cells and strengthens them.

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