Question

What's common among motion of the planets around the sun, blinking of traffic lights and motion of blades of a fan rotating at uniform speed?

• A. Irreversible changes
• B. Chemical changes
• C. Periodic changes
• D. Undesired changes

Answer 1

Answer: (C)

Periodic changes

Common among motion of the planets around the sun, blinking of traffic lights and motion of blades of a fan rotating at uniform speed all are repeated at a fixed time hence all are an example of periodic change.