Why Do we Fall Ill — Science STD 9 — Question

Give one example where: A force changes the direction of a moving body.

Name one non-metal which is liquid.

Name two exotic varieties of cow.

Name the unit used to measure the loudness of sound. Also write its symbol.

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

Name the physical state of matter which can be easily compressed.

Which of the following are not compounds? Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond.

Define the following terms: Boiling

How many atoms are present in one gram atomic mass of a substance?

Give two examples of solids which sublimes.