Thermal Expansion Grade 8 ICSE

The Flow of energy that gives a sensation of warmth or cold.

(a)  

Measure of hotness or coldness of an object.

• Heat

• Temperature

• Thermal

• Thermal Expansion

C, K, and F are scales of (a)   .

The direction of flow of heat is always

• From a hot object to a cold object

• From a cold object to a hot object

• Upwards

• Downwards

The effects of heat on an object are/can be (mark all that apply)

• Change in velocity of molecules

• Change in state

• Change in temperature

• Change in Volume/size

• Change in composition (chemical change)

Which of these are forms of vaporisation? (mark all that apply)

• Boiling

• Evaporation

• Condensation

• Conduction

• Radiation

A change of state from liquid to gas is called:

• Evaporation

• Vaporisation

• Boiling

• Sublimation

Since the molecules with excess velocity escape the medium, this leads to a cooling of the ambient temperature. What are we talking about?

• Boiling

• Evaporation

Only the surface molecules participate in this process. There is no uniform application of an external heat source in this gradual process. We are talking about:

• Vaporisation

• Boiling

• Evaporation

Thermal expansion is highest in _______, followed by ____________ and finally _____________.

• Gases, Liquids, Solids

• Solids, Liquids, Gases

• Liquids, Solids, Gases

• Gases, Solids, Liquids