Grades 6, 7 and 8 | Science | Middle School

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Science: Middle School: Grades 6, 7 and 8 Quiz - Energy Transfers (Questions)

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Some ways that energy transfer occurs are: radiation, heat conduction, convection, electrical power transmission and mechanical work. In Science, the Law of Conservation of Energy states that energy can be transformed, it can't be created or destroyed.

Which is the MAIN energy transfer taking place when a candle burns?

[ ]	Chemical → light
[ ]	Chemical → sound
[ ]	Light → chemical
[ ]	Thermal → chemical

Which is the MAIN energy transfer taking place when a gas fire burns?

[ ]	Chemical → sound
[ ]	Chemical → thermal
[ ]	Thermal → chemical
[ ]	Thermal → light

Which is the MAIN energy transfer when a light bulb is switched on?

[ ]	Electrical → light
[ ]	Electrical → sound
[ ]	Light → electrical
[ ]	Light → thermal

Which is the MAIN energy transfer when using a microphone?

[ ]	Electrical → sound
[ ]	Electrical → thermal
[ ]	Sound → electrical
[ ]	Sound → thermal

Which is the MAIN energy transfer in a loudspeaker?

[ ]	Electrical → sound
[ ]	Electrical → thermal
[ ]	Sound → electrical
[ ]	Sound → thermal

Which is the MAIN energy transfer when you drop a ball?

[ ]	Kinetic → potential
[ ]	Kinetic → sound
[ ]	Potential → kinetic
[ ]	Potential → thermal

Which is the MAIN energy transfer in a solar cell on a calculator?

[ ]	Electrial → light
[ ]	Light → electrical
[ ]	Light → kinetic
[ ]	Light → thermal

Which is the MAIN energy transfer when a cyclist brakes to stop?

[ ]	Kinetic → elastic
[ ]	Kinetic → potential
[ ]	Kinetic → thermal
[ ]	Thermal → kinetic

Which is the MAIN energy transfer when a ball rolls UP a ramp?

[ ]	Kinetic → potential
[ ]	Kinetic → thermal
[ ]	Potential → kinetic
[ ]	Potential → sound

10.

Which is the MAIN energy transfer when a wind-up clockwork toy is released?

[ ]	Elastic → kinetic
[ ]	Elastic → potential
[ ]	Kinetic → elastic
[ ]	Kinetic → sound

Science: Middle School: Grades 6, 7 and 8 Quiz - Energy Transfers (Answers)

Which is the MAIN energy transfer taking place when a candle burns?

[x]	Chemical → light
[ ]	Chemical → sound
[ ]	Light → chemical
[ ]	Thermal → chemical

Thermal energy is also produced

Which is the MAIN energy transfer taking place when a gas fire burns?

[ ]	Chemical → sound
[x]	Chemical → thermal
[ ]	Thermal → chemical
[ ]	Thermal → light

The energy stored in gas is chemical, light is also produced but is not the main product

Which is the MAIN energy transfer when a light bulb is switched on?

[x]	Electrical → light
[ ]	Electrical → sound
[ ]	Light → electrical
[ ]	Light → thermal

Which is the MAIN energy transfer when using a microphone?

[ ]	Electrical → sound
[ ]	Electrical → thermal
[x]	Sound → electrical
[ ]	Sound → thermal

A microphone converts sound into an electrical signal. This is then passed to a speaker which reverses the process

Which is the MAIN energy transfer in a loudspeaker?

[x]	Electrical → sound
[ ]	Electrical → thermal
[ ]	Sound → electrical
[ ]	Sound → thermal

Which is the MAIN energy transfer when you drop a ball?

[ ]	Kinetic → potential
[ ]	Kinetic → sound
[x]	Potential → kinetic
[ ]	Potential → thermal

The ball has potential (stored) energy due to gravity

Which is the MAIN energy transfer in a solar cell on a calculator?

[ ]	Electrial → light
[x]	Light → electrical
[ ]	Light → kinetic
[ ]	Light → thermal

Which is the MAIN energy transfer when a cyclist brakes to stop?

[ ]	Kinetic → elastic
[ ]	Kinetic → potential
[x]	Kinetic → thermal
[ ]	Thermal → kinetic

The thermal (heat) energy is produced by friction

Which is the MAIN energy transfer when a ball rolls UP a ramp?

[x]	Kinetic → potential
[ ]	Kinetic → thermal
[ ]	Potential → kinetic
[ ]	Potential → sound

As the ball rolls up, it gains potential energy due to gravity

10.

Which is the MAIN energy transfer when a wind-up clockwork toy is released?

[x]	Elastic → kinetic
[ ]	Elastic → potential
[ ]	Kinetic → elastic
[ ]	Kinetic → sound