Here we are providing Class 9 Science Objective Chapter – 2 Is Matter Around Us Pure because its very important for Class 9 students as we all know that every board exam question has MCQs so that students should practice these questions so that students can get good marks in board. Class 9 Science Objective Chapter – 2 Is Matter Around Us Pure is an extremely important and its also a year in which students learn the fundamentals of concepts that help them lay a solid foundation for their higher education. Here we are providing in Class Class 9 Science Objective Chapter – 2 Is Matter Around Us Pure 100+ questions so that students practice more and more. If you want class wise Notes Then Click Here
Class 9 Science Objective Chapter – 2 Is Matter Around Us Pure
1. Name the mixture whose particles are large enough to scatter light.
( A ) Colloid
( B ) True solutions
( C ) Homogeneous solution
( D ) All of the above
Ans – ( A )
2.Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compound 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)
Ans – ( B )
3. Which of the following property does not describe a compound?
( A ) It is composed of two or more elements
( B ) It is a pure substance.
( C ) It cannot be separated into constituents by physical means
( D ) It is mixed in any proportion by mass
Ans – ( D )
4.Rusting of an article made up of iron is called
( A ) corrosion and it is a physical as well as chemical change
( B ) dissolution and it is a physical change
( C ) corrosion and it is a chemical change
( D ) dissolution and it is a chemical change
Ans – ( C )
5. The components of a solution are:
( A ) Dispersed particles and solvent
( B ) Solute and solvent
( C ) Dispersed phase and dispersion medium
( D ) Solute and dispersed medium
Ans – ( B )
6.A mixture of sulphur and carbon disulphide is
( A ) heterogeneous and shows Tyndall effect
( B ) homogeneous and shows Tyndall effect
( C ) heterogeneous and does not show Tyndall effect
( D ) homogeneous and does not show Tyndall effect
Ans – ( D )
8. The smell of hydrogen sulphide (H2S) gas
( A ) pleasant
( B ) of rotten egg
( C ) of burning sulphur
( D ) None of these
Ans – ( B )
9.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
Ans – ( D )
10. Which of the following substances will not dissolve in water?
( A ) Sugar
( B ) Sodium chloride
( C ) Copper sulphate
( D ) Carbon
Ans – ( D )
11.Which of the following are homogeneous in nature?
(i) ice
(ii) wood
(iii) soil
(iv) air
( A ) (i) and (iii)
( B ) (ii) and (iv)
( C ) (i) and (iv)
( D ) (iii) and (iv)
Ans – ( C )
12. What is the principle behind the process of centrifugation?
( A ) Particles are separated based on the difference in colour.
( B ) Denser particles are forced to the bottom and lighter particles stay at the top when spun rapidly.
( C ) Lighter particles are forced to the bottom and denser particles stay at the top when spun rapidly.
( D ) Particles are separated based on the difference in temperature.
Ans – ( B )
13.Blood and sea water are
( A ) both mixtures
( B ) both are compounds
( C ) blood is a mixture whereas sea water is a compound
( D ) blood is a compound and sea water is a mixture
Ans – ( A )
14. What will you observe when a mixture of iodine and salt is heated in a china dish?
( A ) No change in the china dish is observed.
( B ) Salt is left behind in the china dish.
( C ) Iodine is left behind in the china dish.
( D ) The mixture starts melting.
Ans – ( B )
15.Sol and gel are examples of
( A ) Solid-solid colloids
( B ) Sol is a solid-liquid colloid and gel is liquid solid colloid
( C ) Sol is solid-solid colloid and gel is solid-liquid colloid
( D ) Sol is a liquid-solid colloid and gel is a solid-liquid colloid
Ans – ( B )
16. An example of a liquid metal and a liquid non-metal is
( A ) gallium, mercury
( B ) mercury, chlorine
( C ) mercury, bromine
( D ) bromine, sulphur
Ans – ( C )
17.In a water-sugar solution
( A ) water is solute and sugar is solvent
( B ) water is solvent and sugar is solute
( C ) water is solute and water is also solvent
( D ) none of these
Ans – ( B )
18. Which technique is used in diagnostic laboratories for blood and urine test?
( A ) Sublimation
( B ) Centrifugation
( C ) Evaporation
( D ) Magnetic separation
Ans – ( B )
19.Boron and carbon are
( A ) metalloids
( B ) metalloid and non-metal respectively
( C ) metal
( D ) non-metal and metalloid respectively
Ans – ( B )
20. Which method is used to separate cream from milk?
( A ) Centrifugation
( B ) Adsorption
( C ) Distillation
( D ) Crystallization
Ans – ( A )
21.Which of the following are physical changes?
(i) Melting of iron metal
(ii) Rusting of iron
(iii) Bending of an iron rod
(iv) Drawing a wire of iron metal
( A ) (i), (ii) and (iii)
( B ) (i), (ii) and (iv)
( C ) (i), (iii) and (iv)
( D ) (ii), (iii) and (iv)
Ans – ( C )
22. Which of the following is a chemical change?
( A ) Melting of wax
( B ) Mixing of iron filings with sulphur powder
( C ) Cooking of food
( D ) Dissolving salt in water
Ans – ( C )
23.Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
( A ) (i) and (ii)
( B ) (ii) and (iii)
( C ) (iii) and (iv)
( D ) (i) and (iv)
Ans – ( A )
24. The continuous zig-zag movement of colloidal particles in a dispersion medium is called
( A ) Dispersion
( B ) Tyndall effect
( C ) Brownian movement
( D ) Oscillation
Ans – ( C )
25.Which of the following methods would you use to separate cream from milk?
( A ) Fractional distillation
( B ) Distillation
( C ) Centrifugation
( D ) Filtration
Ans – ( C )
26. A change of state from one form to another is a
( A ) physical change
( B ) chemical change
( C ) biological change
( D ) state variation
Ans – ( A )
27.Cooking of food and digestion of food:
( A ) are both physical processes
( B ) are both chemical processes
( C ) cooking is physical whereas digestion is chemical
( D ) cooking is chemical whereas digestion is physical
Ans – ( B )
28. The formation of water from oxygen and hydrogen is a _______ .
( A ) Physical change
( B ) Chemical change
( C ) Reversible change
( D ) Both Physical and Reversible change
Ans – ( B )
29. What is the name of the metal which exists in liquid state at room temperature?
( A ) Sodium
( B ) Potassium
( C ) Mercury
( D ) Bromine
Ans – ( C )
30. What do you understand by the term concentrated solution?
( A ) Solution containing no solute
( B ) Solution with low solute concentration
( C ) Solution in which no more solute can be dissolved
( D ) Solution with high solute concentration
Ans – ( D )
31.What is the boiling point of acetone?
( A ) 196°C
( B ) 186°C
( C ) 78.3°C
( D ) 183°C
Ans – ( C )
32. The clear liquid which is left behind in the beaker after settling down of the sediments is called:
( A ) Solvent
( B ) Supernatant liquid
( C ) Solution
( D ) Sediment
Ans – ( B )
33.Who was the first scientist to use the term ‘element’ in 1661?
( A ) Robert Boyle
( B ) Charles
( C ) Antonnie Lorent
( D ) None of them
Ans – ( A )
34. Which of the following parameters of a substance does not alter during a physical change?
( A ) State
( B ) Mass
( C ) Volume
( D ) Size
Ans – ( B )
35.Boron, silicon, germanium, etc., are:
( A ) Metals
( B ) Non-metals
( C ) Metalloids
( D ) None of them
Ans – ( C )
36. Which of the following statements is incorrect about physical changes?
( A ) There is no gain or loss of energy.
( B ) It is permanent and irreversible.
( C ) Composition of the substance remains same.
( D ) No new substance is formed.
Ans – ( B )
37.The major component of a solution is called:
( A ) solute
( B ) insoluble
( C ) solvent
( D ) solution
Ans – ( C )
38. A colloid with a solid dispersed phase and liquid dispersing medium is called:
( A ) Foam
( B ) Gel
( C ) Sol
( D ) Emulsion
Ans – ( C )
39.The size of colloidal particles are:
( A ) 10-4 – 10-8 m
( B ) 10-10 – 10-12 m
( C ) 10-2 – 10-4 m
( D ) 10-10 – 10-8 m
Ans – ( D )
40. Which technique is used to separate blood cells from plasma?
( A ) Evaporation
( B ) Sublimation
( C ) Centrifugation
( D ) Filtration
Ans – ( C )
41. A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as
( A ) a compound
( B ) an element
( C ) a molecule
( D ) a mixture
Ans – ( B )
42. A solution in which no more solute can be dissolved at a given temperature is known as:
( A ) Unsaturated solution
( B ) True solution
( C ) Dilute solution
( D ) Saturated solution
Ans – ( D )
43. Which of the following non-metal is a good conductor of electricity?
( A ) Aluminium
( B ) Silicon
( C ) Graphite
( D ) Gold
Ans – ( C )
44. Which of the following apparatus is not required in sublimation?
( A ) Condenser
( B ) Funnel
( C ) China dish
( D ) Wire gauze
Ans – ( A )
45. Which of the following property does not describe a compound?
( A ) It is composed of two or more elements
( B ) It is a pure substance.
( C ) It cannot be separated into constituents by physical means
( D ) It is mixed in any proportion by mass
Ans – ( D )
46. Which of the following method can be used to separate a mixture of camphor and sugar?
( A ) Sublimation
( B ) Filtration
( C ) Distillation
( D ) Crystallisation
Ans – ( A )
47. When two liquids do not mix, they form two separate layers and are known as
( A ) Miscible liquids
( B ) Immiscible liquids
( C ) Saturated liquids
( D ) Super saturated liquids
Ans – ( B )
48. The process of separation of insoluble solids from a liquid is called:
( A ) Filtration
( B ) Decantation
( C ) Crystallisation
( D ) Evaporation
Ans – ( A )
49. Name the technique to separate
( A ) butter from curd,
( B ) salt from sea-water,
( C ) camphor from salt.
( D ) Evaporation
Ans – ( A )
50. If a solution contains 60g of common salt in 340g of water, the mass by mass percentage will be:
( A ) 25 %
( B ) 15 %
( C ) 20 %
( D ) 17.6 %
Ans – ( B )
51.Which of the following elements is not a metalloid?
( A ) Boron
( B ) Silicon
( C ) Germanium
( D ) Tungsten
Ans – ( D )
52. During sublimation of ammonium chloride, pure ammonium chloride gets:
( A ) Liquefies to form a solution
( B ) Collected on outer sides of the funnel
( C ) Collected on inner sides of the china dish
( D ) Collected on inner sides of the funnel
Ans – ( D )
53. If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of
( A ) Evaporation
( B ) Precipitation
( C ) Condensation
( D ) Sublimation
Ans – ( D )
54. What type of change takes place when a sodium hydroxide pellet is added to water?
( A ) Reversible change
( B ) Reversible chemical change
( C ) Physical change
( D ) Chemical change
Ans – ( D )
55. Homogenous solution may separated by……………….
( A ) Chemical process
( B ) Physical process
( C ) filtration
( D ) Physical process of evaporation
Ans – ( A )
56. During filtration, the solid that remains on the filter paper is called:
( A ) Solute
( B ) Residue
( C ) Solvent
( D ) Filtrate
Ans – ( B )
57. Mixture of two or more metals , or metals and non-metals called as…………
( A ) Alloy
( B ) Solution
( C ) Mixture
( D ) Metallic mixture
Ans – ( A )
58. Which of the following has the highest solubility at 313 K?
( A ) KNO3
( B ) NaCl
( C ) KCl
( D ) NH4Cl
Ans – ( A )
59. A component present in lesser quantity in solution called………..
( A ) Solute
( B ) Sugar
( C ) Solvent
( D ) Mixture
Ans – ( A )
60.A chemical reaction involves in
( A ) Only breaking of bonds
( B ) Only formation of bonds
( C ) Both breaking and formation of bonds
( D ) None of these
Ans – ( C )
61.When no more solute can be dissolved in solution at given temperature is called………. Solution.
( A ) Homogenous
( B ) Heterogeneous
( C ) Saturated
( D ) Unsaturated
Ans – ( C )
62. Which of the following colloid is a gel?
( A ) Fog
( B ) jellies
( C ) Milk
( D ) Smoke
Ans – ( B )
63.The concentration of solution is the depend on amount of …………………. Present in given solution.
( A ) Solvent
( B ) Solution
( C ) Pericles
( D ) Solute
Ans – ( D )
64. What is the use of sedimentation tank in water purification system?
( A ) To separate out the insoluble substances from water.
( B ) To separate out very small suspended particles from water.
( C ) To kill the germs present in water.
( D ) All of the above.
Ans – ( A )
65. Which of the following statement is true for colloids?
( A ) Colloid is a homogeneous mixture.
( B ) Particles of a colloid can be seen by naked eye.
( C ) Particles of colloid scatter a beam of light passing through it.
( D ) All of these
Ans – ( C )
66. Which of the following is not a mixture?
( A ) Soap solution
( B ) Blood
( C ) Carbon dioxide
( D ) Coal
Ans – ( C )
67. What type of mixture is obtained on continuous stirring when we add one spoon of sugar to water?
( A ) Homogeneous mixture
( B ) Colloid
( C ) Suspension
( D ) Heterogeneous mixture
Ans – ( A )
68.Mercury and bromine are both
( A ) liquid at room temperature
( B ) solid at room temperature
( C ) gases at room temperature
( D ) both ( A ) and (b)
Ans – ( A )
69.In a water-sugar solution
( A ) water is solute and sugar is solvent
( B ) water is solvent and sugar is solute
( C ) water is solute and water is also solvent
( D ) none of these
Ans – ( B )
