MCQ : Is Matter Around Us Pure - 3 | 20 Questions MCQ Test

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This mock test of MCQ : Is Matter Around Us Pure - 3 for Class 9 helps you for every Class 9 entrance exam. This contains 20 Multiple Choice Questions for Class 9 MCQ : Is Matter Around Us Pure - 3 (mcq) to study with solutions a complete question bank. The solved questions answers in this MCQ : Is Matter Around Us Pure - 3 quiz give you a good mix of easy questions and tough questions. Class 9 students definitely take this MCQ : Is Matter Around Us Pure - 3 exercise for a better result in the exam. You can find other MCQ : Is Matter Around Us Pure - 3 extra questions, long questions & short questions for Class 9 on EduRev as well by searching above.

QUESTION: 1

The properties of mixture are _________ from its components.

A.
entirely different
B.
slightly different
C.
similar
D.
different

Solution:

QUESTION: 2

Which of the following is a colloidal solution?

A.
Starch solution
B.
Copper sulphate solution
C.
Chalk powder in water
D.
Kerosene oil and water

Solution:

QUESTION: 3

Which of the following is a colloid?

A.
Aluminium paint
B.
Blood
C.
Milk
D.
All

Solution:

QUESTION: 4

Which of the following is a physical change?

A.
Burning of a candle
B.
Rusting of iron
C.
Freezing of water
D.
Digestion of food

Solution:

QUESTION: 5

When iron and sulphur are heated at high temperature

A.
Black coloured FeS is formed
B.
Mixture of iron and sulphur is obtained
C.
Yellow coloured iron sulphide is formed
D.
They do not heat

Solution:

QUESTION: 6

Which of the following has the highest solubility at 293 K?

A.
KN0₃
B.
NaCl
C.
KCl
D.
NH₄Cl

Solution:

QUESTION: 7

The size of the colloidal particle is in the range of

A.
1 Å to 100 Å
B.
1 nm to 100 nm
C.
10^-9 m to 10^-6 m
D.
10^-9 cm to 10^-7 c

Solution:

QUESTION: 8

Which of the following statements is true?

A.
Homogeneous mixtures can have variable composition
B.
Homogeneous mixtures fixed composition
C.
Heterogeneous mixtures have fixed composition
D.
Salt solution is heterogeneous mixture

Solution:

QUESTION: 9

Which out of the following is a heterogeneous mixture?

A.
air
B.
brass
C.
Iodised table salt
D.
steel

Solution:

QUESTION: 10

The size of particles of true solutions is

A.
< 1 nm
B.
Between 1 nm to 100 nm
C.
> 100 nm
D.
> 1000 nm

Solution:

QUESTION: 11

The cause of Brownian movement is

A.
attractive forces between the particles of dispersed phase and dispersing medium
B.
impact of molecules of dispersion medium on colloidal particles
C.
heat changes in liquid state
D.
convection current

Solution:

Brownian movement arises because of the impact of the molecules of the dispersion medium with the colloidal particles. Since the impacts of the molecules of the dispersion medium on the colloidal particles are unequal (i.e. unbalanced bombardment), the result is zig-zag motion.

QUESTION: 12

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%

Solution:

QUESTION: 13

Which of the following is not a compound?

A.
Sulphur dioxide
B.
Chalk
C.
Lead
D.
Sulphuric acid

Solution:

QUESTION: 14

The particles of suspension

A.
can’t be seen with naked eye
B.
can’t be seen with the help of powerful microscope
C.
can be seen with naked eye
D.
can’t be seen with electron microscope

Solution:

QUESTION: 15

Which of the following statement is true about compounds?

A.
Compound is homogeneous and have fixed composition
B.
Compound is heterogeneous and have fixed composition
C.
Compound is heterogeneous
D.
Compound is heterogeneous and has no fixed composition

Solution:

QUESTION: 16

The particles of colloidal solution can be separated by

A.
evaporation
B.
filtration
C.
centrifugation
D.
distillation

Solution:

e correct answer is c

The process by which we can separate the particles of a colloidal solution is called Centrifugation.

QUESTION: 17

Which of the following statement is always true when a substance undergoes physical change

A.
It changes colour
B.
a new substance is formed
C.
It boil
D.
Its composition remains the same

Solution:

QUESTION: 18

What is the percentage of fat present in milk of full cream?

A.
6.0 %
B.
4.0 %
C.
3.0 %
D.
1.5 %

Solution:

The correct answer is a

Full-fat milk is standardised to 3.5% of fat and semi skimmed milk contains approximately 1.5% fat. Skimmed milk and buttermilk are very low in fat and, on average, contain 0.1 or 0.2% fat respectively.

QUESTION: 19

Which of the following is heterogeneous?

A.
Stainless steel
B.
Brass
C.
Air
D.
Smoke

Solution:

QUESTION: 20

Kerosene oil and water can be separated by

A.
separating funnel
B.
distillation
C.
centrifugation
D.
evaporation

Solution:

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MCQ : Is Matter Around Us Pure - 3

20 Questions MCQ Test Science Class 9 | MCQ : Is Matter Around Us Pure - 3

The properties of mixture are _________ from its components.

Which of the following is a colloidal solution?

Which of the following is a colloid?

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