Homework Practice

Printable assignment

Wastewater Story: Practice 002

Build Understanding

Question 1mcq

Which step usually comes first in wastewater treatment?

A.Chlorination before any removal

B.Discharging raw sewage into rivers

C.Screening to remove large solids

D.Adding mirrors to tanks

Question 2mcq

What is the purpose of sedimentation in wastewater treatment?

A.To split white light into colours

B.To make all germs larger

C.To turn sludge into glass.

D.To let heavier solids settle down

Question 3mcq

Why is aeration used in treatment plants?

A.To help aerobic microbes break down organic matter

B.To remove all water from sewage instantly

C.To make sewage more poisonous

D.To stop microbes from working.

Question 4mcq

Which sequence is most reasonable for wastewater treatment?

A.Disinfection

ightarrow

dumping

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screening

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ignoring

B.Screening

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sedimentation

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aeration

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disinfection

C.Aeration

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mirror reflection

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pollination

D.Sludge removal

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adding plastic

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release raw sewage

Question 5mcq

A treatment tank has bubbles continuously rising through wastewater. What process is likely happening?

A.Pollination

B.Reflection

C.Aeration

D.Groundwater recharge only

Apply and Explain

Question 6mcq

What is sludge in wastewater treatment?

A.Pure drinking water

B.A type of lens

C.Clean rain cloud

D.Settled solid matter from sewage

Question 7mcq

How can treated sludge be useful?

A.It can be used to produce biogas or manure after proper treatment.

B.It should always be dumped into rivers untreated.

C.It becomes a convex mirror.

D.It stops all microbial action.

Question 8mcq

Which gas mixture is produced during anaerobic digestion of sludge?

A.Pure oxygen only

B.Biogas

C.Nitrogen-free air

D.Steam only

Question 9mcq

Why should raw sludge not be handled casually?

A.It is always cleaner than drinking water.

B.It has no smell or germs ever.

C.It may contain harmful microbes and pollutants.

D.It is a type of edible food.

Question 10mcq

A plant uses enclosed tanks to break down sludge without oxygen. What is the likely benefit?

A.Rainbow formation

B.Image magnification

C.Seed dispersal

D.Biogas production