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245 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
101	A river stretch receiving untreated sewage will usually show:	Environmental Studies Water pollution	Easy
102	The standard BOD test measures oxygen consumed by microbes over:	Environmental Studies Water pollution	Medium
103	A 10 mL water sample is diluted to 300 mL. DO falls from 8.0 mg/L to 5.0 mg/L in the BOD test. The BOD of the…	Environmental Studies Water pollution	Hard
104	For the same water sample, COD is generally higher than BOD because:	Environmental Studies Water pollution	Medium
105	The presence of coliform bacteria such as E. coli in drinking water indicates:	Environmental Studies Water pollution	Easy
106	The two nutrients mainly responsible for eutrophication of lakes are:	Environmental Studies Lakes and eutrophication	Easy
107	The warm upper layer of a thermally stratified lake is called the:	Environmental Studies Lakes and eutrophication	Medium
108	In a eutrophic lake, fish die mainly because:	Environmental Studies Lakes and eutrophication	Medium
109	Compared with a eutrophic lake, an oligotrophic lake typically has:	Environmental Studies Lakes and eutrophication	Easy
110	Lakes in cold regions freeze from the top down and aquatic life survives below because:	Environmental Studies Lakes and eutrophication	Hard
111	In a jar (sedimentation) test, which soil fraction settles to the bottom first?	Environmental Studies Soil pollution	Easy
112	Which soil type has the highest water-holding capacity?	Environmental Studies Soil pollution	Easy
113	100 g of oven-dry soil weighs 140 g after it is soaked and allowed to drain. Its water-holding capacity is:	Environmental Studies Soil pollution	Medium
114	Which material is commonly added to correct acidic soil?	Environmental Studies Soil pollution	Medium
115	The polluted liquid that seeps out of a waste dump and can contaminate soil and groundwater is called:	Environmental Studies Soil pollution	Hard
116	Which of these is a push factor for rural-to-urban migration?	Environmental Studies Urbanisation	Easy
117	According to Census 2011, roughly what share of India’s population lived in urban areas?	Environmental Studies Urbanisation	Medium
118	The “urban heat island” effect means that:	Environmental Studies Urbanisation	Easy
119	For a settlement to be a census town in India, at least what share of its male main workers must be in non-ag…	Environmental Studies Urbanisation	Hard
120	The UN World Urbanization Prospects 2018 projected that by 2050 the share of the world’s population living in…	Environmental Studies Urbanisation	Medium