Application of The Principle of Flotation

Q. Why does dead body float on water ?

Q.

If the density of the object placed in a liquid is equal to the density of the liquid, the object will:

1. Float half immersed

2. Float wholly immersed

3. Sink

4. Float completely above the liquid

Q.

A rubber ball floats on water with its $\frac{1}{3}rd$ volume outside water. What is the density of rubber ?

Q.

Two metallic spheres of different materials are completely immersed in water experience equal upthrust. Then both the spheres have equal

1. densities

2. volumes

3. masses

4. weights in air

Q.

What causes capillarity?

Q.

A body of weight W is floating in a liquid. Its apparent weight will be :
(a) equal to W

(b) less than W
(c) greater than W

(d) zero.

Q.

An iron nail sinks in water while an iron ship floats on water.

Explain the reason.

Q. Why does a nail made of iron sink in water whereas a ship made of iron does not?

Q.

A loaded cargo ship sails from sea water to river water ? State and explain your observation.

Q.

A balloon lifting in air follows the following principle

1. Law of gravitation

2. Archimedes principle

3. Principle of buoyancy

4. All of the above

Q.

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

1. It just touches the surface of the liquid.

2. It is partially immersed in the liquid.

3. It is completely immersed in the liquid.

4. It is partially immersed and also touches the sides of the container.

Q.

State of the law of floatation.

Q.

Why ship made of iron and steel floats in water whereas a small piece of iron sinks in it. Explain.

Q.

When a body is full immersed in a liquid, it undergoes an apparent:

1. loss in it mass

2. loss in its weight

3. no loss any respect

4. loss in its volume

Q.

Why is the floating ice less submerged in brine than in water ?

Q.

A body of mass $100g$is floating in the water. What will be its apparent weight? Justify your answer.

Q.

A body of weight $1\mathrm{k}\mathrm{g}\mathrm{f}$ is floating in the water what is the apparent weight of the body in water?

Q.

Copper floats on mercury but sinks in water. Which statement given below is true?

1. Mercury is heavier than copper but lighter than water.

2. Copper and mercury both are heavier than water.

3. Copper is lighter than water but heavier than mercury.

4. Water is heavier than mercury but lighter than copper.

Q. Question 13
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

(a) 2 N
(b) 8 N
(c) 10 N
(d) 12 N​​​​​​​

Q.

The figure shows a beaker containing mercury. If a rectangular iron bar of mass 850 g is dropped in the mercury contained in this beaker, what will be the apparent weight of the iron bar?

1. Equal to the weight of the displaced liquid

2. Zero

3. Can’t be determined

4. Less than the weight of the body (non-zero)

Q. A body is floating in a beaker filled with water. $1/3^{\text{rd}}$ of the body is inside the water and $2/3^{\text{rd}}$ is in the air as shown in the figure. What will be the density of the body.
${\rho }_w=\text{Density of water}$
${\rho }_b=\text{Density of the body}$ [$3\text{marks}$]

Q. A body of weight W is floating in a liquid. Its apparent weight will be :

1. equal to W
2. less than W
3. greater than W
4. zero.

Q.

A kilogram of cotton will weigh ___________in air than in vacuum.

Q.

Why does a ship float in water even though it is made of steel of a density greater than the density of seawater?

Q.

An iron block _____________________ in water . (sinks/floats)

Q.

Buoyancy, What is the logic behind ‘iceberg’ is regarded as a being danger to ship?

Q.

A common hydrometer is set up in a laboratory, by using a test tube and some lead shots. State two defects in this hydrometer.