CBSE Class 9 Science Matter In Our Surroundings MCQs

Question: When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment:
(a) Air is heavier than bromine
(b) Both air and bromine have the same density
(c) Bromine is heavier than air
(d) Bromine cannot be heavier than air because it is going upwards against gravity 

Answer:   C

Question: When water at 0°C freezes to form ice at the same temperature of 0°C, then it:
(a) Absorbs some heat
(b) Releases some heat
(c) Neither absorbs nor releases heat
(d) Absorbs exactly 3.34 x 105J/kg of heat

Answer:   B

Question: The evaporation of a liquid can best be carried out in a:
(a) Flask
(b) China dish
(c) T est tube
(d) Beaker

Answer:   B

Question: Zig-zag movement of the solute particle in a solution is known as
(a) Linear motion
(b) Circular motion
(c) Brownian motion
(d) Curved motion.

Answer:   C

Question: CO₂ can be easily liquified and even solidified because
(a) It has weak forces of attraction
(b) It has comparatively more force of attraction than other gases
(c) It has more intermolecular space
(d) It is present in atmosphere.

Answer:   B

Question: A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
(a) Water, air, wind
(b) Air, sugar, oil
(c) Oxygen, water, sugar
(d) Salt, juice, air

Answer:   C 

Question: Which of the following phenomena always results in the cooling effect?
(a) Condensation
(b) Evaporation
(c) Sublimation
(d) None of these

Answer:   B

Question: The colour of vapours formed on sublimation of iodine solid is
(a) Purple (violet)
(b) Colourless
(c) Yellow
(d) Orange

Answer:   A

Question: A gas which obeys the gas laws is known as:
(a) An ideal gas
(b) A heavier gas
(c) A lighter gas
(d) A real gas

Answer:   A

Question: What s the term used to describe the phase change as a liquid becomes a solid?
(a) Evaporation
(b) Condensation
(c) Freezing
(d) None of the above

Answer:   C

Question: Which of the following phenomena would increase on raising the temperature?
(a) Diffusion, evaporation, compression of gases
(b) Evaporation, compression of gases, solubility
(c) Evaporation, diffusion, expansion of gases
(d) Evaporation, solubility, diffusion, compression of gases

Answer:   C

Question: The quantity of matter present in an object is called its:
(a) Weight
(b) Gram
(c) Mass
(d) Density

Answer:   C

Question : As solid melts to form liquid:
(a) Inter particle distance increases 
(b) Inter molecular forces of attraction decreases
(c) Compressibility increases
(d) All of the above

Answer : D

Question : Which of the following is not characteristic of solid:
(a) High Rigidity 
(b) Regular Shape 
(c) High density 
(d) High compressibility

Answer : D

Question : The boiling point of water is:
(a) 101°C at atmospheric pressure
(b) 273K at atmospheric pressure
(c) 0°C at atmospheric pressure 
(d) 0K at atmospheric pressure

Answer : A

Question : Which of the following has highest intermolecular forces of attraction?
(a) Water at room temperature
(b) CO₂ gas
(c) Ethyl alcohol
(d) Iron metal

Answer : D

Question : Which of the following substances will undergo sublimation?
(a) Common salt
(b) Odonil
(c) Sugar
(d) Sand

Answer : B

Question : The process of evaporation causes:
(a) Cooling 
(b) Heating
(c) Dryness 
(d) None of the above

Answer : A

Question : The conversion of solid to gas directly is called:
(a) Evaporation 
(b) Sublimation
(c) Distillation
(d) condensation

Answer : B

Question : Evaporation of a liquid can take place:
(a) At its boiling point
(b) At all temperatures
(c) At its freezing point
(d) At a fixed temperature

Answer : B

Question : Which of the following describes a liquid state:
(a) Definite volume and definite shape
(b) Definite volume and no specific shape
(c) definite shape but no definite volume
(d) neither definite shape nor definite volume

Answer : B

Question : Wet clothes are kept for drying. Which of the following does not help them in drying:
(a) Spreading it out 
(b) Blowing wind over it 
(c) Making the room a little warmer 
(d) Cooling the room

Answer : D

Question : At higher altitudes the boiling points of liquids
(a) Increases
(b) Decreases
(c) Remains the same
(d) Increases then decreases

Answer : B

Question : During evaporation particles of a liquid change into vapours :
(a) From the surface 
(b) From the bulk 
(c) From the bottom 
(d) From all over the liquid

Answer : A

Question : In which phenomenon does water change into water vapour below its boiling point:
(a) Boiling 
(b) Evaporation 
(c) Freezing 
(d) Sublimation

Answer : B

Question : We get the smell of hot food in the kitchen outside the house because of:
(a) Boiling 
(b) Evaporation
(c) Sublimation 
(d) Diffusion

Answer : D

Question : Which are the favourable conditions for liquefaction of petroleum gas:
(a) High pressure, high temperature 
(b) Low pressure, low temperature
(c) High pressure, low temperature 
(d) Low pressure, high temperature

Answer : C

Question : Latent heat of vapourisation is used to:
(a) Overcome forces of attraction between the liquid particles at the boiling point
(b) Overcome forces of attraction between solid particles at the freezing point
(c) Increase the kinetic energy of particles in the liquid state
(d) Increase the kinetic energy of the particles in the vapour phase

Answer : A

Question : Which of the following has highest density?
(a) Kerosene
 (b) Water
 (c) Iron
 (d) Wood

Answer : C

Question : Dry ice on heating produces:
(a) Liquid CO₂ 
(b) Gas CO₂ 
(c) Liquid water
 (d) Water vapour

Answer : B

Question : Particles move randomly in:
(a) Water 
(b) Sugar 
(c) Nitrogen 
(d) Dry ice

Answer : C

Question : When we blow air into the balloon it inflates because:
(a) Air particles diffuse into the balloon 
(b) Air particles collide with the walls of the balloon and exert pressure on them
(c) Rubber is elastic in nature 
(d) The temperature of air in the balloon increases

Answer : B 

Question : When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:
(a) Decrease in solubility on decreasing temperature
(b) Decrease in solubility on increasing temperature
(c) Decrease in solubility on decreasing pressure
(d) Decrease in solubility on increasing pressure

Answer : C

Question. A mixture of oil and water can be separated by:
(a) Sublimation
(b) Crystallisation
(c) Chromatography
(d) Separating funnel

Answer : D

Questions 3 to 5 are based on the following information:
Four samples A, B, C, D are prepared by adding a pinch of copper sulphate, a spatula of copper sulphate, a spatula of chalk powder, and some milk, to water respectively.
3. Which one is the colloidal solution among them?
(a) C
(b) D
(c) B
(d) A

Answer : B

Question. Which of these will form a clear and transparent solution:
(a) A
(b) B
(c) A and B
(d) B and D

Answer : C

Question. Which of these will exhibit the Tyndall effect?
(a) A and D
(b) B and C
(c) A and B
(d) D

Answer : D

Question. Which of the following represents a chemical change?
(a) Extraction of copper from copper pyrites
(b) Distillation of water
(c) Melting of wax
(d) Dissolution of salt in water

Answer : A

Question. The sequence of steps for separating a mixture of salt, sand and camphor is:
(a) Adding water, filtration, evaporation, sublimation
(b) Adding water, filtration, sublimation, evaporation
(c) Sublimation, adding water, filtration, evaporation
(d) Sublimation, adding water, evaporation, filtration

Answer : C

Question : Which of the following is the correct set of apparatus for fractional distillation?
(a) Round bottomed flask, thermometer, water condenser and beaker
(b) Round bottomed flask, thermometer, air condenser and beaker
(c) Round bottomed flask, thermometer, fractionating column, water condenser and flask
(d) Round bottomed flask, thermometer, fractionating column, air condenser and flask

Answer : C

Question : In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?
(a) A
(b) B
(c) Both at the same speed
(d) Separation of dyes is independent of the solubility in solvent

Answer : B

Question : Different components can be separated from petroleum by:
(a) FiltrationA
(b) Chromatography
(c) Simple distillation
(d) Fractional distillation

Answer : D

Question: When we put some crystals of potassium permanganate in a beaker containing water, we observe that after sometime whole water has turned pink. This is due to:
(a) Boiling
(b) Melting of potassium permanganate crystals
(c) Sublimation of crystals
(d) Diffusion

Answer:   D

Question: Which of the following describes the liquid phase?
(a) It has a definite shape and a definite volume
(b) It has a definite shape but not a definite volume
(c) It has a definite volume but not a definite shape
(d) It has neither a definite shape nor a definite volume

Answer:   C

Question: Equal volumes of all gases under similar conditions of temperature and pressure contain equal numbers of molecules. This statement was made by:
(a) Gay- lussae
(b) Avogadro
(c) Berzilius
(d) John Dalton

Answer:   B

Question:  0 ° C temperature is equal to
(a) 0 K
(b) 273 K
(c)-273 K
(d) 300 K

Answer:   B 

Question: Out of the following which is the densest state of matter?
(a) Solids
(b) Liquids
(c) Gases
(d) Plasmas

Answer:   A

Question: Rate of diffusion of a gas is:
(a) Directly proportional to its density
(b) Directly proportional to its molecular mass
(c) Inversely proportional to the square root of its density
(d) Inversely proportional to the square root of its molecular mass

Answer:   D

Question: Kinetic energy of molecules is directly proportional to
(a) Temperature
(b) Pressure
(c) Both (a) and (b)
(d) Atmospheric pressure

Answer:   A

Question: Which condition out of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water

Answer:   A

Question: Which of the following statement is not true regarding the characteristic of matter?
(a) Particles of a matter are randomly moving in all directions.
(b) Kinetic energy of the particles increases with a rise in temperature
(c) Kinetic energy of the particles of all maters remains the same at a particular temperature.
(d) Particles of matter diffuse into each other on their own.

Answer:   C

Question: Which one is a sublime substance?
(a) Table salt
(b) Sugar
(c) Iodine
(d) Potassium iodide

Answer:   C

Question: Liquids have -
(a) fixed volume and fixed shape
(b) fixed shape and no fixed volume
(c) fixed volume and no fixed shape
(d) neither fixed volume nor fixed shape

Answer:   C

Question: When we add sugar in water, particles of sugar disappear because they -
(a) are very small
(b) get into the spaces between water particles
(c) are moving
(d) all above

Answer:   D

Question: Which of the following substances becomes liquid easily upon heating?
(a) butter
(b) glass
(c) sponge
(d) rubber band

Answer:   A

Question: Gases are liquefied under
(a) high pressure, high temperature
(b) high pressure, low temperature
(c) low pressure, high temperature
(d) low pressure, low temperature

Answer:   B

Question: Which is not the characteristic of matter –
(a) particles of a matter are continuously moving,
(b) particles of matter move faster on increasing temperature,
(c) particles of matter intermix with each other on their own,
(d) particles of all maters have same kinetic energy.

Answer:   D

Question: As solid melts to form liquid:
(a) Inter particle distance increases
(b) Inter molecular forces of attraction decreases
(c) Compressibility increases
(d) All of the above

Answer : D

Question: Which of the following is not characteristic of solid:
(a) High Rigidity
(b) Regular Shape
(c) High density
(d) High compressibility

Answer : D

Question: The boiling point of water is: 
(a) 101°C at atmospheric pressure
(b) 273K at atmospheric pressure
(c) 0°C at atmospheric pressure
(d) 0K at atmospheric pressure

Answer : A

Question: Which of the following has highest intermolecular forces of attraction? 
(a) Water at room temperature
(b) CO₂ gas
(c) Ethyl alcohol
(d) Iron metal 

Answer : D

Question: Which of the following substances will undergo sublimation?
(a) Common salt
(b) Odonil
(c) Sugar
(d) Sand 

Answer : B

Question: The process of evaporation causes: 
(a) Cooling
(b) Heating
(c) Dryness
(d) None of the above

Answer : A

Question: The conversion of solid to gas directly is called: 
(a) Evaporation
(b) Sublimation
(c) Distillation
(d) condensation 

Answer : B

Question: Evaporation of a liquid can take place: 
(a) At its boiling point
(b) At all temperatures
(c) At its freezing point
(d) At a fixed temperature

Answer : B

Question: Which of the following describes a liquid state: 
(a) Definite volume and definite shape
(b) Definite volume and no specific shape
(c) definite shape but no definite volume
(d) neither definite shape nor definite volume 

Answer : B

Question: Wet clothes are kept for drying. Which of the following does not help them in drying: 
(a) Spreading it out
(b) Blowing wind over it
(c) Making the room a little warmer
(d) Cooling the room

 Answer : D

Question: At higher altitudes the boiling points of liquids
(a) Increases
(b) Decreases
(c) Remains the same
(d) Increases then decreases 

Answer : B

Question: During evaporation particles of a liquid change into vapours :
(a) From the surface
(b) From the bulk
(c) From the bottom
(d) From all over the liquid  

Answer : B

Question: In which phenomenon does water change into water vapour below its boiling point: 
(a) Boiling
(b) Evaporation
(c) Freezing
(d) Sublimation

 Answer : B

Question: We get the smell of hot food in the kitchen outside the house because of: 
(a) Boiling
(b) Evaporation
(c) Sublimation
(d) Diffusion 

Answer : D

Question: Which are the favourable conditions for liquefaction of petroleum gas: 
(a) High pressure, high temperature
(b) Low pressure, low temperature
(c) High pressure, low temperature
(d) Low pressure, high temperature 

Answer : C

Question: Latent heat of vapourisation is used to: 
(a) Overcome forces of attraction between the liquid particles at the boiling point
(b) Overcome forces of attraction between solid particles at the freezing point
(c) Increase the kinetic energy of particles in the liquid state 
(d) Increase the kinetic energy of the particles in the vapour phase

Answer : A

Question: Which of the following has highest density?
(a) Kerosene
(b) Water
(c) Iron
(d) Wood 

Answer : C

Question: Dry ice on heating produces:
(a) Liquid CO₂ 
(b) Gas CO₂ 
(c) Liquid water
(d) Water vapour 

 Answer : B

Question: Particles move randomly in: 
(a) Water
(b) Sugar
(c) Nitrogen
(d) Dry ice 

Answer : C

Question: When we blow air into the balloon it inflates because:
(a) Air particles diffuse into the balloon
(b) Air particles collide with the walls of the balloon and exert pressure on them
(c) Rubber is elastic in nature
(d) The temperature of air in the balloon increases  

Answer : B