Question

1.)The Buoyant Force from a fluid to an object depends on which of the following factors?
a.)The volume of the object
b.)The volume of the fluid
c.)The density of the fluid
d.)The density of the object

2.)Why did the Titanic sink after it hit an iceberg and water rushed into the hull through the hole created by the collision?
a.)The density of water has increased
b.)The density of the boat increased
c.)The mass of the boat has decreased
d.)The volume of the boat decreased

3.)If the density of saltwater is 1029kg/m³, which of the following object will float in this saltwater?
a.)A cylinder made of unknown material, but mass 50kg, diameter 0.05m and height of 0.1m
b.)A cylinder with mass 1kg, diameter 0.2m and height of 0.1m
c.)A piece of quartz (quartz density is 2320kg/m³ )
d.)A piece of iron metal (iron density is 7800kg/m³ )

4.)An object with mass 2kg is floating on the surface of water( density of water is 1kg/m³). If we know the displaced volume of water from the object is 0.001m³, then the density of the object is. ( please answer in the unit of kg/m³)

5.)What is the direction of net buoyant force from the fluid to a submerged object?
a.)Right
b.)Up
c.)Left
d.)Down

6.)What does Archimedes' principle say about the buoyant force?
a.)It is equal to the weight of the displaced liquid.
b.)It is equal to the weight of the submerged object.
c.)It is equal to the weight of the container of the liquid.
d.)It is equal to the weight of the entire liquid.

7.)Why does a hollow Iron ship float in water but a solid iron nail sink?
a.)Weight of nail is more than the ship.
b.)Weight of nail is less than the ship.
c.)Ship displaces enough water to balance its weight but nail doesn't.
d.)Nail displaces enough water to balance its weight but ship doesn't.

8.)Why does an iron nail float in mercury but sink in water?
a.)Density of mercury is less than iron but density of water is more than iron.
b.)Density of mercury is more than iron but density of water is less than iron.
c.)Iron weighs less in mercury.
d.)Iron weighs more in mercury.

9.)A floating ship is more submerged in fresh water than in salt water. Why?
a.)Salt increases the density and hence the weight of the displaced water.
b.)Salt decreases the density and hence the weight of the displaced water.
c.)Salt decreases the mass of the ship.
d.)Salt increases the mass of the ship.

10.)A cylinder is allowed to float first in liquid A then in liquid B. The height of the submerged part in liquid A is 1.33 times the height of the submerged part in liquid B. What is the ratio of the density of liquid A to Liquid B?

Answer 1

5) net buoyant force always act in UP direction