Heat Transfer: Convection

Which of the following household chores involves convection of heat?

• Ironing rumpled clothes

• Boiling water for the coffee

• Frying egg for breakfast

• Drying clothes in the clothes line

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.

• i, ii, iii, iv

• iii, iv, ii, i

• iv, i, iii, ii

• i, iii, I, iv

Which one is a benefit of heat transfer by convection?

• It gives energy for plants to grow

• It causes smoke to rise

• It makes frying of food possible

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

• Heat

• Light

• Sound

• Temperature

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

• have equal temperature

• have different temperature

• always be in contact for heat to travel through

• 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?

• Cold milk transfers heat to the hot coffee

• Hot coffee transfers heat to the cold milk

• Both liquids absorb heat from each other

• 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?

• The soup will become colder than the room

• The room will become hotter than the hot soup

• Heat from the room will transfer to the hot soup

• Hot soup will eventually cool down to room temperature

Which of the following heat transfer is characterized by the movement of liquids or gases?

• Conduction

• Convection

• Radiation

• Sana all

In which of the following can convection current occur?

• Wood

• Water

• Roof

• Rubber

Your house is burning and you notice that the smoke and flame rise, but near the floor is colder and less smoky; that’s why you crawl and manage to get out from your house safely. This observation is an example of what method of heat transfer?

• Conduction

• Radiation

• Convection

• Injection