Archimedes Principle

Q.

Archimedes' principle states that when a body is totally or partially immersed in a fluid, the upthrust is equal to:

1. The weight of the fluid displaced by the body

2. The weight of the body

3. The volume of the body

4. The volume of the fluid displaced

Q.

State whether upthrust will increase or decrease if the density of a liquid in which the solid floats decreases.

Q.

When a body is wholly or partially immersed in a liquid it experiences a buoyant force which is equal to the:

1. volume of liquid displaced by it

2. weight of liquid displaced by it

3. both (A) and (B)

4. none of the (A) or (B)

Q.

If the relative density of a solid is greater than 1, does the solid sink in water.

Q.

How does a submarine work? State and explain with the help of Archimedes principle.

Q.

The relative density of a substance is greater than 1. What does it signify?

Q.

A body having a relative density of 0.5 will sink or float in water and why?

Q.

What is buoyant force ? What are the factors on which the buoyant force depends ?

Q.

Give practical applications of Archimedes principle.

Q.

State Archimedes principle.How is Archimedes principle used to design ships and submarines?

Q.

A body when completely submerged experiences greater force in sea water compared to in river water.

1. True
2. False

Q.

To what extent the atmosphere is extended above the surface of the Earth, assuming the density of air to be uniform [1.3 kg/m³] and pressure at the surface of Earth to be 10⁵ Pa. (Also assume the Earth to be perfectly spherical and no variation in 'g' due to height.)

1. 6 km < h < 7 km

2. 5 km < h < 6 km

3. 7 km < h < 8 km

4. 8 km < h < 9 km

Q.

State Archimedes’ principle. Does it apply to gases?

Q.

The upthrust on a piece of wood held under water will be

1. less than the weight of the wood piece

2. more than the weight of the wood piece

3. Zero

4. Less than zero

Q.

State Archimedes principle.

Q.

Charge acquired by a glass rod is ______ when it is rubbed with a silk cloth.

Q.

State Archimedes principle.

Q.

Can an object with less density but huge weight, sink?

1. True
2. False

Q.

An iceberg floats with ______of its volume below ______.

Q. It is given that both liquid A and liquid B exert the same amount of pressure on their respective bases. The density of liquid A is twice the density of liquid B. The height of the column of liquid B is $10cm$. What would be the height of the column of liquid A?

1. $10cm$
2. $5cm$
3. $20cm$
4. $15cm$

Q. A container is placed on a table has four holes. The $\text{X}_\text{A}, \text{X}_\text{B}, \text{X}_\text{C}$ and $\text{X}_\text{D}$ represent the horizontal distances covered by the liquid coming out from the holes $\text{A}, \text{B}, \text{C}, $ and $\text{D}$ respectively. Which of the following options is correct?

Q.

According to Archimedes principle, what makes a body float in a liquid?

1. Buoyant force

2. Cohesive force

3. Viscous force

4. Pressure

Q. (i) Define the term relative density of a substance. What is its SI unit?
(ii) State the law of floatation.
(iii)Explain the meaning of the statement 'relative density of aluminium is 2.7'.

Q. In a bucket full of water, a block weighing $50N$ was immersed. Water weighing $5N$ is spilled out of the bucket. Calculate the buoyant force.

1. $4N$
2. $5N$
3. $6N$
4. $8N$

Q.

If two balls one of iron and the other of aluminum experiences same upthrust when dipped in water then, ___.

1. both have equal volume.

2. both have equal weight in air.

3. both have a different volume.

4. both have the same mass.