Improvement in Food Resources — Science STD 9 — Question

What is the nucleus of an atom and what is the nature of charge on it?

Give the formulae of the compounds formed from the following set of element:
Carbon and hydrogen.

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?

Which of the following travels slowest in air and which one fastest?
Supersonic aircraft, Light, Sound.

Out of solids, liquids and gases, which one has:
Minimum spaces between particles?

Name the device which is used to produce sound in laboratory experiments.

Give examples in which matter is present in the plasma state.

Differentiate between the following:
Bee keeping and Poultry farming.

Name an animal which navigates and find food by echolocation.