AnswersAG Q3 Science 8 25-26 ELuxUnit Test

Unit Test — Unit test Answers

15 verified answers
1
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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
2
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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.
3

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
4

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.
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

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
7

What causes the air above a pot of boiling water to become warm?

A
The air transfers thermal energy to the water vapor.
B
The water vapor transfers thermal energy to the air.
C
The particles in the air lose kinetic energy.
D
The particles in the water vapor gain kinetic energy.
8

Which type of energy is transferred by convection currents?

A
chemical
B
thermal
C
potential
D
electrical
9

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.
10

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

e
establishing their thermal equilibrium
i
increasing the area of their contact
u
using objects with similar specific heats
r
reducing the time of their contact
11

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

7
77°F
9
95°F
2
280K
3
300K
12

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.
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

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?

t
the milk
t
the spoon
t
the oatmeal
t
the surrounding air
15

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

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