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Class 9Class 10First YearSecond Year
##### i. Which of the following is an example of simple harmonic motion?(a) the motion of simple pendulum(b) the motion of ceiling fan(c) the spinning of the Earth on its axis(d) a bouncing ball on a floor

2.2 Fill in the blanks.(vii) Longitudinal waves consist of ___ and and as they pass through a medium the particles of the medium vibrates in the of the waves.

16.20 Discuss in detail the light emitting diodes?

Hole is equivalent to:A) A neutral particleB) A positive chargeC) A negative chargeD) An electron

10.4. A simple pendulum completes one vibration in two seconds. Calculate its length when g=10.0 \mathrm{~ms}^{-2} .Ans. (1.02 m)

10.1. If the length of a simple pendulum is doubled what will be the change in its time period?

2.4 Pick out true and false.(iv) Force applied to a spring is inversely proportional to the extension in the spring.