PHYSICS CH8 Sound — Science STD 9 — Question

A boy throws a ball up and catches it when the ball falls back. In which part of the motion the ball is accelerating?

Refractive index of a medium is …………………..

The term nucleons refer to ______.

A car is being driven at a speed of 20ms-1 when brakes are applied to bring it to rest in 5 s. The deceleration produced in this case will be

A solid floats in liquid with a portion of it being submerged. Then
(a) The liquid exerts an upthrust equal to weight of the solid
(b) The weight of the dispersed liquid is equal to the weight of solid
(c) Solid exerts a force equal to its weight on liquid

A homogeneous mixture of two or more substances is called

In the dental formula \frac{2,1,2}{2,1,2} refers to ……………………

……………..compounds are highly brittle.

Density Bottle is also called as

An internal factor responsible for spoilage of food is ______.