Q. The longest circle which can be drawn on the earth's surface passes through

Explanation by: Mr. Dubey

The Equator is the longest circle that can be drawn on the Earth's surface.

It is a great circle, meaning it divides the Earth into two equal halves (Northern and Southern Hemispheres).

The Equator has a circumference of approximately 40,075 km.


Other Options Explained:

(B) Tropic of Cancer → Incorrect, as it is a smaller circle located at 23.5° North latitude.

(C) Arctic Circle → Incorrect, as it is even smaller, located at 66.5° North latitude.

(D) Tropic of Capricorn → Incorrect, as it is also a smaller circle at 23.5° South latitude.


Thus, the correct answer is (A) Equator.