Sec 2NA Science Revision 2

Kelvin is the SI unit for

• Temperature

• Magnetism

• Force

• Power

Heat is transferred from the

• Hotter object to the colder object

• Colder object to the hotter object

When ice is added to lemon tea,

• The ice melts because heat is transferred from the tea to the ice

• The ice becomes colder because it loses heat to the tea

• The tea becomes colder because ice transfered coldness to the tea

• There is no heat transfer at all

During hot weather, gaps between railway tracks is to provide space for

• Track expansion

• Track contraction

• Accumulation of dirt

• Magnetic repulsion

Which of the following is NOT a result of global warming?

• Carbon monoxide poisoning

• Rising sea levels

• Flooding of low land areas

• Melting of polar ice caps

Metal water pipes are built with flexible bends so that they

• contain more water

• expand and contract safely without breaking

• do not rust easily

• deliver water more efficiently

A bimetallic strip in an iron contains 2 different metals that

• Expand and contracts at different rates

• Are unaffected by heat

• Are more malleable

• Less resistant to corrosion

The mercury thermometer shows an increase in temperature when

• Mercury absorbs heat and expands

• Mercury releases heat and contracts

• Mercury absorbs heat and contracts

• Mercury releases heat and expands

Density is

• Mass divided by volume

• Mass times volume

• Mass plus volume

• Volume divided by mass

The hot air balloon rises when air in the balloon is

• Heated and becomes less dense

• Heated and becomes more dense

• Cooled and becomes less dense

• Cooled and becomes more dense