Question

Assertion: Land and sea breezes are caused in coastal regions.

Reason: The specific latent heat of vaporization of water (or steam) is the highest.

• A. Both ‘A’ and ‘R’ are correct and ‘R’ is the correct explanation of ‘A’.
• B. Both ‘A’ and ‘R’ are correct, but ‘R’ is not the correct explanation of ‘A’.
• C. ‘A’ is correct, but ‘R’ is incorrect
• D. ‘A’ is incorrect, but ‘R’ is correct

Answer 1

The correct option is B

Both ‘A’ and ‘R’ are correct, but ‘R’ is not the correct explanation of ‘A’.

The explanation for the assertion:

1. During the nighttime, due to the high pressure above the surface of the land and the low pressure on the surface of the ocean, the cool air flows from the land to the sea, which is called a land breeze.
2. During the daytime, due to the high pressure above the surface of the sea and the low pressure on the surface of the land, the cool air blows from the sea to the land, which is called a sea breeze.

The explanation for the reason:

1. The specific latent heat of vaporization of steam is the amount of heat energy required to change the unit mass of water at 100 °C into steam at 100 °C.
2. Its value is 226 x 10⁴ J kg^-1.
3. Water has the highest specific latent heat of vaporization.

Hence, the answer is (B) Both ‘A’ and ‘R’ are correct, but ‘R’ is not the correct explanation of ‘A’.