Air Around Us — Science STD 6 — Question

Which device is used to detect directio0n at an unknown place?

What does wind help spread?

To clean their spectacles, people often breathe out on glasses to make them wet. Explain why the glasses become wet.

The proportion of which gas is highest in air?

Why would you not like to use a measuring tape made of an elastic material like rubber to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with such a tape?

Name four pulses, that we eat.

List all items known to you that float on water. Check and see if they will float on oil or kerosene.

(State evaporation or condensation) Blackboard dries up after wiping it.

What is the process of conversion of water vapour into water on cooling known as?