Given below are two statements, one labelled as Assertion (A) and the other as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:
Assertion (A):A wind mill will be more effective if it is placed at a higher elevation above the ground than a lower one.
Reason (R):Generally, the wind speed increases with altitude above the earth's surface.
ABoth A and R are correct and R is the correct explanation of A ✓ Correct
BBoth A and R are correct but R is not the correct explanation of A
CA is correct but R is not correct
DA is not correct but R is correct
Correct answer: (A) Both A and R are correct and R is the correct explanation of A
Explanation
A windmill placed higher does capture stronger wind, and rising wind speed with height correctly explains why.
Near the ground, friction from land, trees and buildings slows the wind.
Higher above the surface this drag fades and wind moves faster, giving more energy to the blades.
Wind power rises with the cube of wind speed, so even a small speed gain boosts output sharply.
The reason states that wind speed generally increases with altitude, which is accurate.
This is why modern turbines use tall towers reaching a hundred metres or more.
Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.
Practise on Mcqkart →🎓 Book an expert →