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
-
» Measurement And SI Units
-
» Measuring Devices And Scales
-
» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
-
» Force Of Gravity, Solids And Fluids
-
» Motion Under Gravity
-
» Physical Properties Of Materials
-
» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
-
» Electric Current And Magnetism
-
» Nuclear Physics And Conductivity
-
» Modern And Space Physics, Sources Of Energy
-
» General Concepts Of Chemistry
-
» Nature Of Matter And Composition
-
» Atomic Structure Molecules And Nuclear Chemistry
-
» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
-
» Metals, Non Metals, Minerals, Ores, Properties, Uses
-
» Alloys, Carbon & Its Various Forms, Hydrogen & Compounds, Sulphur, Nitrogen, Halogen & Inert Gases
-
» Acids, Bases, Salts And Metals
-
» Hydrocarbon, Alcohol, Polymer, Organic Acid And Explosive Substance
-
» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
-
» Inorganic Chemistry
-
» Organic Chemistry
-
» Environmental Chemistry
-
» Some Important Man Made Materials
-
» Sub Divisions Of Biology
-
» Genetics, Evolution Of Life & Ecological Biodiversity
-
» Taxonomy
-
» Heredity
-
» Biofertilizer
-
» Biological Classification Cell Tissues And Division
-
» Human Anatomy
-
» Blood Transport System
-
» Digestion And Excretion
-
» Photosynthesis
-
» Vitamins, Nutrition, Health, Disease And Treatment
-
» Endocrine Glands, Hormones
-
» Physiology Of Plants, Humans And Animals
-
» Reproduction
-
» Genetic Engineering And Bio Technology
RECENT BLOGS
Recently Added Subject & Categories For All Competitive Exams
SSC STENO: Time & Work Questions Solved Problems with PDF
Free Time and work Aptitude-based Practice multiple questions with solutions, Quiz series, Mock Test & Downloadable PDF for SSC Steno (Grade C & D) 2024 Exam
Continue Reading »
SSC STENO 2024: Free Reading Comprehension MCQ Test PDF
Top Reading Comprehension English Section-wise multiple choice questions and answers, Full Mock Test Series & Online Quiz for SSC Steno Grade C & D 2024 Exam
Continue Reading »
Free Percentage Questions Answers for SSC STENO 2024 Exam
Important Top Percentage Aptitude-based multiple choice questions and answers practice quiz series, Online Mock Test PDF for SSC Steno Grade C & D 2024 Exam
Continue Reading »
Free Antonyms (English) MCQ Test for SSC STENO 2024 Exam
Top Antonyms General English Section-based multiple choice questions and answers, Free Full Test Series & Online Quiz PDF for SSC Steno Grade C & D 2024 Exam
Continue Reading »