Structure of the Atom — Science STD 9 — Question

When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?

What conclusion is obtained from the fact that all the gases form cathode rays?

How much work is done when a force of 1N moves a body through a distance of 1m in its own direction?

Write the SI unit of the both distance and displacement.

All the gases form cathode rays and anode rays when electricity is passed through them:
What does the formation of cathode rays tell us about the atoms?

The common biofertilisers used in organic farming are:

1. Marfosa.
2. Pyrethrum.
3. Green manure.
4. Nitrogen-fixing bacteria and cyanobacteria.

Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.

What is the numerical value of Avogadro number?

Name one element, one compound and one mixture.