1. Heat is an energy transit that flows from _________________.
A. hot object to cold object C. hot object to hotter object
B. cold object to hot object D. cooler object to cool object
2. As the temperature of a substance increases, atoms and molecules move
_________________.
A. faster C. with medium speed
B. slower D. faster and then slower
3. What happens to the kinetic energy of atoms and molecules as the temperature
becomes lower?
A. increases C. decrease and then increase
B. decreases D. increases and then decreases
4. A security guard in a mall scanned the temperature of a girl using an infrared
thermometer. The registered temperature is 101 0F. If the normal body temperature
is below 37.50C, what does it show?
A. She has a fever. Her temperature is 38.3 0C.
B.She has a fever. Her temperature is 37.3 0C.
C.She does not have a fever. Her temperature is 38.3 0C.
D.She does not have a fever. Her temperature is 37.4 0C.
5. Which of the following statements is NOT true about heat?
A. Heat is expressed in terms of Joules or calories.
B.Heat is the average movement of molecules in a substance.
C. Heat pertains to the energy transferred when there is a difference in the
temperature of two bodies.
D.Heat is an energy that flows from substances with fast-moving molecules to other
substances with slow-moving molecules.
6. Which of the following is NOT an effect of heat?
A. The lowering of temperature
B. The rusting of the metal plate of a car
C. The increasing size of the metal gate
D.The subliming of naphthalene balls after some time.
Posttest
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7. Which of the following requires heat loss to change the phase of an object?
A. Boiling of water C. Subliming of dry ice
B. Melting of butter D. Freezing an ice cream
8. When Linda was about to eat her soup, the online delivery arrives. She had to attend
to the delivery and left her food on the table for quite some time. What will most
likely happen to the temperature of her soup?
A. Nothing will happen because the temperature remains the same.
B. The food will become hotter as she lets her food expose to cooler surroundings.
C. The food will become colder than before and will meet thermal equilibrium with
the surroundings.
D. There are not enough details to answer this question.
9. In terms of temperature effects, why do we need to close the door of an airconditioned room?
A. The air inside the room might rush outside if the door is open.
B. The air outside the room might worsen the quality of the air inside.
C. The warm air inside the room might sink and the cooler air rises.
D. The air outside the room might increase the temperature of the cooler air inside
the room.
10. Which of the following will most likely happen if water in its liquid phase is boiled
at a very high temperature in several minutes?
A. The temperature will rise only.
B. The temperature will rise, and it will expand.
C. The temperature will rise, the water molecules will move faster, and it will change
into a gaseous state.
D. The temperature will rise, the water will expand, it will change into a gaseous
state, and, it will become colorless.
11. The boiling point of water on the Celsius scale is 100 0C. What is its equivalent in
the Kelvin scale?
A.0 K B. 2.73 K C. 173.15 K D. 373.15 K
12. The specific heat is defined as the quantity of heat required to change the
temperature of a unit mass of the substance by a Celsius degree. Which unit is
NOT for specific heat?
A.
⁄ ∙ ℃ B.
⁄
∙ ℃ C.
∙
⁄ D.
∙
⁄
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13. Which of the materials listed below has the highest specific heat?
A. Lead B. Metal C. Water D. Silver
14. How much heat is needed to melt 0.25 kg butter in a pan from 2 0C to 40 0C?
(specific heat of butter is 2.04 kJ/ kg °C).
A.1.94 kJ B. 19. 38 kJ C. 193.8 kJ D. 1938 kJ
15. How much is the change in temperature of 2 kg aluminum can if 3000 J of heat is
applied to it? (Note: specific heat capacity of aluminum is 921.096 J/kg0C)
A. -1157.81 C0 B. 1157.81 C0 C. 0.61 C0 D. 1.63 C0