Bennett Mechanical Test Thermodynamics and Heat 4

Question 1

A car radiator uses circulating coolant to remove engine heat. This is primarily an example of:

Accepted Answer

Convection

Answer

Radiation

Answer

Sublimation

Answer

Insulation

Question 2

Why are cooking pot handles often made of plastic or wood instead of metal?

Accepted Answer

They are poor conductors and stay cooler

Answer

They are stronger than metal

Answer

They look more attractive

Answer

They conduct heat faster for safety

Question 3

If you add the same amount of heat to equal masses of water and iron, which heats up to a higher temperature?

Accepted Answer

Iron, because it has a lower specific heat

Answer

Water, because it has a lower specific heat

Answer

Both reach the same temperature

Answer

Neither changes temperature

Question 4

Steam can cause worse burns than boiling water at the same temperature because:

Accepted Answer

Steam releases extra latent heat when it condenses on skin

Answer

Steam is hotter than boiling water

Answer

Steam moves faster than water

Answer

Steam is electrically charged

Question 5

A bimetallic strip in a thermostat bends when heated because:

Accepted Answer

The two metals expand by different amounts

Answer

One metal melts before the other

Answer

The metals become magnetic

Answer

Heat shrinks one of the metals

Question 6

Sweating cools the body mainly through:

Accepted Answer

Evaporation absorbing heat from the skin

Answer

Conduction into the air

Answer

Radiation from the skin

Answer

Convection of blood

Question 7

At what temperature does pure water freeze at standard atmospheric pressure?

Accepted Answer

32°F (0°C)

Answer

0°F (-18°C)

Answer

100°F (38°C)

Answer

212°F (100°C)