An object immersed in a fluid experiences an upward force called:
a) Gravitational force
b) Buoyant force
c) Centripetal force
d) Magnetic force
Buoyant force is equal to the weight of:
a) The object
b) The displaced fluid
c) The entire fluid in the container
d) The fluid above the object
Which principle governs buoyancy?
a) Newton’s third law
b) Bernoulli’s principle
c) Archimedes’ principle
d) Pascal’s law
An object will float in a fluid if its density is:
a) Greater than the fluid’s density
b) Equal to the fluid’s density
c) Less than the fluid’s density
d) Unaffected by the fluid’s density
If an object is fully submerged and does not sink or float, its density is:
a) Greater than the fluid’s density
b) Equal to the fluid’s density
c) Less than the fluid’s density
d) Changing continuously
The apparent weight of a submerged object is:
a) Greater than its actual weight
b) Equal to its actual weight
c) Less than its actual weight
d) Unaffected by buoyancy
A ship floats because:
a) It is made of wood
b) Its weight is less than the buoyant force
c) Water pressure pushes it down
d) Gravity is weaker in water
Which factor does NOT affect buoyant force?
a) Volume of the displaced fluid
b) Density of the fluid
c) Mass of the object
d) Acceleration due to gravity
A completely submerged object displaces a volume of fluid equal to:
a) Its own volume
b) Half its volume
c) Twice its volume
d) Its mass
Which of the following will experience the greatest buoyant force?
a) A small rock in water
b) A beach ball in water
c) A metal cube in oil
d) A wooden plank in air
A hot air balloon rises because:
a) Hot air is denser than cold air
b) The air inside the balloon is lighter than the surrounding air
c) Gravity does not affect hot air
d) The pressure inside the balloon is greater
Which liquid provides the greatest buoyant force?
a) Water
b) Alcohol
c) Mercury
d) Oil
If an object floats in water, its weight is:
a) Greater than the buoyant force
b) Less than the buoyant force
c) Equal to the buoyant force
d) Not related to buoyancy
A piece of wood floats on water because:
a) It is hollow
b) It has low density
c) Water repels it
d) Gravity does not affect wood
Which of the following objects will sink in water?
a) A plastic bottle
b) A piece of cork
c) A block of iron
d) A wooden log
What happens to the buoyant force when an object is fully submerged?
a) It increases
b) It decreases
c) It remains constant
d) It depends on the object’s shape
If an object sinks to the bottom, its weight is:
a) Less than the buoyant force
b) Equal to the buoyant force
c) Greater than the buoyant force
d) Unaffected by buoyancy
How does saltwater affect buoyancy compared to freshwater?
a) Buoyancy increases
b) Buoyancy decreases
c) Buoyancy remains the same
d) Objects always sink
Submarines control their depth by:
a) Increasing speed
b) Changing their weight
c) Expanding their size
d) Adjusting buoyancy
Why do air bubbles in water rise to the surface?
a) They are denser than water
b) Water pushes them downward
c) Their buoyant force is greater than their weight
d) Gravity does not affect gases
Which of the following statements is true about an object floating in water?
a) It displaces more water than its weight
b) Its weight equals the buoyant force
c) It experiences no buoyant force
d) It is heavier than the displaced fluid
How does increasing an object’s volume affect its buoyancy?
a) Increases buoyancy
b) Decreases buoyancy
c) No effect
d) It depends on mass
A diver feels lighter in water due to:
a) Less gravity
b) Less mass underwater
c) Buoyant force acting upwards
d) Increased body density
What will happen to a floating object if it gains weight?
a) It will rise higher
b) It will sink lower
c) It will remain unchanged
d) It will move faster
A hollow metal sphere floats because:
a) The air inside reduces density
b) The metal repels water
c) It has greater weight
d) It displaces less water
If a boat moves from freshwater to saltwater, it will:
a) Sink
b) Float higher
c) Float lower
d) Remain unchanged
Which property of a liquid affects buoyancy the most?
a) Temperature
b) Density
c) Surface tension
d) Viscosity
Why do ships have a deeper draft in freshwater?
a) Freshwater has less density
b) Freshwater has more buoyancy
c) Gravity is weaker in freshwater
d) Water molecules repel the ship
