Bennett Mechanical Test Thermodynamics and Heat 3

Question 1

Water boils at a lower temperature on top of a high mountain because:

Accepted Answer

Air pressure is lower at high altitude

Answer

Air is colder at high altitude

Answer

There is less oxygen

Answer

Water is purer at altitude

Question 2

A thermos keeps drinks hot mainly by reducing which type of heat transfer with its vacuum layer?

Accepted Answer

Conduction and convection

Answer

Radiation only

Answer

Combustion

Answer

Evaporation only

Question 3

What is the change of a substance directly from solid to gas without becoming liquid called?

Accepted Answer

Sublimation

Answer

Condensation

Answer

Evaporation

Answer

Freezing

Question 4

Two identical pots of water are heated, one covered with a lid. Which boils faster?

Accepted Answer

The covered pot

Answer

The uncovered pot

Answer

Both boil at the same time

Answer

Neither will boil

Question 5

Which material would make the best insulator to keep a house warm?

Accepted Answer

Fiberglass batting

Answer

Copper sheeting

Answer

Aluminum foil layers alone

Answer

Solid steel panels

Question 6

When you rub your hands together quickly, they get warm because:

Accepted Answer

Friction converts mechanical energy into heat

Answer

Your blood pressure rises

Answer

The air cools your skin

Answer

Static electricity heats the skin

Question 7

Heat always flows naturally from:

Accepted Answer

A hotter object to a cooler object

Answer

A cooler object to a hotter object

Answer

Larger objects to smaller objects

Answer

Lighter objects to heavier objects