Improvement in Food Resources — Science STD 9 — Question

Which ancient Indian philosopher suggested that all matter is composed of very small particles? What name was given by him to these particles?

Write any two observations which support the fact that atoms are divisible.

Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.

Give reasons:
A gas exerts pressure on the walls of the container.

Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.

What are inert elements? Why are they called so?

Classify each of the following as a homogeneous or heterogeneous mixture.
soda water, wood, air, soil, vinegar, filtered tea.