Kinetic Theory of Matter MCQ ICSE CLASS 8

Tick (✔) The correct choice amongest the following

1. The quantity of matter present in a substance is called its : (a) weight(b) gram(c) mass(d) density

2. Which of the following substance undergoes sublimation ? (a) sodium chloride(b) ammonium chloride (c) sugar(d) sand

3. What is the correct term for the phase changes from solid to gas directly ? (a) sublimation(b) liquefaction(c) fusion(d) vaporization

4. Evaporation of a liquid can take place : (a) at its boiling point(b) at all temperatures(c) below its boiling point(d) at a fixed temperature

5. Which of the following is not matter ? (a) humidity(b) fog(c) blood(d) boiling point

Answers

Tick (✔) The correct choice amongest the following

1. (c) mass

2. (b) ammonium chloride

3. (a) sublimation

4. (c) below its boiling point

5. (d) boiling point

Worksheet

A. Choose the correct answer.

1. When this form of energy is supplied to a substance, its molecules move faster and

hence their kinetic energy increases. Name the form of energy.

(a) Wind energy (b) Heat energy

(c) Light energy (d) Electrical energy

2. What is the force of attraction that exists between similar kinds of molecules called?

(a) Force of interparticle (b) Force of crossparticle

(c) Force of interpath (d) Force of cohesion

3. The distance between the molecules of a substance is called the ______________.

(a) intermolecular force (b) cohesion space

(c) intermolecular distance (d) crossparticle space

4. The intermolecular forces are almost negligible; due to this the molecules are very

loosely packed. Which state of matter is being talked about?

(a) Light (b) Gas (c) Liquid (d) Solid

1. Matter

5. They have no fixed shape but fixed volume. They take the shape of the container

they are poured in. Which state of matter is being talking about?

(a) Liquid (b) Gas

(c) Solid (d) None of the above

Answers to Worksheet

A. 1. (b) 2. (d) 3. (c) 4. (b) 5. (a)

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Write True Or False

1. The intermolecular forces in gases are weaker than in solids.

2. Liquids take the shape of the vessel.

3. All the three states of matter cannot be interconverted into one another.

4. The kinetic theory of matter explains the physical difference between solids, liquids and gases.

5. During the inter-conversion of states of matter, mass undergoes a change.

Answers

Write True Or False

1. False

2. True

3. False

4. False

5. True

Worksheet

B. State whether the following statements are True or False. Correct the false statements.

1. The force of attraction that exists between different types of molecules is called

force of adhesion.

2. The intermolecular force of attraction is directly proportional to the intermolecular

space.

3. Due to strong intermolecular forces, molecules are bound together. This is why

solids have a fi xed shape and size.

4. Due to large space between the molecules, liquids can be compressed more easily

than solids.

5. Solid is that state of matter in which the constituent molecules are the most loosely

packed.

Answers to Worksheet

B. 1. True

2. False

The intermolecular force of attraction is directly proportional to the intermolecular

space. (inversely)

3. True

4. True

5. False

Solid is that state of matter in which the constituent molecules are the most loosely

packed. (Gas)

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Select the Odd and Out Giving reason

1. Solid, liquid, gas, evaporation.

2. Condensation, sublimation, matter, freezing.

3. Melting, boiling, fusion, mass.

4. Density, volume, area, shape.

5. Element, atom, molecule, sublimation

Answers

Select the Odd and Out Giving reason

1. Evaporation : others are three states of matter.

2. Matter : others are changes of the states.

3. Mass : others are processes

4. Shape : others are physical quantities

5. Sublimation : it is a process

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Fill in The Blanks

1. Three states of matter are .................. , .................. and .....................

2. A vapour on cooling changes into .................. and on further cooling changes into .................

3. The molecules (particles) of solid are .................. packed.

4. A substance in the .................. state, has definite .................. but no definite .....................

5. There are two types of molecular forces in nature, .................. and .....................

Answers

Fill in The Blanks

1. solid, liquid, gas

2. liquid, solid

3. tightly

4. liquid, volume, shape

5. force of cohesion, force of adhesion

Worksheet

C. Fill in the blanks.

1. ________________ is the smallest unit of matter (substance) which can exist

independently and retains all physical and chemical properties of that substance.

2. Kinetic theory of matter given in the year 1860 states that matter is composed of a

large number of small particles called atoms which are in _____________________.

3. The molecules of matter always exert an attractive force on each other which is

known as ____________________ force.

4. Due to strong molecular attraction between the molecules, ______________ does

not cause appreciable expansion in solids.

5. On supplying heat to the matter, the molecules gain energy and they start

________________ vigorously.

Answers to Worksheet

C. 1. Molecule 2. continuous motion 3. intermolecular

4. heating 5. vibrating

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Match The Columns

1. 1.Solids frost 2.Evaporation surface phenomenondry 3.Ice crystals Dry ice 4.Sublimation DeW drops 5.Condensation definite shape and a definite size

Answers

Match The Columns

1. 1.definite shape and a definite size

2.surface phenomenon

3.frost

4.dry ice

5.dew drops

WORKSHEET

D. Match the columns.

Column A Column B

1. Matter (a) They have a definite volume but not a fixed shape. 2. Solids (b) The intermolecular forces are the weakest.

3. Gases (c) Change of a substance from one physical

state to another.

4. Liquids (d) Anything that has mass and occupies space

5. Change of state (e) The molecules do not move, but only

vibrate about their mean position

Answers to Worksheet

D. 1. (d) 2. (e) 3. (b) 4. (a) 5. (c)