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JCE (Botswana) Stored Solar Energy — practice questions

Explore 3 free Stored Solar Energy questions in JCE (Botswana) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Stored Solar Energy questions and exercises with answers

Showing questions 1–3 of 3.

Why is coal counted as a non-renewable energy source?Read the answer and worked solution →Where did the energy stored in coal originally come from?Read the answer and worked solution →Crude oil is separated into petrol, diesel and tar by careful heating. Which property makes this possible?Read the answer and worked solution →

Worked practice questions

Why is coal counted as a non-renewable energy source?

  1. It takes millions of years to form
  2. It burns away without any smoke
  3. It is found in only one place
  4. It gives off very little energy
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Correct answer: A. It takes millions of years to form

1. A renewable source is replaced as fast as it is used. 2. Coal forms from buried plant material over millions of years. 3. Once a coal seam is burnt it cannot be replaced within a human lifetime. 4. That is why coal is classed as non-renewable. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Stored solar energy_

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Where did the energy stored in coal originally come from?

  1. From heat trapped inside rocks
  2. From wind trapped in swamps
  3. From sunlight trapped by plants
  4. From water trapped in soil
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Correct answer: C. From sunlight trapped by plants

1. Coal formed from plants that grew in swamps millions of years ago. 2. Those plants trapped the energy of sunlight by photosynthesis. 3. When they died the stored energy was buried with them. 4. Heat and pressure turned the buried layers into coal, energy and all. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Formation of coal_

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Crude oil is separated into petrol, diesel and tar by careful heating. Which property makes this possible?

  1. Their densities all differ
  2. Their boiling points differ
  3. Their colours all differ
  4. Their smells all differ
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Correct answer: B. Their boiling points differ

1. Crude oil is a mixture of many different substances. 2. Each of those substances boils at its own temperature. 3. Heating the mixture slowly makes the lowest boiling substance evaporate first. 4. Raising the temperature further drives off the next one, and so on. 5. Separating a mixture this way is called fractional distillation. 6. Colour and smell can be noticed but cannot be used to split the mixture apart. _Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Formation of crude oil and natural gas_

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More Science topics

Separating MixturesAcids and BasesHeat TransferEarth and the SunGravity and the MoonHeat: Energy TransferPotential and Kinetic EnergyClassification of Living Things