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11th Standard Chemistry Environmental Chemistry English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

11th Standard

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Chemistry

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

    Answer all the questions

    20 x 1 = 20
  1. Which of the following is natural and human disturbance in ecology?

    (a)

    Forest fire

    (b)

    Floods

    (c)

    Acid rain

    (d)

    Green house effect

  2. Ozone depletion will cause

    (a)

    forest fires

    (b)

    eutrophication

    (c)

    bio magnification

    (d)

    global warming

  3. Living in the atmosphere of CO is dangerous because it

    (a)

    Combines with O2 present inside to form CO2

    (b)

    Reduces organic matter of tissues

    (c)

    Combines with haemoglobin and makes it incapable to absorb oxygen

    (d)

    Dries up the blood

  4. Biochemical oxygen Demand value less than 5 ppm indicates a water sample to be

    (a)

    highly polluted

    (b)

    poor in dissolved oxygen

    (c)

    rich in dissolved oxygen

    (d)

    low COD

  5. Assertion (A): Excessive use of chlorinated pesticide causes soil and water pollution.
    Reason (R) : Such pesticides are non-biodegradable.

    (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

  6. Which of the following is responsible for acid rain?

    (a)

    CO2

    (b)

    NO2

    (c)

    CO2

    (d)

    All of these

  7. High concentration of lead in human blood damages

    (a)

    Brain

    (b)

    Liver

    (c)

    Both (a) & (b)

    (d)

    Neither (a) nor (b)

  8. Which one of the followings affects chlorophyll?

    (a)

    SO3

    (b)

    SO2

    (c)

    CO2

    (d)

    NO2

  9. NO2 and SO2 have some properties in common. Which property shown by one of these compounds, but not by the other?

    (a)

    Forms acid

    (b)

    Is a reducing agent

    (c)

    Is soluble in water

    (d)

    is a it is used as a food-preservative

  10. 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

  11. Pick the viable pollutant among the following.

    (a)

    Smoke

    (b)

    Mould

    (c)

    Mist

    (d)

    Fumes

  12. Which one of the following is not a property of classical smog?

    (a)

    Secondary pollutants play significant role

    (b)

    Occurs at low temperature

    (c)

    Contains SO2

    (d)

    Dark brown coloured

  13. Earth is protected from UV rays by

    (a)

    N2

    (b)

    O2

    (c)

    SO2

    (d)

    O3

  14. 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

  15. Which causes water pollution?

    (a)

    Jet planes

    (b)

    Herbicides

    (c)

    Smoke

    (d)

    Combustion of fossils

  16. Decomposition of organic matter through microbial activity is known as

    (a)

    Eutrophication

    (b)

    Putrescibility

    (c)

    BOD

    (d)

    Stratification

  17. Statement I : Value of COD is greater than BOD:
    Statement II : Used oxygen is demanded by: some chemicals for oxidation of I inorganic and organic pollutants.

    (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 t

    (c)

    Statement Iis true but statement II is false

    (d)

    Both statement Iand II are false

  18. 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

  19. Which one of the following gases is not present in troposphere?

    (a)

    N2O2

    (b)

    CO2

    (c)

    N2

    (d)

    water vapours

  20. Photochemical smog occurs in warm, dry and sunny climate. One of the following is not amongst the components of photochemical smog. Identify it.

    (a)

    NO2

    (b)

    O3

    (c)

    SO2

    (d)

    Unsaturated hydrocarbons

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