NCERT Class VII Science Solutions: Chapter 16-Water: A Precious Resource Part 2

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Question 7:

The amount of water recommended by the United Nations for drinking, washing, cooking and maintaining proper hygiene per person per day is a minimum of

  1. 5 litres

  2. 15 litres

  3. 30 litres

  4. 50 litres

Answer: D

Question 8:

“Every Drop Counts” is a slogan related to

  1. Counting of drops of any liquid.

  2. Counting of water drops.

  3. Importance of water.

  4. Importance of counting.

Answer: C

Question 9:

Water cycle does not involve which of the following?

  1. Evaporation

  2. Condensation

  3. Formation of clouds

  4. Rainwater harvesting

Answer: D

Image of water cycle

Water Cycle

Image of water cycle

Question 10:

Which of the following inhibits the seepage of rainwater into ground?

  1. A pukka floor

  2. Playground

  3. Grass lawn

  4. Forest land

Answer: A

VERY SHORT ANSWER QUESTIONS

Question 11:

State whether the following statements are true or false. If false, write the correct statement.

  1. Water vapour is the gaseous form of water.

  2. Ice is solid whereas snow is the semi-solid form of water.

  3. Ocean water cannot be used for domestic purposes.

  4. Rapid growth of industries is one of the causes for water shortage.

Answer:

  1. Water vapour is the gaseous form of water. (True)

  2. Ice is solid whereas snow is the semi-solid form of water. (True)

  3. Ocean water cannot be used for domestic purposes. (False)

    Hint: Snow is also a solid form of water.

  4. Rapid growth of industries is one of the causes for water shortage. (True)

Question 12:

Some definitions are given below which can be corrected by changing one word. Correct them.

  1. Aquifer is ground water stored between layers of hard rock above the water table.

  2. The process of evaporation of water in the ground is called infiltration.

  3. The evaporation of water from oceans and its arrival back into oceans is called vapour cycle.

Answer:

  1. Change “above” with “below”.

  2. Change “evaporation” with “seeping”.

  3. Change “vapour” with “water”.