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JCE (Botswana) Heat: Energy Transfer — practice questions

Explore 4 free Heat: Energy Transfer questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Heat: Energy Transfer questions and exercises with answers

Showing questions 1–4 of 4.

A metal spoon is left standing in a hot drink and the handle becomes warm. Which process is this?Read the answer and worked solution →Why does warm water rise above cold water in a pot on a stove?Read the answer and worked solution →How does energy from the Sun reach the Earth across empty space?Read the answer and worked solution →Two identical water cans stand in the sun. One is dull black, the other shiny silver. Which warms faster?Read the answer and worked solution →

Worked practice questions

A metal spoon is left standing in a hot drink and the handle becomes warm. Which process is this?

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

1. The particles at the hot end of the spoon gain energy and vibrate faster. 2. They bump into neighbouring particles and pass some energy along. 3. Energy travels along the spoon this way until the handle warms up. 4. This kind of transfer through a touching material is called conduction. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Conduction_

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Why does warm water rise above cold water in a pot on a stove?

  1. It is more dense than cold water
  2. It has more mass than cold water
  3. It is less dense than cold water
  4. It has less mass than cold water
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Correct answer: C. It is less dense than cold water

1. The stove heats only the water touching the bottom of the pot. 2. Heating makes the particles in that water move faster. 3. The faster particles push further apart, so that water takes up more space. 4. The same particles now fill a larger space, so the warm water is less dense. 5. Anything less dense floats above what is denser, so the warm water rises. 6. Cooler, denser water sinks to take its place and is heated in turn. 7. This circling movement is called a convection current, and it warms the whole pot. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Convection_

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How does energy from the Sun reach the Earth across empty space?

  1. By conduction
  2. By radiation
  3. By convection
  4. By insulation
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Correct answer: B. By radiation

1. Conduction needs two things to be touching each other. 2. Convection needs a liquid or gas that can move around. 3. There is neither between the Sun and the Earth, only empty space. 4. Energy still crosses it by radiation, which needs no material at all. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Radiation_

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More Science topics

Separating MixturesAcids and BasesHeat TransferEarth and the SunGravity and the MoonPotential and Kinetic EnergyClassification of Living ThingsSources of Energy