Subject :NSO Class : Class 6
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.
Ans 1:
Class : Class 6
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