NCERT Solutions class 7 Geography Chapter 5. Water NCERT Exercise

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Q1. Answer the following questions.
(i) What is precipitation?
(ii) What is water cycle?
(iii) What are the factors affecting the height of the waves?
(iv) Which factors affect the movement of ocean water?
(v) What are tides and how are they caused?
(vi) What are ocean currents?

Answer:

(i) Precipitation is the deposition of moisture from the atmosphere onto the earth's surface. This may be in the form of rain, hail, frost, fog, sleet, or snow.            (ii) The process by which water continually changes its form and circulators between oceans, atmosphere and land is known as the water cycle.              (iii) (a) High speed winds, (b) earth quake, (c) volcanic eruption and (d) under water landslides.                                                                  (iv) (a) Tempreature and (b) rotation of the earth.                                  (v) The rhythmic rise and fall of ocean water twice a day is called a tide. Tides are caused due to the gravitational pull exerted by the sun and the moon on the earth's surface.                                                                    (vi) Ocean currents are streams of water flowing constantly on the ocean surface in definite directions.             

Q2. Tick the correct answer.
(i) The process by which water continually changes its form and circulates
between oceans, atmosphere and land
(a) Water cycle (b) Tides (c) Ocean currents
(ii) Generally the warm ocean currents originate near
(a) Poles (b) Equator (c) None of these
(iii) The rythmic rise and fall of ocean water twice in a day is called
(a) Tide (b) Ocean current (c) Wave

Answer:

(i)-(a) (ii)-(b) (iii)-(a)
Q3. 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 along definite paths
(e) Water cycle

Answer:

Q4. Give reason:                                                                (i) Ocean water is salty.                                                          (ii) The quality of water is deterioting.

Answer:             

(i) Because it contains large amount of dissolved salts.                            (ii) (a) Garbage we throw in river.                                                  (b) Chemical from industries and poluted water.                                    (c) Remains of the harmful insecticidies and pest resistants flowing in from the fields.                                                                            (d) Unburnt or half burnt corpose of men and animal thrown in water bodies.