CBSE Class 7 Science Wastewater Story MCQs Set 02

Question: What is the main source of water pollution in India?
a) Municipal sewage
b) Bathing
c) Industrial discharge
d) Both Municipal sewage and Industrial discharge
Answer: d

Question: The discharge of industrial waste is called –
a) Effluent
b) Sewer
c) Sewerage
d) Sludge
Answer: a

Question: Khadins are used in Rajasthan to
a) hold water for irrigation
b) recharge groundwater
c) promote soil erosion
d) trap wild animals
Answer: b

Question: Water is disinfected by –
a) Chlorine
b) Ozone
c) UV-radiations
d) all of the options
Answer: d

Question: An immediate result of excessive hot water discharge into a lake will most likely be –
a) an increase in the sewage content of the lake
b) an increase in the amount of dissolved oxygen in the lake
c) an increase in the amount of PCB pollution in the lake
d) a decrease in the amount of phosphates in the lake
Answer: b

Question: All of earth’s water, land and atmosphere, within which life exists is known as
a) a population
b) a community
c) a biome
d) the biosphere
Answer: d

Question: A fuel produced by anaerobic fermentation of sludge is –
a) Biogas
b) Petrol
c) Kerosene
d) Wood
Answer: a

Question: Which of the following is not an ancient water harvesting structure?
a) kattas
b) sargam
c) kulhs
d) surangams
Answer: b

Question: Ahars, kattas, Bhundhis and Khadins are the modes of
a) grain storage
b) soil conservation
c) water harvesting
d) cold storage
Answer: c

Question: The pH of a river sample was 3.5 to 4.5. This is likely due to waste from a
a) soap and detergent manufacturing factory
b) car battery manufacturing factory
c) alcohol manufacturing factory
d) plastic cups moulding factory
Answer: b

Question: Which of the following is not a natural resource?
a) soil
b) water
c) electricity
d) natural gas
Answer: c

Question: The light materials which float during waste water treatment is –
a) Sludge
b) Scum
c) Biogas
d) Sewer
Answer: b

Question: The three R’s to conserve natural resources are
a) recycle, regenerate, reuse
b) reduce, regenerate, reuse
c) reduce, reuse, redistribute
d) reduce, recycle, reuse
Answer: d

Question: The main reason for coliform bacteria in Ganga water is
a) immersion of ashes of the dead
b) washing of clothes
c) industrial waste discharge
d) disposal of unburnt corpses
Answer: d

Question: Sewage is often processed with the help of –
a) Septic tank
b) Over tank
c) Both Septic tank and Over tank
d) None of the options
Answer: c

Question: Primary treatment is a –
a) Mechanical process
b) Chemical process
c) Biological process
d) None of the options
Answer: a

Question: Waste water containing human excreta is known as –
a) Sewage
b) Sewer
c) Sewerage
d) None
Answer: a

Question: Which disease is caused by contaminated water?
a) Gastroenteritis
b) Malaria
c) Flu
d) None of the options
Answer: d

Question: Groundwater will not be depleted due to
a) process of afforestation
b) establishing thermal power plants
c) process of deforestation
d) cultivation of high yielding crops
Answer: a

Question: The discharge of industrial wastewater is called –
a) Industrial effluents
b) Oil spill
c) Both Industrial effluents and Oil spill
d) None of the options
Answer: a

Question: Which sector is the single-largest consumer of fresh water in India?
a) Agriculture
b) Industry
c) Domestic
d) Power
Answer: a

Question: Wastewater generated from houses is commonly called
a) sludge
b) sewage
c) effluent
d) none of the options
Answer: b

Question: What is the origin of energy that drives the water cycle?
a) Trees
b) Water
c) Mountains
d) Sun
Answer: d

Question: Malaria can be triggered by
a) open drains
b) closed drains
c) taps
d) pipelines
Answer: a

Question: Which of the following is not found in polluted water?
a) Blue green algae
b) Larvae of stone fly
c) Water hyacinth
d) Sewage fungi
Answer: b

Question: Stage of wastewater treatment of removing large particles
a) disinfection
b) secondary
c) primary
d) chlorination
Answer: c

Question: Disinfection of water is done by
a) chlorine
b) ozone
c) UV radiation
d) all of the options
Answer: a

Question: Water that moves over the surface of the ground into lakes and rivers is called
a) ground water
b) a water table
c) run-off
d) the water cycle
Answer: c

Question: What minerals are found in the run-off from agricultural land and untreated sewage effluents that are responsible for eutrophication of water bodies?
a) Phosphorus and carbon
b) Nitrogen and phosphorus
c) Potassium and arsenic
d) Iron and manganese
Answer: b

Question: Water harvesting is
a) collection of river water
b) collection of rainwater in storage tanks or in the soil to recharge ground water
c) harvesting of water from tube wells
d) all of the above
Answer: b

Question: Waste that can be broken down by bacteria
a) biological
b) biochemical
c) biodegradable
d) chemical
Answer: a

Question: The disease caused by polluted water
a) jaundice
b) dysentery
c) cholera
d) all of the options
Answer: d

Question: Which of the following processes is involved in the water cycle?
a) Evaporation, hibernation and dehydration
b) Evaporation, condensation and precipitation
c) Paddling, swimming and drinking
d) Bathing, sunning and drinking
Answer: b

Question: Sewage is a kind of
a) agricultural waste
b) liquid waste
c) mining waste
d) gaseous waste
Answer: b