Tamil Nadu Board of Secondary EducationSSLC (English Medium) (5 to 8) Class 8

Which one of the following element name is not derived from planet? - Science


Which one of the following element name is not derived from planet?


  • Plutonium

  • Neptunium

  • Uranium

  • Mercury




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Chapter 9: Matter around us - Exercises [Page 101]


Tamil Nadu Board Samacheer Kalvi Class 8th Science Answers Guide
Chapter 9 Matter around us
Exercises | Q I. 3. | Page 101


A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Fill in the blank:

The change of a solid into a liquid is called melting or................

Give reason for the following.

Pure substances have fixed melting or boiling points.

 Give reason:
When an empty gas jar is inverted over a gas jar containing a coloured gas, the gas also spreads into the empty jar.

 Fill in the blank:

Water is a matter because it has mas and occupies....................

Fill in the blank:

Liquids have a definite ............

Write whether the following statement is true or false.
If the container in which a gas is collected has an opening, the gas will flow out and spread itself indefinitely.

Write whether the following statement  is true or false.
The intermolecular force of attraction is the weakest in gases.

Write true or false for statement. Rewrite the false statement correctly.

Solids can be compressed easily.

Give two examples of the following:

Substances which do not change their states.

What is mass ?

If an object is taken to the moon from the earth what will be its mass ?

What is the relation between intermolecular space and intermolecular force ?

Give reason Liquids can flow easily 

Fill in the blank

Molecules in a ________ are packed very closely.

A solid is a state of matter that has

Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

Fill in the following blank with suitable words :

The smell of perfume gradually spreads across a room due to .....................

Explain the following :

When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.

What is meant by 'diffusion'? Give one example of diffusion in gases.

Which one of the following statement is correct in respect of fluids?

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

  1. increasing pressure on hydrogen contained in a closed container
  2. some hydrogen gas leaking out of the container
  3. increasing the volume of the container of hydrogen gas
  4. adding more hydrogen gas to the container without increasing the volume of the container

Which of the following statement is incorrect?

When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.

  1. What could particles X be ?
  2. Name the gas (or mixture of gases) Y.
  3. What is the phenomenon exhibited by particles X known as ?
  4. What is causing the movement of particles X ?
  5. What conclusion does the existence of this phenomenon give us about the nature of matter ?

Define: diffusion

 Define: interconversion of states of matter.

What are the two conditions for the interconversion of states of matter?

Give reasons for the following:

Solids have a definite shape and are highly rigid while gases have to definite shape and are least rigid.

Give reasons for the following:

Sugar can be distinguished from talcum powder using water.

Give reasons for the following:

Water on freezing turns into ice.

Give reasons for the following:

A bottle of perfume on opening evolves an odour which can be sensed over a long distance.

Complete the statement given below by selecting the correct word.

The space between atoms in gases is maximum while in ____ is minimum,

Fill in the blank with the correct word Given below.

The space between atoms’ [molecules] of solids is ____

Name the three states of matter.

Differentiate the general properties of solids, liquids and gases in the form of a table — with reference to space.

State in which of the three states of matter:

The movement of the particles is neither about their own positions nor in any random direction.

Describe simple experiment to show that particles of matter are closely packed in solids and less in liquids.

Complete the statement by filling the blank with the correct word given below.

When inter-particle space increases, the inter-particle attractive force _______________.

200 ml of water is poured into a bowl of 400 ml capacity. The volume of water will be ______.

Among the following ______ is not a mixture.

Water obtained from tube wells is usually ______ water.

Air is not compressible.

Match the following.

Property Example
Breaks easily (Brittle) Metal pan
Bends readily Rubber band
Can be stretched easily Cotton wool
Gets compressed easily Mud pot
Gets heated readily Plastic wire

Mr. Raghu returns home on a hot summer day and wants to have buttermilk. Mrs. Raghu has the only curd. What can she do to get buttermilk? Explain

In a glass containing some water, tamarind juice and sugar are added and stirred well. Is this a mixture? Can you tell why? Will this solution be sweet or sour or both sweet and sour?

The Cow and Birds are nonliving things.

Mention any two characteristics of the particles of matter.


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