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Natural Resources Test - 39

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Natural Resources Test - 39
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  • Question 1
    1 / -0
    During summer, Boojho carries water in a transparent plastic bottle to his school. One day he left his bottle in the school. The bottle still had some water left in it. The following day, he observed some water droplets on the inner surface of the empty portion of the bottle. These droplets of water were formed due to
    Solution
    In summers, the water in the plastic bottles gets heated and evaporates. This evaporated water collides with the cover of the bottle and gets condensed to form water droplets. These water droplets then get collected on the empty portion of the bottle.
    Hence, the correct answer is option (c) evaporation and condensation.
  • Question 2
    1 / -0
    In an activity, a teacher dissolved a small amount of solid copper sulphate in a tumbler half-filled with water. Which method would you use to get back solid copper sulphate from the solution?
    Solution
    On evaporating the solution, only the water will be evaporated, and solid copper sulphate will be left.
    Hence, the correct answer is option (b) Evaporation. 
  • Question 3
    1 / -0
    Paheli asked for a glass of water from Boojho. He gave her a glass of ice-cold water. Paheli observed some water droplets on the outer surface of the glass and asked Boojho how these droplets of water were formed? Which of the following should be Boojhos answer?
    Solution
    The surface ice-cold glass, when exposed to air, forms water droplets on the outer surface of glass because the water which is in the form of vapour in the atmosphere gets condensed.
    Hence, the correct answer is option (d) Condensation of atmospheric water vapour. 
  • Question 4
    1 / -0
    Oxygen is harmful for:
    Solution
    Oxygen is harmful for anaerobic bacteria. Among the given options, only Nitrogen fixing bacteria is an example of anaerobic bacteria.

    Hence, Option "B" is the correct answer.
  • Question 5
    1 / -0
    In Ozone, number of Oxygen atoms are:
    Solution
    The chemical formula of ozone is $$O_3$$
  • Question 6
    1 / -0
    Water exists in the form of
    Solution
    • Water occupies a very large area of the Earth's surface and is also found underground. Some amount of water exists in the form of water vapour in the atmosphere. Most of the water on Earth's surface is found in seas and oceans and is saline. 
    • Freshwater is found frozen in the ice caps at the two poles and on snowcovered mountains. The underground water and the water in rivers, lakes, and ponds are also fresh.
    Hence, the correct option is D.
  • Question 7
    1 / -0
    Western Ghats have high biodiversity because
    Solution
    Water is essential for maintaining life and biodiversity. Western Ghats are one of the regions with the highest biodiversity in India because they receive plenty of rainfall throughout the year and are covered by evergreen forests.
    Hence the correct option is A.
  • Question 8
    1 / -0
    Which one is not dangerous?
    Solution
    • The ozone layer is found in the upper part of the atmosphere called the stratosphere, and it acts as a shield absorbing ultraviolet radiation from the sun. 
    • UV rays are highly injurious to living organisms and cause various diseases such as skin cancer, cataract, etc.
    • Bio-pollutants, nuclear blast, deforestation cause pollution, and thus damage the environment.
    So, the correct answer is option B.
  • Question 9
    1 / -0
    Escherichia coli is used as an indicator organism to determine pollution of water with:
    Solution
    The presence of coliform bacteria, such as E. coli, in surface water, is a common indicator of fecal contamination. The number of coliform bacteria in water samples can be determined by the "most probable number method", a test, which assumes cultivable bacteria meet certain growth and biochemical criteria. If tests suggest that coliform bacteria are present in numbers in excess of the Coliform Index, fecal contamination is suspected.
  • Question 10
    1 / -0
    Of more immediate concern regarding carbon cycle is
    Solution
    The output rate of carbon locked in deposits of coal, petroleum and natural gas is of great concern. Carbon dioxide is a greenhouse gas that should be maintained with the proper atmospheric concentration. There was an increase in the total mass of carbon in the earth's atmosphere by 12-14%. The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, lithosphere, hydrosphere, and atmosphere of the Earth. 
    The amount of carbon on the Earth and in Earth's atmosphere is fixed, but that fixed amount of carbon is dynamic, always changing into different carbon compounds and moving between living and nonliving things. 
    Thus, the correct answer is option D.
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