AnswersFall 24 GSE Physical Science B ICRadiation

Radiation — Unit test Answers

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Cindy pours cool milk into a hot bowl of oatmeal and then stirs it with a room-temperature spoon. Which substance will have heat flow from it to the other substances?

A
the milk
B
the spoon
C
the oatmeal
D
the surrounding air
2
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Which is an example of radiation?

A
A melting snowman sweats drop of water under a bright sun.
Option A
B
A smiling man roasts marshmallows over a wood fire.
Option B
C
A cook stirs vegetables in a frying pan over a gas burner.
Option C
D
Three pairs of bare feet and lower legs walk across black pavement.
Option D
3

At the coast on a summer day, the land is hotter than the ocean. Warm air over the land rises and is replaced by cooler air, causing a sea breeze. At night, the land cools quickly and the ocean is now warmer than the land. What will happen next?

Question illustration
A
Winds will stop blowing as the convection current ceases to flow.
B
The convection current will reverse direction, reversing the winds.
C
Winds will increase as the two convection currents overlap.
D
The convection current will move seaward, reversing the winds.
4

Which is equal to a temperature of 20°C?

A
20°F
B
68°F
C
36°F
D
32°F
5

Which statement best describes heat and thermal energy?

A
They are different words for the same thing.
B
They represent different concepts.
C
Heat is what happens when thermal energy stops moving between substances.
D
Thermal energy is what happens when heat moves between substances.
6

Allison drew a diagram to illustrate radiation.

Question illustration
A
X: MatterY: Empty space
B
X: Large massY: Small mass
C
X: HotY: Cold
D
X: EarthY: Sun
7

Which is the correct order of materials in terms of reflectivity, from least to greatest?

A
brown soil, beige sand, white paper, black asphalt
B
white paper, beige sand, brown soil, black asphalt
C
black asphalt, brown soil, beige sand, white paper
D
beige sand, white paper, black asphalt, brown soil
8

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

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

Which indicates that thermal energy is no longer being transferred from boiling water to a mug?

A
The mug and the water lose all thermal energy.
B
The water is hotter than the mug.
C
The mug is hotter than the water.
D
The water and the mug are the same temperature.
10

Which material would result in the least amount of energy transfer?

A
A reflector that is dark in color and smooth.
B
An absorber that is light in color and rough.
C
An absorber that is dark in color and rough.
D
A reflector that is light in color and smooth.
11

Which type of energy is transferred by convection currents?

A
chemical
B
thermal
C
potential
D
electrical
12

Which occurs when a warm fluid cools down?

A
Energy is released to the environment.
B
Energy is absorbed from the environment.
C
The density of the fluid decreases.
D
The mass of the fluid decreases.
13

Which condition must be met for conduction to occur?

A
particles must be large
B
particles must be small
C
particles must be in contact
D
particles must be spread apart
14

At which temperature does water have particles with a greater average kinetic energy than water with a temperature of 30°C?

A
77°F
B
95°F
C
280K
D
300K
15

Which of these actions would increase heat transfer between two objects?

A
establishing their thermal equilibrium
B
increasing the area of their contact
C
using objects with similar specific heats
D
reducing the time of their contact

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