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Course: Alhussan Physics — Stage 9
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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

11.2 Using ideas about density — Quiz

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  • Questions count: 10
  • Passing grade: B+
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1.
Why does a steel ship float?
Water pulls it up
Ships have no weight
Steel is less dense than water
Its hull encloses air, so its average density is less than water
2.
Which term matches this definition? “A line on a ship showing the maximum safe loading depth.”
Equator
Water line
Ballast line
Plimsoll line
3.
How does a submarine sink?
It fills ballast tanks with water, raising its average density
It turns off its engine
It heats its air
It empties its tanks
4.
The diagram shows forces on a floating ship. What is the upthrust?
Dr Dabour Hub Academy - figure 1
40 000 N
20 000 N
0 N
10 000 N
5.
A ship weighs 5000000 N. What weight of water must it displace to float?
10,000,000 N
5,000,000 N
0
2,500,000 N
6.
A submarine of volume 2000 m³ has mass 1900000 kg. What is its average density? (water = 1000 kg/m³)
950 kg/m³
3,800,000,000 kg/m³
1,898,000 kg/m³
9500 kg/m³
7.
How does a submarine rise?
It cools down
It adds water
It sinks first
Compressed air blows water out, lowering its density
8.
A hot air balloon rises because hot air is ____ dense than cold air.
never
equally
less
more
9.
True or false? A ship floats higher in sea water than in river water.
True
False
10.
True or false? A ship sinks lower when it carries less cargo.
True
False
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Part of Chapter 11: Forces and Density — see every lesson and quiz in this unit.
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