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Water: A Precious Resource

Description: Water: A Precious Resource
Number of Questions: 15
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Tags: Science Class 7 Difference Between Clinical Thermometer and Laboratory Thermometer Meaning of Temperature How does an Umbrella Help us When We Go Out in Sun Role of Medium in Radiation Differenece Between Good Conductors and Poor Conductors Water: A Precious Resource Sources of Water Forms of Water Water Table and Depletion of Water Table Water Management
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Which of the following is not a source of fresh water?

  1. Rivers

  2. Lakes

  3. Streams

  4. Ponds

  5. Oceans

Show answer
Correct Option: E
Explanation:

This is the correct option. Oceans are not the source of fresh water.

Which of the following is/are the uses of water?

  1. Crop irrigation

  2. Cooking

  3. Drinking

  4. Generation of hydroelectricity

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option as all of the above are the uses of water.

The density of water is similar to that of ________________.

  1. symplast

  2. cell protoplasm

  3. vacuole

  4. apoplast

  5. cytosol

Show answer
Correct Option: B
Explanation:

This is the correct option. The density of water is similar to that of cell protoplasm.

Which day is celebrated as Worlds Water Day?

  1. March 23

  2. April 7

  3. March 15

  4. March 22

  5. April 18

Show answer
Correct Option: D
Explanation:

This is the correct option. March 22 is celebrated as World Water Day.

Which of the following statements is/are false?

a. Only 2.6% of the total water resources of the world consists of fresh water. b. Water plays a vital role in the in the metabolic reactions taking place in our body. c. Due to its properties, water is not a universal solvent.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only c

  5. Only b and c

Show answer
Correct Option: D
Explanation:

Due to its properties, water is not a universal solvent, is a wrong statement. Water is a universal solvent and thus it provides a medium for chemical reactions. Thus  this is the correct option.

Which of the following sources hot water has highly saline and contains about 3.5% soluble salts?

  1. River

  2. Ocean

  3. Spring

  4. Lake

  5. Pond

Show answer
Correct Option: B
Explanation:

This is the correct option. Ocean water is highly saline and contains about 3.5% soluble salts.

Which of the following statements is/are false? a. Water is known as the elixir of life. b. Spring water contains dissolved minerals from the surrounding rocks. c. Plenty of surface water is available in nature in wells and springs.

  1. Only a

  2. Only a and b

  3. Only c

  4. Only b and c

  5. Only b

Show answer
Correct Option: C
Explanation:

This is the correct option. Plenty of surface water is available in nature in wells and springs, is a false statement. Plenty of surface water is available in nature in lakes, rivers and streams.

Which of the following factor is not responsible for depletion of water table?

  1. Deforestation

  2. Increase in agriculture needs

  3. Excessive usage due to increase in population

  4. Increase in industrial activities

  5. Excessive rainfall

Show answer
Correct Option: E
Explanation:

Excessive rainfall is not responsible for depletion of water table. This is the correct option.

Match the forms of water with their sources:

 
1. Solid a. Water vapour in atmosphere
2. Liquid b. Snow covered mountains
3. Gaseous c. Oceans

  1. 1 - b, 2 - c, 3 - a

  2. 1 - b, 2 - a, 3 - c

  3. 1 - c, 2 - b, 3 - a

  4. 1 - c, 2 - a, 3 - b

  5. 1 - a, 2 - c, 3 - b

Show answer
Correct Option: A
Explanation:

This is the correct option. Water is available in solid form on snow covered mountains. Water is available in liquid forms in oceans. Water is available in gaseous form in the form of water vapour in the atmosphere.

Which of the following is/are steps necessary for the conservation of water?

  1. Controlling floods by interlinking the rivers.

  2. Constructing reservoirs and dams.

  3. Using sprinklers for irrigation.

  4. Treatment of domestic and municipal waste water.

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option, as all of the above given steps are necessary for the conservation of water.

Of the total water available, __________ is fit for human consumption.

  1. 70%

  2. 0.006%

  3. 97.4%

  4. 3.5%

  5. 5%

Show answer
Correct Option: B
Explanation:

This is the correct option. Of the total water available, 0.006% is fit for human consumption.

Which of the following is not a step to conserve water in our houses?

  1. Avoiding cleaning utensils with a running tap

  2. Using smaller cisterns in toilets

  3. Using running shower for bathing

  4. Repairing leaking pipelines

  5. Avoiding overflowing taps

Show answer
Correct Option: C
Explanation:

This is the correct option, as using running shower for bathing will result in more wastage of water and it will not help in the conservation of water.

Match the following:

 
1. Ground water a. The type of water that has collected on the ground level and can be collected by precipitation.
2. Water table b. Water found underground in the cracks and spaces in soil, sand and rock.
3. Surface water c. The highest underground level at which the rocks and soil in a particular area are completely wet with water.

  1. 1 - b, 2 - a, 3 - c

  2. 1 - b, 2 - c, 3 - a

  3. 1 - c, 2 - b, 3 - a

  4. 1 - c, 2 - a, 3 - b

  5. 1 - a, 2 - c, 3 - b

Show answer
Correct Option: B
Explanation:

This is the correct option. Ground water is the water found underground in the cracks and spaces in soil, sand and rock. Water table is the highest underground level at which the rocks and soil in a particular area are completely wet with water. Surface water is the type of water that has collected on the ground level and can be collected by precipitation.

Which of the following statements is/are false? a. Rainwater harvesting is a solution to the problem of depleting groundwater. b. To obtain water from great depths, farmers have to deepen their tube wells every year. c. Water is more easily available in arid regions as compared to other regions.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only a and c

  5. Only c

Show answer
Correct Option: D
Explanation:

To obtain water from great depths, farmers have to deepen their tube wells every year is a correct statement. But, water is more easily available in arid regions as compared to other regions, is a false statement. Water is more easily available in arid regions as compared to other regions, is a false statement. Water is scarce in these areas and people have to spend a lot of time and energy to obtain it in these areas.

Match the following:

 
1. Precipitation a. The process by which water collects as droplets on a cold surface when humid air is in contact with it.
2. Condensation b. The process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and pressure.
3. Transpiration c. Any kind of water that is falling to the Earth from the clouds.

  1. 1 - a, 2 - c, 3 - b

  2. 1 - c, 2 - b, 3 - a

  3. 1 - c, 2 - a, 3 - b

  4. 1 - a, 2 - b, 3 - c

  5. 1 - b, 2 - a, 3 - c

Show answer
Correct Option: C
Explanation:

This is the correct option. Precipitation is any kind of water that is falling to the Earth from the clouds. Condensation is the process by which water collects as droplets on a cold surface when humid air is in contact with it. Transpiration is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and pressure.

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