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

#	Question	Subject and topic	Difficulty
81	Fertiliser-laden runoff from many farm fields entering a river is an example of a:	Environmental Studies Pollutants, sources and sinks	Easy
82	Minamata disease, first reported in Japan in the 1950s, was caused by poisoning with:	Environmental Studies Pollutants, sources and sinks	Medium
83	The increase in concentration of a persistent pollutant such as DDT at successive levels of a food chain is c…	Environmental Studies Pollutants, sources and sinks	Easy
84	The Central Pollution Control Board was first set up under which Act?	Environmental Studies Pollutants, sources and sinks	Hard
85	The Environment (Protection) Act, 1986 was passed soon after which disaster?	Environmental Studies Pollutants, sources and sinks	Medium
86	Which of these is a secondary air pollutant?	Environmental Studies Air pollution	Easy
87	The ozone layer lies mainly in the:	Environmental Studies Air pollution	Easy
88	Rain is considered “acid rain” when its pH falls below about:	Environmental Studies Air pollution	Medium
89	Photochemical smog differs from classical smog because it:	Environmental Studies Air pollution	Hard
90	A layer of warm air lying over cooler air near the ground, which traps pollutants, is called:	Environmental Studies Air pollution	Medium
91	India’s revised National Ambient Air Quality Standards (2009) cover how many pollutants?	Environmental Studies Air quality standards and monitoring	Medium
92	A city reports an AQI of 350. Its air quality falls in which category?	Environmental Studies Air quality standards and monitoring	Easy
93	The 24-hour NAAQS limit for PM2.5 is:	Environmental Studies Air quality standards and monitoring	Hard
94	Why is PM2.5 considered more harmful to health than coarser particles?	Environmental Studies Air quality standards and monitoring	Medium
95	How is the overall Air Quality Index for a location decided?	Environmental Studies Air quality standards and monitoring	Easy
96	India moved to BS-VI emission norms nationwide on 1 April 2020 by skipping:	Environmental Studies Vehicular and industrial emissions	Easy
97	Which device is mainly used in thermal power plants to remove fine particles from flue gases?	Environmental Studies Vehicular and industrial emissions	Medium
98	A catalytic converter in a petrol car requires unleaded fuel because lead:	Environmental Studies Vehicular and industrial emissions	Medium
99	The switch of Delhi’s buses, taxis and autorickshaws to CNG followed an order in 1998 by the:	Environmental Studies Vehicular and industrial emissions	Easy
100	What is the maximum sulphur content allowed in BS-VI fuel?	Environmental Studies Vehicular and industrial emissions	Hard