Heat Transfer Quiz

Question 1

Some people say that heat transfer always occurs from “where it is to where it ain’t.” What does this really mean?

Answer 1

The heat will move and cold air won’t; heat transfer occurs from places where there is a higher temperature to places where there is a lower temperature

Question 2

Some things slow down the rate of heat transfer. Can you name some?

Answer 2

Wool and Paper

Question 3

Which is better at slowing down the rate of heat transfer, a wool sock or a cotton sock?

Answer 3

Wool

Question 4

Could there be any sources of error measuring the can temperatures? How could we find out?

Answer 4

While measuring it, heat could get in

Question 5

Why do people wear wool in the winter, and cotton in the summer?

Answer 5

Cotton is thin and lets heat travel through it easily while cotton is thicker and its fibers are different, this helps it traps heat in and keep them warm

Question 6

What does heat transfer have to do with penguins?

Answer 6

Because the penguins are adapted to cold environments and their and homes need to stay cool

Question 7

Why do you think the silver spoon made the ice melt more quickly?

Answer 7

the heat transfers from your hand to the spoon to the ice cube

Question 8

Would a penguin shaped ice cube last longer sitting on a metal surface or a plastic surface? Why?

Answer 8

Plastic, because it would transfer less heat energy to it

Question 9

If you had a more powerful microscope, what do you think you would see when heat transfers from your hand to the ice cube?

Answer 9

All of the heat rushing to the ice cube

Question 10

If heat is not a substance or fluid, as people used to think, what is it?

Answer 10

energy; can circulate in any direction

Question 11

Why do dark colors (dark cars, parking lots, roofs) get so hot in the sun? Why do light colors (light cars, sidewalks, roofs) stay cooler in the sun?

Answer 11

Black colors absorb more heat while light colors absorb less and thus stay cooler

Question 12

How does the heat get from the sun to Earth?

Answer 12

Radiation waves

Question 13

Does the Earth reflect radiation? If so, which parts reflect the most radiation?

Answer 13

The Earth reflects it a little bit, the part that would reflect the most would probably bet the oceans/lakes, because water has some reflective properties

Question 14

On a hot day, the upstairs rooms in a house are usually hotter than the downstairs rooms.

Answer 14

Warm air rises and cool air sinks.

Question 15

In a swimming pool, the water near the surface is slightly warmer. The warm water rises because of

Answer 15

Convection

Question 16

A student holds the back of his hand near an iron to see if it is hot. Heat is transferred to his hand by ________________.

Answer 16

Conduction

Question 17

Why do we wear sweaters in cold weather?

Answer 17

To reduce heat loss.

Question 18

A house burns down. On the house across the street, all of the vinyl siding is twisted and warped by the heat. The heat was transferred across the street by _________________.

Answer 18

Radiation

Question 19

Scientifically, the most accurate definition of the temperature of a substance is

Answer 19

measure of average kinetic energy of the molecules in that substance

Question 20

The metal skewer gets so hot that you drop your marshmallow in the campfire because of

Answer 20

Conduction

Question 21

If you put a metal spoon and a wooden spoon into a pot of boiling water, one will become too hot to touch. Why?

Answer 21

Metals conduct heat better than wood.

Question 22

You pick up a can of soda off of the countertop. The countertop underneath the can feels colder than the rest of the counter. Which explanation do you think is the best?

Answer 22

Some heat has been transferred from the counter to the soda.

Question 23

You have a can of soda in your lunchbox that you want to keep cold. Which material will work best to keep it cold?

Answer 23

Your wool sweater wrapped around the soda because wool traps air.

Question 24

An aluminum plate and a plastic plate have been in the freezer all night long. When you remove them the next morning,

Answer 24

The plastic plate has a higher temperature.

Question 25

When a metal spoon with a temperature of 20°C is placed into a cup of water with a temperature of 90°C the spoon will heat up. This is an example of:

Answer 25

Conduction

Question 26

On a warm sunny day, you will feel cooler wearing light colored clothes because they

Answer 26

reflect more radiation.

Question 27

During a house fire, the smoke and flames rise up, but the air near the floor is cooler and less smoky. This is an example of:

Answer 27

Convection

Question 28

Why does hot air rise?

Answer 28

Cooler air sinks due to gravity/denser molecules