Physics MCQs with answers Page - 20

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Q. When hot-water is sprinkled on a hotter glass tumbler, it breaks because

  • (A) Glass suddenly expands
  • (B) Glass suddenly contracts
  • (C) Water evaporates
  • (D) Glass reacts chemically with water

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Q. A gap is left between two rails of a railway track to accommodate...... of the metal.

  • (A) Areal expansion
  • (B) Volume expansion
  • (C) Linear expansion
  • (D) Apparent expansion

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Q. Which of the following is arranged in order of decreasing conductivity?

  • (A) Copper, Aluminium, Steel, Silver
  • (B) Aluminium, Silver, Copper, Steel
  • (C) Copper, Silver, Aluminium, Steel
  • (D) Silver, Copper, Aluminium, Steel

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Q. Every hot object emits ________

  • (A) X–rays
  • (B) Visible light
  • (C) Infrared rays
  • (D) Ultraviolet rays

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Q. Which metal is the best conductor of heat?

  • (A) Silver
  • (B) Gold
  • (C) Copper
  • (D) All of the above

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Q. When hot liquid is poured into a thick glass tumbler, it cracks because glass :

  • (A) Is a bad conductor of heat so only inner surface expands
  • (B) Has high temperature coefficient of expansion
  • (C) Has a very low specific heat
  • (D) Has low temperature coefficient of expansion

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Q. Mud houses are cooler in summers and warmer in winters as compared to brick houses because

  • (A) Mud is a good conductor
  • (B) Mud is a bad conductor
  • (C) Mud is a poor insulator
  • (D) Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters

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Q. During hot weather, the fan produces a feeling of comfort. This is because

  • (A) Fan supplies cool air
  • (B) Fan cools the air
  • (C) Our perspiration eva-porates rapidly
  • (D) Conductivity of air increases

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Q. The flow of thermal energy is called

  • (A) Heat
  • (B) Current
  • (C) Voltage
  • (D) Potential

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Q. On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

  • (A) Metals have higher thermal capacity than plastics
  • (B) Plastics have a lower density than metals
  • (C) Metals are good conductors of heat
  • (D) Plastics have a higher thermal conductivity than metals

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