WASTEWATER STORY Class 7

Which is the quality of water waste?

• Dirty look

• Foul smell

• Mixed with lather

• All of these

Which of the following is/are products of wastewater treatment?

• Biogas

• Sludge

• Both biogas and sludge

• Aerator

Tags

NGSS.MS-LS2-3

Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?

• Cholera

• Typhoid

• Asthma

• Dysentery

Sewage treatment

• is a process of waste water treatment.

• refers to waste water that is released by homes, industries, hospitals etc.

• refers to the rain water that run down the streets during heavy rains.

• All of the above

Tags

NGSS.MS-ESS3-3

In the treatment of waste water, following steps are involved. (i) aeration (ii) removal of large objects (iii) chlorination The correct order of these steps is

• (i),(iii),(ii)

• (iii), (ii), (i)

• (i), (ii), (iii)

• (ii), (i), (iii)

We should not throw cooking oil and paint down the drain because

• they break the pipe

• they harden and clog the pipe

• they flow through the drain freely

• None of these

Tags

NGSS.MS-ESS3-3

Which of the following is a good practice be followed?

• Cooking oil and paint should not be thrown down a drain.

• Used tea leaves, solid food and cotton should not be thrown in the drain.

• Chemicals like insecticides should not throw in the drain.

• All of the above

Tags

NGSS.MS-ESS3-3

Which process during waste water treatment helps in eliminating germs?

• Aeration

• Sedimentation

• Chlorination

• None of the above

Dried _____ is used as manure

• slury

• sewage

• sand

• sludge

Tags

NGSS.MS-LS2-3

In vermi-processing toilet the human excreta is treated by

• Redworm

• Tapeworm

• Earthworm

• Roundworm