Effects of Heat

The liquid (Mercury ) rises in thermometer if, kept in hot water bath because

• Liquid expands on heating

• Liquid contracts on heating

• Mercury moves if its disturbed

The balloon increases in size because

• The air inside the balloon expands on heating

• The air increases its weight on heating

Gases expand more________ than liquids

When particles absorb heat their ____________ energy increases

• Kinetic Energy

• Potential Energy

Conduction of heat takes place only in .................

• Solids

• Liquids

• Gases

• Air

_____ expand the least on heating and _______ the most.

• liquid, solid

• solid, liquid

• solid, gas

• gas, solid

Three forms for energy to travel:

• Conduction, melting and radiation

• insulator, conductor and radiator

• Conduction, convention, radiation

• Convection, radiation and temperature

A bimetallic strip is made up of _____________________ welded together.

• two metals of the same kind 
• two different metals that expand and contract unequally
• two different metals that expand and contract equally

Which metal, A or B, expands the most upon heating? And what metal is it?

• A; Iron
• A; Brass
• B; Iron
• B; Brass

The picture shows a bimetallic strip in a fire alarm. When there is a fire outbreak, the bimetallic strip will get hot, ....

• bend downwards, complete the circuit and the alarm rings.

• bend upwards, open the circuit and the alarm will not ring.

• becomes longer, open the circuit and the alarm will not ring.