AnswersPA-Science 8 Q1Radiation

Radiation — Unit test Answers

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1
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Which type of energy is transferred by convection currents?

A
chemical
B
thermal
C
potential
D
electrical
2
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A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula: PE = mgh)

A
3.9 m
B
4.0 m
C
39.2 m
D
40.0 m
3

Which is an example of potential energy?

A
a swimmer kicking their legs
B
a car driving on the road
C
an arrow flying at a target
D
a yo-yo in someone’s hand
4

Four students are carrying out different laboratory procedures.Piroja is mixing baking soda and vinegar to see if it reacts.Jason is heating salt water over a burner until the water evaporates.Kali is putting crushed ice and ice cubes on a table to see which melts first.Francisco is separating iron filings from sand using a magnet.

A
Piroja’s experiment
B
Jason’s experiment
C
Kali’s experiment
D
Francisco’s experiment
5

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.
6

The total energy in a system is 675 J. The kinetic energy changes from 296 J to 432 J. Which statement best describes the potential energy of this system?

A
It changes from 296 J to 432 J.
B
It changes from 379 J to 243 J.
C
It changes from 432 J to 296 J.
D
It changes from 243 J to 379 J.
7

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.
8

Which of these prevents conduction from occurring?

A
equal masses
B
different masses
C
equal temperatures
D
different temperatures
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 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
11

Kyle has a mass of 54 kg and is jogging at a velocity of 3 m/s. What is Kyle’s kinetic energy? (Formula: )

Question illustration
A
18 J
B
81 J
C
162 J
D
243 J
12

Jin listed some common thermal insulators and conductors in a chart.Which belongs in the area marked with an X?

Question illustration
A
iron
B
foam
C
wood
D
glass
13

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
14

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
15

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.

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Radiation — Unit test Answers — PA-Science 8 Q1