NCERT Solutions for Class 7 Social Science Geography Chapter 5 Water

Water Class 7 Questions and Answers Geography Chapter 5

Class 7 Geography Chapter 5 NCERT Textbook Questions and Answers

Question 1.
Answer the following questions :
(i) What is precipitation?
Answer:
The condensation of water vapour in the form of water droplets or ice crystals and their falling on the earth surface is known as precipitation.

(ii) What is water cycle?
Answer:
The water’s never ending movement from sea to air, air to land and back to the sea is known as water cycle. It is also called hydrological cycle.

(iii) What are the factors affecting the height of the waves?
Answer:
Following factors effects the height of the waves
(a) Winds
(b) Weather conditions
When the winds blowing at very high speed, it form a huge wave.

(iv) Which factors affect the movement of ocean water?
Answer:
Following factors affect the movement of ocean water :
(a) Waves
(b) Tides
(c) Currents
An earthquake, volcanic eruption or under water landslides can shift the large amount of water.

(v) What are tides and how are they caused?
Answer:
The regular rise and fall in sea water is called tides.

Tides are caused by mainly the attractive forces of the moon and to some extent by the sun. The sun by virtue of its bigger size should attract more but owing to the greater distance from the earth it is unable to exert much influence. Moon exerts more influence on the earth for tide occurrence. Since water is free to move, a tidal bulge is produced in the direction of the moon.

(vi) What are ocean currents?
Answer:
Motion of sea water is the result of the winds. Winds blow across the surface of the sea or ocean, create current. When sea water moves continuously in a particular direction a current is formed. These are of two types-cold and hot currents. They effect the coastal region.

Question 2.
Give reasons :
(i) Ocean water is salty.
Answer:
Ocean water is salty because it contains large amount of dissolved salts.

(ii) The quality of water is deteriorating.
Answer:
The quality of water is deteriorating because water is being polluted by different means.

Question 3.
Tick the correct answer :
(i) The process by which water continually changes its form and circulates :
(a) Water cycle
(b) Tides
(c) Ocean currents
Answer:
(a) Water cycle

(ii) Generally the warm ocean currents originate near :
(a) Poles
(b) Equator
(c) None of these
Answer:
(b) Equator

(iii) The rythmic rise and fall of ocean water twice in a day is called :
(a) Tide
(b) Ocean current
(c) Wave
Answer:
(a) Tide

Question 4.
Match the following-

(i) Caspian sea (a) Largest lake
(ii) Tide (b) Periodic rise and fall of water
(iii) Tsunami (c) Strong seismic waves
(iv) Ocean currents (d) Streams of water moving indefinite paths.

Answer:

(i) Caspian sea (a) Largest lake
(ii) Tide (b) Periodic rise and fall of water
(iii) Tsunami (c) Strong seismic waves
(iv) Ocean currents (d) Streams of water moving indefinite paths.

Question 5.
Be a Detective
(i) The name of one river is hidden in each of the sentences below. Spot it. Example: Mandira, Vijayalakshmi, and Surinder are my best friends
Answer.
Ravi

  1. The snake charmer’s bustee, stables where horses are housed, and the piles of wood, all caught fire accidentally. (Hint: Another name for River Brahmaputra)
  2. The conference manager put pad, material for reading, and a pencil for each participant. (Hint: A distributary on the Ganga-Brahmputra delta)
  3. Either jealousy or anger cause a person’s fall (Hint: Name of juicy fruit!)
  4. Bhavani germinated the seeds in a pot (Hint: Look for her in West Africa)
  5. “I am a zonal champion now” declared the excited athlete. (Hint: The river that has the biggest basin in the world)
  6. The tiffin box rolled down and all the food fell in dusty potholes. (Hint: Rises in India and journeys through Pakistan)
  7. Malini leaned against the pole when she felt that she was going to faint. (Hint: Her delta in Egypt is famous)
  8. Samantha mesmerised everybody with her magic tricks. (Hint: London is situated on her estuary)
  9. “In this neighbourhood, please don’t yell! Owners of these houses like to have peace.” Warned my father when we moved into our new flat.” (Hint: color!)
  10. ‘Write the following words, Marc!’ “On”, “go”, “in”— said the teacher, to the little boy in KG Class. (Hint: Rhymes with ‘bongo’)

Now make some more on your own and ask your classmates to spot the hidden name.-You can do this with any name: that of a lake, mountains, trees, fruits, school items, etc.
Answer:

  1. Teesta (a tributary of Brahmaputra)
  2. Padma
  3. Orange
  4. Niger
  5. Amazon
  6. Indus
  7. the Nile
  8. the Thames
  9. Yellow river
  10. Congo

Do further exercise yourself.

Carry on Detective

(ii) With the help of an atlas, draw each river which you discovered in For fun (/), on an outline map of the world.
Answer:

NCERT Solutions for Class 7 Social Science Geography Chapter 5 Water 2

NCERT Solutions for Class 7 Social Science

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