CT TERM4 (Heat Transfer Ppt)

Question 1

What is conduction?

Answer 1

Conduction is the transfer of heat through a material without the movement of the material itself.

Question 2

True or False: Conduction occurs in liquids and gases.

Answer 2

False

Question 3

What is convection?

Answer 3

Convection is the transfer of heat by the movement of fluids (liquids or gases).

Question 4

What is radiation?

Answer 4

Radiation is the transfer of heat in the form of electromagnetic waves.

Question 5

Fill in the blank: ________ is a good conductor of heat.

Answer 5

Copper

Question 6

Fill in the blank: ________ is a poor conductor of heat.

Answer 6

Rubber

Question 7

What is a good conductor?

Answer 7

A good conductor is a material that allows heat to pass through it easily.

Question 8

What is a poor conductor?

Answer 8

A poor conductor is a material that does not allow heat to pass through it easily.

Question 9

True or False: Metals are generally good conductors.

Answer 9

True

Question 10

True or False: Insulators are materials that conduct heat well.

Answer 10

False

Question 11

What causes a sea breeze?

Answer 11

A sea breeze is caused by the temperature difference between land and water, where cooler air over the sea moves towards the warmer land.

Question 12

What causes a land breeze?

Answer 12

A land breeze occurs when the land cools faster than the sea, causing cooler air to move from the land to the sea.

Question 13

Fill in the blank: During the day, the land heats up ________ than the sea.

Answer 13

faster

Question 14

Fill in the blank: At night, the land cools down ________ than the sea.

Answer 14

faster

Question 15

What is the primary mechanism of heat transfer in conduction?

Answer 15

Molecular vibration and direct contact.

Question 16

Multiple choice: Which of the following is NOT a method of heat transfer? A) Conduction B) Convection C) Diffusion D) Radiation

Answer 16

C) Diffusion

Question 17

What is the role of density in convection?

Answer 17

Density differences cause fluid movement; warmer, less dense fluid rises while cooler, denser fluid sinks.

Question 18

True or False: Convection can occur in solids.

Answer 18

False

Question 19

What type of heat transfer occurs in a vacuum?

Answer 19

Radiation

Question 20

What is the primary factor that affects the rate of conduction?

Answer 20

The material’s thermal conductivity.

Question 21

Fill in the blank: ________ is an example of radiation heat transfer.

Answer 21

The heat from the Sun

Question 22

What is the difference between natural and forced convection?

Answer 22

Natural convection occurs due to density differences, while forced convection is caused by external forces like fans or pumps.

Question 23

True or False: Insulation materials are designed to be good conductors.

Answer 23

False

Question 24

What happens to air pressure during a sea breeze?

Answer 24

Air pressure over the land decreases as it heats up, while air pressure over the sea remains relatively higher.

Question 25

What is thermal conductivity?

Answer 25

Thermal conductivity is a measure of a material's ability to conduct heat.

Question 26

Multiple choice: Which material is a poor conductor of heat? A) Wood B) Aluminum C) Silver D) Copper

Answer 26

A) Wood

Question 27

What is the main source of energy for radiation?

Answer 27

The Sun

Question 28

Fill in the blank: ________ is the process by which heat is transferred through the movement of air.

Answer 28

Convection

Question 29

What is the effect of temperature on conduction?

Answer 29

Higher temperatures generally increase the rate of conduction.

Question 30

True or False: All materials can conduct heat.

Answer 30

True

Question 31

What is the term for the cooling effect experienced at night due to land breezes?

Answer 31

Land breeze effect