Heat and Temperature Quiz
Grade 3 · Science · Quiz
Test your knowledge of heat energy, temperature, and how heat transfers.
Questions
What instrument measures temperature?
- Barometer
- Thermometer
- Ruler
- Scale
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Answer: Thermometer
A thermometer measures temperature by using a liquid (like mercury or colored alcohol) that expands when hot and contracts when cold, moving up or down a scale.
Heat and temperature are exactly the same thing.
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Answer: False
Temperature measures hotness or coldness. Heat is the thermal energy that flows between objects. A large cold lake holds more heat energy than a small drop of boiling water.
Heat transfer through fluid movement, such as in boiling water, is called ___.
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Answer: convection
Convection occurs in fluids when hot material rises and cool material sinks, creating circulation currents. It's why water in a pot heats from the bottom and stirs itself.
Which material is the best heat conductor?
- Wood
- Rubber
- Copper
- Air
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Answer: Copper
Copper is one of the best heat conductors. This is why copper is used in cooking pans and electrical wiring — it transfers both heat and electricity efficiently.
An insulator slows down the transfer of heat.
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Answer: True
Insulators have a molecular structure that traps heat and doesn't let it flow easily. Wool, fiberglass, and rubber are good insulators used in clothing and buildings.
When you hold a warm cup of cocoa, how does heat reach your hands?
- Radiation
- Convection
- Conduction
- Insulation
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Answer: Conduction
When your hand touches the warm cup, heat transfers directly from the cup to your skin through conduction — direct contact between two materials.
The type of heat transfer that can travel through empty space is called ___.
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Answer: radiation
Radiation transfers thermal energy as electromagnetic waves. It doesn't need matter to travel through, which is why we can feel heat from the Sun across 93 million miles of space.
Wood is a better conductor of heat than metal.
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Answer: False
Metal conducts heat much better than wood. Wood is actually a decent insulator — that's why wooden handles on pots stay cooler than the metal pot itself.
What happens to the temperature of hot soup as it cools down?
- It rises
- It stays the same
- It drops
- It doubles
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Answer: It drops
Hot soup loses heat to the cooler air around it through conduction, convection, and radiation. As heat leaves, the temperature of the soup drops until it equals room temperature.
Warm air rises and cool air sinks during convection.
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Answer: True
In convection, warm fluid (air or water) is less dense so it rises; cooler, denser fluid sinks. This creates circular currents that distribute heat throughout the fluid.
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