Curriculum
Course: Alhussan Physics — Stage 9
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Curriculum

Alhussan Physics — Stage 9

Chapter 11: Forces and Density

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Chapter 12: Energy Transfer

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Chapter 13: Sound Waves

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Chapter 14: Electrical Circuits, Resistance and Power

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Chapter 15: The Earth in Space (Universe and Stars)

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Quiz

12.2 Conservation of energy — Quiz

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  • Questions count: 10
  • Passing grade: B+
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1.
Which term matches this definition? “Energy cannot be created or destroyed, only transferred or stored.”
Hooke's law
Law of conservation of energy
Newton's first law
Ohm's law
2.
What happens to wasted energy?
It disappears
It is destroyed
It usually heats the surroundings
It becomes mass
3.
A lamp uses 200 J and gives 30 J of light. What is its efficiency?
150%
15%
170%
667%
4.
A motor is 60% efficient and uses 500 J. How much useful energy is transferred?
300 J
8 J
440 J
30,000 J
5.
The diagram shows a kettle's energy transfers. How much energy heats the surroundings?
Dr Dabour Hub Academy - figure 1
2000 J
1800 J
200 J
3800 J
6.
Which is useful energy from a light bulb?
Sound
Heat in the room
Nothing
Light
7.
Like coins in a pocket, energy:
Increases
Is created
Is the same amount at the start and end
Disappears
8.
Friction makes moving parts of machines ____.
cold
lighter
faster
warm
9.
True or false? Wasted energy is lost and destroyed.
True
False
10.
True or false? In every transfer, total energy at the end equals total energy at the start.
True
False
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Part of Chapter 12: Energy Transfer — see every lesson and quiz in this unit.
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