Matter in Our Surroundings — Science STD 9 — Question

What is meant by the concentration of a solution?

Name the three characteristic of sound.

Out of solids, liquids and gases:
In which medium sound travels fastest?

Name the property of one of the constituents which can be used to separate a mixture of salt and iodine.

Name the nerve which carries electrical impulses from the cochlea of ear to the brain.

Name the scientist who gave he magnitude of buoyant force acting on a solid object immersed in a liquid.

What is the other name of buoyant force?

Name the device which converts electrical energy into mechanical energy.

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

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