Unit Test Buoyancy, Average Density & Pressure

Multiple Choice

Buoyancy is the tendency for objects to float in a fluid. We consider buoyancy the...

• Un-gravity force 
• Anti-gravity force
• Gravitational pull
• Downwards pull on an object

Multiple Choice

Archimedes' Principle states that... 

• The buoyant force acting on an object equals the volume of the fluid displaced by the object. 
• The buoyant force acting on an object equals the weight (force of gravity) of the fluid displaced by the object.
• The buoyant force acting on an object will always be equal. 

Multiple Choice

What happens to the buoyant force as the volume of the fluid displaced increases?

• It decreases.

• It increases.

• It stays the same.

• It first increases, then decreases.

Multiple Choice

What is the relationship between buoyancy and weight in the context of sinking, rising, and floating objects?

• Buoyancy is always greater than weight

• Buoyancy equals weight when floating

• Weight is always greater than buoyancy

• Buoyancy has no effect on weight

Multiple Choice

What determines whether an object will float or sink in a fluid?

• The object's color

• The object's shape

• The buoyant force and weight

• The object's size

Multiple Choice

What is the formula to calculate the volume of an object using the displacement method?

• V = V_final + V_initial

• V = V_initial - V_final

• V = V_final - V_initial

• V = V_initial * V_final

Multiple Choice

What is the total volume of liquid in the three containers shown in the image?

• 200 ml

• 250 ml

• 300 ml

• 350 ml

Multiple Choice

What is the purpose of the overflow can method demonstrated in the image?

• To measure the volume of liquid accurately

• To mix different liquids

• To heat liquids

• To cool down liquids

Multiple Choice

What happens to the block when the weight of the object is greater than the buoyant force?

• The block floats

• The block sinks

• The block remains suspended

• The block disintegrates

Open Ended

Which one is easier to pick up? Why?

Multiple Choice

What is the reason the ball floats in the water?

• The buoyant force is less than the weight of the ball.

• The buoyant force is equal to the weight of the ball.

• The buoyant force is greater than the weight of the ball.

• The ball is made of a lighter material.

Multiple Choice

What happens to the water level when a rock is placed in a container filled with water?

• It rises

• It falls

• It stays the same

• It overflows

Multiple Select

What is the difference between a solid block of steel and a steel ship in terms of buoyancy?

• The steel block sinks because it is denser than water.

• The steel ship floats because it displaces more water.

• Both have the same weight.

• Both will sink.

Multiple Choice

WHICH ONE IS MORE LIKELY TO FLOAT?

• A

• B

• Both

• Neither

Open Ended

The shape of an object determines how much of its surface is exposed to the buoyant forces of water. If you lie flat on the surface of the water you will float, because you distribute your body weight (pressure onto the water) on a large surface and present a lot of body surface to buoyancy. In a vertical position or cannon ball, you will sink, because you place all your weight on a small area, and present only a little body surface to buoyancy. Based on this information, how does shape affect buoyancy?

Multiple Choice

Why do some substances float on water?

• they are warmer than water
• they are cooler than water
• they are more dense than water
• they are less dense than water