Class 7 chemistry MCQs with answers are provided here for Chapter 16, Water: A Precious Resource. These MCQs are based on the CBSE board curriculum and correspond to the most recent Class 7 chemistry syllabus. By practising these Class 7 multiple choice questions, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 7 annual examinations as well as other competitive exams.
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Class 7 Water A Precious Resource MCQs
1. Which of the following is not a freshwater resource?
a) River
b) Groundwater
c) Ocean
d) None of the above
Answer: c
Explanation: Ocean water is not a freshwater resource as it contains 97% salt. Thus, it is unsuitable for drinking or growing crops.
2. The upper level of groundwater is called _______.
a) Water cycle
b) Water table
c) Aqua cycle
d) None of the above
Answer: b
Explanation: The water table refers to the upper level of the groundwater. At this level, the rocks or soil are perpetually saturated with water.
3. Which of the following does not help in replenishing groundwater?
a) Deforestation
b) Increasing population
c) Industries
d) All of the above
Answer: d
4. A substance causing pollution is known as _______.
a) Pollutant
b) Water table
c) Hail
d) None of the above
Answer: a
Explanation: Pollutant is a substance that harms the suitability of the resources. It can be both naturally occurring or anthropogenic in origin.
5. Water exists in ______ states.
a) One
b) Two
c) Three
d) Four
Answer: c
Explanation: Water exists in three physical states – solid, liquid, and water vapour (gaseous).
6. Which of the following is considered the purest form of water?
a) Rainwater
b) Groundwater
c) Glacier water
d) None of the above
Answer: a
Explanation: Rainwater is considered the purest form of water, as, during vapourisation, impurities and salts present in water are left behind. However, the rainwater we get is not certainly pure, as it carries down contaminants and particles from the atmosphere.
7. Which of the following is the largest reservoir of potable water?
a) Ocean water
b) Groundwater
c) River water
d) None of the above
Answer: b
Explanation: Water covers nearly 71% of the earth’s surface. Of this, 96.5% of water is present in the oceans, whereas 3.5% is fresh water. 2.5% of fresh water is present in the form of ice in glaciers (unavailable to use), whereas 0.75% of water is present in the ground as groundwater, and the remaining water is present in river ponds or lakes. Thus, groundwater is the largest reservoir of potable water.
8. World Water Day is celebrated on ______.
a) 21 March
b) 22 March
c) 21 June
d) None of the above
Answer: b
9. Water vapour is ______ phase of water.
a) Solid
b) Liquid
c) Gaseous
d) None of the above
Answer: c
10. Which of the following indicates the presence of groundwater in the soil?
a) Moisture
b) Wetness
c) Both (a) and (b)
d) None of the above
Answer: c
11. Which of the following is the conventional method of collecting water?
a) Bawri
b) Bari
c) Babri
d) None of the above
Answer: a
12. Chlorination of water makes the water ______.
a) Dirty
b) Chlorinated
c) Germ-free
d) None of the above
Answer: c
Explanation: We add chlorine to drinking water to kill bacteria, viruses and parasites. The pernicious effect of chlorine relies on the water pH, chlorine level, contact time and temperature.
13. How much water is present in the human body?
a) 65%
b) 75%
c) 95%
d) None of the above
Answer: b
Explanation: Our body contains 75% water. However, it may vary from person to person based on multiple factors.
14. Which of the following indicates the solid state of the water?
a) Rain
b) Snow
c) Water vapour
d) All of the above
Answer: b
15. The process of seeping water into the ground is known as ______.
a) Filtration
b) Infiltration
c) Both (a) and (b)
d) None of the above
Answer: b
Explanation: Infiltration occurs when surface water passes through the soil. It is an essential process that recharges the groundwater. If groundwater is not replenished sufficiently, it will lead to water table depletion.
16. Which of the following is not responsible for water scarcity?
a) Increasing population
b) Heavy rainfall
c) Deforestation
d) All of the above
Answer: b
17. How much water is present on the earth’s surface?
a) 63%
b) 71%
c) 97%
d) None of the above
Answer: b
18. Which of the following causes water pollution?
a) Disposal of untreated sewage into water bodies
b) Disposal of untreated industrial waste into water bodies
c) Excessive use of pesticides and fertilisers
d) All of the above
Answer: d
Explanation: Water pollution is caused by disposing of untreated sewage or industrial waste into water bodies as it introduces harmful microorganisms and chemicals into the water bodies, contaminating the water and killing the living organisms in it. Moreover, when farmers use excessive fertilisers in the fields, these are washed off and carried into the water bodies, polluting them.
19. The process of recharging groundwater by collecting rainwater is known as _______.
a) Drip irrigation
b) Water harvesting
c) Both (a) and (b)
d) None of the above
Answer: b
20. The upper layer of the earth’s surface where water is found is known as ______.
a) Water top
b) Water table
c) Aqua top
d) None of the above
Answer: b
Explanation: Groundwater is the most critical reservoir of freshwater. The upper level of groundwater is known as the water table.
Read Also:
- Importance of Water (H2O)
- Properties of Water: Physical And Chemical
- Chemical Formula for Water
- The Importance of Water
- Hard Water and Soft Water
- Water Questions
- Uses of Water
- Difference between Hard Water and Soft Water
- Properties of Water: Physical and Chemical
- Chemistry Concept Questions and Answers
- Chemistry Worksheets Class 7 on Chapter 16 Water a Precious Resource with Answers – Set 1
- Chemistry Worksheets Class 7 on Chapter 16 Water a Precious Resource with Answers – Set 2
- Chemistry Worksheets Class 7 on Chapter 16 Water a Precious Resource with Answers – Set 3
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