MCQ PRACTICE 1

Welcome to your Ncert - class 9- science - Chapter 1 – Matter in Our Surroundings 1

Which one of the following statement is correct ?

Both boiling and evaporation are bulk phenomena.

Boiling is a surface phenomenon, but evaporation is a bulk phenomenon

Both boiling and evaporation are surface phenomena.

Boiling is a bulk phenomenon, but evaporation is a surface phenomenon

None

The molecules:

in a liquid move within its boundary.

in a gas move only within its boundary.

in solid, liquid and gas move freely anywhere.

in a solid move freely within its boundary.

None

During change of state of matter, the temperature remains the same due to:

latent heat

less supply of heat

lattice energy

loss of heat

None

Statement I : Evaporation causes cooling.

Statement II: Particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation.

Both statements I and II are true, statement II is not the correct explanation for statement I.

Statement I is false and statement II is true.

Both statements I and II are true, statement II is correct explanation for statement I.

Statement I is true and statement II is false.

None

What is the effect on the chemical and physical properties of water when the temperature is changed?

Both chemical and physical properties of water change with a temperature change.

The chemical properties of water remain the same but the physical state changes with a temperature change.

The chemical properties of water change with temperature change but physical properties remain the same.

There is no effect on the chemical or physical properties of water when the temperature is changed.

None

Select the correct alternative

The molecules can move freely anywhere in_____ state.

gaseous

solid

liquid

none of the above

None

A fully inflated balloon goes higher in the atmosphere, so what will be the pressure outside and inside the balloon respectively.

Decreases, Remains constant

Decreases, Increases

Increases, Decreases

Increases, Remains constant

None

The temperature of melting ice remains constant for some time even if we continue to supply heat to the beaker. This is because of the heat energy ?

is radiated out

is used to bring the particles of matter closer

is used to change the pressure on the particles

is used to overcome the forces of attraction between the particles

None

Which among the following have moderate intermolecular forces?

Equal in liquids and gases both

Solids

Gases

Liquids

None

10.

The process by which molecules undergo a spontaneous transition from the liquid phase to the gaseous phase is called as:

freezing

sublimation

evaporation

condensation

None

11.

Latent heat is evolved during the transformation of liquids into solids.

How will you explain this statements?

None of the above

Heat does not get absorbed nor released

Heat is released and temperature decreases

Heat is absorbed and temperature increases

None

12.

Match Column I with Column II and select the correct option from the codes given below

Column I	Column II
(a) Drying of clothes on a windy day	(i) Time taken for evaporation increases
(b) Liquefaction of gases	(ii) Decreasing pressure and increasing temperature
(c) Change in state of dry ice from solid to gas	(iii) Increasing pressure and decreasing temperature
(d) Less cooling effect of sweating in coastal areas	(iv) Rate of evaporation increases

a - (iv), b - (iii), c - (ii), d - (i)

a - (iv), b - (iii), c - (i), d - (ii)

a - (i), b - (ii), c - (iii), d - (iv)

a - (iii), b - (iv), c - (ii), d - (i)

None

13.

Which of the following is a correct statement?

The inter-particle force of attraction between the molecules in a liquid is less when compared to solids.

There is no inter-particle force of attraction between the molecules in a liquid.

The inter-particle force of attraction between the molecules in a liquid is either more or less when compared to solids.

The inter-particle force of attraction between the molecules in a liquid is more when compared to solids.

None

14.

The percentage of para hydrogen in ordinary hydrogen increases when?

Pressure is increased and temperature is decreased

None

Temperature is lowered

Temperature is increased

None

15.

The heat gained or lost during a change of state from solid to liquid or from liquid to solid is called the latent heat of .......

vaporisation

fusion

freezing

condensation

None

16.

Identify the correct statement about gases:

Gases occupy the entire space of the container.

Gases can not flow.

Gases can not be compressed easily.

Gases have definite shapes.

None

17.

Evaporation of a liquid takes place at:

a fixed temperature higher than its boiling point.

a fixed temperature and pressure.

all temperatures.

any temperature lower than its boiling point.

None

18.

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

Only liquids behave as fluids

Gases and liquid behave as fluids

Only gases behave as fluids

Gases and solids behave as fluids

None

19.

Evaporative cooling is the phenomenon _____________.

in which density of liquid changes

none of these

in which molecule of liquid with high kinetic energy evaporates quickly, leaving behind the particle of less kinetic energy

in which molecule of liquid with low kinetic energy evaporates quickly, leaving behind the particle of high kinetic energy

None

20.

Which of the following is the BEST indicator of the actual amount of water vapour in the air?

Relative humidity

Dew point temperature

Air temperature

Saturation vapour pressure

None

Chapter 1 Matter In Our Surroundings

Chapter 2 – Is Matter Around Us Pure

Chapter 3 – Atoms and Molecules

Chapter 4 – Structure of the Atom

Curriculum

Ncert Class9-Chemistry-Science

Chapter 1 Matter In Our Surroundings

Chapter 2 – Is Matter Around Us Pure

Chapter 3 – Atoms and Molecules

Chapter 4 – Structure of the Atom

MCQ PRACTICE 1