Matter in Our Surroundings Class 9 MCQ

Class 9 Science Chapter 1 MCQ Matter in Our Surroundings

MCQ on Matter in Our Surroundings Class 9

Select and write the most appripriate option out of the four options for each of the question :

Question 1.
Take a 100ml beaker and fill it with water. Now add some salt to it and stir it. Then the water level will…
A) increase
B) decrease
C) not change
D) first increase and then decrease
Answer:
C) not change

Question 2.
Assertion (A) : Water level in a beaker does not rise when a spoon of sugar is added to it.
Reason ( R ) : There is a space between particles of water.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true and R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.
Answer:
A) Both A and R are true and R is the correct explanation of A.

Question 3.
From the given experiment we can say that…

A) The particles of matter are very big.
B) The particles of matter are very small.
C) The particles of matter vanish oh dilute:
D) The particles of matter increase on dilute.
Answer:
B) The particles of matter are very small.

Question 4.
Which of the following is a FALSE statement?
A) Particles of solid have no space between them.
B) Particles of liquid have space between them.
C) Particles of gas have space between them.
D) All the above statements are correct and no false statement.
Answer:
A) Particles of solid have no space between them.

Question 5.
Take two beakers A and B. Fill beaker A with cold water and beaker B with hot water. Drop a crystal of copper sulphate into them. Then rate of diffusion of copper sulphate is …..
A) More in beaker A than that of beaker B
B) More in beaker B than that of beaker A
C) Same in both beaker A and B
D) We cannot conclude anything
Answer:
B) More in beaker B than that of beaker A

Question 6.
In diffusion
A) Intermixing of particles takes place.
B) Reaction of particles takes place.
C) Repulsion of particles takes place.
D) Size of particles increases.
Answer:
A) Intermixing of particles takes place.

Question 7.
To show the diffusion, which of the following set of materials is not useful ? ( )
A) Water and blue ink.
B) Water and copper sulphate crystals.
C) Water and iron filings.
D) Incense stick and matchbox.
Answer:
C) Water and iron filings.

Question 8.
Which of the following statement is correct ?
i) Particles of any matter attract each other.
ii) The strength of the force of attraction between particles is equal for all matters.
A) i) only
B) ii) only
C) i) & ii)
D) None
Answer:
A) i) only

Question 9.
We cannot cut and divide the stream of water because ….
A) water particles attract each other.
B) water particles have no space between them.
C) both A and B
D) gravitational force acting on water particles.
Answer:
A) water particles attract each other.

Question 10.
In which of the substances do you think the particles are held together with greater force?
A) a piece of chalk.
B) a rubber band.
C) a wooden stick.
D) an iron nail.
Answer:
D) an iron nail.

Question 11.
The smell of hot sizzling food reaches us several metres away but not cold food because…..
A) smell of cold food diffuses faster.
B) smell of hot food diffuses faster.
C) smell of hot food and cold food diffuses in same rate.
D) smell of any food does not diffuse.
Answer:
B) smell of hot food diffuses faster.

Question 12.
Which of the following is not correct?
A) Particles of matter have space between them.
B) Partices of matter are continuously moving.
C) Particles of matter attracts each other.
D) Particles of matter diffuses continuously.
Answer:
D) Particles of matter diffuses continuously.

Question 13.
Why is a brick card soil? Because :
i) it has definite shape
ii) It has fixed volume
iii) it can compress.
A) i) only
B) ii) only
C) i) and ii) only
D) i), ii) and iii)
Answer:
C) i) and ii) only

Question 14.
Which of the following can be compressed ?
A) Solid
B) Liquid
C) Gas
D) B & C only
Answer:
D) B & C only

Question 15.
Which of the following has a fixed volume but no fixed shape?
A) Solid
B) Liquid
C) Gas
D) B & C only
Answer:
B) Liquid

Question 16.
Which phenomena is caused to dissolve oxygen in the air ?
A) diffusion
B) compression
C) dispersion
D) above all
Answer:
A) diffusion

Question 17.
Assertion (A) : The rate of diffusion of liquids is higher than that of solids.
Reason (R) : In the solid state particles move freely and have greater space between each other as compared to particles in the solid.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true and R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.
Answer:
A) Both A and R are true and R is the correct explanation of A.

Question 18.
A balloon seller fills a large number of balloons from a single cylinder of gas. Which property does help him?
A) Liquids have a fixed volume.
B) Gases can be compressed.
C) Diffusion of gases.
D) Above all.
Answer:
B) Gases can be compressed.

Question 19.
Observe the adjacent figure. What will happen if we fill water instead of gas in the syringe and push the piston?

A) Volume of the water decreases.
B) Volume of the water increases.
C) Volume of the water does not change.
D) Shape of the water changes.
Answer:
C) Volume of the water does not change.

Question 20.
CNG gas is used to….
A) cooking in our homes.
B) breathing gas in hospitals.
C) fuels for vehicles.
D) air to fill tyres of vehicles.
Answer:
D) air to fill tyres of vehicles.

Question 21.
Diffusion rate is more when …
A) Solid diffuses into liquids.
B) Solid diffuses into gas.
C) Liquid diffuses into liquids.
D) Gas diffuses into gas.
Answer:
D) Gas diffuses into gas.

Question 22.
Observe the adjacent figure. In which state the particles move about randomly at high speed? ( )

A) Solids
B) Liquids
C) Gases
D) None of the above
Answer:
C) Gases

Question 23.
Which is correct increasing order of their densities ?
A) Air < honey < water < chalk < iron.
B) Air < water < honey < chalk < iron.
C) Iron < chalk < honey < water < air.
D) Iron < chalk < water < honey < air.
Answer:
B) Air < water < honey < chalk < iron.

Question 24.
Ice floats on water because …………
A) Ice has a large space between its molecules than that of water.
B) Water has large space between its molecule than that of ice.
C) Number of molecules per unit area is more in ice than that of water.
D) None of the above
Answer:
A) Ice has a large space between its molecules than that of water.

Question 25.
Melting point is…..
A) The minimum temperature at which a solid melt to become a liquid.
B) The maximum temperature at which a solid melt to become a liquid.
C) The minimum temperature at which a liquid melt to become a gas.
D) The maximum temperature at which a liquid melt to become a gas.
Answer:
A) The minimum temperature at which a solid melt to become a liquid.

Question 26.

Substance	A	B	C	D
Melting point	600°C	273 K	1000°C	0°C

Which substance has more strength of the force of attraction between its particles ?
A) A
B) B
C) C
D) D
Answer:
C) C

Question 27.
When a solid melts, it’s temperature …
A) increases.
B) decreases.
C) remains constant.
D) first increases and then decreases.
Answer:
C) remains constant.

Question 28.
The melting point of a substance given in the graph are 15°C and 110°C, then at which point temperature is constant?

A) Point A and point C
B) Point B and point D
C) Point C and point D
D) No at any point
Answer:
B) Point B and point D

Question 29.
Which of the following particles have more energy at same temperature and pressure ?
A) Particles of ice.
B) Particles of water.
C) Particles of water vapour.
D) Above all particles have same energy.
Answer:
C) Particles of water vapour.

Question 30.
Which of the following represents steam of water?
A) 273 K
B) 370 K
C) 374 K
D) 100 K
Answer:
C) 374 K

Question 31.
Observe the below diagram and select the correct statement.

A) On cooling, the solid-state changes into a liquid state.
B) On heating, the gaseous state changes into a liquid state.
C) On heating, the solid-state changes into a gaseous state.
D) On cooling, the solid-state changes into a gaseous state.
Answer:
C) On heating, the solid-state changes into a gaseous state.

Question 32.
Sublimation means ….
A) Changing of liquid into gas directly.
B) Changing of gas into liquid directly.
C) Changing of solid into gas directly.
D) Changing of gas into solid directly.
Answer:
C) Changing of solid into gas directly.

Question 33.
What is the need of cotton plug in the experiment shown In the given figure?

A) It stops escaping gas.
B) It cools vapours.
C) It prevents oxidation.
D) It provides heat in the funnel.
Answer:
A) It stops escaping gas.

Question 34.
Which phenomena does takes place in the above experiment shown in the above figure ( Q.33 ) ?
A) Sublimation
B) Deposition
C) Both A and B
D) Evaporation
Answer:
C) Both A and B

Question 35.
From the above experiment given in the above figure (Q.33), we can separate the mixture of …
A) Ammonium chloride and salt.
B) Camphor and salt.
C) Camphor and sugar.
D) Above all.
Answer:
D) Above all.

Question 36.
Which of the following is needed to liquefy gases ?
A) Increasing pressure and decreasing temperature.
B) Increasing pressure and increasing temperature.
C) Decreasing pressure and increasing temperature.
D) Decreasing pressure and decreasing temperature.
Answer:
A) Increasing pressure and decreasing temperature.

Question 37.
What is the state of dry ice on decreasing its pressure to one atmosphere ? ( )
A) Solid
B) Liquid
C) Gas
D) A or B
Answer:
C) Gas

Question 38.
Observe the given figure and select correct option.
We can convert gas to solid by …

A) solidification
B) fusion
C) sublimation
D) deposition
Answer:
D) deposition

Question 39.
In which of the following situation change of state of liquid to vapour takes place without the liquid reaching the boiling point?
A) Water from the wet clothes while drying
B) Water over the floor after washing
C) Petrol from the container after open the lid.
D) Above all
Answer:
D) Above all

Question 40.
On rainy day rate of evaporation …
A) decreases
B) increases
C) no change
D) A or B
Answer:
A) decreases

Question 41.
In which condition rate of evaporation decreases ?
A) with an increase of surface area
B) with an increase of temperature
C) with an increase in humidity
D) with an increase in wind speed
Answer:
C) with an increase in humidity

Question 42.
Which of the following may decrease rate of change of evaporation ?
A) Spread out the wet clothes.
B) Put wet clothes inside of the room.
C) Put wet clothes under the fan.
D) Put wet clothes in sunlight.
Answer:
B) Put wet clothes inside of the room.

Question 43.
Saritha hanged wet clothes on a rope for drying. While drying clothes …. ( )
A) The water particles in the clothes absorb energy and makes clothes cool down.
B) The water particles in the clothes release energy and make surroundings cool down.
C) The water particles in the clothes absorb energy and make surroundings cool down.
D) The water particles in the clothes release energy and make surroundings heat up.
Answer:
C) The water particles in the clothes absorb energy and make surroundings cool down.

Question 44.
Anitha observed that the liquid in the broad plate is evaporated quickly than that of a narrow mouthed glass. Which factor is involved?
A) Surface area
B) Temperature
C) Humidity
D) Wind speed
Answer:
A) Surface area

Question 45.
You feel cold when you pour some acetone on your skin. It is because…
A) The particles of acetone gain energy from the skin.
B) The particles of acetone lose energy.
C) The particles of skin gain energy from the acetone.
D) B and C
Answer:
A) The particles of acetone gain energy from the skin.

Question 46.
How much energy is absorbed from the body while sweat making us cool ? ( )
A) Latest heat of fusion.
B) Latest heat of evaporation.
C) Latest heat of sublimation.
D) None of the above.
Answer:
B) Latest heat of evaporation.

Question 47.
Take some ice-cold water in a tumbler. You can observe water droplets on the outer surface on the tumbler due to …. ( )

A) evaporation of ice-cold water.
B) condensation of ice-cold water.
C) evaporation of surrounding air.
D) condensation of surrounding air.
Answer:
D) condensation of surrounding air.

Question 48.
Water vapour at 100°C leaves severe burns than water at 100°C because … ( )
A) water vapour at 100°C has more latent heat of evaporation than that of boiled water at 100°C
B) water vapour at 100°C has less latent heat of evaporation than that of boiled water at 100°C
C) water vapour at 100°C has more latent heat of fusion than that of boiled water at 100°C
D) water vapour at 100°C has less latent heat of fusion than that of boiled water at 100°C.
Answer:
A) water vapour at 100°C has more latent heat of evaporation than that of boiled water at 100°C

Question 49.
Which of the following has more kinetic energy ?
A) water at 100°C
B) water vapour at 100°C
C) Both A and B
D) Ice at 0°C
Answer:
B) water vapour at 100°C

Question 50.
Which of the following has involved evaporation ?
A) Water in a tumbler changing into water vapour at 100°C
B) Water in a tumbler changinginto water vapour at 50°C
C) A and B
D) Water in a tumbler changing into ice at 0°C
Answer:
B) Water in a tumbler changinginto water vapour at 50°C

Question 51.
Assertion (A) : We wear cotton clothes in summer.
Reason (R) : Cotton is good absorber of sweat.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true and R is not the correct explanation of A
C) A is true, but R is false.
D) A is false, but R is true.
Answer:
A) Both A and R are true and R is the correct explanation of A.

Question 52.
Assertion (A) : Our palm feels cold when we put some petrol on it.
Reason (R) : Petrol condensate on the palm due to more surface area.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true and R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.
Answer:
C) A is true, but R is false.

Question 53.
Assertion (A) : After a hot sunny day, people sprinkle water on the roof or open ground for cooling.
Reason (R) : The less latent heat of vaporization of water helps to cool the hot surface.
A) Both A and R are true and R is the correct explanation of A.
B) Both A and R are true and R is not the correct explanation of A
C) A is true, but R is false.
D) A is false, but R is true.
Answer:
C) A is true, but R is false.

Question 54.

Property	X	y	z
Shape	fixed	not fixed	not fixed
Volume	fixed	fixed	not fixed
Compressible	no	no	yes

From the above table, x, y and z are ……….. respectively.
A) solid, liquid, gas
B) solid, gas, liquid
C) liquid, solid, gas
D) liquid, gas, solid
Answer:
A) solid, liquid, gas

Question 55.
A is liquid; B is solid; C is gas
Which of the above has both fixed shape and volume?
A) A
B) B
C) C
D) A and B
Answer:
B) B

Question 56.
H₂O at 0°C- State (A)
H₂O at 100°C – State (B)
H₂O at 80°C – State (C)
Which state is solid state?
A) State (A)
B) State (B)
C) State (C)
D) None
Answer:
D) None

9th Class Physical Science Bit Bank