Tag: nature of things

Questions Related to nature of things

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

Show answer
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.

Name three materials that are lighter than water:

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Oil, wood and wax

  2. Iron silver and gold

  3. Sodium, potassium and aluminium

  4. Plastic, glass and wool

Show answer
Correct Option: A
Explanation:

Things which are lighter than water will float on water as oil, wood and wax.

Identify the material from the following which will not sink in water:

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Knife

  2. Coin

  3. Steel rod

  4. Tennis ball

Show answer
Correct Option: D
Explanation:

Coins, steel rod and knife made from metals are heavier than water hence sinks in water. A tennis ball is lighter than water hence float in water.

The ______ sinks in water while the _______ floats.

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. ship, boat

  2. paper, paper boat

  3. soap cake, soap case

  4. nail, hammer

Show answer
Correct Option: C
Explanation:

The soap cake sinks in water and the soap case floats because the soap cake is solid and doesn't have empty spaces so to float in water whereas soap case which have empty space in which soap settles that space is filled with air and air which is less denser than water helps the case to floats .

Find the odd one out on the basis of its density to that of water.

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. Human body

  2. Plastic Bottle

  3. Glass

  4. Ice

Show answer
Correct Option: C
Explanation:

Human body, plastic bottle and ice having low density than water can float on water whereas glass being denser than water hence sinks.

Which of the following sinks in water?

evs nature of things objects that float or sink substances that sink or float soluble and insoluble substances

  1. A boat

  2. A piece of paper

  3. A nail

  4. A stick

Show answer
Correct Option: C
Explanation:

A nail can sinks in water as it is denser and does not have space in it.


Boat and stick are made up of wood and its density is less than water and has spaces between the molecules and paper is also less dense than water so does not sink in water.