environmental chemistry - Category wise Question and Answer Practice Test with Solutions
Question : 16
Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution. Fishes in such a polluted water die because of
a) increase in the amount of dissolved oxygen
b) decrease in the amount of dissolved oxygen in water
c) large number of mosquitoes
d) clogging of gills by mud
Answer »Answer: (b)
Question : 17 [CDS]
Some statements about the benefits of organic farming are given below. Indicate whether they are true or false using the codes given below the statements :
- It reduces CO2 emissions.
- It does not lead to toxic effects.
- It improves the water-retention capacity of the soil.
a) False - True - True
b) True - False - False
c) False - True - False
d) False - True - True
Answer »Answer: (a)
Question : 18
Which among the following statements is false?
a) The main reason for river water pollution is industrial and domestic sewage discharge.
b) Surface water contains a lot of organic matter mineral nutrients and radioactive materials.
c) Oil slick in sea water increases D.O. value.
d) Oil spill in sea water causes heavy damage to fishery.
Answer »Answer: (c)
Oil slick in sea water decreases D.O value.
Question : 19
Which of the following statements about polar stratosphere clouds (PSCs) is not correct?
a) Type I clouds are formed at about –77ºC and contain solid HNO3 . 3H2O
b) PSCs do not react with chlorine nitrate and HCl
c) Type II clouds are formed at about –85ºC and contain some ice
d) A tight whirlpool of wind called Polar Vortex is formed which surrounds Antarctica
Answer »Answer: (b)
PSCs react with chlorine nitrate and HCl to give HOCl and Cl2.
IMPORTANT general science mcq EXERCISES
set 3 Online Quiz
Click to Start..general science mcq CATEGORIES
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» Measurement And SI Units
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» Measuring Devices And Scales
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» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
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» Force Of Gravity, Solids And Fluids
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» Motion Under Gravity
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» Physical Properties Of Materials
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» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
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» Electric Current And Magnetism
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» Nuclear Physics And Conductivity
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» Modern And Space Physics, Sources Of Energy
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» General Concepts Of Chemistry
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» Nature Of Matter And Composition
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» Atomic Structure Molecules And Nuclear Chemistry
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» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
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» Metals, Non Metals, Minerals, Ores, Properties, Uses
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» Alloys, Carbon & Its Various Forms, Hydrogen & Compounds, Sulphur, Nitrogen, Halogen & Inert Gases
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» Acids, Bases, Salts And Metals
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» Hydrocarbon, Alcohol, Polymer, Organic Acid And Explosive Substance
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» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
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» Inorganic Chemistry
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» Organic Chemistry
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» Environmental Chemistry
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» Some Important Man Made Materials
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» Sub Divisions Of Biology
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» Genetics, Evolution Of Life & Ecological Biodiversity
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» Taxonomy
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» Heredity
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» Biofertilizer
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» Biological Classification Cell Tissues And Division
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» Human Anatomy
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» Blood Transport System
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» Digestion And Excretion
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» Photosynthesis
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» Vitamins, Nutrition, Health, Disease And Treatment
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» Endocrine Glands, Hormones
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» Physiology Of Plants, Humans And Animals
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» Reproduction
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» Genetic Engineering And Bio Technology
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