Grade 9 Physics: Buoyancy Quiz

What is buoyancy?

• The force that acts downward on an object in a fluid

• The upward force exerted by a fluid on an object placed in it

• The weight of an object

• The pressure exerted by a fluid on an object

The buoyant force on an object depends on:

• The mass of the object

• The volume of the object submerged in the fluid

• The surface area of the object

• The color of the object

When does an object float on the surface of a liquid?

• When its weight is greater than the buoyant force

• When its weight is equal to the buoyant force

• When the density of the object is greater than the density of the liquid

• When the buoyant force is greater than the weight of the object

What is the condition for an object to sink in a liquid?

• The density of the object is less than the density of the liquid

• The buoyant force is greater than the weight of the object

• The density of the object is greater than the density of the liquid

• The weight of the object is less than the buoyant force

Which of the following principles explains buoyancy?

• Newton's Third Law

• Archimedes' Principle

• Pascal's Law

• Kepler's Law

The weight of the water displaced by a floating object is equal to:

• The weight of the object

• The mass of the object

• The buoyant force

• The density of the object

What happens when the buoyant force is less than the weight of an object?

• The object floats

• The object sinks

• The object moves sideways

• The object remains at the same level

Which of the following is true for a floating object?

• Its weight is less than the buoyant force

• Its weight is equal to the buoyant force

• Its density is greater than that of the liquid

• Its volume is greater than the volume of the liquid displaced

Why do ships float even though they are made of materials denser than water?

• Because their weight is less than the buoyant force

• Because they displace a large volume of water

• Because they have engines

• Because their shape increases their weight

What will happen if an object is fully submerged in water and the density of the object is less than the density of water?

• It will sink

• It will float upward

• It will remain in equilibrium

• It will stay submerged