Water | Geography VII | Class 7th | Questions and Answers

 

JANDKNCERT | Social Science | Our Environment

Water | Geography VII | Class 7th | Questions and Answers

 

Chapter 5: Water

1. Answer the following questions

Question (i): What is precipitation?
Answer: Precipitation is the process by which water falls from the atmosphere to the Earth's surface in the form of rain, snow, sleet, or hail.

Question (ii): What is the water cycle?
Answer: The water cycle is the continuous movement of water between the Earth's surface and the atmosphere through processes like evaporation, condensation, and precipitation.

Question (iii): What are the factors affecting the height of the waves?
Answer:
(i) Speed of the wind
(ii) Duration of the wind
(iii) Distance the wind travels over the water (fetch)

Question (iv): Which factors affect the movement of ocean water?
Answer:
(i) Waves
(ii) Tides
(iii) Ocean currents

Question (v): What are tides and how are they caused?
Answer: Tides are the rise and fall of ocean water levels. They are caused by the gravitational pull of the Moon and the Sun on the Earth’s surface.

Question (vi): What are ocean currents?
Answer: Ocean currents are the continuous, predictable movements of ocean water in specific directions. They may be warm or cold and are caused by wind, Earth's rotation, temperature, and salinity differences.

2. Tick the correct answer

Question (i): The process by which water continually changes its form and circulates between oceans, atmosphere and land
Answer: (c) Water cycle

Question (ii): The process of changing of water into its vapour is called
Answer: (b) Evaporation

Question (iii): The process of changing water vapour into water is called
Answer: (c) Condensation

Question (iv): No tides are caused by the
Answer: (b) Sun (Note: The sun does cause tides, but they are weaker than lunar tides. The correct NCERT answer here is often interpreted as (a) Earth.)

Question (v): High tides help in
Answer: (c) Navigation

3. Match the following

Question	Answer
(i) Caspian Sea	(c) Largest lake
(ii) Tide	(e) Rise and fall of water
(iii) Ocean Currents	(a) Streams of water moving along definite paths
(iv) Tsunami	(d) Strong seismic wave
(v) Ice	(b) Solid form of water

4. Give reasons

Question (i): Ocean water is salty.
Answer: Ocean water is salty because it contains large amounts of dissolved salts, mainly from the minerals washed into the sea by rivers and undersea volcanic activity.

Question (ii): The quality of water is deteriorating.
Answer: The quality of water is deteriorating due to pollution from industrial waste, chemicals, sewage, and plastic, which contaminate both surface and groundwater.