Class 9 Science Chapter 2 MCQ Is Matter Around Us Pure
MCQ on Is Matter Around Us Pure Class 9
Select and write the most appripriate option out of the four options for each of the question :
Question 1.
Which of the following is a mixture ?
A) Distilled water
B) Sulphuric acid
C) lodized salt
D) Gold
Answer:
C) lodized salt
Question 2.
Which of the following sentence is not correct ?
A) Homogeneous mixture cannot have a variable composition.
B) Heterogeneous mixtures contain physically distinct parts.
C) Mixture of oil and water is an example of heterogeneous mixture.
D) Mixture of sugar and water is an example of homogeneous mixture.
Answer:
A) Homogeneous mixture cannot have a variable composition.
Question 3.
Which of the following can give residue on filtering ?
A) Solution
B) Colloidal solution
C) Suspension
D) B and C
Answer:
C) Suspension
Question 4.
Solution can be in the form of ….
A) solid dissolved in solid
B) liquid dissolved in liquid
C) gas dissolved in gas
D) above all
Answer:
D) above all
Question 5.
Brass is an alloy of ….
A) Zinc and copper
B) Zinc and iron
C) Copper and silver
D) Zinc and silver
Answer:
A) Zinc and copper
Question 6.
In solute in tincture of iodine is ….
A) Water
B) Benzene
C) Kerosene
D) Alcohol
Answer:
D) Alcohol
Question 7.
Soda water contains………….
A) oxygen gas
B) nitrogen gas
C) carbon dioxide gas
D) water vapour
Answer:
C) carbon dioxide gas
Question 8.
Percentage of oxygen and nitrogen in the air ….
A) 21 %, 78 %
B) 78 %, 21%
C) 31 %, 68%
D) 68 %, 31%
Answer:
A) 21 %, 78 %
Question 9.
The size of particles in a true solution is …
a) >1 nm
B) <1 nm
C) 1 nm to 100 nm
D) >100 nm
Answer:
B) <1 nm
Question 10.
Particles are do not settle down in …
A) Solution
B) Colloidal solution
C) Suspension
D) A and B
Answer:
D) A and B
Question 11.
Light scatters in ……….
A) Solution
B) Colloidal solution
C) Suspension
D) B and C
Answer:
D) B and C
Question 12.
Particles cannot see with naked eye in …
A) Solution
B) Colloidal solution
C) Suspension
D) A and B
Answer:
D) A and B
Question 13.
If the amount of solute contained in a solution is less than the saturation level, it is called ….
A) unsaturated solution
B) saturated solution
C) super saturated solution
D) colloidal solution
Answer:
A) unsaturated solution
Question 14.
The concentration of a solution is the amount (mass or volume) of …….. given amount (mass or volume) of……….
A) Solute, solution
B) Solvent, solution
C) Solution, solute
D) Solute, solvent
Answer:
A) Solute, solution
Question 15.
Suspension is ………..
A) a heterogeneous mixture.
B) a homogeneous mixture.
C) either A or B
D) neither A nor B
Answer:
A) a heterogeneous mixture.
Question 16.
The mixtures a and b in the given picture are ………..
A) Colloid, solution
B) Solution, colloid
C) Colloid, suspension
D) Suspension, colloid
Answer:
B) Solution, colloid
Question 17.
Which of the following can show Tyndall effect ?
A) Solution
B) Colloidal solution
C) Suspension
D) A and B
Answer:
B) Colloidal solution
Question 18.
Tyndall effect is caused by ………….
A) Dispersion of light
B) Reflection of light
C) Scattering of light
D) Refraction of light
Answer:
C) Scattering of light
Question 19.
Emulsion is formed when …………. and …………. are mixed.
A) Solid, liquid
B) Liquid,’gas
C) Liquid, liquid
D) Solid, gas
Answer:
C) Liquid, liquid
Question 20.
Gel is formed when …………. and …………. are mixed.
A) Solid, liquid
B) Liquid, gas
C) Liquid, liquid
D) Solid, gas
Answer:
A) Solid, liquid
Question 21.
Clouds are examples of …
A) Gel
B) Foam
C) Emulsion
D) Aerosol
Answer:
D) Aerosol
Question 22.
We can separate the volatile component (solvent) from its non-volatile solute by the method of ………….
A) evaporation
B) sublimation
C) chromatography
D) distillation
Answer:
A) evaporation
Question 23.
Which of the following substance does not a sublime ?
A) Ammonium chloride
B) Naphthalene
C) Anthracene
D) Copper sulphate
Answer:
D) Copper sulphate
Question 24.
Which of the following steps should be followed to obtain liquid gas ? ( )
A) air is compressed by increasing the pressure and is then cooled by decreasing the temperature.
B) air is compressed by decreasing the pressure and is then cooled by increasing the temperature.
C) air is compressed by decreasing the pressure and is then cooled by decreasing the temperature.
D) air is compressed by increasing the pressure and is then cooled by increasing the temperature.
Answer:
A) air is compressed by increasing the pressure and is then cooled by decreasing the temperature.
Question 25.
The chemical nature of the following substances is same ………..
A) Water and ice
B) Oil and water
C) Kerosene and petrol
D) Camphor and ammonium chloride
Answer:
A) Water and ice
Question 26.
Which of the following is takes place during burning of a candle ?
A) Physical change
B) Chemical change
C) Both physical and chemical change
D) Either physical or chemical change
Answer:
C) Both physical and chemical change
Question 27.
Who was the first scientist to use the term element?
A) Robert Boyle
B) Antoine Laurent Lavoisier
C) Tyndall
D) Henry
Answer:
A) Robert Boyle
Question 28.
Who was the first to establish an experimentally useful definition of an element ?
A) Robert Boyle
B) Antoine Laurent Lavoisier
C) Tyndall
D) Henry
Answer:
B) Antoine Laurent Lavoisier
Question 29.
Example of metalloid is ………..
A) Mercury
B) Bromine
C) Boron
D) Sodium
Answer:
C) Boron
Question 30.
Which is the only metal that is liquid at room temperature?
A) Mercury
B) Gallium
C) Boron
D) Sodium
Answer:
A) Mercury
Question 31.
Elements, …… and ……….. become liquid at a temperature slightly above room temperature (303K)
A) gallium and cesium
B) mercury and bromine
C) boron and silicon
D) boron and carbon
Answer:
A) gallium and cesium
Question 32.
Which of the following
A) hydrogen sulphide
B) Hydrogen chloride
C) Hydrogen
D) Chlorofluorocarbons
Answer:
A) hydrogen sulphide
Question 33.
Hydrogen sulphide is prepared by …………
A) Adding water to hot iron and sulphur mixture.
B) Adding sulphuric acid to copper sulphate and iron mixture.
C) Adding water to copper and iron mixture.
D) Adding sulphuric acid to hot iron and sulphur mixture.
Answer:
D) Adding sulphuric acid to hot iron and sulphur mixture.
Question 34.
Which of the following is not an element?
A) Iron.
B) Sugar
C) Mercury
D) Copper
Answer:
B) Sugar
Question 35.
Assertion (A) : Suspensions can scatter a light beam.
Reason ( R ) : There is no floating particles in the mixture of suspension.
A) Both A and R are correct and R supports A.
B) Both A and R are correct and R does not support A.
C) A is correct but R is wrong.
D) R is correct but A is wrong.
Answer:
C) A is correct but R is wrong.
Question 36.
Assertion (A) : Cooking of rice is a chemical change.
Reason (R): We cannot change the cooked rice into raw rice.
A) Both A and R are correct and R supports A.
B) Both A and R are correct and R does not support A.
C) A is correct but R is wrong.
D) R is correct but A is wrong.
Answer:
A) Both A and R are correct and R supports A.
Question 37.
Assertion (A) : Solutions cannot leave residue on filtration.
Reason (R) : The particle size of solutions is 1nm
A) Both A and R are correct and R supports A.
B) Both A and R are correct and R does not support A.
C) A is correct but R is wrong.
D) R is correct but A is wrong.
Answer:
A) Both A and R are correct and R supports A.
Question 38.
Assertion (A) : Milk is a homogeneous mixture.
Reason (R) : No residue found after filtering the milk.
A) Both A and R are correct and R supports A.
B) Both A and R are correct and R does not support A.
C) A is correct but R is wrong.
D) R is correct but A is wrong.
Answer:
C) A is correct but R is wrong.
Question 39.
Colloidal solutions are heterogeneous in nature and always consist of altleast two phases, the disperse phase and the dispersion medium. Which of the following is not a colloidal solution?
A) Shoe polish
B) Mud water
C) Gel
D) Ice cream
Answer:
B) Mud water
Question 40.
Acetone-Water : Distillation : : Ammonium chloride-Salt :
A) Sedimentation
B) Filtration
C) Sublimation
D) Fractional distillation
Answer:
C) Sublimation
Question 41.
The correct order of sentences related to preparation of super saturated solution is
P. Add one more spoon of sugar to it
Q. Add one spoon of sugar to 100 ml of water in a breaker
R. On heating the undissolved sugar dissolves to form a super saturated solution
S. It dissolves totally to form saturated solution
A) Q, S, P, R
B) Q, R, P,S
C) P, Q, R, S
D) Q, P, R, S
Answer:
A) Q, S, P, R
Question 42.
Ink is a mixture of a dye in water. We can separate the components in the ink using evaporation. The correct observation in the experiment is
i) Water is separated in the form of vapour.
ii) Dye component doesn’t evaporate.
iii) Water and dye components gets evaporated.
iv) Dye components gets sablimated.
A) (i) and (ii)
B) (iii) only
C) (i) and (iv)
D) (i) only
Answer:
A) (i) and (ii)
Question 43.
Dispersion medium | Dispersed phase | Colloide type |
gas | liquid | aerosol |
liquid | x | sol |
solid | liquid | gel |
In the above table ‘x’ can be replaced by
A) Liquid
B) Solid
C) Solid or liquid
D) Gas
Answer:
C) Solid or liquid
Question 44.
Element is a basic form of matter that cannot be broken down into simple forms by chemical reactions. If any substance can be separated into two or more constituent parts by a chemical reaction it should be
A) Mixture
B) Heterogeneous mixture
C) Homogeneous mixture
D) Compound
Answer:
D) Compound
Question 45.
The amount in gr mass of solute present in 100 gr mass of solution is called concentration. If 50 gr of salt in 200 gr of water, the concentration, of that solution would be
A) 25%
B) 10%
C) 50%
D) 20%
Answer:
D) 20%
Question 46.
In hot summer Revathi gave lemonade to the guests who visited her home. The solute in that solution is/are
i) Water
ii) Lemon juice
iii) Sugar
iv) Salt
A) (i) and (ii)
B) (iii) and (iv)
C) (ii), (iii) and (iv)
D) (i) only
Answer:
C) (ii), (iii) and (iv)
Question 47.
The components of a homogenous mixture are too intimately mixed up that it will be difficult to distinguish them from each other by visual observation. Example for such mixture is
A) Kerosene-water
B) Air
C) Naphthalein-water
D) Oil-water
Answer:
B) Air
Question 48.
Which of the following is NOT a property of a mixture?
A) They can formed from elements or compounds.
B) They have the properties of the constituent substances.
C) Their composition is always fixed.
D) They can be separated by physical methods.
Answer:
C) Their composition is always fixed.
Question 49.
Which of the following is NOT a pure substance ?
A) Gold
B) Glucose
C) Milk
D) Water
Answer:
C) Milk
Question 50.
Take two test tubes, one filled with water and one with kerosene. Now add a spoon of sait in both and stir. You will observe that in the first test tube the salt dissolves completely and in the second test tube it does not dissolve. Which of the following is being tested using the above experiment?
A) To identify which substance is pure substance and which is a mixture.
B) To identify which mixture is homogeneous and which is heterogeneous.
C) To identify if water and kerosene are a solute or a solvent.
D) To identify which is a saturated solution and which is an unsaturated solution.
Answer:
B) To identify which mixture is homogeneous and which is heterogeneous.
Question 51.
If the amount of the solute present is little for a given volume of solution, the solution is said to be dilute. If the amount of the solute present is more for a given volume of solution, the solution is said to be concentrated. Concentration is the mass of solute dissolved in the given volume of the solution.
Solution X contains 50 g of salt in 100 g of water and solution Y contains 100 g of salt in 200 g of water.
Which of the following can be true based on the above information ?
A) Solution X has the same concentration as solution Y.
B) Solution X is more concentrated than solution Y.
C) Solution X is more dilute than solution Y .
D) Concentration of X cannot be compared with that of solution Y as their volumes are different.
Answer:
A) Solution X has the same concentration as solution Y.
Question 52.
i) Hydrogen – p) Suspension
ii) Water – q) Solution
iii) Lemonade – r) Element
iv) Cough Syrup – s) Compound
Choose the correct matching.
A) i – r, ii – s, iii – q, iv – p
B) i – s, ii – q, iii – p, iv – r
C) i=q, ii – p , iii – r , iv – s
D) i=p, ii – r, iii – s, iv – q
Answer:
A) i – r, ii – s, iii – q, iv – p
Question 53.
Which of the following cannot be separated by sublimation when it is mixed with Sand
A) Salt
B) Ammonium Chloride
C) Camphor
D) lodine
Answer:
A) Salt
Question 54.
A solution contains 50 g of common salt in 150 g of water. Mass percentage of solution is
A) 33.3%
B) 300%
C) 25%
D) 20%
Answer:
C) 25%
Question 55.
Which of the following shows Tyndall effect ?
A) Shoe – polish
B) Salt water
C) Copper sulphate solution
D) Coffee
Answer:
A) Shoe – polish
Question 56.
P : Tyndall effect is related to suspensions
Q : Tyndall effect is related to colloidal solutions
A) P, Q are true
B) P, Q are false
C) P True, Q False
D) P false, Q True
Answer:
D) P false, Q True