Pre Test Heat Transfer

Which of the following always moves from hotter to colder object?

• A. Heat

• B. Light

• C. Sound

• D. Temperature

What is needed for heat to transfer from one object to another? The two

objects should __________

• A. have an equal temperature.

• B. have different temperatures.

• C. always be in contact for heat to travel through.

• D. always be inside a vacuum or empty space for heat to travel through.

A small cup of cold milk is being poured into a big mug half-filled with hot coffee. Which is true about heat transfer in this situation?

• A. Cold milk transfers heat to the hot coffee.

• B. Hot coffee transfers heat to the cold milk.

• C. Both liquids absorb heat from each other.

• D. Heat will not transfer to either of the liquids.

What will eventually happen if you leave a bowl of hot soup for an hour on top of the table in your room?

• A. The soup will become colder than the room.

• B. The room will become hotter than the hot soup.

• C. Heat from the room will transfer to the hot soup.

• D. Hot soup will eventually cool down to room temperature.

Which of the following processes involves heat transfer by direct contact between objects?

• A. Conduction

• B. Convection

• C. Emission

• D. Radiation

Which material is best to be used as a kettle pot handle to keep your hand from being burned when holding it while cooking?

• A. Copper

• B. Plastic

• C. Steel

• D. Wood

Which method of heat transfer makes the entire pot of water boil over the hot stove?

• A. Conduction

• B. Convection

• C. Evaporation

• D. Radiation

Which is the correct sequence of events as convection current occurs in boiling water in a pot placed over a hot stove?

i. Bottom part of the pot conducts heat to the water.

ii. The cool, denser water on top will sink.

iii. Heated water at the bottom becomes less dense then rise.

iv. Hot stove conducts heat to the bottom of the pot.

• A. i, ii, iii, iv

• B. iii, iv, ii, i

• C. iv, i, iii, ii

• D. ii, iii, I, iv

Which is true about heat transfer by radiation?

• A. Heat moves through waves.

• B. Heat cannot transfer without matter.

• C. Direct contact by touching is needed for heat to transfer.

• D. Actual movement of matter is needed for heat to transfer.

How does heat transfer from the sun to the earth? Heat transfers by

• A. Conduction

• B. Convection

• C. Evaporation

• D. Radiation