Question

Assertion (A): There is a time difference of a full day on crossing the ID L. 

Reason (R): It is diametrically opposite the Greenwich Meridian.

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

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

Explanation:

• Assertion (A) is true: When you cross the International Date Line (IDL), there is a time difference of a full day. If you move eastward, you lose a day, and if you move westward, you gain a day. This is because the IDL marks the transition from one day to the next.
• Reason (R) is true: The IDL is diametrically opposite the Greenwich Meridian (0° longitude), located approximately at 180° longitude. The IDL serves as the boundary for the change in date.