Matter Around us Pure Class 9 MCQ. We covered all the Matter Around us Pure Class 9 MCQ in this post for free so that you can practice well for the exam.
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MCQ on Matter Around us for Class 9 Students
Anaerobic bacteria digest animal waste and produce biogas (change A). The biogas is burnt as fuel (change B). Choose the correct statement.
(a) Change A is a chemical change.
(b) Change B is a chemical change.
(c) Both changes A and B are chemical changes.
(d) None of these changes is a chemical change.
Option c – Both changes A and B are chemical changes
The gas you use in the kitchen is called liquified petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out of the cylinder, it becomes a gas (process A), and then it burns (process B). Choose the correct statement.
(a) Process A is a chemical change.
(b) Process B is a chemical change.
(c) Both processes A and B are chemical changes.
(d) None of these processes is a chemical change.
Option b – Process B is a chemical change
Which one among the following statements regarding the properties of mixtures and compounds is not correct?
(a) A mixture shows the properties of its constituents but the properties of a compound are entirely different from its constituents
(b) A mixture may be homogeneous or heterogeneous but a compound is a homogeneous substance
(c) The constituents of a mixture can be separated by physical methods but those of a compound cannot be separated by physical methods
(d) Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound
Option d – Energy is either absorbed or evolved during the preparation of a mixture but not in the preparation of a compound
Which of the following statements is true for pure substances? (i) Pure substances contain only one kind of particle (ii) Pure substances may be compounds or mixtures (iii) Pure substances have the same composition throughout (iv) Pure substances can be exemplified by all elements other than nickel
(a) (i) and (ii)
(b) (i) and (iii)
(c) (iii) and (iv)
(d) (ii) and (iii)
Option b – (i) and (iii)
There are four test tubes A, B, C and D half filled with water. A considerable quantity of sugar, milk, egg white and common salt was added to them respectively by stirring the contents of each tube. A true solution will be obtained in
(a) Only A
(b) Only D
(c) Both B and C
(d) Both A and D
Option d – Both A and D
Which flow chart correctly describes a homogeneous material?
(a) Unknown – density – 3 layers
(b) Unknow – filtration – two substances
(c) Unknown – magnet – two substances
(d) Unknown – boiling – one temperature
Option d – Unknown – boiling – one temperature
40 g of common salt is dissolved in 320 g of water. The mass percentage of salt is
(a) 11.1%
(b) 12.5%.
(c) 15%
(d) 10%
Option a – 11.1%
Employing Chromatography, one cannot separate
(a) radio-isotopes
(b) colours from dye
(c) pigments from a natural colour
(d) drugs from the blood
Option a – radio-isotopes
H₂O is liquid and H₂S is gas because
(a) oxygen forms a stronger hydrogen level than sulphur.
(b) oxygen is less electronegative than sulphur.
(c) the atomic radius of oxygen is less than that of sulphur.
(d) the atomic radius of oxygen is greater than that of sulphur.
Option a – oxygen forms a stronger hydrogen level than sulphur
Two systems are said to be in thermal equilibrium if and only if :
(a) there can be a heat flow between them even if they are at different temperatures
(b) there cannot be a heat flow between them even if they are at different temperatures
(c) there is no heat flow between them
(d) their temperatures are slightly different
Option c – there is no heat flow between them
In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container (ii) Some hydrogen gas leaking out of the container (iii) Increasing the volume of the container of hydrogen gas container without (iv) Adding more hydrogen gas to the increasing the volume of the container
(a) (i) and (iii)
(b) (i) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Option c – (ii) and (iii)
Which is an incorrect statement?
(a) The matter is continuous in nature.
(b) of the three states of matter, the one that is most compact is the solid state.
(c) In solid-state interparticle space (i.e., empty space) is minimum.
(d) The density of a solid is generally more than that of a liquid.
Option a – The matter is continuous in nature
Select the one that when used would be considered the best condition for liquification of a gas.
(a) Increasing the temperature.
(b) Decreasing the pressure.
(c) Increasing the pressure and decreasing the temperature.
(d) Decreasing the pressure and increasing the temperature.
Option c – Increasing the pressure and decreasing the temperature
When a gas is compressed while keeping the temperature constant, it results in
(a) an increase in the speed of gaseous molecules
(b) an increase in a collision among gaseous molecules
(c) a decrease in the speed of gaseous molecules
(d) a decrease in collision among gaseous molecules
Option b – an increase in a collision among gaseous molecules
The melting point temperature of the solid state of a substance is 40°C. The freezing point temperature of the liquid state of the same substance will be
(a) 35°C
(b) 40°C
(c) 45°C
(d) can’t predict
Option a – 35°C
The cause of the Brownian movement is
(a) convection current
(b) heat changes in a liquid state
(c) impact of molecules of dispersion medium on colloidal particles.
(d) attractive forces between particles of the dispersed phase and the dispersion medium.
Option c – impact of molecules of dispersion medium on colloidal particles
Which one among the following processes is not part of chemical weathering?
(a) Hydration
(b) Exfoliation
(c) Oxidation
(d) Solution
Option a – Hydration
A piece of ice, 100 g in mass is kept at 0°C. The amount of heat required to melt at 0°C is (take latent heat of melting of ice to be 333.6 J/g) :
(a) 750.6 J
(b) 83.4 J
(c) 33360 J
(d) 3.336 J
Option c – 33360 J
What is the term used to denote the critical temperature at which the air becomes saturated with vapour and below which the condensation is likely to begin?
(a) Condensation point
(b) Evaporation point
(c) Dew point
(d) Point of critical temperature
Option c – Dew point
Barium in a suitable form is administered to patients before an X-ray examination of the stomach, because
(a) barium allows X-rays to pass through the stomach on account of its transparency to X-rays.
(b) barium is a good absorber of g-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture.
(c) barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture.
(d) barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the pictures.
Option c – barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
Which one of the following is involved in the desalination of seawater?
(a) Reverse osmosis
(b) Simple osmosis
(c) Use of sodium aluminium silicate as zeolite
(d) Use of ion-selective electrodes
Option a – Reverse osmosis
Which one of the following is correct? Butter is
(a) a supercooled oil
(b) an emulsion
(d) None of these
Option d – None of these
Which one of the following is not a mixture?
(a) Toothpaste
(b) Toilet soap
(c) Baking soda
(d) Vinegar
Option c – Baking soda
Which one among the following would expand the most on being heated?
(a) water
(b) Alcohol
(c) Glass
(d) Air
Option d – Air
Iron sheet kept in moist air covered with rust. Rust is ( Matter Around us Pure Class 9 MCQ )
(a) an element
(b) a compound
(c) a mixture of iron and dust
(d) a mixture of iron, oxygen and water
Option b – a compound
A student carefully observed the colloidal of starch in water, human blood, and cow milk. On the basis of observations, he made certain conclusions given below. Choose the wrong conclusion about the colloidal solution
(a) Translucent
(b) Components can be separated by ordinary filtration.
(c) Heterogenous and stable
(d) Show Tyndal effect
Option b – Components can be separated by ordinary filtration
There are four test tubes A, B, C, and D half filled with water. A considerable quantity of sugar, milk, egg white, and common salt was added to them respectively by stirring the contents of each tube. A true solution will be obtained in
(a) Only A
(b) Only D
(c) Both B and C
(d) Both A and D
Option d – Both A and D
Choose the incorrect statement about the true solution
(a) Its components can not be separated by filtration.
(b) It is opaque and unstable.
(c) Its particles can not be seen through the naked eye.
(d) It does not show the Tyndall effect.
Option b – It is opaque and unstable
Barium sulphate (BaSO4) dispersed in water used in diagnostic X-rays is a
(a) Colloid
(b) Solution
(c) Suspension
(d) Foam
Option c – Suspension
An example of a solution of liquid in gas is
(a) Dry air
(b) Sugar in water
(c) Mercury in gold.
(d) Moist air.
Option d – Moist air
The component of a solution that is present in larger amounts is referred to as
(a) Solute
(b) Solvent
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option b – Solvent
You have prepared four different mixtures in water using 1. Charcoal powder, 2. Chalk powder, 3. Slaked lime and 4. Detergent powder. If you filter these mixtures through a filter paper, there will be no residue left after filtration in the case of
(a) charcoal powder
(b) chalk powder
(c) slaked lime
(d) detergent powder
Option d – detergent powder
A mixture of sulphur and carbon disulphide is
(a) heterogeneous and shows the Tyndall effect
(b) homogeneous and shows the Tyndall effect
(c) heterogeneous and does not show the Tyndall effect
(d) homogeneous and does not show the Tyndall effect
Option d – homogeneous and does not show the Tyndall effect
Tincture of iodine has antiseptic properties. This solution is made by dissolving
(a) iodine in potassium iodide
(b) iodine in vaseline
(c) iodine in water
(d) iodine in alcohol
Option d – iodine in alcohol
The gas you use in the kitchen is called liquified petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out of the cylinder, it becomes a gas (process A), then it burns (process B). Choose the correct statement.
(a) Process A is a chemical change.
(b) Process B is a chemical change.
(c) Both processes A and B are chemical changes.
(d) None of these processes is a chemical change.
Option b – Process B is a chemical change
Anaerobic bacteria digest animal waste and produce biogas (change A). The biogas is burnt as fuel (change B). Choose the correct statement.
(a) Change A is a chemical change.
(b) Change B is a chemical change.
(c) Both changes A and B are chemical changes.
(d) None of these changes is a chemical change.
Option c – Both changes A and B are chemical changes
Which of the following is a chemical change?
(a) Dent produced on car body by a cricket ball
(b) Stretching of rubber band
(c) Brinjals and apples become dark on exposure to the atmosphere
(d) Formation of salts by collecting sea water in shallow pits
Option c – Brinjals and apples become dark on exposure to the atmosphere
Which flow chart correctly describes a homogeneous material?
(a) Unknown-density-3 layers.
(b) Unknow – filtration – two substances
(c) Unknown – magnet – two substances
(d) Unknown-boiling – one temperature
Option d – Unknown-boiling – one temperature
Magnetism is most beneficial for separating
(a) gases and non-metallic liquids
(b) magnetic solids and solids such as sulfur
(c) non-metallic solids and solids such as sulfur
(d) non-magnetic solids from non-magnetic liquids
Option b – magnetic solids and solids such as sulfur
Distillation is a good separation technique for
(a) solids
(b) liquids
(c) solid alloys
(d) gases
Option b – liquids
Solubility is a good separation technique for
(a) pure metals
(b) noble gases
(c) different salts
(d) metallic alloys
Option c – different salts
40 g of common salt is dissolved in 320 g of water. The mass percentage of salt is
(a) 11.1%
(b) 12.5%.
(c) 15%
(d) 10%
Option a – 11.1%
Water boiling in open fry pan represents which type of change?
(a) Physical and irreversible
(b) Chemical and irreversible
(c) Physical and reversible
(d) Chemical and reversible
Option a – Physical and irreversible
Which has the least energetic molecules?
(a) Solids
(b) Liquids
(c) Gases
(d) Plasmas
Option a – Solids
The process used to separate oil and water is
(a) distillation
(b) sublimation
(c) separating funnel
(d) chromatography
Option c – separating funnel
A mixture of common salt, sulphur, sand, and iron filings is shaken with carbon disulphide and filtered through filter paper. The filtrate is evaporated to dryness in a china dish. What will be left in the dish after evaporation?
(a) Sand
(b) Sulphur
(c) Iron filings
(d) Common salt
Option b – Sulphur
A mixture of ZnCl₂ and PbCl₂ can be separated by
(a) distillation
(b) crystallization
(c) sublimation
(d) adding acetic acid
Option b – crystallization
White gold is used in jewelry and contains two elements, gold, and palladium. A jeweler has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?
(a) They are homogeneous mixtures and be classified as metallic alloys.
(b) The materials are heterogeneous mixtures and can be classified by their components
(c) The samples have variable compositions and are classified as metallic solutions.
(d) The samples are heterogeneous mixtures that can be separated using magnetic properties.
Option a – They are homogeneous mixtures and be classified as metallic alloys
Non-reacting gases have a tendency to mix with each other. This phenomenon is known as
(a) chemical reaction
(b) diffusion
(c) effusion
(d) explosion
Option c – effusion
A gas can be compressed to a fraction of its volume. The same volume of gas can be spread all over a room. The reason for this is that
(a) the volume occupied by molecules of a gas is negligible as compared to the total volume of the gas.
(b) gases consist of molecules that are in a state of random motion
(c) gases consist of molecules having very large intermolecular space which can be reduced or increased under ordinary conditions
(d) None of these
Option c – gases consist of molecules having very large intermolecular space which can be reduced or increased under ordinary conditions
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