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
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