Matter in Our Surroundings — Science STD 9 — Question

State one condition necessary to liquefy gases (other than applying high pressure).

For proper storage of grains what is the ideal moisture content of grains?

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?

State the SI unit of acceleration due to gravity.

Name the most efficient converter of low fibre food stuff into highly nutritious animal protein food.

Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?

Name a metal which is liquid.

Give two reasons to justify—
An iron almirah is a solid at room temperature.