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Layers of Earth

Assertion: At...

Question

Assertion: At great heights from the surface of earth, ionisation of air is less
Reason: Ionisation of air depends on the distance of respective layer from the Sun

A

Assertion and reason are true and reason is the correct explanation of assertion

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B

Assertion and reason are true but reason is not correct explanation of assertion

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C

Assertion is true but reason is false

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D

Assertion is false but Reason is true

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Solution

The correct option is A Assertion and reason are true and reason is the correct explanation of assertion
The degree of ionisation varies with theheight. The density of atmosphere decreases with height. At great heightsthe solar radiation is intense but there are few molecules to be ionised. Close to the earth, even though the molecular concentration is very high, the radiation intensity is low so that the ionisation is again low.

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Similar questions

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
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Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
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Assertion (A): Steel is more elastic than rubber.

Reason (R) : Under a given deforming force, steel is deformed less than rubber.

A) Both Assertion and Reason are true and the reason is correct explanation of the assertion
B)Both Assertion and Reason are true, but reason is not correct explanation of the assertion
C) Assertion is true, but the reason is false
D) Assertion is false, but the reason is true

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Assertion: A circle is not a rectilinear figure.
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