Solving the Is Matter Around Us Pure Multiple Choice Questions of Class 9 Science Chapter 2 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Is Matter Around Us Pure Class 9 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 2 Science Class 9 and cross-check your answers during preparation.

Multiple Choice Questions

Question 1.
What is the boiling point of acetone?
(a) 196°C
(b) 186°C
(c) 78.3°C
(d) 183°C

Answer

Answer: (c) 78.3°C

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Question 2.
Who was the first scientist to use the term ‘element’ in 1661?
(a) Robert Boyle
(b) Charles
(c) Antonnie Lorent
(d) None of them

Answer

Answer: (a) Robert Boyle

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Question 3.
Boron, silicon, germanium, etc., are:
(a) Metals
(b) Non-metals
(c) Metalloids
(d) None of them

Answer

Answer: (c) Metalloids

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Question 4.
The major component of a solution is called:
(a) solute
(b) insoluble
(c) solvent
(d) solution

Answer

Answer: (c) solvent

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Question 5.
Which of the following will show the “Tyndall effect”?
(a) Salt solution
(b) Milk and starch solution
(c) Copper sulphate solution
(d) None of them

Answer

Answer: (b) Milk and starch solution

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Question 6.
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

Answer

Answer: (d) 10^-10 – 10^-8 m

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Question 7.
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)

Answer

Answer: (c) (i), (iii) and (iv)

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Question 8.
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)

Answer

Answer: (a) (i) and (ii)

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Question 9.
Which of the following are homogeneous in nature?
(i) Ice
(ii) Wood
(iii) Soil
(iv) Air
(a) (i) and (ii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (iii) and (iv)

Answer

Answer: (c) (i) and (iv)

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Fill in the Blanks.

Question 10.
Pure substances can be elements or _________

Answer

Answer: compounds

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Question 11.
Metals are good __________ of heat and electricity.

Answer

Answer: conductor

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Question 12.
To separate a mixture of two or more miscible liquids for which the difference in boiling points is less than ________ fractional distillation method is used.

Answer

Answer: 25K

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Question 13.
The diameter of suspension particles is bigger than ___________

Answer

Answer: 10^-5 m

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Question 14.
_________ effect originates due to optical properties of a colloidal solution.

Answer

Answer: Tyndall

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True/False.

Question 15.
The concentration of a solution is the amount of solute present per unit volume or per unit mass of the solution/solvent.

Answer

Answer: True

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Question 16.
Colloids are homogeneous mixtures.

Answer

Answer: False

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Question 17.
The solution is a homogeneous mixture.

Answer

Answer: True

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Question 18.
The characteristic features of a particular substance obtained from different sources will be different.

Answer

Answer: False

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Question 19.
A mixture has a fixed melting point.

Answer

Answer: False

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Question 20.
The particles of a suspension can not be filtered out by using filter paper.

Answer

Answer: True

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Match the Column.

Question 21.

A	B
1. Aerosol	(i) Shaving cream
2. Foam	(ii) Coloured gemstone, milky glass
3. Emulsion	(iii) Milk of magnesia, mud
4. Sol	(iv) Milk, face cream
5. Gel	(v) Fog, clouds, mist
6. Solid sol	(vi) Jelly, cheese, butter

Answer

Answer:

A	B
1. Aerosol	(v) Fog, clouds, mist
2. Foam	(i) Shaving cream
3. Emulsion	(iv) Milk, face cream
4. Sol	(iii) Milk of magnesia, mud
5. Gel	(vi) Jelly, cheese, butter
6. Solid sol	(ii) Coloured gemstone, milky glass

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Answer in one Word/Sentence.

Question 22.
What is known as ‘tincture iodine’?

Answer

Answer: Solution of iodine and alcohol

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Question 23.
Which technique is used to separate two immiscible liquids?

Answer

Answer: By the use of separating funnel

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Question 24.
What is a substance composed of two or more elements, chemically combined with one another in a fixed proportion known as?

Answer

Answer: Compound

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Question 25.
Name a metallic element found in a liquid state at room temperature.

Answer

Answer: Mercury

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Question 26.
How would you separate common salt and iodine from their mixture?

Answer

Answer: By sublimation

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