Question

ASSERTION: In the desert area, days get hot fastly and the nights get cold fastly.
REASON: The specific heat capacity for air and land is less than water.
(A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
(B) Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
(C) Assertion is correct but Reason is incorrect
(D) Both Assertion and Reason are incorrect

Answer 1

Hint
The temperature in the desert can vary radically from day and night because the air is so dry that heat breaks out expeditiously at the time of night. The temperature also differs greatly determined by the location of the desert on earth.

Complete step by step answer
The deserts have such a small amount of water vapor in the air, it makes it extremely difficult to entrap heat or cold in a desert. At the time of night, the sun no longer heats the desert and the heat during the time of day does not stay entrapped. Due to this, some of the deserts can get extremely cold at night, descending to below $40\,\,F$ .
At the time of day, due to sunlight, heat is getting added to the earth's surface. That is, for a given amount of heat, a body with low specific heat volume increases to greater temperature than the body with high specific heat volume. This is due to the particular heat volume is the heat needed to increase the temperature of a body.
Therefore, the desert sand getting very hot during the day and very cold during the night implies that the specific heat capacity of the desert sand is low.
Hence the option (A) Both Assertion and Reason are correct and Reason is the correct explanation for Assertion is the correct answer.

Note
The temperature at the daytime averages to ${38^ \circ }\,\,C$ while in some cases in some deserts the temperature can get down to $- {4^ \circ }\,\,C$ at the time of night. Deserts can be hot or cold, with great areas of infertile sand or snow or sandy gravel with robust vegetation.