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Quiz Chapter 9: Heat

10 questions · Form 2 Science Bab 9: Heat

Question 1 of 10Score: 0

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

Full Question List & Answer Key

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

1. 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.

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. 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.

4. Why is mercury commonly used as the working fluid in traditional liquid-in-glass laboratory thermometers?

  1. Mercury expands non-uniformly across temperature ranges
  2. Mercury is an opaque metal liquid that expands uniformly and does not stick to glass walls
  3. Mercury has a very high boiling point and low density
  4. Mercury acts as a perfect thermal insulator
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Answer: B

Mercury expands evenly and predictably over a wide temperature range, is easily visible, and does not wet glass capillary walls.

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. Which method of heat transfer can travel through a complete vacuum without requiring any physical medium?

  1. Conduction
  2. Convection
  3. Radiation
  4. Evaporation
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Answer: C

Radiation transfers heat energy via electromagnetic waves, allowing heat from the Sun to travel through space vacuum.

7. Why are pot handles usually covered with plastic or wooden casing?

  1. To conduct heat into the cook's hand quickly
  2. Because wood and plastic are good thermal insulators that prevent heat transfer to hands
  3. To increase the total mass and weight of the pot
  4. To absorb infrared radiation from surrounding air
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Answer: B

Plastic and wood are thermal insulators with low heat conductivity, keeping handles cool and safe to hold.

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. 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.

10. 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.

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