Quiz G. Physics Assignment 2

What does the principle of Archimedes state?

• An object immersed in a fluid sinks if its weight is greater than the fluid's weight.

• An object immersed in a fluid displaces a fluid volume equal to its own volume.

• An object immersed in a fluid experiences a buoyant force equal to its own weight.

• An object immersed in a fluid experiences a buoyant force equal to the weight of the displaced fluid.

Which principle explains why helium balloons rise in air?

• Archimedes' Principle

• Bernoulli's Principle

• Pascal's Principle

• Newton’s Third Law

Which of the following is true when an object is completely submerged in a fluid?

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

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

• The buoyant force is equal to the weight of the displaced fluid.

• The buoyant force depends on the shape of the object.

How does a submarine control its depth in water?

• By changing the shape of its hull to increase or decrease displacement.

• By adjusting the mass of the submarine using ballast tanks to control buoyancy.

• By moving water out of its ballast tanks to increase weight and sink.

• By altering the density of water around it using propellers.

How does a hydrometer measure the density of a liquid?

• By displacing a fixed volume of liquid and measuring the weight.

• By floating at a specific depth depending on the liquid's density.

• By sinking completely and measuring the pressure at the bottom.

• By creating vibrations and analyzing the fluid's resistance.

An object will float in a fluid if its density is:

• Greater than the density of the fluid

• Equal to the density of the fluid

• Less than the density of the fluid

• Independent of the density of the fluid

A ship floats in both freshwater and seawater. Compared to freshwater, the ship will:

• Float higher in seawater.

• Float lower in seawater.

• Displace the same weight of fluid in both.

• Displace a smaller volume of seawater.

If a 5 kg object displaces 3 kg of water when fully submerged, what is the net force acting on the object?

• 2 kg upward

• 
  2 kg downward

• 
  3 kg upward

• 5 kg upward

The hydrometer floats deeper in a liquid with:

• Higher density.

• Lower density.

• Neutral density.

• Constant density

Why is it important to measure the salinity of water in an aquarium using a hydrometer?

• To monitor the balance between salt and water for the aquatic species.

• To confirm that the salinity supports the health of marine organisms.

• To assess the water’s ability to hold dissolved oxygen for fish.

• To check the temperature stability of the aquarium water