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

Questions
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
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
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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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