Self Studies
Self Studies
Self Studies
Self Studies
Selfstudy
Selfstudy

Environmental Issues Test - 84

Result Self Studies

Environmental Issues Test - 84
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    Depletion of the Ozone layer in the stratosphere is caused by.
    Solution

  • Question 2
    1 / -0
    A large quantity of urban sewage is drained to a nearby river. Which among the given conditions would happen after mixing of sewage into the river?
    (i) BOD of receiving water body increases.
    (ii) DO of receiving water body decreases.
    (iii) It will not cause mortality among fishes and other aquatic creatures.
    (iv) It will lead to nutrient enrichment of receiving water body.
    Solution
    A large quantity of urban sewage will have a large amount of organic and inorganic material. Due to this, the decomposition of the organic mass will initiate the use of dissolved oxygen and so, the DO of receiving water body decreases. This will cause increase in the biological oxygen demand (BOD) by the decomposing bacteria. As the DO decreases, the aquatic animals will suffocate and die. Also, the inorganic nutrients, as well as the decomposed nutrients, will cause lush growth of algae, causing algal bloom over the surface of the water, which will further decrease the DO by not allowing the mixing of atmospheric oxygen.
    Hence, the correct answer is 'i, ii, iv'
  • Question 3
    1 / -0
    Which type of toxicity was experience by survivors of Nagasaki and Hiroshima?
    Solution
    By the end of 1945, the atomic bombings of Japan had killed an estimated 140,000 people at Hiroshima and 74,000 at Nagasaki, including those who died from radiation poisoning. Often lost in those numbers are the experiences of the survivors, known as hibakusha (literally “atomic bomb-affected people.
    So the correct answer is 'Radioactive'.
  • Question 4
    1 / -0
    Relation between DO and BOD is that they
    Solution
    Biological Oxygen Demand (BOD) is a measure of the oxygen used by microorganisms to decompose this waste. This results in a high BOD level. When BOD levels are high, dissolved oxygen levels decrease because the oxygen that is available in the water is being consumed by the bacteria.
    So the correct answer is 'Are inversely proportional'.
  • Question 5
    1 / -0
    Chemically, DDT is a
    Solution
    DDT stands for dichlorodiphenyltrichloroethane.
    It is sort of a colourless and odourless crystalline chemical compound. It is an organochlorine compound which is used as an insecticide.
    So, the correct option is 'organochlorine compound'


  • Question 6
    1 / -0
    Accelerated eutrophication occurs due to?
    Solution
    Eutrophication is the natural aging of a lake by nutrient enrichment of its water. With time, streams draining into the lake introduce nutrients such as nitrogen and phosphorus, which encourage the growth of algae. This results in algal blooms that lead to the deterioration of water quality and fish mortality.
    Thus, the correct answer is option B. 
  • Question 7
    1 / -0
    Which of the following statement/s is/are correct with regard to ozone depletion:
    1. The ozone hole is measured in terms of ozone concentrations, which is expressed in Dobson units.
    2. The major cause for ozone depletion is the presence of CFCs in the stratosphere - CFCs are entirely man-made and not found naturally.
    Solution
    • CFCs and other halogenated ozone depleting substances (ODS) are mainly responsible for manmade chemical ozone depletion.
    • The total amount of effective halogen (Chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine.
    So, the correct option is 'Both A and B'.
  • Question 8
    1 / -0
    The first pesticide to be used commercially was
    Solution
    The first important synthetic organic pesticide to be used commercially was DDT. It was discovered in 1939 by a Swiss chemist Paul Muller.
    So, the correct option is 'DDT'
  • Question 9
    1 / -0
    The given figures represent two devices A and B used to control air pollution. Identify them and select the correct answer.

  • Question 10
    1 / -0
    Ozone layer of upper atmosphere is being destroyed by
    Solution
    $$ { CFC }_{ s } $$ are widely used as refrigerants. $$ { CFC }_{ s } $$ discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing CI atoms. CI degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; CI atoms are not consumed in the reaction. $$ { CFC }_{ s } $$ added to the stratosphere have permanent and continuing affects on ozone levels.
    So, the correct answer is 'Chlorofluorocarbons'.
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now