G1 Sci Heat (5.3 How does expansion and contraction affect us?)

When an object is heated, it will ___________________ and ______________________ .

• lose heat / expand

• lose heat / contract

• gain heat / expand

• gain heat / contract

Solid contracts more than liquid when cooled by the same amount.

• True

• False

Gas expands more than liquid when heated by the same amount.

• True

• False

The small gaps between tracks of train enable the tracks to ______________ during a hot day and prevents any damage.

• contract

• expand

• longer

• shorter

Why there are gaps between metal connectors on bridge?

• To allow water flow through it rainy season

• To allow air flow during thunderstorm

• To allow the bridge to expand when the temperature of the surrounding increases

Why do overhead cables need to be installed with extra length?

• It does not snap when it contracts during cold weather.

• It does not snap when it expands during cold weather.

• It does not snap when it contracts during hot weather.

• It does not snap when it expands during hot weather.

Riveting is a method to _____ two pieces of metal tightly together.

A bimetallic strip consists of two strips of ______ metals joined together and the metals expands to ______ lengths when heated.

The diagram shows a bimetallic strip when it is heated.

Which metal 1 or 2 expands more when heated?

• metal 1

• metal 2

Which of the following electrical appliances contains a thermostat?

• hairdryer

• television

• refrigerator

• blender