Tag: properties of materials

Questions Related to properties of materials

The density of alcohol is 800 $ \displaystyle Kg/m^{3} $. Its relative density is:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. 8

  2. 0.8

  3. 0.08

  4. 800

Show answer
Correct Option: B
Explanation:
Relative density is the ratio of the density of the substance to the density of water.

We know that, density of water is $1 gm/cm^3   = 10^3 kg/m^3$

So, relative density of alcohol = $\dfrac{800}{1000}$ = $0.8$

Hence, option B is correct.

Solubility is the amount of the .................... present in the saturated solution at a particular temperature.

chemistry nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. solute

  2. solvent

  3. dispersed phase

  4. dispersed medium

Show answer
Correct Option: A
Explanation:

At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving, is said to be a saturated solution. In other words, when no more solute can be dissolved in a solution at a given temperature, it is called a saturated solution. The amount of the solute present in the saturated solution at this temperature is called its solubility.

The amount of the solute present in the saturated solution at a particular temperature is called its :

chemistry nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. solubility

  2. saturation

  3. solvent concentration

  4. none of the above

Show answer
Correct Option: A
Explanation:

At any particular temperature, a solution that has dissolved as much solute as it is capable of dissolving is said to be a saturated solution.


The amount of solute present in the saturated solution at this temperature is called its solubility.

Hence, option A is correct.

A block of iron (density 9.8 $ \displaystyle g/cm^{3}) $ if added in mercury (density 13.6 $ \displaystyle g/cm^{3} $ ) will:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. sink

  2. float

  3. neither float nor sink i.e. remain suspended in mercury

  4. none of these

Show answer
Correct Option: B
Explanation:

The average density of the object should be less than the density of the fluid in which the object has to float.


The density of object (iron) is less than the fluid (mercury).

Therefore, it will float.


Hence, option B is correct.

A block of aluminium of density 2.75 $ \displaystyle g/cm^{3} $ has a volume of 30$ \displaystyle cm^{3} $. The mass of the block is:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. $27$ gm

  2. $18 $ gm

  3. $82.5$ gm

  4. $810$ gm

Show answer
Correct Option: C
Explanation:

Mass $=$ Density $\times$ Volume

So, Mass of aluminium $=2.75 \times 30 = 82.5\  gm$
Hence, option $C$ is correct.

A block of wood has mass 200 kg. If the density of wood is 800 $ \displaystyle kg/m^{3} $, its volume will be:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. 0.25 $ \displaystyle  m^{3} $

  2. 25 $ \displaystyle  m^{3} $

  3. 250$ \displaystyle  cm^{3} $

  4. none of these

Show answer
Correct Option: A
Explanation:
Volume = Mass/ Density
So, volume of wood = 200/800 = 0.25 $m^3$

Identify the materials from the following which float in water: 

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. wax, iron nails, sponge

  2. plastic, wood, oil

  3. ice, oil, sand

  4. honey, thermocol, keys

Show answer
Correct Option: B
Explanation:

Things which are lighter than water or less dense than water will not sink in water eg. plastic, wood, and oil.

Opaque objects:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. does not transmit most of the light falling on them

  2. transmit most of the light falling on them

  3. absorb most of the light falling on them

  4. are strong and hard

Show answer
Correct Option: C
Explanation:

An opaque object is neither transparent (allowing all light to pass through) nor translucent (allowing some light to pass through). When light strikes an interface between two substances, in general, some may be reflected, some absorbed, some scattered, and the rest transmitted. 

Transparent substances:

evs nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. absorb all the light incident on them.

  2. allow light to pass through them.

  3. do not allow light to pass through them.

  4. allow light to pass through them only partially.

Show answer
Correct Option: B
Explanation:

Transparent substances allows the light to pass through them. Due to this it is possible to see through the transparent substances. 

Example: We are able to see through the some glasses because they are transparent.

Which of the following is translucent?

chemistry nature of things properties of materials grouping and classification of objects sorting materials into groups

  1. Copper

  2. Wood

  3. Butter paper

  4. Glass

Show answer
Correct Option: C
Explanation:

The material through which light can pass partially is called translucent, e.g. butter paper, thin curtain, tinted glass etc.