HEAT AND TEMPERATURE GRADE 7

Heat energy is ...

• the temperature of an object
• energy that transfers from high to low temperature
• the particles in a substance
• the number of particles in something

Thermal conductivity is 

• the same as R-value
• a measure of temperature
• the ability of a material to transfer heat by conduction
• an insulation rating

What can be done to ensure that the tracks do not become crooked like this? You may choose more than one answer.

• Expansion gap should be included between adjacent tracks.

• Rollers should be placed below the train tracks.

• A longer track should be used.

• Expansion bends should be included in the train track design

When bridges are built, special joints must be used because the material of the bridge expands, and without these joints, the material would break.   What is this referred to as?

• Thermal Expansion

• Thermal Contraction

• Thermal underwear

• None of these

When two things are the same temperature ___

• Their molecules stop moving.

• Their molecules move at the same speed.

• They have the same number of molecules.

• None of these

The decrease in the sizes of objects when they are cooled is called …………

• expansion

• contraction

The increase in the sizes of objects when they are hot is called ………………

• expansion

• contraction

When a solid is cooled, the atoms vibrate …………… vigorously and they become closer together.

• more

• less

Which of the following is an application of expansion and contraction of matter?

• Fixing telephone poles at regular intervals

• Fixing the grill at the top part of an oven

• Fixing hot water pipes in a curved layout

• Fixing a plastic handle on a cooking pot

A ______________ thermometer is used in scientific field.

• Laboratory

• Clinical

• Digital

• Mercury