Teacher's Resources

1. Matter

Click the correct answer (True or False).

The basic unit of human body,the cell, is made up of atoms only.

True

False

Liquids have a ﬁxed shape and a deﬁnite volume.

True

False

When the heat is supplied to the matter, its molecules gain energy and start vibrating vigorously.

True

False

During the process of evaporation, the liquids release heat from the body and causes the cooling of the body.

True

False

Camphor is an example of sublimate.

True

False

The temperature at which a liquid changes into its gaseous state is called the melting point.

True

False

Solids do not have a ﬁxed shape and take the shape of the container they are poured in.

True

False

During the change of state of a substance, the temperature increases abruptly.

True

False

The molecules possess kinetic energy which is a direct measure of the temperature of that substance.

True

False

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

True

False

Solids cannot be compressed easily when pressed.

True

False

Click the correct answer.

In which of the following is the intermolecular distance between molecules the maximum?

Solid

Liquid

Gas

Matter

What type of motion is shown by the molecules present in a gaseous substance?

They show no motion.

They show random motion.

They move about their own axis only.

They show translatory motion.

Which of the following statements is true for liquids?

They are more compressible than gases.

They are less compressible than solids.

They are more compressible than solids.

They are least compressible among the three states of matter.

Which of the following is not a valid postulate of kinetic theory of matter?

Molecules are in a state of continuous motion.

Kinetic energy increases with the increase in temperature.

Force of attraction between the molecules is called intermolecular force of attraction.

Intermolecular force decreases with decrease in intermolecular distance between molecules.

In which of the following processes a gas changes into its liquid state?

Condensation

Melting

Freezing

Vaporisation

Which of the following does not show sublimation?

Camphor

Dry ice

Common salt

Naphthalene

Click each box on the left and then click the matching box on the right.

Match the columns by dragging.

Intermolecular distance

SI unit of specific latent heat

Boiling point of iron

Boiling point of water

Melting point of ice

Maximum in gases

J kg^-1

2862 °C

100 °C

0 °C

Click the correct answer.

A/An is the smallest unit of an element which may or may not have an independent existence.

atom

molecule

compound

crystal

The space between the molecules of a substance is called .

intermolecular space

intermolecular attraction

interdependence

spacing

The molecules are in motion.

random

straight

constant

uniform

Gases have the intermolecular forces.

weakest

maximum

low

moderate

The state of matter composed of atoms packed tightly together is known as .

solid

liquid

gas

heat

When heat is liberated by matter, the energy of its molecules and they come closer.

increases

remains same

decreases

first increases then decreases

Solids have the intermolecular space among all the states of matter.

least

maximum

highest

circular

The temperature at which a gas changes into its liquid state is called the .

melting point

condensation point

freezing point

vaporisation point

is the state of matter in which the constituent molecules are very loosely packed.

Solid

Liquid

Gas

Water

Freezing is the opposite of .

condensation

melting

freezing

vaporisation

Sweat from our body evaporates by taking from the body.

temperature

smell

water

heat

At the condensation point, the temperature remains constant till the entire steam to water.

converted

heated

stored

maintained

If the water liberates energy, its temperature falls down till it reaches the point.

sublimation

condensation

freezing

vaporisation

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