Wastewater Story (CBSE Class-7 Science): Questions 8 - 14 of 23

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Question number: 8

» Wastewater Story » Sanitation and Disease » Vermi-Processing Toilets

MCQ▾

Question

What is a vermicomposting toilet?

Choices

Choice (4) Response

a.

Toilets in aeroplane and trains

b.

Toilets in which excreta is treated by earthworms

c.

Toilets which use chemicals to disinfect human waste

d.

None of the above

Question number: 9

» Wastewater Story » Better House Keeping Practices » Various Ways to Prevent Water Pollution

MCQ▾

Question

Why cooking oil and fats should not be thrown down the drain?

Choices

Choice (4) Response

a.

Because they clog the soil

b.

Because they harden and block the pipes

c.

Decrease the effectiveness of soil in filtering the water

d.

All a. , b. and c. are correct

Question number: 10

» Wastewater Story » Waste Water Treatment Plant » Water Clarifier

MCQ▾

Question

Primary water clarifier is:

Choices

Choice (4) Response

a.

Sedimentation tanks

b.

Bar Screen

c.

Grit chambers

d.

All of the above

Question number: 11

» Wastewater Story » Water, Our Lifeline » Waste Water

MCQ▾

Question

Water flowing down the drain is called as:

Choices

Choice (4) Response

a.

Waste water

b.

Sewage

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

Question number: 12

» Wastewater Story » Waste Water Treatment Plant » Aerator Tank

MCQ▾

Question

Pumping of air in clarified water is called as the:

Choices

Choice (4) Response

a.

Biogas

b.

Aeration

c.

Aerobic bacteria

d.

Question does not provide sufficient data or is vague

Question number: 13

» Wastewater Story » Better House Keeping Practices » Conservation of Water

MCQ▾

Question

Some methods to conserve the water are:

Choices

Choice (4) Response

a.

Mop the floors instead of washing them

b.

Adopt rain harvesting technique

c.

Avoid wastage of water

d.

All a. , b. and c. are correct

Question number: 14

» Wastewater Story » Waste Water Treatment Plant » Sludge

MCQ▾

Question

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

Choices

Choice (4) Response

a.

Slush

b.

Contaminant

c.

Sludge

d.

Both a. and c. are correct

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