Direction: Read the questions carefully and encircle the letter of the correct answer.
1. Gases are poor conductors of energy because
A. there are wide spaces between gas particles that prevent them from colliding frequently
B. their particles are too small
C. their particles move fast
D. their particles tend to trap energy
2. Which of the following explains convection?
A. warm air rising
C. denser air settling down
B. cool air replacing warm air
D. all of the above
3. Which of the following is NOT true?
A. Aluminum is a good conductors of heat.
B. Infrared and ultraviolet rays are radiations emitted by the sun.
C. Convection takes place in solids, liquids and gases
D. Radiations travel through empty space.
4. Which one is a benefit of heat transfer by convection?
A. It cools down hot coffee.
B. It gives energy for plants to grow.
C. It causes smoke to rise.
D. It makes frying of food possible.
5. Which is an example of conduction?
A. You feel the steam rising from a cup of hot coffee.
B. Water on pot boils.
C. You feel the heat from the hot cup when you touch it.
D. You feel warm as you stand in front of a bonfire.
6. Which of the following processes involves heat transfer by direct contact between objects?
A. Conduction B. Convection C. Emission
D. Radiation
7. Which material is best to be used as kettle pot handle to keep your hand from being burned when
holding it while cooking?
A. Copper
B. Plastic
C. Steel
D. Wood
8. Which of the following situations happen because of convection
A. Heat from the sand felt by a person walking on the beach.
B. Heat from the sun felt by a person lying on the beach.
C. Sea breeze felt by a person sitting by the beach.
D. Clouds forming over the beach.
9. Cooking utensils are provided with wooden handle
A. because wood is cheaper than steel.
B. because wood is light and easy to handle.
C. because wood is poor conductor of heat.
D. to make the cooking utensils more attractive.
10. When cooking you feel hot standing before the stove. The heat from the stove is transferred by
A. convection B. conduction C. radiation D. all of the above.
11. Which method of energy transfer involves the movement of heated part of the liquid?
A, conduction
C. radiation
B. convection
D. all of the above
12. The energy that includes radio waves, x-rays and infrared rays.
A. radiation
C. conduction
B. electromagnetic energy
D. convection
13. The materials which cannot conduct heat.
A. conductors
C. Insulators
B. conduction
D. radiation
14. it is the transfer of energy from molecule to molecule.
A. Conduction
C. Radiation
B. Convection
D. none of the above
15. Which of the following is an example of convection?
A. Holding a hot water bottle
C. Boiling water for a hot bath
D. Drying of wet rug in clothes line
B. Stepping on a cold tile floor​