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(A): Ionosphere contains gases in the io...

(A): Ionosphere contains gases in the ionised form which form the bases for wireless communication
(R): The ions reflect back the radio waves to the earth.

A

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

B

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

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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Atmosphere, hydrosphere, lithosphere and biosphere are the four main segments of the environment. Atmosphere is a cover of gases that extends to a height of about 1600 km above the surface of the earth and protects the life on the earth from harmful radiations coming from the sun or the outer space. Atmosphere is further divided into four regions such as troposphere, stratosphere, mesosphere and thermosphere. Hydrosphere forms that part of the environment which contains water. Lithosphere is the solid component of the earth consisting of soil, rocks, mountains etc. Biosphere is that part of the above segments where living organisms interact with these parts and live together. Hydrogen and Helium are found in which of the following regions ?

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Atmosphere, hydrosphere, lithosphere and biosphere are the four main segments of the environment. Atmosphere is a cover of gases that extends to a height of about 1600 km above the surface of the earth and protects the life on the earth from harmful radiations coming from the sun or the outer space. Atmosphere is further divided into four regions such as troposphere, stratosphere, mesosphere and thermosphere. Hydrosphere forms that part of the environment which contains water. Lithosphere is the solid component of the earth consisting of soil, rocks, mountains etc. Biosphere is that part of the above segments where living organisms interact with these parts and live together. The biotic component of the environmentis

AAKASH SERIES-ENVIRONMENTAL CHEMISTRY-OBJECTIVE EXERCISE - 1 (Definition of terms- Introduction)
  1. Match the following

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  2. Assertion (A) : The temperature in the thermosphere increases with alt...

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  3. (A): Ionosphere contains gases in the ionised form which form the base...

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  4. Assertion (A) : Rain water normally has a pH of 5.6. Reason (R) : Th...

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  5. (A): Smaller particles (Size < 5 microns) cause fibrosis of the lung l...

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  6. Among the following which is a contaminent

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  7. Which of the following is contaminant responsible for Bhopal gas trage...

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  8. A substance which is not present in nature but added to atmoshphere du...

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  9. Identification of a pollutant as organic, inorgamic (or) organometalli...

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  10. The medium which reacts wi lh pollutant is called

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  11. The sink for dead plants and animals is

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  12. Which of the following can act as sink for CO2 and SO2

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  13. Water is said to be polluted if the D.O value of water is less than

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  14. The amount of oxygen required for healthy growth of plants and animals...

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  15. A good quality of water will have

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  16. The amount of oxygen required to oxidise organic substance present in ...

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  17. Chemical oxygen demand is determined by using

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  18. COD is a measure of

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  19. The amount of oxygen used by micro organisms present in water for five...

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  20. Which of the following is a measure of bacteria present in water

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