| 1. Blinking of traffic lights. |
| 2. Rotation of blades of a fan. |
| 3. Swinging of pendulum of a clock. |
A) All are chemical changes.
B) All are periodic changes.
C) All are undesirable changes.
D) All are irreversible changes.
Correct Answer: B
Solution :
All these changes occur again and again after fixed intervals of time, hence are periodic changes.
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