MCQs of Science Chapter 1 Matter in our Surroundings

MCQs

Science

Chapter 1 Matter in our Surroundings

Class 9

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1. Ice floats on the surface of water because:

it is heavier than water

the density of both water and ice is the same

ice is lighter than water

none of these

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2. Evaporation of a material takes place

above its boiling point

above its melting point

below its boiling point

below its melting point

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3. Addition of impurities to water:

decreases the freezing point of water

increases the boiling point of water

does not affect the freezing or boiling point of water

both (a) and (b)

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4. Which one of the following statements is wrong for gases?

Gases do not have a definite shape and volume.

Volume of the gas is equal to the volume of the container confining the gas.

Confined gas exerts uniform pressure on the walls of container in all directions.

Mass of the gas cannot be determined by weighing a container in which it is enclosed.

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5. Which of the following states has the least energetic molecules?

Solids

Liquids

Gases

Plasmas

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6. A gas can be best liquefied

by increasing the temperature

by lowering the pressure

by increasing the pressure and reducing the temperature

none of these

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7. In which form, do the water molecules have less kinetic energy?

Ice

Water

Steam

All of them have equal kinetic energy

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8. When ice melts to water, then heat is

absorbed

evolved

no change

depends on conditions

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9. Two miscible liquids having different boiling points can be separated by:

sublimation

evaporation

fractional distillation

loading

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10. The diagrams show the arrangement of particles of a substance at temperatures 20°C and 40°C. What are the likely melting and boiling points of the substance?

mcqs-science-ch-01-01

Melting point/°C = -12, Boiling point/°C = 35

Melting point/°C = -25, Boiling point/°C = 45

Melting point/°C = -98, Boiling point/°C = 100

Melting point/°C = 44, Boiling point/°C = 80

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11. The quantity of matter present in an object is called its

weight

gram

mass

density

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12. Some crushed ice is put in a test tube and warmed. The ice melts because its particles

change their size

gain heat energy and escape

gain heat energy and become closer

gain heat energy and move away from their fixed positions

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13. Which of the following is an example of a solid-in-gas mixture?

Soil

Smoke

Moisture

Dew

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14. The electric bulb on long use forms a black coating on its inner surface. The process associated with this is

melting of tungsten

sublimation of tungsten

oxidation of tungsten

reduction of tungsten

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15. The inter-particle force are the strongest in

hydrogen

methyl alcohol

water

sodium chloride

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16. You can separate a mixture of sand, salt and water by:

filtration and distillation

decantation and evaporation

filtration and decantation

decantation and crystallization

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17. Which of the following represent the densest state of matter?

Solids

Liquids

Gases

Vapours

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18. A liquid is kept in a China dish. The evaporation of the liquid can be accelerated

by keeping the dish in the open

by blowing air into the liquid

by keeping the dish under a running fan

all of these

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19. To separate the solids which are insoluble in liquids such that solid is heavier than liquid:

sedimentation and decantation

evaporation and condensation

filtration

condensation and crystallization

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20. 450 K temperature may be written in Celsius scale as

278°C

450°C

0°C

177°C

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21. Which of the following indicates the relative randomness of particles in the three states of matter?

Solid > Liquid > Gas

Liquid < Solid < Gas

Liquid > Gas > Solid

Gas > Liquid > Solid

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22. The state of matter which consists of super energetic particles in the form of ionized gases is called

gaseous sate

liquid state

Bose-Einstein condensate

plasma state

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23. The substance with least inter-particle space is

methanol

acetic acid

copper

oxygen

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24. Which of the following is not correct regarding gases?

Gases exert pressure.

Gases have large intermolecular spaces.

Gases have weak tendency to diffuse.

Gases have weak intermolecular forces of attraction.

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25. Which of the following process(es) release(s) heat?

1. Condensation
2. Vaporisation
3. Freezing
4. Melting

Only 1

Only 4

1 and 3

2 and 4

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26. Which word describes the following change?
$I_{2(s)}$ → $I_{2(g)}$

Boiling

Condensation

Evaporation

Sublimation

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27. The value of latent heat of vaporisation of water kcal/kg is

80

540

334

225

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28. Which of the following statements is not correct?

Matter is continuous in nature.

Inter-particle spaces are maximum in the gaseous state of a substance.

Particles which constitute the matter follow a zigzag path.

Solid state is the most compact state of a substance.

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29. Which of the following has highest kinetic energy?

Particles of ice at 0°C

Particles of water at 0°C

Particles of water at 100°C

Particles of steam at 100°C

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30. Which of the following pair of gases cannot be separated by diffusion method?

SO_{2}

and

H_{2}

CO_{2}

and

NO_{2}

NH_{3}

and

N_{2}

CO_{2}

and

H_{2}

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31. Alcohol exists as a liquid at room temperature because

the intermolecular forces are strong enough to keep its particles bound to each other

its melting point is below room temperature

it is highly compressible

both (a) and (b)

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32. Which of the following statement is NOT true?

A mixture of water and milk can be separated by filtration.

A mixture of powdered salt and sugar can be separated by fractional crystallisation.

Loading is a process which involves alum.

Salt from sea water is obtained by evaporation.

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33. A saturated salt water solution was heated and allowed to cool without adding any more salt. What will happen?

Some salt appears to settle at the bottom.

Some more salt can be dissolved now.

No change takes place.

Both (a) and (b)

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34. Rate of evaporation of an aqueous solution decreases with increase in

wind speed

temperature

humidity

surface area

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35. Kinetic energy of molecules is directly proportional to

temperature

pressure

both (a) and (b)

atmospheric pressure

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36. Which of the following describes the liquid phase?

It has a definite shape and a definite volume.

It has a definite shape but not definite volume.

It has a definite volume but not a definite shape.

It has neither a definite shape nor a definite volume.

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37. Sugar syrup, usually used to coat sweets with sugar, becomes hard when cooled. From this we can conclude that sugar syrup is:

a saturated solution

an unsaturated solution

not a solution

none of these

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38. Filtration as a method of separation can be used for mixtures that are:

homogeneous and liquid-in-gas mixtures

heterogeneous and liquid-in-liquid mixtures

homogeneous and solid-in-liquid mixtures

heterogeneous and solid-in-liquid mixtures

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39. When liquid starts boiling, further heat energy which is supplied

is lost to the surroundings as much

increases the temperature of the liquid

increases the kinetic energy of the particles in the liquid

is absorbed as latent heat of vaporisation by the liquid.

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40. The state of matter which consists of super energetic particles in the form of ionized gases is called

gaseous state

liquid state

Bose-Einstein condensate

plasma state

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41. The process of evaporation causes:

heating

cooling

increase in temperature

none of these

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42. Which changes of state occur during distillation?

Boiling followed by filtration

Boiling followed by condensation

Condensation followed by boiling

Filtration followed by boiling

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43. Which of these choices is defined “Standard Pressure”?

14.7 psi

1 atm

760 torr

All of these

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44. Which of the following statements does not go with the liquid state?

Particles are loosely packed in the liquid state.

Fluidity is maximum in the liquid state.

Liquids cannot be compressed much.

Liquids take up the shape of any container in which they are placed.

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45. The evaporation of a liquid can be best carried out in a

beaker

China dish

test tube

flask

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46. The substance having the maximum tendency to flow is

water

sodium

sodium chloride

chlorine

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47. Which of the following decreases the rate of evaporation?

Surface area

Humidity

Temperature

Wind

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48. Which of the following statements about evaporation is incorrect?

1. It is bulk phenomena.
2. It is a fast process.
3. It takes place at all temperatures.

2 and 3

1 and 2

1 and 3

1, 2 and 3

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49. If a few spoons of salt are dissolved in pure water then

its boiling point becomes less than 100°C

its boiling point becomes more than 100°C

its freezing point becomes more than 0°C

none of these

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50. The forces of attraction between the particles of matter is maximum in

iron rod

kerosene oil

glycerine

dry air

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51. Which of the following mixtures will be the most difficult to separate?

Iron filings (powder) + sand

Sand + water

Sawdust + stones

Nitrogen + hydrogen

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52. Evaporation is directly proportional to

1. humidity
2. surface area
3. temperature
4. wind speed

1 and 4

2 and 3

3 and 4

2, 3 and 4

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53. Large volume of Compressed Natural Gas (CNG) is available in small cylinders to us due to its property of

high inflammability

easy availability

high compressibility

low density

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54. In an experiment oxygen was added to hydrogen and heated. On burning a substance containing both oxygen and hydrogen water was formed. What is this substance?

Element

Compound

Solution

Mixture

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