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Energy and Heat Practice Tests

These Grade 7 Science practice tests build understanding of kinetic and potential energy, thermal energy, heat, temperature, conduction, convection, radiation, insulation, energy transformations, and conservation.

Skills covered

  • Distinguishing kinetic, potential, chemical, thermal, electrical, light, and sound energy
  • Explaining the difference between heat, temperature, and total thermal energy
  • Identifying conduction, convection, radiation, and insulation in real situations
  • Tracking energy transfers and transformations in systems
  • Applying conservation of energy to machines, motion, heating, and everyday technology

How to use these practice tests

For each question, identify the system and the energy form involved. Then trace where energy moves or changes and decide whether the evidence describes heat transfer, temperature, or energy conservation.

For more Grade 7 Science practice, return to the Grade 7 Science category.

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Grade 7 Energy and Heat Practice Tests

Practice Grade 7 Science energy and heat questions about energy forms, heat, temperature, transfer, insulation, and conservation.

Choose the best answer for each question. Review the explanation after submitting your answers.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What does the law of conservation of energy state?

Please select an answer first.

Correct answer: A

The correct answer is Energy cannot be created or destroyed, but it can be transferred or transformed..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: A complete energy account includes transfers and transformations without changing the total amount.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

A complete energy account includes transfers and transformations without changing the total amount.

2. QuestionMultiple choice

Why does a rolling ball eventually stop on a real floor?

Please select an answer first.

Correct answer: B

The correct answer is Friction transfers some of its kinetic energy into thermal energy..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Friction changes organized motion into thermal energy in the ball and floor.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Friction changes organized motion into thermal energy in the ball and floor.

3. QuestionMultiple choice

A lamp receives 100 units of electrical energy and produces light plus thermal energy. What is true?

Please select an answer first.

Correct answer: C

The correct answer is The light and thermal energy together account for the input energy in an ideal model..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Energy is transformed into useful light and thermal energy; the total output is accounted for by conservation.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Energy is transformed into useful light and thermal energy; the total output is accounted for by conservation.

4. QuestionMultiple choice

What happens to gravitational potential energy as a dropped object falls?

Please select an answer first.

Correct answer: D

The correct answer is It decreases while kinetic energy generally increases..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: As height decreases, gravitational potential energy is converted mainly into kinetic energy.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

As height decreases, gravitational potential energy is converted mainly into kinetic energy.

5. QuestionMultiple choice

What happens when a stretched rubber band is released?

Please select an answer first.

Correct answer: A

The correct answer is Elastic potential energy changes into kinetic energy and some thermal or sound energy..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Stored elastic energy becomes motion and can also be transferred to sound and thermal energy.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Stored elastic energy becomes motion and can also be transferred to sound and thermal energy.

6. QuestionMultiple choice

Why can a generator produce electrical energy when its turbine turns?

Please select an answer first.

Correct answer: B

The correct answer is Mechanical energy is transformed into electrical energy..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: A generator uses motion in a magnetic system to transfer mechanical energy into electrical energy.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

A generator uses motion in a magnetic system to transfer mechanical energy into electrical energy.

7. QuestionMultiple choice

Why is no machine perfectly efficient?

Please select an answer first.

Correct answer: C

The correct answer is Some input energy is transferred to less useful forms such as thermal or sound energy..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Real machines have friction and other processes that spread energy into less useful forms.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Real machines have friction and other processes that spread energy into less useful forms.

8. QuestionMultiple choice

What is efficiency a comparison of?

Please select an answer first.

Correct answer: D

The correct answer is Useful output energy compared with input energy.

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Efficiency describes how much of the input energy becomes the desired output.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Efficiency describes how much of the input energy becomes the desired output.

9. QuestionMultiple choice

Why can an energy diagram help scientists?

Please select an answer first.

Correct answer: A

The correct answer is It shows where energy enters, changes form, transfers, and leaves a system..

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Energy diagrams help track conservation and identify useful and less useful outputs.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Energy diagrams help track conservation and identify useful and less useful outputs.

10. QuestionMultiple choice

What is a system in an energy investigation?

Please select an answer first.

Correct answer: B

The correct answer is The objects and processes chosen for analysis.

  1. Identify the energy idea: Determine whether the question concerns energy form, energy transfer, heat, temperature, or an energy system.
  2. Connect the evidence: Defining the system helps decide which transfers and transformations are included in the energy account.
  3. Check conservation: Energy can move or change form, but a complete system accounts for the energy rather than treating it as created or destroyed.

Defining the system helps decide which transfers and transformations are included in the energy account.

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