Question

Assertion (A): With increase in altitude the circular horizon of the earth's surface also widens.

Reason (R): The earth's surface is flat.

Options

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

• Both A and R are true but R does not explain A.

• A is true but R is false.

• A is false but R is true.

Answer 1

A is true but R is false.

Explanation:

• Assertion (A) is true: With an increase in altitude, the visible circular horizon indeed widens. This is because, as you move higher up, you can see a larger portion of the Earth's surface, and the horizon expands, maintaining a circular shape.
• Reason (R) is false: The Earth’s surface is not flat; it is spherical, as confirmed by various observations like the sighting of ships, satellite images, and the Bedford Level experiment. A flat Earth would not have a circular horizon that widens with altitude.