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- 1. Multiple Choice
A ball of volume 𝑉b and density 𝜌b is released in a
volume 𝑉1 of liquid with density 𝜌1. The upthrust on
the ball is given by ____.
𝑉b 𝜌b 𝑔
𝑉b 𝜌1 𝑔
𝑉1 𝜌b 𝑔
𝑉1 𝜌1 𝑔
- 2. Multiple Choice
A block of metal is thrown into a lake. What
happens to the buoyant force as it sinks deeper in the
water?
Increases
Decreases
Stay the same
increase and then decrease
- 3. Multiple Choice
What is the buoyant force on a 20 𝑘𝑔 box that
displaces 4 𝑚3 of water?
800N
40000N
4000N
20000N
- 4. Multiple Choice
Three equal sized balls of volume 10𝑐𝑚3 are
made of cork, aluminum and lead with their
respective masses of 2𝑔, 27𝑔 𝑎𝑛𝑑 113𝑔. They are
submerged in water as shown in the figure.
Which of the statements below is incorrect?
The cork would rise up and float
Buoyant force on lead is the largest
Lead and aluminum would both sink
Each ball would displace the same
volume of water
- 5. Multiple Choice
A 5 N stone is dropped in a lake and it sinks.
Which of the relationships below is true for the
buoyant force on the stone?
𝐹b = 0
𝐹b = 5
𝐹b is greater than 5
𝐹b is less than 5
- 6. Multiple Choice
What is the magnitude of the buoyant force on a
20 𝑁 ball that is floating in a liquid of density
800𝑘𝑔/𝑚3 .
20N
40N
80N
800N
- 7. Multiple Choice
Find the tension in the wire supporting a
120 𝑘𝑔 object of volume 0.1𝑚3 submerged in water
as shown in the figure below.
200N
400N
880N
2200N
- 8. Multiple Choice
An object will be in equilibrium in a fluid if __.
the weight of an object is greater than the
buoyant force
the weight of an object is less than the
buoyant force
the weight of an object is equal to the
buoyant force
the weight doesn't affect if an object
sinks, only its state of matter
- 9. Multiple Choice
Which of the following statements is/are correct
about neutral buoyancy?
The object is lighter than the fluid it displaces
The object is denser than the fluid it displaces
The object’s weight is equal to the fluid it
displaces
- 10. Multiple Choice
What is the magnitude of net force acting on the object in water if mass of object is 20Kg and buoynat force is 40N.
240N
20N
160N
200N
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