Archimedes' Principle

Q.

How physics affect our daily life?

Q. What are the applications of Archimedes' principle ?

1. It is used in designing of ships and submarines.
2. It is used in lactometers to determine the purity of milk.
3. It is used in hydrometers to determine density of fluids.
4. It is used in hydraulic lifts.

Q.

Why do ships float whereas an iron nail sinks in water?

Q.

A piece of ice floating in a glass of water melts, but the level of water in glass does not change. Give reason.

Q.

What is a hydrometer?Name the principal on which it works

Q. What is apparent weight?

Q.

What is the principle of lactometer ?

Q. An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be:

1. 2

Q. What is the expression for upward thrust on an object submerged in water

H: Height of liquid in the container
d: Density of Liquid
P: Pressure acting on the surface of water
A: area of cross-section of container
V’: Volume of object immersed in the liquid
V: volume of the container

1. Hdg
2. P/A
3. V'dg
4. Vdg

Q.

What is the buoyant force experienced by a cube of side $10cm$ which is completely immersed in water?
(Take $g=10m{s}^{-2}$ and density of water $=1000kg{m}^{-3}$)

1. $100N$

2. $10N$

3. $1000N$

4. $1N$

Q. The weight of an object is always equal to the weight of liquid displaced by it.

1. True
2. False

Q.

State Archimedes' principle.

Q.

What are the uses of hydrometer?

Q.

State Archimedes principle. Write two applications of this principle.

Q. On what principle does Lactometer work?

1. Pascal's law
2. Archimedes' principle
3. Law of gravitation
4. Newton's law of motion

Q.

What are the factors on which the sinking or floating of an object depend?

Q.

Define Archimedes’ principle. How can it be experimentally verified?

Q. Lactometer is a type of Hydrometer.
State true or false.

1. True
2. False

Q. How do fish float in water?

Q. Why a bucket of water weighs lighter inside the well than when it is outside the water

Q.

In what condition does an object float in a liquid?

1. When density of the object is less than that of the liquid.
2. When density of the object is greater than that of liquid.
3. When the object displaces a volume of liquid more than its own volume.
4. When gravitational force is greater than buoyant force.

Q.

The floatation of a ship is an application of Archimedes' principle.

1. True

2. False

Q. Weight of the water displaced by a floating body is equal to the .

1. weight of body
2. buoyant force
3. frictional force

Q.

What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ?
When does the buoyant force become maximum ?

Q.

A body floats in a liquid with a part of it submerged inside liquid. Is the weight of floating body greater than, equal to or less than upthrust ?

Q.

Archimedes' principle cannot be applied to gases.

1. True

2. False

Q. Statement 1: A person feels lighter in water.
Statement 2: Apparent loss in weight of a body in the water is equal to the buoyant force.

Which of the following statement is true?

1. Statement 2 is correct.
2. Both statements are correct.
3. Both statements are incorrect.
4. Statement 1 is correct.

Q.

What is the direction of buoyant force?

Q. Leader has a density than iron in both are denser than water is the buoyant force on a lead object is greater than or lesser than or equal to the buoyant force on an object of the same volume explain your answer giving the reason

Q.

Why do we feel light on our feet when standing in a swimming pool with water up to our armpits ?