MCQExams
0:0:1
CBSE
JEE
NTSE
NEET
Practice
Homework
×
CBSE Questions for Class 7 Biology Wastewater Story Quiz 1 - MCQExams.com
CBSE
Class 7 Biology
Wastewater Story
Quiz 1
The pit that we have to dig for vermicomposting has to be minimum of ___ cm.
Report Question
0%
30
0%
10
0%
40
0%
20
Explanation
The method of preparing compost with the help of redworms is called
vermicomposting
. 30cm deep is needed for this process. Option A is correct.
The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
Report Question
0%
Sewers
0%
Sewerage
0%
Transport system
0%
Treatment plant
Explanation
Sewerage is the system applied in buildings for discharging wastewater to the sewage. It is a network of pipes, known as sewers, connected together.
Thus,
the correct option is (b) sewerage.
Which of the following is waste water?
Report Question
0%
Water trickling from a damaged tap.
0%
Water coming out of a shower.
0%
Water flowing in a river.
0%
Water coming out of a laundry.
Explanation
Discharged water during household activities or in industries is considered to be wastewater.
Thus, the correct option is (d).
What kind of wastes are filled in a compost pit ?
Report Question
0%
Biodegradable
0%
Non-biodegradable
0%
Both A and B
0%
None of the above
Explanation
Biodegradation
is occurring in the piles through the action of microorganisms that consume nutrients and transform the initial waste into a series of organic substances called
compost.
Thus the material used in compost are biodegradable. Option A is correct.
Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?
Report Question
0%
Cholera
0%
Typhoid
0%
Asthma
0%
Dysentry
Explanation
Asthma is a respiratory disorder in which a patient is allergic to allergens present in air like pollen grains or dust.
Cholera, Typhoid, and Dysentry - are bacterial waterborne diseases, caused by polluted water.
Thus, the correct option is (c).
When the water is cleaned where is it returned to?
Report Question
0%
Our taps
0%
The sea
0%
Our wells
0%
The reservior
Explanation
Wastewater after cleaning is returned to the sea. Moreover, Our tap water, water in river and reservior are the sources of clean and safe water storage. Option B is correct.
Which of the following activities require the usage of clean water?
Report Question
0%
Drinking water
0%
Watering garden plants
0%
Washing clothes
0%
All of the above
Explanation
A large number of water born diseases can occur due to lack of drinking clean water.
Other activities such as watering garden plants and washing clothes require water but not necessarily clean water.
Thus, Option A is correct.
Which among the following are ways to conserve water?
Report Question
0%
Turn off the taps while brushing teeth.
0%
Use less/limited water while bathing.
0%
Boil limited cups of water for drinking.
0%
All of the above
Explanation
Some of the ways to conserve or save water are-
1. Turn off the taps while brushing teeth.
2. Use less/limited water while bathing.
3. Boil limited cups of water for drinking.
4. Avoid food wastes as vegetables and cereals we eat require water to grow.
5. Catch rainwaters in monsoon seasons
Therefore Option D is correct.
What are solid wastes commonly called?
Report Question
0%
Drainage
0%
Garbage
0%
Sewage
0%
All of the above
Explanation
The solid wastes are called as Garbage. Option B is correct.
Which among the following is/are farmers friend?
Report Question
0%
Birds
0%
Earthworm
0%
Snail
0%
All of the above
Explanation
Earthworm helps in composting, thus gaining the name as Farmers friend. Option B is correct.
City garbage can be used to produce
Report Question
0%
sewage sludge
0%
useful articles
0%
biogas and maure
0%
All the above.
Explanation
City garbage can be decomposed to form biogas and manure as it contains raw materials that can be degraded by the action of microorganisms.
The microorganisms or decomposers convert the organic substances into simpler inorganic substances and in this process of decomposition biogas is formed.
Biogas can be used for cooking purpose and is a great alternative for fossil fuels because biogas doesn't cause pollution.
The nutrient-rich manure is used in agriculture to enhance the growth of crops and plants.
So, the correct answer is 'biogas and manure'.
Which of the following is the correct example for the use of clean water?
Report Question
0%
Drinking
0%
Cooking
0%
Irrigation
0%
All of the above
Explanation
The common uses of clean water include the following activities-
Drinking
of clean and safe water
Cooking
food requires clean water.
Agricultural activities such as
Irrigation.
Option D is correct.
The direct discharge of pollutants into water bodies leads to
Report Question
0%
Water pollution
0%
Soil pollution
0%
Air pollution
0%
All of the above
Explanation
Water pollution is the mixing of contaminants to the water bodies (e.g., lakes, rivers, oceans, aquifers and groundwater) which changes the desired quality of water. Water pollution affects the entire biosphere, plants and organisms living in these bodies of water.
An example of water-borne disease is
Report Question
0%
Scabies
0%
Influenza
0%
Trachoma
0%
Typhoid
Explanation
Typhoid is spread by eating or drinking food or water contaminated with faeces of an infected person. So, typhoid is a water borne disease.
Scabies is caused by the dog bite and so it is an animal-borne disease.
Influenza is transmitted sexually or through the blood transfusions from the diseased persons so it is not a waterborne disease.
Trachoma is a sexually transmitted disease. Trachoma spreads through contact with discharge from the eyes or nose of the infected person.
So, the correct option is D.
In which of the following process,
human excreta is completely converted to vermi cakes?
Report Question
0%
Vermicomposting
0%
Vermi-processing toilets
0%
Biogas production
0%
Sewage treatment
Explanation
$$\textbf {Correct Option (B):} $$
$$\textbf {Solution:} $$
$$\textbf {Option (A):} $$
$$\bullet$$ Vermicomposting is the process of converting household organic waste into manure.
$$\bullet$$ The organic matter is filled in the soil pits underground and earthworms are added into it.
$$\bullet$$ The soil bacterium and the earthworm together convert the waste into vermicompost that acts as manure for plants.
$$\textbf {Option (B):} $$
$$\bullet$$ Vermi-processing toilets are specially designed toilets where human faeces are converted into vermin cakes.
$$\bullet$$ This process is done with the help of earthworms that digest the excreta and it reduces contamination of nature as it isolates the excreta.
$$\bullet$$ The vermin cakes formed as a result of this toilet is used as green manure for plants.
$$\textbf {Option (C):} $$
$$\bullet$$ Biogas production is one by anaerobic bacteria in large tanks containing organic waste.
$$\bullet$$ The waste is digested by these bacteria in absence of oxygen releasing methane as the biogas.
$$\textbf {Option (D):} $$
$$\bullet$$ Sewage treatment is the process of digestion of organic waste and separation of solid particles from the waste water.
$$\bullet$$ This treatment is done to ensure the minimum amount of contaminants to be present in the waste water that will be released into the oceans or rivers.
Hence, the option(B) is the correct answer.
Chlorine tablet is used to remove .......... from waste water.
Report Question
0%
Odour
0%
Dark colour
0%
Bacteria
0%
All of the above
Explanation
Disinfectants are chemical agents applied to non-living objects in order to destroy bacteria, viruses, fungi, or mold living on the objects i.e. to sterilize them. For example - chlorine tablets.
They are made of calcium hypochlorite. These tablets dissolve in the wastewater, releasing the hypochlorite, which then becomes hypochlorous acid, the primary disinfectant.
Chlorine tablets are used to remove odour, dark colour, and many types of bacteria and viruses from wastewater.
Hence, Option "D" is correct.
Which of the following happens when the garbage in dumped into the rivers?
Report Question
0%
Fishes and water plants die
0%
Water becomes unfit for drinking
0%
The inlets and ground water sources are blocked
0%
All of the above
Water pollution can be decreased by proper collection and disposal of domestic sewage.
Report Question
0%
True
0%
False
Explanation
Proper disposal of the domestic waste before it goes in to the lakes and oceans is useful in preventing water pollution. Domestic sewage which is the waste water that goes out into the environment through several routes should be treated before being released. It contains soaps, detergents, toilet paper, household refuse all of which causes water pollution. All this sewage should be properly collected and treated in which contaminants are removed from sewage to produce sludge suitable for discharge into the environment.
Thus, the correct answer is option A.
What is the main cause of pollution of water in India?
Report Question
0%
Discharge of untreated sewage
0%
Bathing
0%
Discharge of industrial waste
0%
Both A and C
Explanation
Water pollution is caused by the addition of the unwanted substances in the water bodies. The main causes of the water pollution is due to the discharge of the water effluents from various sources such as the industrial waste and untreated sewage. The harmful pollutants are added to the water resources from these sources which degrade the quality of the water.
Thus, the correct answer is option D.
State whether the following statements are "True or False.'' In case a statement is false, write the correct statement.
Sewage is a solid waste that causes water pollution and soil pollution.
Report Question
0%
True
0%
False
Explanation
The given statement is False. Sewage is not a solid waste but a liquid waste and causes water and soil pollution.
0:0:1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
0
Answered
0
Not Answered
0
Not Visited
Correct : 0
Incorrect : 0
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Practice Class 7 Biology Quiz Questions and Answers
<
>
Support mcqexams.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page
