Wastewater Story [CBSE (Central Board of Secondary Education) Class-7 Science]: Questions 13 - 19 of 23

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Question 13

Question MCQ▾

Some methods to conserve the water are:

Choices

Choice (4)Response

a.

Mop the floors instead of washing them

b.

Avoid wastage of water

c.

Adopt rain harvesting technique

d.

All a., b. and c. are correct

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Question 14

Question MCQ▾

Organic matter settled down at the base of sedimentation tank is called as:

Choices

Choice (4)Response

a.

Slush

b.

Sludge

c.

Contaminant

d.

Both a. and b. are correct

Edit

Question 15

Question MCQ▾

Scarcity of clean potable water is due to:

Choices

Choice (4)Response

a.

Industrial development

b.

Population growth

c.

Pollution

d.

All a., b. and c. are correct

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Question 16

Question MCQ▾

Different types of impurities present in water are:

Choices

Choice (4)Response

a.

Inorganic impurities

b.

Organic impurities

c.

Nutrients, Bacteria

d.

All a., b. and c. are correct

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Question 17

Question MCQ▾

Onsite arrangements for sewage disposal are:

Choices

Choice (4)Response

a.

Composting pits

b.

Chemical toilets

c.

Septic tanks

d.

All a., b. and c. are correct

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Question 18

Question MCQ▾

Water is polluted from various sources such as from:

Choices

Choice (4)Response

a.

Mining operations and construction work

b.

Houses, Industries

c.

Farms

d.

All a., b. and c. are correct

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Question 19

Question MCQ▾

Underground network of inter-connected pipes is called as:

Choices

Choice (4)Response

a.

Sewer

b.

Sewage

c.

Sewerage

d.

Question does not provide sufficient data or is vague

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