New ! Chemistry MCQ Practise Tests

11th Standard Chemistry Environmental Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021

11th Standard

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

    Answer all the questions

    20 x 1 = 20
  1. The gaseous envelope around the earth is known as atmosphere. The region lying between an altitudes of 11-50 km is __________

    (a)

    Troposphere

    (b)

    Mesosphere

    (c)

    Thermosphere

    (d)

    stratosphere

  2. The pH of normal rain water is

    (a)

    6.5

    (b)

    7.5

    (c)

    5.6

    (d)

    4.6

  3. Identify the wrong statement in the following

    (a)

    The clean water would have a BOD value of more than 5 ppm

    (b)

    Greenhouse effect is also called as Global warming

    (c)

    Minute solid particles in air is known as particulate pollutants

    (d)

    Biosphere is the protective blanket of gases surrounding the earth

  4. Release of oxides of nitrogen and hydrocarbons into the atmosphere by motor vehicles is prevented by using __________

    (a)

    grit chamber

    (b)

    scrubbers

    (c)

    trickling filters

    (d)

    catalytic convertors

  5. Match the List I with List II and select the correct answer using the code given below the lists

      List I     List II  
     A. Depletion of ozone layer     1. CO2    
     B. Acid rain  2. NO
     C. Photochemical smog  3. SO2
     D. Green house effect  4. CFC
    (a)
     A   B   C   D 
     3  4  1  2
    (b)
     A   B   C   D 
     2  1 4 3
    (c)
     A   B   C   D 
     4  3 2 1
    (d)
     A   B   C   D 
     2  4 1 3
  6. Assertion (A): If BOD level of water in a reservoir is more than 5 ppm it is highly polluted
    Reason(R) : High biological oxygen demand means high activity of bacteria in water

    (a)

    Both (A) and R are correct and (R) is the correct explanation of (A)

    (b)

    Both (A) and R are correct and (R) is not the correct explanation of (A)

    (c)

    Both (A) and R are not correct

    (d)

    (A) is correct but( R) is not correct

  7. __________ is responsible for global warming.

    (a)

    CO2

    (b)

    NO2

    (c)

    N2O

    (d)

    None of these

  8. The pH of acid rain is

    (a)

    Equal to 7

    (b)

    Less than 5.6

    (c)

    More than 5.6

    (d)

    Between 7.0 - 9.0

  9. The pollutants that degrade naturally are called ______ pollution

    (a)

    Bio-degradable

    (b)

    Non-biodegradable

    (c)

    Primary

    (d)

    Secondary

  10. Pick out the pollutant(s) that causes eye irritation

    (a)

    CO2

    (b)

    NO2

    (c)

    SO2

    (d)

    All of these

  11. Green house gases cause

    (a)

    Increase in temperature of atmosphere

    (b)

    Prevents global warming

    (c)

    Trap UV rays

    (d)

    All the above

  12. Statement I : Global warming is due to Green house effect.
    Statement II : Green house gas is CH4

    (a)

    Both statement I and statement II are true and statement II explains statement I

    (b)

    Both statement I and statement II are true but statement II does not explain statement I

    (c)

    Statement I is true but statement II is false

    (d)

    Both statement I and II are false

  13. The pollutants of troposphere contain __

    (a)

    Dust

    (b)

    Water Vapours

    (c)

    Mist

    (d)

    All of these

  14. Photochemical smog actually causes __________

    (a)

    Soil pollution

    (b)

    Noise pollution

    (c)

    Water pollution

    (d)

    Air pollution

  15. In Antartica, ozone layer depletion is due to the formation of

    (a)

    Peroxy acetyl nitrate

    (b)

    Acrolein

    (c)

    Chlorine nitrate

    (d)

    SO2 and SO3

  16. Statement I: Photochemical smog is also known as oxidizing smog.
    Statement II: Photochemical smog .is chiefly composed of O3, PAN, etc

    (a)

    Both statement I and statement II are true and statement II explains statement I

    (b)

    Both statement I and statement If are true but statement II does not explain statement I

    (c)

    Statement Lis true but statement II is false

    (d)

    Both statement I and II are false

  17. Which causes water pollution?

    (a)

    Jet planes

    (b)

    Herbicides

    (c)

    Smoke

    (d)

    Combustion of fossils

  18. Cause of eutrophication is

    (a)

    Increase of oxygen in water bodies

    (b)

    Increase in number of aquatic organisms

    (c)

    Nutrient enrichment of water bodies

    (d)

    All ofthese

  19. BOD5 is

    (a)

    Oxygen used in 5 days

    (b)

    Waste decomposed in 5 days

    (c)

    Microorganisms killed in 5 days

    (d)

    Dissolved oxygen left after 5 days

  20. BOD values less than 5 ppm indicates a water sample to be

    (a)

    Poor in dissolved oxygen

    (b)

    rich in dissolved oxygen

    (c)

    Highly polluted

    (d)

    Not suitable for aquatic life

*****************************************

TN 11th Standard Chemistry free Online practice tests

Reviews & Comments about 11th Standard Chemistry Environmental Chemistry English Medium Free Online Test One Mark Questions 2020 - 2021

Write your Comment