Density of a Fluid

Q.

The mass and volume of a body are $4.237g$ and $2.5c{m}^3$ respectively. The density of the material of the body in correct significant figures is.

Q.

The weight of a stone in air is 25 N and the weight of the stone when submerged in water is 20 N. What is the relative density of the stone?

1. 5

2. 4

3. 2

4. 6

Q.

Question 22
The volume of a 500 g sealed packet is $350c{m}^3$. Will the packet float or sink in water if the density of water is $1gc{m}^{-3}$? What will be the mass of the water displaced by this packet?

Q. Which of the following factors affect the upthrust acting on a body submerged in a fluid?

1. The density of the liquid
2. The volume of the body submerged
3. The mass of the fluid
4. The colour of the object submerged

Q.

Mass is the measure of quantity of matter contained in a substance.

1. True
2. False

Q.

A cubical block is dipped completely in water. Each edge of the block is 1 cm in length. Find the buoyant force.

Q.

If a piece of ice floating on the surface of water in a beaker melts completely, the level of water

1. Rises

2. Remains the same

3. Falls

4. Initially rises and then falls

Q.

Volume per unit mass is called density of a substance.

1. True
2. False

Q.

An object is put one by one in three liquids having different densities. The object floats with $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$9$}\right.$, $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$11$}\right.$, and $\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$7$}\right.$ parts of their volumes outside the liquid surface in liquids of densities $d_1$, $d_2$ and $d_3$ respectively. Which of the following statement is correct?

1. $d_1>d_2>d_3$

2. $d_1>d_2<d_3$

3. $d_1<d_2>d_3$

4. $d_1<d_2<d_3$

Q.

What do u mean by centre of buoyancy?

Q.

An empty container with its mouth closed has an average density equal to that of liquid. The container is taken 2 m below the surface of the liquid and is left there, then

1. the container sinks further.

2. the container will move up and down.

3. the container will bounce back to the surface.

4. the container remains where it is left.

Q.

Density is the product of mass and volume.

1. True
2. False

Q.

Buoyant force acting on a body due to different fluids is

1. same

2. different

3. zero

4. none of these

Q.

A body has relative density $7.8$. What will be its density in M.K.S units?

Q. You have a bag of cotton and an iron ball, each indicating a mass of 150 kg when measured on a weighing machine. Which one is heavier?

1. Both are equally heavy
2. Can't be determined
3. The iron ball is heavier than the cotton bag
4. The cotton bag is heavier than the iron ball

Q.

A solid body weighs $2.10N$ in air. Its relative density is $8.4$. How much will the body weigh if placed in:

1. Water
2. A liquid of relative density 1.2

Q.

The weight of piece of gold, alloyed with silver, is $0.02kgf$ in air and $0.0187kgf$ in water. If relative densities of gold and silver are respectively $19.3and10.5,$ how much gold is there in the piece?

Q.

Two solid blocks of identical size are submerged in water one block is lead and the other is aluminum upon which is the buoyant force greater?

Q.

Is the buoyant force on a submerged object equal to the weight of the object itself or equal to the weight of the liquid displaced by the object?

Q.

An object is thrown into a deep lake, as it sinks deeper and deeper into the water does the buoyant force upon it increase or decrease?

Q.

Density is higher when same mass is picked in large volume.

1. True
2. False

Q.

Density of a substance is defined as the ratio of the mass of a body to its _________

Q.

If the mass is measured in $g$ and the volume in $c{m}^3$, then what will be the unit of density?

Q.

Match the following:

Column A. Column B

1)Relative density of solid. (a)Mass of solid in air-Mass of solid. in water/Density of water

2)Volume of the solid. (b)Mass of solid/Volume of the solid

3)Density of a solid. (c)Wt.of solid in air/Wt.of solid in air -Wt of solid in water.

Q.

How is density denoted?

Q. Relative density of a body w.r.t. water is given by the ratio of to .

1. weight of the body
2. volume of water
3. density of the body
4. mass of water
5. density of water

Q. Density is represent by which symbol.

Q.

Define the term density .State its SI unit .

Q.

A jeweller claims that he makes ornaments of pure gold that has a relative density of $19.3$. He sells a bangle weighing $25.25g$to a person. The clever customer weighs the bangle when immersed in water and finds that it weighs $23.075g$in water. With the help of suitable calculations, find whether the ornament is made of pure gold or not.

Q.

An egg sinks in freshwater but floats in highly salty water. Give reason?