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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

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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.

Solution:

A mixture is a material made up of two or more different substances which are physically combined. Despite the fact that there are no chemical changes to it's constituents, the physical properties of a mixture, such as it's melting point, may differ from those of the components.

QUESTION: 2

### Which of the following is a colloidal solution?

Solution:

A mixture of water and starch is colloidal because it forms a shell of firmly bound molecules of water that stops the starch particle from aggregating with the molecules of water when they collide.

QUESTION: 3

### Which of the following is a colloid?

Solution:
QUESTION: 4

Which of the following is a physical change?

Solution:
QUESTION: 5

When iron and sulphur are heated at high temperature

Solution:
QUESTION: 6

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

Solution:
QUESTION: 7

The size of the colloidal particle is in the range of

Solution:

in nanometer , the size of the colloidal particle is in the range of 1 nm to 1000 nm  , in the m ,  the size lies between:-  10-6 m to 10-9 m.

QUESTION: 8

Which of the following statements is true?

Solution:
QUESTION: 9

Which out of the following is a heterogeneous mixture?

Solution:
QUESTION: 10

The size of particles of true solutions is

Solution:
QUESTION: 11

The cause of Brownian movement is

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

Solution:

Mass of common salt (solute) = 40g
Mass of water (soluted) = 320g
Mass of solution = 320 + 40 = 360g
Concentration of solution = M(mass of solute) / mass of solution = 40/360 x 100 = 11.11%

QUESTION: 13

Which of the following is not a compound?

Solution:

Lead (Pb) is not a compound. It is an element present in its pure form so it is a single homogeneous identity. Compounds have two or more elements present in the uniform composition in the compound state.

QUESTION: 14

The particles of suspension

Solution:
QUESTION: 15

Which of the following statement is true about compounds?

Solution:
QUESTION: 16

The particles of colloidal solution can be separated by

Solution:

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

Solution:
QUESTION: 18

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

Solution:

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?

Solution:
QUESTION: 20

Kerosene oil and water can be separated by

Solution: