CLASS 8 CH-1 MATTER

Which of the following is not a property of matter in a gaseous state?

• definite volume

• non-rigid

• flow in all directions

• highly compressible

During the change of state, the temperature

• increases

• decreases

• remains constant

• first increases and then decreases

The fixed temperature at which a liquid changes into its solid state is called its

• melting point

• freezing point

• boiling point

• condensation point

On rejecting heat from a substance, the kinetic energy of its molecules.

• Increases

• Decreases

• remains same

• none of the above

The boiling point of seawater is 100.8 degree celsius. Its condensation point will

• decrease

• increase

• first increase then decrease

• remain same

Naphthalene shows the property of sublimation because

• it has strong intermolecular forces

• it has weak intermolecular forces

• it has high rigidity

• it has the least intermolecular spaces

Identify the process.

• Melting

• Freezing

• Boiling

• Condensation

You have a chocolate bar with you. You forgot to keep it in the fridge and saw that the chocolate has melted. Which of the following property will be the same in the molten chocolate and the chocolate bar?

• Shape

• Compressibility

• Hardness

• Mass

Find the correct sequence

• Melting, Freezing, Liquefaction, Boiling, deposition, sublimation

• Fusion, Freezing, Sublimation, Deposition, Boiling, Condensation

• Fusion, Freezing, Sublimation, Deposition, Condensation, Boiling

• Melting, Freezing, Sublimation, Deposition, Boiling, Condensation

Which of the following is most likely to occur when a solid is heated?

• both intermolecular space and intermolecular force will increase

• both intermolecular space and intermolecular force will decrease

• intermolecular space increases while intermolecular force decreases

• intermolecular space decreases while intermolecular force increases