Plate Tectonics Buoyancy

Buoyancy is a force that acts in which direction?

• Up, against gravity

• Down, with gravity

• In all directions

• Buoyancy is not a force

What happens if the weight of an object is greater than the buoyant force?

• it floats

• it sinks

• it bounces

• it vibrates

An object weighing 10 N in air, weighs 5.5 N a liquid. The buoyant force experienced by the object is :

• 10-5.5=4.5
• 10/5.5=1.8182
• 5.5/10=0.55
• 10+5.5=15.5

The same body is immersed in two liquids A and B in succession. The extent to which the body sinks in liquid B is less then in liquid A. What are the conclusions that could be derived from such an observation

• The denisty of liquid A is more then B<br />
• The denisty of liquid B is more then A<br /><br />
• The density of solid is less then the liquid in both
• No such conclusion can be made

A student lowers a body in a liquid filled in a container. He finds that there is a maximum apparent loss in weight of the body when

•   It just touches the surface of the liquid.
•  It is partially immersed and also touches the sides of the container.
•  It is completely immersed in the liquid
•   It is partially immersed in the liquid.

An object of weight 500 N is floating in a liquid. The magnitude of buoyant force acting on it is

• 500
• 400
• 200
• 100

When a solid body is fully immersed in a liquid, the volume of the displaced liquid is:

• Less then the volume of the solid body
•   Equal to the volume of the solid body
•  Greater then the volume of the sold body
•  Depending upon the manner in which the body is being immersed in the liquid

Hot air balloons rise when the air inside the balloon is heated. Which statement must be false?

• Hot air is less dense than cool air

• The volume of the balloon is equal to the volume of the air it displaces

• As the air in the balloon cools, the density decreases

• The air in the balloon weighs more than the air it displaces

If an object is neutrally buoyant it will ________.

• sink

• float

• neither float or sink

• objects cannot be neutrally buoyant...

What is the word for the balance between the weight force of the lithosphere and the buoyancy force on the lithosphere?

• Isostasy

• Insolation

• buoyancy

• equilibrium