Understanding Devices and Systems That Use Heat

Infrared technology picks up _____________.

• Sound waves

• Light waves

• Heat

• Radio waves

Which technology is better for detecting heat signatures?

• Night vision goggles

• Infrared technology

• Regular cameras

• Microphones

Why would a photo taken of your house in infrared be useful to you?

• It shows the color of the house

• It helps in identifying heat loss

• It measures the size of the house

• It shows the age of the house.

What is the main principle behind refrigeration?

• Addition of cold

• Movement of heat

• Freezing air

• Compressing air.

Fill in the blank: It is always about the movement of ________, not the addition of cold!

• A) Heat

• B) Cold

• C) Air

• D) Water

How does a refrigerator work?

• By adding cold air

• By removing heat

• By freezing the air

• By compressing air.

Fill in the blank: An air conditioning system is designed to ______ the air in a room.

• A) heat

• B) cool

• C) circulate

• D) filter

Most technologies that are used to lower the temperature of something use a _________________.

• Heater

• Refrigerant

• Conductor

• Insulator

What is the role of the liquid in cold technologies?

• A) It absorbs and releases heat as it changes between a liquid and a gas.

• B) It only absorbs heat.

• C) It only releases heat.

• D) It remains constant.

What is the primary function of a thermometer?

• Measure temperature

• Measure pressure

• Measure humidity

• Measure speed