Question

Which of the following statements is correct?

• A. Motion is an absolute.
• B. We can use occurrence of lightning or thunder to measure time interval.
• C. The Sun is at rest.
• D. All statements are incorrect

Answer 1

The correct option is D All statements are incorrect

Motion is not absolute. Rest and motion are always specified with respect to a frame of reference. Hence, rest, motion, velocity etc are relative to the observer and not absolute.
The occurrence of lightning and thunder are not periodic phenomena. Therefore, they cannot be used to measure time.
Nothing in the universe is absolutely at rest. The Sun is in motion with respect to observers on earth.