MCQ Questions for Class 7 Chemistry Water A Precious Resource Quiz 5

Which one of the following is not responsible for water shortage?

0%
Rapid growth of industries.
0%
Increasing population.
0%
Heavy rainfall.
0%
Mismanagement of water resources.

The water fit for drinking is called

0%
Portable water
0%
Portrayable water
0%
Potable water
0%
None of these.

Explanation

Water fir for drinking is known as potable water. If something is potable that means it's safe to drink. The word comes from the Latin,

$potare$ , meaning "to drink".

Oceans and seas cover ______ of the earth

0%
Half
0%
One third
0%
Two third
0%
Three fourth

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

0%
200 litres
0%
150 litres
0%
100 millilitres
0%
50 litres

Mark True if the statement is true and False if it is false:
Rain is the ultimate source of water.

0%
True
0%
False

What is the water cycle?

0%
The process of water passing out from the surface of leaves of a plant.
0%
Water falling from clouds in the form of rain, freezing rain, sleet, snow, or hail.
0%
Movement of water from the atmosphere to the earth and then back to atmosphere.
0%
None of the above

The water is supplied through a network of pipes. Are these types of water supply systems present in all parts of the country?

0%
Yes
0%
No
0%
Both (A) and (B)
0%
None of the Above

Liquid water is present in oceans, lakes, rivers, and even underground.

0%
True
0%
False

Explanation

$\text{True}$

Water in liquid form is present in oceans, lakes, rivers, and also underground. It is present as snow in solid form, and as a vapor or gas in the atmosphere.

Which of the following is the purest form of natural water?

0%
River water
0%
Filtered water
0%
Rain water
0%
Mineral water

Explanation

Rainwater is considered to be the purest form of natural water as it directly comes from the condensation of water droplets. During vaporization by the sun, the water evaporates from oceans, seas, rivers leaving behind all the impurities and salts and form the cloud.

So, option

$C$ is correct.

Observe the above water cycle. The water cycle differs from other cycles in that it occurs primarily due to physical processes, not chemical processes. Observe the figure and the following statements and put the events in the correct sequence.

A. Precipitation exceeds evaporation and transpiration over land, runoff, and groundwater balance the net flow of water vapor to land.

B. Solar energy results in evaporation from the oceans
C. Over the oceans, evaporation exceeds precipitation, the excess water vapor is moved onto land by winds.
D. Water vapor rises, cools, and falls as precipitation.

0%
$A > B > C > D$
0%
$B > D > A > C$
0%
$C > D > A > B$
0%
$D > B > A > C$

Explanation

$\textbf{Correct answer: B}$

$\textbf{Option (B):}$

$\bullet$ At first the solar energy results in evaporation from the ocean. Evaporation of water from the sea occurs in the form of water vapour.

$\bullet$ As the water vapour rises up in the air it cools down and falls as precipitation. This is because colder air is denser than warmer air.

$\bullet$ Precipitation exceeds the evaporation and transpiration over land.

$\bullet$ Few of the water coming from precipitation moves back to the ocean in the form of runoff.

$\bullet$ Some of the water percolates into groundwater, balancing the net flow of water vapour into the land ecosystem.

$\bullet$ In the ocean, evaporation is higher than precipitation. This excess water vapour needs to be moved to the land region by the wind.

Therefore the given sequence will be $\textbf{B>D>A>C }$ .

Hence, the correct answer is option (B).

CBSE Questions for Class 7 Chemistry Water A Precious Resource Quiz 5 - MCQExams.com

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Practice Class 7 Chemistry Quiz Questions and Answers

CBSE Questions for Class 7 Chemistry Water A Precious Resource Quiz 5 - MCQExams.com

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Practice Class 7 Chemistry Quiz Questions and Answers

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