Effects of Heat Basics

What happens to particles of air when heated?

• Particles move faster and expand

• Particles move slower and the air expands

• Particles move faster and become closer together

• Particles move faster and become further apart

When cooled, the mass of an object ...

• decreases.

• increases.

• remains constant.

When cooled, object's....

• volume increases and density increases

• volume decreases and density decreases

• volume increases and density decreases

• volume decreases and density increases

Thermal expansion occurs when particles of matter move farther apart as temperature decreases.

• True

• False

The liquid in the thermometer rises when it is placed in the hot water because ___________.

• it gains heat from the hot water and expands.

• loses heat from the hot water and contracts.

• the surrounding air is too warm.

• •the liquid is boiling.

Which of the following is thermal expansion the least noticeable at room temperature?

• nitrogen

• steel

• water

• fluorine

How are overhead electrical wire lines installed?

• They are installed tightly to save costs

• They are installed loosely to give allowance for expansion

• They are installed tightly to give allowances for contraction

• They are installed loosely to give allowances for contraction

A wooden wheel can be strengthened by putting a tight circle of iron around it.

Which action would make it easier to fit the circle over the wood?

• Cooling the iron circle

• Heating the wooden wheel but not heating or cooling the iron circle

• Heating the wooden wheel and cooling the iron circle

• Heating the iron circle

The diagram below shows an equipment used to measure temperature. The height of the mercury level ‘h’ indicates the temperature.

The flask is filled with gas instead of water because

• gas contracts less than water when cooled.

• gas expands more than water when heated.

• gas has a smaller density than water.

• gas is a poorer conductor of heat than water.