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 in respect of fluids?

Gases and liquid behave as fluids

Only gases behave as fluids

Gases and solids behave as fluids

Only liquids behave as fluids

None

Evaporation of a liquid takes place at:

a fixed temperature and pressure.

all temperatures.

a fixed temperature higher than its boiling point.

any temperature lower than its boiling point.

None

The molecules:

in a gas move only within its boundary.

in a solid move freely within its boundary.

in solid, liquid and gas move freely anywhere.

in a liquid move within its boundary.

None

Which among the following have moderate intermolecular forces?

Liquids

Gases

Equal in liquids and gases both

Solids

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

Increases, Remains constant

Increases, Decreases

Decreases, Increases

None

Statement I : Evaporation causes cooling.

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

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.

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

None

Evaporative cooling is the phenomenon _____________.

none of these

in which density of liquid changes

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

Which one of the following statement is correct ?

Both boiling and evaporation are bulk phenomena.

Both boiling and evaporation are surface phenomena.

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

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

None

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

How will you explain this statements?

None of the above

Heat is absorbed and temperature increases

Heat is released and temperature decreases

Heat does not get absorbed nor released

None

10.

Select the correct alternative

The molecules can move freely anywhere in_____ state.

none of the above

liquid

solid

gaseous

None

11.

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 overcome the forces of attraction between the particles

is used to change the pressure on the particles

is used to bring the particles of matter closer

None

12.

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

Relative humidity

Air temperature

Saturation vapour pressure

Dew point temperature

None

13.

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

evaporation

condensation

sublimation

freezing

None

14.

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

less supply of heat

loss of heat

lattice energy

latent heat

None

15.

Identify the correct statement about gases:

Gases occupy the entire space of the container.

Gases have definite shapes.

Gases can not flow.

Gases can not be compressed easily.

None

16.

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

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.

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

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

None

17.

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 .......

fusion

condensation

vaporisation

freezing

None

18.

The percentage of para hydrogen in ordinary hydrogen increases when?

Pressure is increased and temperature is decreased

None

Temperature is increased

Temperature is lowered

None

19.

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

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

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

None

20.

Which of the following is a correct statement?

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 more when compared to solids.

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 less when compared to solids.

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