Natural Resources & Their Conservation Test

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Natural Resources & Their Conservation Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Observe the following statements about the availability of water on the earth and identify the correct option regarding their accuracy.

I. Nearly 97% of the earth's surface is covered with water.
II. Almost 71% of the available water on earth is saline.
III. All living beings require water for their sustenance.
IV. All the terrestrial and many of the aquatic life forms cannot survive on water from the seas and oceans.

A
× - I, × - II, ✓ - III, ✓ - IV

B
✓ - I, × - II, × - III, ✓ - IV

C
× - I, ✓ - II, × - III, × - IV

D
✓ - I, × - II, ✓ - III, ✓ - IV

Solution

Nearly 70% of the earth's surface is covered with water. Hence, statement I is incorrect.
Almost 97% of the available water on earth is saline. Hence, statement II is incorrect.

Statements III and IV are correct.
Question 2
1 / -0

Read the following passage and select the correct option to fill up the blank spaces.

The __(i)__ of water from surface of the earth to the __(ii)__ and then back to the earth is called the water cycle. As a result of the water cycle, water content of the __(ii)__ is maintained at a constant level. Water vapour is formed as a result of __(iii)__ from the oceans, lakes and seas, __(iv)__ from plants, respiration and combustion of fuels. The water vapour rises up in the atmosphere and comes in contact with cold air. On cooling, it __(v)__ to form tiny droplets of water, which together form clouds.

A
evaporation - (i), condenses - (ii), transpiration - (iii), evaporation - (iv), atmosphere - (v)

B
circulation - (i), atmosphere - (ii), evaporation - (iii), transpiration - (iv), condenses - (v)

C
transpiration - (i), atmosphere - (ii), circulation - (iii), evaporation - (iv), condenses - (v)

D
transpiration - (i), atmosphere - (ii), evaporation - (iii), circulation - (iv), condenses - (v)

Solution

The __(circulation)__ of water from surface of the earth to the __(atmosphere)__ and then back to the earth is called the water cycle. As a result of the water cycle, water content of the __(atmosphere)__ is maintained at a constant level. Water vapour is formed as a result of __(evaporation)__ from the oceans, lakes and seas, __(transpiration)__ from plants, respiration and combustion of fuels. The water vapour rises up in the atmosphere and comes in contact with cold air. On cooling, it __(condenses)__ to form tiny droplets of water, which together form clouds.
Question 3
1 / -0

Analyse the two statements given below and select the correct option.

Statement I: It is easier to install a hand pump in the northern plains, but it takes a heavy drilling machine to install a tube well in the plateaus.
Statement II: Water table is usually higher in the plains but is very low in the plateaus.

A
Both statements I and II are correct and statement II is the correct reason for I.

B
Both statements I and II are correct, but statement II is not the correct reason for I.

C
Statement I is correct, but statement II is incorrect.

D
Both statements I and II are incorrect.

Solution

The water table in plateaus is low and heavy drilling through the hard rock is required to reach it.
The process is relatively easier when done in plains as the level of water is higher.
Hence, both statements I and II are correct and statement II is the correct reason for I.
Question 4
1 / -0

Rainwater and the water from water bodies on Earth`s surface pass through the soil by the process of __X___, which then gets accumulated in the ____Y_____ deep under the ground.

Select the most suitable choices for X and Y.

A
X - infiltration, Y - aquifers

B
X - filtration, Y - wells

C
X - precipitation, Y - rivers

D
X - precipitation, Y - aquifers

Solution

Rainwater and the water from water bodies on Earth`s surface percolates through the soil by the process of infiltration.

The infiltrated water then gets accumulated in the aquifers deep under the ground. There are some layers of impermeable rocks which prevent the water in the aquifer from seeping down further.
Question 5
1 / -0

The roles of scrapers and skimmers in the sedimentation tank, respectively, are

A
to remove the grit and sand, and to remove the sludge

B
to remove the sludge, and to remove the floating waste

C
to remove the floating waste, and to remove the sludge

D
to remove the pathogens, and to remove the suspended impurities

Solution

The sludge that settles at the bottom of the sedimentation tank is removed with the help of scrapers.
The floating impurities are removed with the help of skimmers.
Question 6
1 / -0

Activated sludge contains ____ water.

A
80%

B
60%

C
98%

D
67%

Solution

Clarified water is removed from the tank and the activated sludge that contains 97% to 98% water is left behind.
This is then dried in the sun and used as manure.

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Re-Attempt Weekly Quiz Competition

Natural Resources & Their Conservation Test - 2

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Natural Resources & Their Conservation Test - 2

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Question 1

× - I, × - II, ✓ - III, ✓ - IV

✓ - I, × - II, × - III, ✓ - IV

× - I, ✓ - II, × - III, × - IV

✓ - I, × - II, ✓ - III, ✓ - IV

Solution

Question 2

evaporation - (i), condenses - (ii), transpiration - (iii), evaporation - (iv), atmosphere - (v)

circulation - (i), atmosphere - (ii), evaporation - (iii), transpiration - (iv), condenses - (v)

transpiration - (i), atmosphere - (ii), circulation - (iii), evaporation - (iv), condenses - (v)

transpiration - (i), atmosphere - (ii), evaporation - (iii), circulation - (iv), condenses - (v)

Solution

Question 3

Both statements I and II are correct and statement II is the correct reason for I.

Both statements I and II are correct, but statement II is not the correct reason for I.

Statement I is correct, but statement II is incorrect.

Both statements I and II are incorrect.

Solution

Question 4

X - infiltration, Y - aquifers

X - filtration, Y - wells

X - precipitation, Y - rivers

X - precipitation, Y - aquifers

Solution

Question 5

to remove the grit and sand, and to remove the sludge

to remove the sludge, and to remove the floating waste

to remove the floating waste, and to remove the sludge

to remove the pathogens, and to remove the suspended impurities

Solution

Question 6

80%

60%

98%

67%

Solution

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