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Olympiad (Class 7) Heat — practice questions

Explore 58 free Heat questions in Olympiad (Class 7) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Heat questions and exercises with answers

Showing questions 1–30 of 58.

Heat from the Sun reaches the Earth across empty space by which process?Read the answer and worked solution →A steel spoon is left standing in hot soup. Its handle slowly becomes hot by:Read the answer and worked solution →Why can convection not take place inside a solid iron rod?Read the answer and worked solution →Warm air rises above a candle flame because it is:Read the answer and worked solution →What is the normal temperature of a healthy human body in degrees Celsius?Read the answer and worked solution →Which range is marked on a typical clinical thermometer?Read the answer and worked solution →A clinical thermometer has a kink near its bulb. Its purpose is to:Read the answer and worked solution →In which SI unit is heat energy measured?Read the answer and worked solution →A hot cup of tea is held in a cold hand. In which direction does heat flow?Read the answer and worked solution →Equal masses of water at 20 degrees C and 60 degrees C are mixed with no heat lost. The final temperature is:Read the answer and worked solution →200 g of water at 80 C is mixed with 200 g at 30 C in an insulated pot. Final temperature?Read the answer and worked solution →Which of these materials conducts heat best?Read the answer and worked solution →Handles of cooking pans are made of plastic or wood because these are:Read the answer and worked solution →Woollen clothes keep us warm in winter mainly because:Read the answer and worked solution →White clothes are preferred in hot summers because white surfaces:Read the answer and worked solution →During the day, a sea breeze near a coast blows from:Read the answer and worked solution →At night, the air over the sea is warmer than over land because water:Read the answer and worked solution →Temperature of a body tells us its:Read the answer and worked solution →A bucket and a cup hold water at the same 60 degrees C. Which holds more heat energy?Read the answer and worked solution →On the Celsius scale, pure ice melts and pure water boils (at sea level) at:Read the answer and worked solution →The inner walls of a thermos flask are silvered to:Read the answer and worked solution →The vacuum between the double walls of a thermos flask mainly stops:Read the answer and worked solution →Sweating cools the body because evaporating sweat:Read the answer and worked solution →On an orbiting space station, a candle flame soon dies out because there:Read the answer and worked solution →In a natural water circulation loop, the heater should be placed:Read the answer and worked solution →An air conditioner is fixed high on a wall because cool air:Read the answer and worked solution →Ventilators are placed near the roof of a room because warm stale air:Read the answer and worked solution →Water in a beaker heated from the bottom warms throughout mainly by:Read the answer and worked solution →You hold your hand beside a campfire, not above it, and feel warmth. This warmth mostly arrives by:Read the answer and worked solution →Cooking pans often have copper or aluminium bases because these metals:Read the answer and worked solution →

Worked practice questions

Heat from the Sun reaches the Earth across empty space by which process?

  1. Conduction
  2. Convection
  3. Radiation
  4. Evaporation
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Correct answer: C. Radiation

Space has no matter to carry heat, so the energy travels as radiation, which needs no medium.

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A steel spoon is left standing in hot soup. Its handle slowly becomes hot by:

  1. Evaporation
  2. Convection
  3. Radiation
  4. Conduction
Show answer and solution

Correct answer: D. Conduction

Heat passes along the solid metal from particle to particle without the metal itself moving, which is conduction.

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Why can convection not take place inside a solid iron rod?

  1. Iron is too dense to heat
  2. It contains no particles
  3. Iron is a good conductor
  4. Its particles cannot flow
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Correct answer: D. Its particles cannot flow

Convection needs bulk movement of the material, and the particles of a rigid solid stay in fixed positions.

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