Question

name: estuella v/9 - 30 - 25/8cj.g
heat transfer unit test

1. what is thermal energy?

a. energy created when atoms vibrate and bump into each other
b. materials that block the movement of heat
c. a current created when hot matter rises, cools, and sinks

1. heat is the movement of

a. atoms
b. thermal energy
c. sunlight

1. heat always moves from

a. hot to cold
b. cold to hot
c. big to small

1. what are the three types of heat transfer?

a. insulator, conductor, and radiator
b. radiation, conduction, and current
c. radiation, conduction, and convection

1. boiling water moving in a circular motion is an example of

a. radiation
b. conduction
c. convection

1. the sun heating up the sand at the beach is an example of

a. radiation
b. conduction
c. convection

1. burning your hand by touching a hot pot is an example of

a. radiation
b. conduction
c. convection

Explanation:

1. Thermal energy is the energy of moving or vibrating atoms. Option A is correct as it describes this concept.
2. Heat is the transfer of thermal energy. So option B is right.
3. Heat naturally flows from hot to cold regions according to the second - law of thermodynamics. Option A is correct.
4. The three main types of heat transfer are radiation, conduction, and convection. Option C is correct.
5. Boiling water moving in a circular motion is a classic example of convection currents. Option C is correct.
6. The sun heating the sand is an example of heat transfer by radiation as it occurs through electromagnetic waves. Option A is correct.
7. Burning your hand by touching a hot pot is conduction as heat is transferred through direct contact. Option B is correct.

Answer:

1. A. energy created when atoms vibrate and bump into each other
2. B. thermal energy
3. A. hot to cold
4. C. radiation, conduction, and convection
5. C. convection
6. A. radiation
7. B. conduction