Bennett Mechanical Test Thermodynamics and Heat 2

Question 1

A metal spoon and a wooden spoon are left in the same hot soup. Why does the metal spoon feel hotter to the touch sooner?

Accepted Answer

Metal conducts heat faster than wood

Answer

Metals are good thermal conductors, so heat travels through them quickly to your hand.

Question 2

What happens to most metals when they are heated?

Accepted Answer

They expand

Answer

Heating causes the particles in most metals to move more and the material to expand.

Question 3

Heat moving through empty space from the Sun to Earth is an example of which method of heat transfer?

Accepted Answer

Radiation

Answer

Radiation transfers heat as electromagnetic waves and needs no medium.

Question 4

Why does warm air rise above a heater?

Accepted Answer

Warm air is less dense than cool air

Answer

Heated air expands, becomes less dense, and is pushed up by surrounding cooler air.

Question 5

Which surface color absorbs the most radiant heat?

Accepted Answer

Black

Answer

Dark, dull surfaces absorb the most radiant heat while light, shiny ones reflect it.

Bennett Mechanical Test Practice Test