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Important Questions Test: Waste Water Story


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20 Questions MCQ Test General Science(Prelims) by IRS Divey Sethi | Important Questions Test: Waste Water Story

Important Questions Test: Waste Water Story for Class 7 2022 is part of General Science(Prelims) by IRS Divey Sethi preparation. The Important Questions Test: Waste Water Story questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Waste Water Story MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Waste Water Story below.
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Important Questions Test: Waste Water Story - Question 1

Out of the following, select those that would help to reduce water pollution.

(i) use of sewers for removal of urban waste
(ii) use of unleaded petrol in cars
(iii) spraying of pesticides on plants
(iv) We should not excreate in open.

Detailed Solution for Important Questions Test: Waste Water Story - Question 1

because using pesticides on plants is no way useful to reduce water pollution and use of unleaded petrol in cars is related to air pollution. 

So, statement (1) and (4) is correct.

Important Questions Test: Waste Water Story - Question 2

Select the one that is incorrect for vermin processing toilet.

Detailed Solution for Important Questions Test: Waste Water Story - Question 2

In it the human excreta is treated with earth worms.

Important Questions Test: Waste Water Story - Question 3

The international decade for action on "water for life" by United Nations General Assembly was declared on

Detailed Solution for Important Questions Test: Waste Water Story - Question 3

It was declared in 22 March, 2005.

Important Questions Test: Waste Water Story - Question 4

Sewage refers to waste water that is released by

Detailed Solution for Important Questions Test: Waste Water Story - Question 4

Sewage is a liquid waste which has water as its largest component along with various types of impurities like waste water from houses, offices, factories, hospitals etc., is called sewage.

Important Questions Test: Waste Water Story - Question 5

Select the disease that is not caused by improper disposal of sewage.

Detailed Solution for Important Questions Test: Waste Water Story - Question 5

A heart attack occurs when an artery supplying your heart with blood and oxygen becomes blocked.

Important Questions Test: Waste Water Story - Question 6

In a waste water treatment plant, after passing the waste water through a grit and sand removal tank, the water is allowed to settle in a large tank. The solids that settle at the bottom of large tank and called

Detailed Solution for Important Questions Test: Waste Water Story - Question 6

Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment.

Important Questions Test: Waste Water Story - Question 7

Which plant is suggested for purification of sewage pond water?

Detailed Solution for Important Questions Test: Waste Water Story - Question 7

The researchers argue that trees with high transpiration rate ('thirsty' trees) such as eucalyptus can be easily used to clean the environment of wastewater.

Important Questions Test: Waste Water Story - Question 8

Which of the following group is against the plantation of Eucalyptus trees?

Detailed Solution for Important Questions Test: Waste Water Story - Question 8

Eucalyptus is an efficient biomass producer, it can produce more biomass than many other tree species. Growing Eucalyptus in low rainfall areas may cause adverse environmental impacts due to competition for water with other species.

Important Questions Test: Waste Water Story - Question 9

Sewage treatment

Detailed Solution for Important Questions Test: Waste Water Story - Question 9

Sewage treatment is the process of removing contaminants from municipal wastewater, containing mainly household sewage plus some industrial wastewater.

Important Questions Test: Waste Water Story - Question 10

The impurities present in sewage may consist of

Detailed Solution for Important Questions Test: Waste Water Story - Question 10

The impurities present in sewage water may consists of organic or inorganic substances or nutrients.

Important Questions Test: Waste Water Story - Question 11

Select those which are organic substances present in waste water.

Detailed Solution for Important Questions Test: Waste Water Story - Question 11

Pesticides,vegetables,fruits, herbicides are all organic substances present in the wastewater. 

Important Questions Test: Waste Water Story - Question 12

Treatment plants

Detailed Solution for Important Questions Test: Waste Water Story - Question 12

reduce pollutants in waste water to a level where nature can take care of it.

Important Questions Test: Waste Water Story - Question 13

The sludge waste originates from

Detailed Solution for Important Questions Test: Waste Water Story - Question 13

Waste that originates from kitchen is known as sludge.

Important Questions Test: Waste Water Story - Question 14

In the treatment of waste water, following steps are involved.

(i) aeration 
(ii) nitration
(iii) chlorination

The correct order of these steps is

Detailed Solution for Important Questions Test: Waste Water Story - Question 14

Aeration brings water and air in close contact in order to remove dissolved gases.The nitration process is a general class of chemical process for the introduction of a nitro group into an organic chemical compound.chlorination is used to prevent the spread of waterborne diseases.

Important Questions Test: Waste Water Story - Question 15

When waste water is passed through bar screens in WWTP, it removes

Detailed Solution for Important Questions Test: Waste Water Story - Question 15

When waste water is passed through bar screens in WWTP it removes plastic packets.

Important Questions Test: Waste Water Story - Question 16

Which of the following are removed by use of A skimmer in WWTP?

Detailed Solution for Important Questions Test: Waste Water Story - Question 16

A skimming tank is a chamber so arranged that the floating matter like oil, fat, grease etc., rise and remain on the surface of the waste water.

Important Questions Test: Waste Water Story - Question 17

The percentage of water in activated sludge is about

Detailed Solution for Important Questions Test: Waste Water Story - Question 17

The composition of this sludge depends on the characteristics of the catchment area. Primary sludge consists to a high portion of organic matters, as faeces, vegetables, fruits, textiles, paper ect. The consistence is a thick fluid with a water percentage between 93 % and 97 %.

Important Questions Test: Waste Water Story - Question 18

What are the products of waste water treatment system?

Detailed Solution for Important Questions Test: Waste Water Story - Question 18

By-products from wastewater treatment plants, such as screenings, grit and sewage sludge may also be treated in a wastewater treatment plant.

Important Questions Test: Waste Water Story - Question 19

Liquid waste consisting of suspended impurities is called _____.

Detailed Solution for Important Questions Test: Waste Water Story - Question 19

Sewage is a liquid waste which has water as its largest component along with various types of impurities like waste water from houses, offices, factories, hospitals etc., is called sewage.

Important Questions Test: Waste Water Story - Question 20

What is the full form of WWTP?

Detailed Solution for Important Questions Test: Waste Water Story - Question 20

Waste water treatment plant

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