Unit Test: Water & The Water Cycle
Grade 7 (Science)
Student Name: _________________________
Date: __________________________
Section A: Multiple Choice (10 points)
1) Which of the following is not a source of
surface water?
A. Lakes
B. Rivers
C. Groundwater
D. Oceans
6) What is the primary purpose of
chlorination in water purification?
A. To remove large particles
B. To kill bacteria and pathogens
C. To separate salt from water
D. To remove dissolved gases
2) What is the primary source of freshwater
on Earth?
A. Oceans
B. Groundwater
C. Glaciers and ice caps
D. Atmosphere
7) During which part of the water cycle
does water return to Earth’s surface as
rain, snow, or hail?
A. Evaporation
B. Condensation
C. Precipitation
D. Infiltration
3) Which property of water allows it to
dissolve many substances?
A. Cohesion
B. Adhesion
C. Polarity
D. Density
4) What part of the water cycle involves
water vapor cooling and changing into
liquid droplets?
A. Evaporation
B. Condensation
C. Precipitation
D. Infiltration
5) Which process is used to remove large
particles and impurities from water?
A. Boiling
B. Filtration
C. Chlorination
D. Distillation
8) Which method of water purification
involves heating water until it boils and
then condensing the steam back into a
liquid?
A. Filtration
B. Distillation
C. Chlorination
D. Boiling
9) Groundwater is primarily found in:
A. Rivers
B. Lakes
C. Aquifers
D. Oceans
10) Which part of the water cycle involves
the movement of water through the soil
and into the groundwater system?
A. Evaporation
B. Condensation
C. Precipitation
D. Infiltration
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Section B: Short Answer (10 points)
The diagram shows the water
cycle
1. Name the processes occurring at
X and Y. (2)
X _________________________
Y _________________________
2. Define "precipitation" in the
context of the water cycle. (1)
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3. Name two common uses of water in households. (2)
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4. What is the role of the sun in the water cycle? (1)
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5. Describe one disadvantage of using chlorination to purify water. (1)
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6. What is the process called when water vapor turns directly into ice without becoming a liquid
first? __________________________________ (1)
7. Give 2 reasons why water is important in the human body. (2)
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Section C: Matching (10 points)
Match the terms in Column A with their descriptions in Column B.
Column A
Column B
1) Evaporation ___
A. Water returning to Earth as rain, snow, or hail
2) Condensation ___
B. Water moving through soil into the groundwater system
3) Precipitation ___
C. Process of water vapor cooling into liquid droplets
4) Infiltration___
D. Process of liquid water turning into vapor
5) Aquifer ___
E. Underground layer of water-bearing rock
6) Filtration ___
F. Method of removing large particles from water
7) Chlorination ___
G. Adding chlorine to water to kill bacteria
8) Distillation ___
H. Heating water until it boils and then condensing the steam
9) Boiling ___
I. Heating water to 100°C to kill microorganisms
10) Polarity ___
J. Property of water that makes it a good solvent
Section D: True or False (10 points)
1) Evaporation is the process where water changes from a liquid to a gas. (True/False)
2) Condensation is the process where water changes from a gas to a liquid. (True/False)
3) Precipitation includes rain, snow, sleet, and hail. (True/False)
4) Infiltration is the process of water moving from the surface to the atmosphere. (True/False)
5) Aquifers are a type of surface water. (True/False)
6) Filtration removes dissolved substances from water. (True/False)
7) Chlorination is used to add minerals to water. (True/False)
8) Distillation can remove both large particles and dissolved substances. (True/False)
9) Boiling water at 100°C for 10 minutes will kill most bacteria and pathogens. (True/False)
10) Water’s polarity makes it a poor solvent. (True/False)
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Section E: Extended Response (10 points) CHOOSE 1
Instructions: Choose one of the two questions below and write a detailed response. Each question is worth 10
points. Be sure to support your answer with clear explanations and examples where appropriate.
• Describe the water cycle in detail. Include and label each part of the cycle in your explanation.
• Discuss the different methods of water purification. Explain the advantages and disadvantages of each
method (Boiling, Chlorination, Filtration, Distillation).
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Bonus Points- Answer 1- 2 points each
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What property of water allows it to stick to other substances?
What is an aquifer?
How does boiling purify water?
Name a natural source of groundwater.
Describe one disadvantage of using chlorination to purify water.
How does filtration help in water purification?
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