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# Selina solutions for Class 6 Physics chapter 1 - Matter

## Chapter 1: Matter

#### Chapter 1: Matter solutions [Page 0]

Write true or false for statement

The molecules of each substance are identical.

Write true or false for statement

The inter-molecular forces are effective at all distances between the two molecules.

Write true or false

The molecules in a substance arc in random motion.

Write true or false

In a gas, the molecules can move anywhere in space. .

Write true or false

The liquids are less viscous than the gases.

Fill in the blank

All the molecules of a substance are .............

Fill in the blank

The inter-molecular spacing is .......... in solids ...........in liquids and ...............in gases.

Fill in the blank

The molecular motion in liquid and gas is in................. path.

Fill in the blank

In a solid, the molecules............................................ but they remain at their fixed positions.

Fill in the blank

The inter-molecular forces are the weakest in ...............

Fill in the blank

A solid exerts pressure .....................

Fill in the blank

The gases are .......... dense.

Fill in the blank

A solid is ............ rigid.

Select the correct alternative

The diameter of a molecule is approximately

1.  1 cm
2.  10 cm
3.  10-10 m
4.  1 m

Select the correct alternative

The inter-molecular forces are strongest in

1.  solids
2.  liquids
3.  gases
4.  both (i) and (ii)

Select the correct alternative

The molecules

1.  in solid, liquid and gas, move freely anywhere.
2.  in a solid, move freely within its boundary.
3.  in a liquid, move within its boundary.
4.  in a gas, move only within its boundary.

Select the correct alternative

The solids are

1.  more dense
2.  less dense
3.  least dense
4.  highly compressible

Select the correct alternative

The inter-molecular forces in liquids are

1.  as strong as in solids
2.  stronger than in solids
3.  weaker than in solids
4.  weaker than in gases

Match the following columns

 Column A Column B A. A molecule is composed of i. does not exist free in nature B. Ice , water and  water vapour ii. can vibrate only up to about 10^-10m from their mean  position C. An atom iii.atoms. D. Gases iv. are the three states of water . E. The molecules of a solid v. occupy space

#### Chapter 1: Matter solutions [Page 0]

Define matter. What is its composition ?

Name the three states of matter.

What is a molecule ?

What is the approximate size of a molecule ?

One litre of water has 6.02 × 1026 molecules. Estimate the size of a molecule.

What do you mean by inter-molecular spacing ?

Describe a simple experiment to illustrate the existence of inter-molecular spacing.

What do you mean by inter-molecular forces ?

What are the forces of cohesion and adhesion ?

State three characteristics of molecules of matter.

State the approximate spacing between two molecules of a matter.

How do the solids, liquids and gases differ in their following properties .
(a) Size
(b) Shape
(c) Density

The molecules in a substance are in motion. What type of path do they follow ?

Describe a simple experiment to illustrate that molecules are not at rest, but they constantly move.

Write down five general properties of solids, liquids and gases.

Give the molecular model for a solid and use it to explain why a solid has a definite volume and a definite shape.

Describe the molecular modcl for a liquid. I-low does it explain that a liquid has no definite shape, but has a definite Volume ?

A gas has neither a definite volume nor a definite shape. Describe the molecular model to explain it.

Distinguish between the three states of matter—solid, liquid and gas on the basis of their molecular models.

Distinguish between solids, liquids and gases on the basis of their following properties :
(a) compressibility
(b) fluidity
(c) rigidity
(d) expansion on heating

What do you mean by the change of state of matter ?

Explain the change of a solid into a liquid at a constant temperature .

Explain the change of a liquid into a gas at a constant temperature.

#### Chapter 1: Matter solutions [Page 0]

Define matter.

What is volume ?

What is mass ?

If an object weighs 6 kg on earth. What will be its weight on moon ?

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

Name the smallest particle from which matter is made up.

What are molecules ?

Give one difference between atoms and molecules.

Define Intermodular force of attraction.

Define Intermodular space.

Classify the following into solids, liquids and gases. Oxygen, milk, common salt, wax, stone, water vapour, carbon-dioxide, sugar, mercury, coal, blood, butter, copper, coconut oil, kerosene.

Why do solids, liquids and gases differ in their physical states?

What are fluids? Give two examples.

Define interconversion of states of matter.

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

How a liquid changes into its gaseous state ? Explain ?

Water cycle is an example of inter conversion of states of water. Explain.

State the general properties of a solid.

What is the relation between intermolecular space and intermolecular force?

Why liquids do not have a definite shape?

What happens when a solid is heated ?

Give reason for the  Gases can be compressed easily .

Give reason for the  Liquids can flow easily.

Give reason for the We need to classify things.

Give reason for the Pure substances have fixed melting or boiling points.

Give reason for the Electricity is not considered matter.

Define Matter.

Define  Intermolecular force

Define Element.

Define Atom .

Define  Molecule .

Write your observation and conclusion for the following

When a small stone is gently dipped into a glass filled with water.

Write your observation and conclusion for the following:

When one of the balloons suspended to the metre scale is punctured while other remains inflated ?

Give reasons :
Why do liquids and gases flow but solids do not ?

Give reasons :

A gas fills up the space available to it.

Give reasons :

The odour of scent spreads in a room.

Give reasons :

We can walk through air.

Give reasons :

Liquids have definite volume but no difinite shape.

Give reasons :
When a teaspoon of sugar is added to half a glass of water and stirred, the water level in the glass does not rise.

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.

Give reason :

A red ink drop added to small amount of water in a glass turns water red in some time.

Differentiate between the following.
Liquids and gases

Differentiate between the following.

Atoms and molecules

#### Chapter 1: Matter solutions [Page 0]

Fill in the blank

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

Fill in the blank

Any matter which has a definite ................. but no definite shape is called a...............

Fill in the blank

......... can flow.

Fill in the blank

The molecules are at a greater distance in ........ compared to liquids.

Fill in the blank

Water boils at .............

Fill in the blank

The physical state of a substance, which has a fixed volume but no fixed shape is...............

Fill in the blank

All matter is made up of tiny particles called .................

Fill in the blank

Liquids have a definite ............

Fill in the blank

The temperature at which a liquid boils is called the ................. point of that liquid.

Fill in the blank

Molecules in a ............ are packed very closely.

Fill in the blank

Liquids have no definite ...........

Fill in the blank

When a gas is cooled, its molecules .............. energy.

Fill in the blank

Matter is anything that has ..........and occupies...........

Write whether the following statement are true or false.

Only water can exist in three different states.

Write whether the following statement  are 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 are true or false.

Solids have the largest inter-molecular space.

Write whether the following statement are true or false.

There is no difference between evaporation and boiling.

Write whether the following statement are true or false

All solids, on heating, first change to the liquid and then to the gaseous state always.

Write whether the following statement are true or false.

The intermolecular force of attraction is the weakest in gases.

Write whether the following statement are true or false.

A gas has no free surface.

Write whether the following statement are true or false.

Intermolecular force of attraction is greater in gases than in liquids.

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

Matter cannot exist in different states.

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

If the intermolecular space is more than the intermolecular force will be weaker.

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

Solids and liquids can flow.

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

Solids can be compressed easily

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

The smallest part of an element capable of independent existence is called an atom.

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

The intermolecular space in a gas is almost negligible.

For  the following statements, say whether it describes a solid, a liquid or a gas.

For  the following statements, say whether it describes a solid, a liquid or a gas.

Particles are quite close together.

For  the following statement, say whether it describes a solid, a liquid or a gas.

Particles are far apart and move in all directions.

Match the following

 Column A Column B (a) Solids (i) Can flow in all directions (b) Sublimation (ii) The temperature at which a liquid change into its gaseous state. (c) Boiling point (iii) Any number of free surfaces . (d) Gases (iv) Gaps between particles . (e) Intermolecular space (v) Changes of state from solid to

Match the columns.

 1. iron and gold a. molecules are very far apart 2. melting b. pure substance 3. intermolecular space c. non- metals 4. compound d. the space between the molecules 4. gases e. changes from solid to liquid
 f. metals

Name the phenomenon which cause the following change.

Formation of water vapour from water.

Name the phenomenon which cause the following change.

Disappearance of camphor.

Name the phenomenon which cause the following change.

Conversion of ice into water.

Name the phenomenon which cause the following change.

Conversion of water into steam.

Give two examples for  of the following

Substances which sublime.

Give two examples for of the following

Substances which do not change their states.

Give two examples for of the following

Substances which are rigid and not compressible.

MULTIPLE CHOICE QUESTION

Which one is a kind of matter:

1.  light
2. petroleum
3.  sound
4.  heat

MULTIPLE CHOICE QUESTION

The state of matter which has no definite shape or volume is called

1.  solid
2.  liquid
3. gas
4.  water

MULTIPLE CHOICE QUESTION

There are large intermolecular gaps in

1.  water
2.  iron ball
3.  common salt
4. air .

MULTIPLE CHOICE QUESTION

All kinds of matter

1. occupy space and have definite mass
2.  have mass and definite shape
3.  can change their states
4.  have definite volume

MULTIPLE CHOICE QUESTION

A kind of matter which can sublime is

1.  water
2.  plastic
3.  milk
4. iodine

MULTIPLE CHOICE QUESTION

A substance which can change its state

1.  wood
2. oxygen
3.  paper
4.  cloth

MULTIPLE CHOICE QUESTION

The process by which a solid changes into a liquid is called

1.  freezing
2. melting
3.  condensation
4.  evaporation

MULTIPLE CHOICE QUESTION

A solid is a state of matter that has

1.  no definite shape.
2.  large intermolecular space.
3. high intermolecular force of attraction.
4.  no definite volume.

MULTIPLE CHOICE QUESTION

Which of the following is a property of the liquids ?

1. they can flow
2.  they are malleable
3.  they have a definite shape
4.  they are rigid

MULTIPLE CHOICE QUESTION

Gases

1.  cannot be compressed easily.
2. occupy the entire space of the container.
3.  have definite shapes.
4.  cannot flow.

## Selina solutions for Class 6 Physics chapter 1 - Matter

Selina solutions for Class 6 Physics chapter 1 (Matter) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CISCE Selina Concise Physics - Middle School for Class 6 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at shaalaa.com are providing such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 6 Physics chapter 1 Matter are Concept of Matter and And Composition, States of Matter - Solids, Liquids and Gases, States of Matter - Characteristics of Solids, Liquids and Gases (Shape, Texture and Volume)., Distinguishing Properties of Solids, Liquids and Gases..

Using Selina Class 6 solutions Matter exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 6 prefer Selina Textbook Solutions to score more in exam.

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