brodidit for students
Home / Practice / Class 9 / Chemistry / Physical states of matter
Physical states of matter
6 Class 9 Chemistry questions with answers and explanations.
Printable worksheet with answer key
-
Which state of matter has a fixed shape and a fixed volume?
- 1 Gas
- 2 Solid
- 3 Liquid
- 4 Plasma
Show answer
Correct answer: Solid
Particles in a solid are held in fixed positions.
-
The change of a solid directly into a gas is called:
- 1 Condensation
- 2 Sublimation
- 3 Melting
- 4 Freezing
Show answer
Correct answer: Sublimation
Sublimation is solid to gas without passing through the liquid state.
-
At the same temperature, which gas diffuses the fastest?
- 1 Carbon dioxide
- 2 Oxygen
- 3 Hydrogen
- 4 Chlorine
Show answer
Correct answer: Hydrogen
Lighter molecules move faster. Hydrogen is the lightest.
-
Boyle's law says that at constant temperature the volume of a gas is inversely proportional to its:
- 1 Pressure
- 2 Colour
- 3 Mass
- 4 Density only
-
Evaporation takes place:
- 1 Only in a vacuum
- 2 At any temperature, from the surface
- 3 Only at the boiling point
- 4 Only in solids
Show answer
Correct answer: At any temperature, from the surface
Evaporation happens at the surface of a liquid at any temperature.
-
A gas at 2 atm pressure has a volume of 4 L. At constant temperature, what is the volume at 4 atm?
- 1 4 L
- 2 2 L
- 3 8 L
- 4 1 L