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Environmental Studies Questions and Answers for Competitive Exams | Environmental Studies Quiz Set 4

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Free Download as PDF Environmental Studies Quiz Questions and Answers for Competitive Exams or solved MCQs with answers. These quiz objective questions are helpful for competitive exams SSC, UPSC, IAS, IPS, CDS, NDA, Railways or RRB, psc exams of Andhra Pradesh, Arunachal Pradesh, Assam, Bihar, Gujarat, Haryana, Himachal Pradesh, Jammu & Kashmir, Karnataka, Kerala, Madhya Pradesh, Maharashtra, Manipur, Meghalaya, Mizoram, Nagaland, Orissa, Punjab, Rajasthan, Sikkim, Tamil Nadu, Tripura, Uttar Pradesh, West Bengal, Chhattisgarh, Uttarakhand, Jharkhand, Telangana etc.
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(1) A local laboratory analyzed a water sample and determined that it contained a total solid (TS) content of 132 mg/L and a conductivity of 112 μS/cm. The total suspended solid (TSS) content (mg/L) of water will be
(1) ~ 57
(2) ~ 75
(3) ~ 32
(4) ~ 120
Answer: ~ 57
(2) The settling of discreet, non-flocculating particle in a dilute suspension is known as
(1) Class-I sedimentation
(2) Class-II sedimentation
(3) Class-III sedimentation
(4) Compression
Answer: Class-I sedimentation

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(3) The theoretical oxygen demand for a solution containing 500 mg/L of phenol will be
(1) 298 mg/L
(2) 596 mg/L
(3) 1191 mg/L
(4) 2382 mg/L
Answer: 1191 mg/L
(4) The compound p-dichlorobenze has been found to have KOM = 625. For a soil containing 1.6% organic matter, the distribution coefficient (Kd) will be
(1) 2
(2) 5
(3) 10
(4) 20
Answer: 10
(5) Removal of top fertile soil by water is called
(1) Leaching
(2) Siltation
(3) Weathering of soil
(4) Soil erosion
Answer: Soil erosion
(6) The evolution of genetic resistance to antibiotics among disease-carrying bacteria is an example of
(1) Directional natural selection
(2) Stabilizing natural selection
(3) Diversifying natural selection
(4) Convergent natural selection
Answer: Directional natural selection
(7) Pulmonary oedema is caused by
(1) Carbon monoxide
(2) Sulphur dioxide
(3) Nitrous oxide
(4) Methane
Answer: Nitrous oxide
(8) What is the half life of 131I ?
(1) 60 days
(2) 8 days
(3) 12 years
(4) 30 days
Answer: 8 days
(9) Chaparral, Maquis, Encinous, Melleseab are important areas of
(1) Tropical evergreen woodland
(2) Temperate evergreen woodland
(3) Tropical deciduous woodland
(4) Temperate deciduous woodland
Answer: Tropical evergreen woodland
(10) The Keystone predator species maintain diversity in a community by
(1) preying on community’s dominant species
(2) allowing immigration of other predators
(3) competitively excluding other predators
(4) coevolving with their prey
Answer: preying on community’s dominant species
(11) Which of the following is not an external factor controlling an ecosystem ?
(1) Climate
(2) Topography
(3) Parent material forming soil
(4) Microbes
Answer: Microbes
(12) Which of the following food chain is correct ?
(1) Phytoplankton → Zooplankton → Turtle → Crabs
(2) Phytoplankton → Zooplankton → Crab → Turtle
(3) Turtle → Crab → Zooplankton → Phytoplankton
(4) Zooplankton → Turtle → Crab → Phytoplankton
Answer: Phytoplankton → Zooplankton → Crab → Turtle
(13) Which of the following is not categorized as an internal factor of an ecosystem ?
(1) Decomposition
(2) Succession
(3) Root competition
(4) Bedrock
Answer: Bedrock
(14) Two species cannot remain in same place according to
(1) Allen’s law
(2) Gause hypothesis
(3) Doll’s rule
(4) Weismann’s theory
Answer: Gause hypothesis
(15) Freshwater ecosystems are nutritionally limited by
(1) Phosphorous and Iron
(2) Phosphorous and Carbon
(3) Iron and Nitrogen
(4) Nitrogen and Calcium
Answer: Phosphorous and Iron

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