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1
What is the initial energy source for a solar-powered calculator?
A
Light energy
B
Electrical energy
C
Chemical energy
D
Heat energy
2
Which sequence correctly traces the energy transformations in a battery-powered flashlight?
A
Light → Electrical → Chemical
B
Electrical → Chemical → Light
C
Chemical → Electrical → Light
D
Chemical → Light → Electrical
3
In a wind-up toy, what is the correct order of energy changes from the moment you wind it to when it moves?
A
Kinetic → Elastic potential → Sound
B
Elastic potential → Kinetic → Sound
C
Elastic potential → Sound → Kinetic
D
Sound → Kinetic → Elastic potential
4
A student says, 'When I turn on a fan, electrical energy changes directly to kinetic energy.' Is this statement completely correct?
A
No, because some electrical energy also changes to heat energy.
B
No, because the fan uses chemical energy first.
C
Yes, because electrical energy always becomes kinetic energy.
D
Yes, because the fan blades move, so it's only kinetic.
5
Which of these systems involves at least three energy transformations?
A
A book falling off a table
B
A ball rolling down a hill
C
A solar panel powering a radio
D
A candle burning