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Assertion (A) : Ionosphere contains gase...

Assertion (A) : Ionosphere contains gases in the ionized from which form the basis for wireless communication.
Reason (R) : These ions reflect back the ratio 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 but R is not correct explanation of A

C

A is true and R ls false.

D

A ls false and R ls true.

Text Solution

Verified by Experts

The correct Answer is:
A
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Knowledge Check

  • Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface?

    A
    ionosphere
    B
    stratosphere
    C
    mesosphere
    D
    exosphere

  • The layer of the atmosphere which reflects the radio waves back to the earth is called?

    A
    Stratosphere
    B
    Tropopause
    C
    Troposphere
    D
    Ionosphere

  • Radio waves reflects back from which Layer ?

    A
    Troposphere
    B
    Stratosphere
    C
    Mesosphere
    D
    Ozone Layer
    • NARAYNA-ENVIRONMENTAL CHEMISTRY-EXCERCISE - IV (Asseration - Reason Type Questions)
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    3. Assertion (A) : The medium which is afffected by the pollutant is rece...

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    4. A : The lower the concentration of DO the more plluted is the water sa...

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    5. A : Atmosphere plays an important role in maintaining the heat balance...

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    6. Assertion (A) : Excess amount of CO, in air is responsible for green h...

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    7. Assertion (A) : Alkylated mercury is more toxic than mercury. Reason...

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    8. Green house effect is

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    9. Assertion (A) : Countries like Netherlands, Bangladesh and Maldives fa...

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    10. A: Acid rain reduces the fertility of the soil, R: Acid rain has a co...

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    11. Assertion (A) : Acid Rain water normally has a P^(H) of le 5.6. Rea...

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    12. Assertion (A) : The oxides of nitrogen and sulphur combine with rain w...

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    13. Assertion: The pH of aicd rain is less than 5.6 Reason: Carbon dioxi...

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    14. Assertion (A) : Acid rains have been reported in some places which are...

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    15. Assertion (A) : Aldehydes are one of the consituents of photochemical ...

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    16. A: Fluorosis results if F^(-) ion concentration exceeds 10 ppm in drin...

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    17. Assertion: Excessive use of chlorinated synthetic pesticides causes so...

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    18. Assertion: If BOD level of water in a reservoir is less than 5 ppm it ...

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