Question

Assertion (A):

It's colder on mountains than it is on plains.

Reason (R):

When altitude decreases, so does the temperature.

(A) A is true but R is false.

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

(C) A is false but R is true.

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

(E) Both A and R are false.

Answer 1

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Answer 2

Assertion (A):  It's colder on mountains than it is on plains.

Reason (R):  When altitude decreases, so does the temperature.

Both A and R are true and R is the correct explanation of A.

• The temperature variations between the Mountains and the Plains can be explained by one geographical factor. Mountains have a much higher height (or altitude) than plains in terms of geography. The plains are lower in elevation.
• As a result, the temperature drops with increasing height according to the typical lapse rate.
• As one climbs higher above sea level, the temperature drops by 1 -degree centigrade for every 165 meters gained, making mountain tops colder.
• The air pressure as in mountains is lesser than on the lowlands. Because of the low pressure, the temperature on the mountain is cooler than on the lowlands.

Therefore, It's colder on mountains than it is on plains.