Last updated on December 9th, 2023 at 09:02 pm
Which low-cost onsite sewage disposal system is suitable for areas without sewerage?
a) Composting pits
b) Septic tanks
c) Chemical toilets
d) Sewerage plants
Answer: b) Septic tanks
To prevent pipe blockages, what type of waste should not be thrown down the drain?
a) Used tea leaves
b) Cooking oil and fats
c) Solid food remains
d) Cotton
Answer: b) Cooking oil and fats
What is the purpose of vermi-processing toilets?
a) To treat wastewater with chemicals
b) To produce biogas
c) To treat human excreta using earthworms
d) To store excess water
Answer: c) To treat human excreta using earthworms
What component of sewage contains harmful bacteria like cholera and typhoid?
a) Nutrients
b) Inorganic impurities
c) Organic impurities
d) Sediments
Answer: c) Organic impurities
Which component of sewage is treated by anaerobic bacteria to produce biogas?
a) Nutrients
b) Inorganic impurities
c) Organic impurities
d) Sediments
Answer: c) Organic impurities
Which process involves removing sand and grit from wastewater?
a) Biological process
b) Chemical process
c) Physical process (Screening)
d) Sedimentation process
Answer: c) Physical process (Screening)
MCQ on Class 7 Science Electric Current and its Effects
MCQ on Class 7 Science Light
MCQ on Class 7 Science Forests: Our Lifeline
