What is common among the following phenomena? 1. Blinking of traffic l – McqOptions

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1.	What is common among the following phenomena? 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.
Answer» C. All are undesirable changes.

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