Gravitation — Science STD 9 — Question

State whether speed is a scalar or a vector quantity. Give reason for your choice.

State one instance where water undergoes a physical change and one in which it undergoes a chemical change.

Mixed cropping is done to reduce the _________ between component crops for _______, nutrients and water.

A car is moving along a straight road at a steady speed. It travels 150m in 5 seconds:
How long does it take to travel 240m?

Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.

‘A substance has a definite shape as well as a definite volume’. Which physical state is represented by this statement?

Name an animal which navigates and find food by echolocation.

Arrange the following substances in increasing order of force of attraction between their particles (keeping the substance having them in imum force of attraction first):
Water, Sugar, Oxygen