Classes
Class 9Class 10First YearSecond Year
$2.2 Fill in the blanks.(iii) Whale executing a simple harmonic motion the magnitude of the acceleration of the body is to its distance from the mean position and the direction of the acceleration is always towards the$

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.

$16.20 Discuss in detail the light emitting diodes?$

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

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

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

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