Density

Q.

The density of a piece of clay is 1.8 in CGS system of units . The corresponding value in SI unit of system is?

Q.

The density of aluminium is 2.7 g $c{m}^{-}3$. Express it in kg $m^{-}3$.

Q.

Explain why an iron needle sinks in water, but a ship made of iron floats on water.

Q.

The density of brass is 8.4 g $c{m}^{-}3$. What do you mean by this statement?

Q.

The mass of an empty density bottle is $30g$, it is $75g$ when filled completely with water and $65g$ when filled completely with a liquid. Find: a) volume of density bottle b) density of liquid and c) relative density of liquid

Q.

Define the term density of a substance.

Q.

How do you calculate the linear density of a string?

Q.

How is the apparent weight of the floating body 0?

Q. The measured values of mass, length, breadth and thickness of a rectangular block are 39.3g, 5.12 cm, 2.56 cm and 0.37 cm respectively. Find the maximum permissible percentage error in the determination of the density of the material of the block.

Q.

A piece of wood of mass 150 g has a volume of 200 $c{m}^3$.Find the density of wood in

(a) C.G.S.unit (b) S.I unit

Q.

What do you mean by this statement :

The density of iron is 7.8gm cm^-3

Q.

A piece of iron of density $7.8\times {10}^{3}kg{m}^{-3}$ and volume 100 $c{m}^3$ is totally immersed in water ($\rho$ = 1000 kg $m^{-3})$. Calculate its apparent weight in water.

1. 6 N

2. 1 N

3. 6.8 N

4. 7 N

Q.

Arrange the following substances in order of their increasing density:

Iron, Cork, Brass, Water, Mercury.

Q.

Write true or false for each statement:

(a) Equal volumes of the two different substances have equal masses.

(b) The density of a piece of brass will change by changing its size or shape.

(c) The density of a liquid decreases with an increase in its temperature.

(d) Relative density of water is 1.0.

(e) Relative density of a substance is expressed in g $c{m}^{-}3$.

(f) When a body is immersed in a liquid, the buoyant force experienced by the body is equal to the volume of the displaced by it.

(g) A body experiences the same buoyant force while floating in water or alcohol.

(h) A body experiences the same buoyant force when it floats or sinks in water.

(i) A body floats in a liquid when its weight becomes equal to the weight of the liquid displaced by its submerged part.

(j) A body while floating sinks in a liquid of low density than in high density.

Q.

How will you determine the density of irregular solids that are insoluble in water

Q.

The density of alcohol is 600 kg $m^{-}3$. Express it in g $c{m}^{-}3$.

Q.

A piece of iron sinks into water while a wooden piece float. Why is it so ?

Q.

Iron sinks in water and floats in mercury.

Density of Iron - $7.6g/c{m}^3$

Density of Water - $1g/c{m}^3$

Density of Mercury - $13.7g/c{m}^3$

1. True

2. False

Q.

The diagram given below shows a body floating in three different liquids A, B and C at different levels.

(a) In which liquid does the body experience the greatest buoyant force?

(b) Which liquid has the least density?

(c) Which liquid has the highest density?

Q.

The density of gold is 19.5 g cm-3 and that of silver is​

10.5 g cm-3. The correct statement is:

1. The volume of certain mass of gold is more than the volume of equal mass of silver.
2. Equal volumes of gold and silver have equal masses.
3. The mass of certain volume of gold is more than the mass of equal volume of silver.
4. Equal masses of gold and silver have equal volumes.

Q.

A given quantity of a liquid is heated. Which of the following quantity will vary and how?

(a) mass (b) volume and (c) density.

Q.

The dimensions of a hall are $10\times$ $7m\times$ $5m$. If the density of air is 1.11 kg$m^{-}3$. Find the mass of air in the hall.

Q.

Differentiate between a graduated cylinder and a eureka can.

Q. What is neutral buoyancy ?

Q.

Show the following in the form of a flowchart.

Measuring the density of a liquid with unknown mass and volume.

Q.

Why does a piece of ice float on water?

Q. Volume is the three dimensional space occupied by a solid, liquid or gas and it is measured by the unit .

1. $m^3$
2. $m$
3. $m^2$

Q.

Why is the buoyant force equal in different liquids with same object?

Q.

Ice floats over water although it is solid. Why?

Q.

calculate the density and relative density of a brine solution

mass of empty density bottle= 22 grams

mass of bottle + water = 50 grams

mass of bottle + brine solution = 54 grams