Class 7 Science MCQ Waste water Story

Question : Which of these statements are correct about Ozone:

(a) it is essential for breathing of living organism
(b) it is used to disinfect water
(c) it absorbs ultra voilet rays
(d) its proportion in air is about 3%

Question : This is not the cause of water pollution:

(a) floods
(b) rains
(c) open defection
(d) chemicals

Question : Cooking oil and fats should not be thrown down the drain because

(a) They flow through the drain freely
(b) It allows the particles to get filtered
(c) They harden and block the pipe
(d) They break the pipe

Question : Better housekeeping practices includes

(a) Cooking oil and fats should not be thrown down the drain
(b) Chemicals like paints, solvents, insecticides should not be thrown the drain
(c) Used tea leaves,solid food , cottonshould not be thrown in the drain
(d) All of the above

Question : The increasing scarcity of fresh water is due to

(a) Population growth
(b) Pollution
(c) Industrial development
(d) All of the above

Question : Liquid waste consisting of suspended impurities is called

(a) Contaminant
(b) Sewage
(c) Aeration
(d) Chlorination

Question : WWTP stands for

(a) Waste Water Therapy Plant
(b) Waste Water Treatment Plant
(c) Waste Water Travel Plant
(d) Waste Water Tremendous Plant

Question : Water borne disease is

(a) Diabetes
(b) Cancer
(c) Appendicitis
(d) Cholera

Question : “By providing clean water and sanitation to the poorest people on the planet, we can reduce poverty and suffering and ensure education for all children.” The above words are given by

(a) UNO
(b) UNICEF
(c) UNESCO
(d) WHO

Question : Period 2005-2015 is being celebrated as the international decade for action on

(a) water for life
(b) education for all
(c) global war
(d) terrorism

Question : Name the scraper that removes solids like forced from the wastewater.

(a) Skimmer
(b) Sludge
(c) Tank
(d) All of these

Question : The technique of watering plants by making use of narrow tubings which deliver water directly at the base of the base of the plant is

(a) Lawn sprinkling
(b) Tube wells
(c) River-lift irrigation
(d) Drip irrigation

Question : Find the one which is a dried –up river

(a) Godavari
(b) Ganga
(c) Mahanadi
(d) Arveri e. k in colour

Question : Which of the following is a part of inorganic impurities of the sewage?

(a) Excreta
(b) Garbage
(c) Phosphate
(d) Vegetable waste

Question : In vermi-processing toilet the human excreta is treated by

(a) Redworm
(b) Tapeworm
(c) Earthworm
(d) Roundworm

Question : A resource much needed for soil is

(a) septic tank
(b) vermic processing toilet
(c) chemical toilet
(d) composting pit

Question : The impurities present in sewage may consist of

(a) organic substances
(b) inorganic substances
(c) Nutrients
(d) All of the above

Question : Water that is not fit for use is called

(a) clean water
(b) wastewater
(c) both (a) and (b)
(d) none of these

Question : The full form of WWP is

(a) World Wide Transport Programme
(b) Waste Water Treatment Plant
(c) World Worker Talent Programme
(d) None of these

Question : Period 2005-2015 is being celebrated as the international decade for action on

(a) water for life
(b) education for all
(c) global war
(d) terrorism

Question : Which of the following is wastewater?

(a) Water trickling from a damaged tap
(b) Water coming out of a shower
(c) Water flowing in a river
(d) Water coming out of a laundry

Question : Biodegradable wastes are generally

(a) Blended
(b) Synthetic
(c) Organic
(d) Inorganic

Question : The full form of WWP is

(a) World Wide Transport Programme
(b) Waste Water Treatment Plant
(c) World Worker Talent Programme
(d) None of these

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

(a) plastic packets
(b) sand
(c) grit
(d) All of the above

Question : Which of the following is not an inorganic impurity present in sewage?

(a) Nitrate
(b) Phosphorus
(c) Urea
(d) Metal salt

Question : Solid waste extracted during sewage treatment is known as

(a) sewage
(b) sludge
(c) biogas
(d) contaminants

Question : Sewage is a:

(a) liquid waste
(b) solid waste
(c) gaseous waste
(d) none of these

Question : The network of drainage pipe to carry waste water is called

(a) Sewer system
(b) Water supply system
(c) Drainage
(d) Waste water supply

Question : Adding air to treated water is called

(a) Fluorination
(b) Chlorination
(c) Aeration
(d) Oxygenation

Question : The process of removing pollutants in water before it enter a water body is called

(a) cleaning of water
(b) refining
(c) filtering of water
(d) none of these

Question : Excreta from the toilet seats flow through covered drains into a chemicals:

(a) chemicals
(b) biogas plant
(c) vermi-processing toilets
(d) none of these

Question : Which one is not a of household garbage

(a) Vegetable peels
(b) Dal packets
(c) Crockery pieces
(d) Cow dung

Question : The aerobic bacteria can be grown in clarified water by

(a) filtration
(b) sewage
(c) aeration
(d) sedimentation

Question : Open drain system is a breeding place for which of the following:

(a) Files
(b) Mosquitoes
(c) Organisms which cause diseases
(d) All of these