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.
3

For which function is a heat engine most likely used?

A
starting an air conditioner
B
running a car
C
igniting a furnace
D
activating a thermostat
4

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.
5

Which shows the formula for converting from degrees Celsius to degrees Fahrenheit?

A
°F = (9/5 × °C) +32
B
°F = 5/9 × (°C – 32)
C
°F = °C – 273
D
°F = °C + 273
6

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
7

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.
10

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.
11

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

A
white cement
B
beige sand
C
brown mulch
D
yellow pebbles
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
15

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.
17

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
18

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.
19

Which causes an air conditioner to turn on?

A
House-temperature decreases cause the bimetallic coil to expand or contract.
B
House-temperature decreases cause the bimetallic coil to return to normal.
C
House-temperature increases cause the bimetallic coil to expand or contract.
D
House-temperature increases cause the bimetallic coil to return to normal.
20

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

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