Class 9 Science - Matter in Our Surroundings

Which of the following is not a characteristic of particles of matter?

• They have space between them

• They are not constantly moving

• They attract each other

• They are very small

The smell of perfume spreads due to:

• Osmosis

• Diffusion

• Evaporation

• Sublimation

The rate of diffusion is highest in:

• Solids

• Liquids

• Gases

• Plasma

Which of the following is a compressible state of matter?

• Solid

• Liquid

• Gas

• All of these

The phenomenon of change of a liquid into vapour at any temperature is:

• Boiling

• Freezing

• Evaporation

• Condensation

The boiling point of water is:

• 0°C

• 50°C

• 100°C

• 212°C

The SI unit of temperature is:

• Celsius

• Fahrenheit

• Kelvin

• Degree

Solid CO₂ is also known as:

• Dry gas

• Wet ice

• Dry ice

• Solid air

Which state of matter has a fixed shape and volume?

• Solid

• Liquid

• Gas

• Plasma

Which state of matter has neither fixed shape nor fixed volume?

• Solid

• Liquid

• Gas

• None