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Olympiad (Class 7) Heat — practice questions — page 2

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 31–58 of 58.

An iron rod and a wooden stick are both at 25 degrees C. Iron feels colder to touch because it:Read the answer and worked solution →Which surface absorbs the most radiant heat?Read the answer and worked solution →A laboratory thermometer commonly has a scale that spans:Read the answer and worked solution →A mercury thermometer works because liquid mercury:Read the answer and worked solution →Before use, mercury in a clinical thermometer is jerked down below which mark?Read the answer and worked solution →Unlike a non-registering thermometer, a clinical thermometer:Read the answer and worked solution →Two touching objects stop exchanging heat when they:Read the answer and worked solution →Rubbing both palms together quickly makes them warm because friction:Read the answer and worked solution →A beaker of water at 30 degrees C warms by 4 degrees C every minute. What is its temperature after 6 minutes?Read the answer and worked solution →A patient's thermometer reads 38.5 degrees C. By how much is this above the normal 37 degrees C?Read the answer and worked solution →Tea at the same temperature burns lips more in a metal mug than a ceramic mug because metal:Read the answer and worked solution →Coastal cities have milder temperature swings than inland cities because water:Read the answer and worked solution →Two identical cans hold water at 80 degrees C. One is wrapped in thick wool. After 30 minutes, which is hotter?Read the answer and worked solution →A jar of hot red water is placed above a jar of cold blue water with a card between. After the card is removed, the liquids:Read the answer and worked solution →In a metal rod heated at one end, heat travels to the other end by:Read the answer and worked solution →Which of these is the poorest conductor of heat?Read the answer and worked solution →Thermal imaging cameras detect which kind of radiation given out by warm bodies?Read the answer and worked solution →To cool a jug of water quickly, ice should be placed:Read the answer and worked solution →Ice wrapped in a thick blanket melts slowly because the blanket:Read the answer and worked solution →Birds fluff up their feathers in winter to:Read the answer and worked solution →The bottoms of cooking vessels are often blackened with soot because black surfaces:Read the answer and worked solution →Normal body temperature on the Fahrenheit scale is nearly:Read the answer and worked solution →Heat is a form of:Read the answer and worked solution →When a 90 degrees C block touches a 10 degrees C block, the hotter block's temperature will:Read the answer and worked solution →While measuring the temperature of hot water, the laboratory thermometer should be held:Read the answer and worked solution →An ice cube melts in your hand because heat flows:Read the answer and worked solution →Thick mud walls keep a hut cooler in summer mainly because mud is a:Read the answer and worked solution →Some solar water heaters move hot water upward without a pump by:Read the answer and worked solution →

Worked practice questions

An iron rod and a wooden stick are both at 25 degrees C. Iron feels colder to touch because it:

  1. is colder than wood
  2. pulls heat from hand
  3. holds cold particles
  4. reflects the body heat
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Correct answer: B. pulls heat from hand

Iron conducts heat away from the skin much faster than wood, which the hand senses as colder.

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Which surface absorbs the most radiant heat?

  1. Shiny silver
  2. Dull black
  3. Plain white
  4. Light yellow
Show answer and solution

Correct answer: B. Dull black

Dark, dull surfaces absorb most of the radiation that falls on them, while shiny and light ones reflect it.

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A laboratory thermometer commonly has a scale that spans:

  1. 0 to 37 degrees C
  2. 35 to 42 degrees C
  3. -10 to 110 degrees C
  4. 100 to 500 degrees C
Show answer and solution

Correct answer: C. -10 to 110 degrees C

Its range, from slightly below freezing to slightly above boiling water, suits most school experiments.

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