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Quiz Chapter 9: Heat

10 questions · Form 2 Science Bab 9: Heat

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. Why are petroleum oil storage tanks painted with reflective white or silver paint?

  1. To absorb heat faster from ambient air
  2. To reflect thermal radiation and reduce temperature buildup inside the tank
  3. To prevent rust formation caused by rain
  4. To improve visibility for night aircraft
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Answer: B

White/silver surfaces reflect solar radiation, keeping the interior cooler and minimizing fuel vaporization risks.

2. Which material is the best thermal conductor suitable for making the base of a frying pan?

  1. Bakelite plastic
  2. Wood
  3. Copper
  4. Styrofoam
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Answer: C

Copper is a metallic conductor with high thermal conductivity, transferring heat quickly from burner flame to food.

3. A metal ring is tight around a wooden cylinder and cannot be removed. What thermal technique will loosen the metal ring easily?

  1. Heating the metal ring so it expands
  2. Cooling the metal ring with ice so it contracts
  3. Heating both together in hot oil
  4. Applying pressure to compress the ring
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Answer: A

Heating the metal ring causes thermal expansion, increasing its inner diameter so it slips off the wooden cylinder easily.

4. Which surface characteristics make an object the BEST absorber and radiation emission source of heat?

  1. White and smooth
  2. Dark, dull, and rough
  3. Shiny and silver
  4. Transparent and polished
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Answer: B

Dark, dull, and rough surfaces absorb radiant thermal energy most efficiently and emit thermal radiation fastest.

5. What thermal phenomenon explains why cold air sinks from an overhead air conditioner unit to cool a warm bedroom?

  1. Conduction
  2. Convection current
  3. Thermal radiation
  4. Sublimation
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Answer: B

Air cooled by the unit contracts and becomes denser, sinking downward while warmer, less dense room air rises to be cooled.

6. How do convection currents transfer heat through liquids and gases?

  1. Hotter, less dense fluid rises while cooler, denser fluid sinks
  2. Cooler, less dense fluid rises while hotter fluid sinks
  3. Electromagnetic waves vibrate particles in a straight line
  4. Particles remain stationary and transfer energy through collisions
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Answer: A

Heating causes fluids to expand and become less dense, causing them to rise; cooler, denser fluid sinks to replace them, forming convection currents.

7. Through which mechanism does heat travel through a solid metal spoon placed in hot soup?

  1. Convection
  2. Conduction
  3. Radiation
  4. Sublimation
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Answer: B

Conduction is the transfer of heat through solids via the vibration of neighboring particles.

8. Comparing the rates of thermal expansion for solids, liquids, and gases when exposed to equal temperature increases, which state expands the MOST?

  1. Solids
  2. Liquids
  3. Gases
  4. All three expand at the exact same rate
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Answer: C

Gas particles have the weakest intermolecular attraction forces, expanding significantly more than liquids or solids for a given temperature increase.

9. When two objects at different temperatures reach thermal equilibrium after being placed in contact, what condition must be true?

  1. The hotter object gains all remaining heat from the colder object
  2. Both objects reach the exact same temperature, and net heat transfer becomes zero
  3. The colder object becomes hotter than the original warm object
  4. Heat flow reverses back and forth continuously
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Answer: B

Thermal equilibrium is reached when two objects reach the same final temperature and the net rate of heat transfer between them is zero.

10. Why are solar water heater collector panels installed on house roofs painted matte black?

  1. To reflect solar light into water tubes
  2. To maximize absorption of radiant heat energy from sunlight
  3. To insulate internal copper pipes against wind
  4. To stop water inside pipes from expanding
Show answer

Answer: B

Matte black surfaces are optimal heat absorbers, absorbing thermal radiation efficiently to heat water in copper tubes.

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