Tag: properties of materials

Questions Related to properties of materials

Find the odd man out in terms of material it is made of:

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

  1. Rubber

  2. Gold

  3. Coal

  4. Chalk

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Correct Option: B
Explanation:

Coal, chalk and rubber all are non-metals but gold is metal with lustre and is the good conductor of heat and electricity whereas non-metals are bad conductors of heat and electricity.

Which of the following has dull appearance?

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

  1. Gold foil

  2. Aluminium foil

  3. Steel rod

  4. Bricks

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Correct Option: D
Explanation:

The appearance of an object depends on color, hardness, texture, and luster of its material. Materials which are made up by non-metals have dull appearance eg. bricks.

Select the metal which is hardest among the following:

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

  1. silver

  2. gold

  3. platinum

  4. aluminium

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Correct Option: C
Explanation:

As the size of the metal increases, they become harder.

So, size of the metals- $Al < Ag < Au < Pt$
As we move across the period size decreases hence $Pt>Au$. 
$\therefore$ $Pt$ is hardest.

Which among the following is the softest metal?

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

  1. Platinum

  2. Silver

  3. Iron

  4. Aluminium

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Correct Option: D
Explanation:

As the size of the metal increases its softness decreases.

So, the increasing size of the given metals-
$Al < Fe < Ag < Pt$
Hence, $Al$ is the softest metal among these.

Most balloons, tires, and footballs are made of rubber. This is because rubber is:

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

  1. naturally available

  2. cheap

  3. an electrical insulator

  4. soft and flexible

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Correct Option: D
Explanation:

Rubber is a ploymer which a naturally available cheap ploymer which is extracted from rubber trees.It is used to prepare ballons,tires and footballs because rubber is both soft and flexible.

Which of the following is lustrous?

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

  1. Steel furniture

  2. Wooden furniture

  3. Plastic chair

  4. Football

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Correct Option: A
Explanation:

Different objects look different from each other according to their material they are made from. The appearance depends on color, hardness, texture, and lustre.  Metals are lustrous due to free electrons on their surfaces. Hence materials made of metals have lustre.

You are provided with the following four materials as wood, plastic, wool and steel. Which of the given material will you identify as hardest and softest respectively?

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

  1. Wood and wool

  2. Plastic and steel

  3. Wool and steel

  4. Steel and wool

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Correct Option: D
Explanation:

Materials which are difficult to compress are called hard and materials which are easy to compress are called soft.

Hard materials :Steel,wood,etc.
Soft materials :Wool,cotton etc.
Here steel >wood>wool [hardness]
So,steel is hardest and wool is soffest.

Find the odd one out on the basis of the appearance of an object.

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

  1. Paper

  2. Cardboard

  3. Iron

  4. Playing cards

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Correct Option: C
Explanation:

Paper cardboard,playing cards can be tampered or burnt i.e the level of hardness of these three objects is very low  while iron is very hard and cannot be tampered by bare hands.

Milk and water dissolve in each other. They are:

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

  1. immiscible liquids

  2. solvent and solutions

  3. miscible liquids

  4. None of the above

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Correct Option: C
Explanation:

The two liquid which can dissolve in each other and make a homogenous mixture is called miscible liquid.

Milk and water are miscible liquids.

Option (C) is correct.

Kerosene floats on water because :

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

  1. kerosene has more density

  2. kerosene has less energy

  3. densities of water and kerosene are equal

  4. water has more density

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Correct Option: D
Explanation:

Water is denser than kerosene. The density of water is $1000kg/m^3$ and kerosene is $810kg/m^3$

when something is less dense than the water then it floats on water. Thus kerosene floats on water.

Option D is correct.