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Quiz Chapter 9: Heat

10 questions · Form 2 Science Bab 9: Heat

Question 1 of 10Score: 0

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

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. What structural feature in a vacuum thermos flask prevents heat loss by both Conduction and Convection?

  1. A double-walled glass container with a vacuum space between walls
  2. A shiny silver inner lining
  3. A tight cork stopper at the top opening
  4. A thick outer metal case
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Answer: A

Conduction and convection both require a physical medium (particles) to transfer heat; a vacuum space eliminates particles, preventing both modes.

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. 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.

5. What is the SI unit for measuring heat energy?

  1. Joule (J)
  2. Kelvin (K)
  3. Degree Celsius (°C)
  4. Pascal (Pa)
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Answer: A

Heat is a form of energy, so its standard SI unit is the Joule (J).

6. In a bimetallic strip made of brass and iron bonded together, brass expands faster than iron when heated. Which way will the strip bend when heated?

  1. Bends towards the iron side
  2. Bends towards the brass side
  3. Remains completely straight
  4. Twists in a spiral shape
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Answer: A

Because brass expands more than iron for the same temperature rise, the longer brass side curves around the shorter iron side, bending towards iron.

7. What happens to the kinetic energy and movement of particles inside a copper rod when it is heated?

  1. Particles lose kinetic energy and stop moving completely
  2. Particles gain kinetic energy, vibrating faster and pushing slightly further apart
  3. Particles shrink in size while staying in fixed positions
  4. Particles transform directly into liquid state instantly
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Answer: B

Heating transfers thermal energy into kinetic energy, causing solid lattice particles to vibrate more vigorously and expand space between them.

8. 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.

9. 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.

10. What phenomenon causes a sea breeze during daytime coastal weather?

  1. Land cools faster than the sea
  2. Land heats up faster than the sea, causing warm air above land to rise and cool sea air to blow inland
  3. Radiation from sea water heats up air faster than land
  4. Conduction through sea sand pushes air outward
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Answer: B

During the day, land heats faster than sea water; rising warm air over land creates low pressure, pulling cooler air from the sea.

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