Class 9 Practice Level 2 – Set 1 – Is Matter Around Us Pure?

Total questions: 25

Which of the following statements about compounds is correct?

Topic: Elements and Compounds

They have variable compositions.

They can be separated into their elements by physical means.

They have properties different from their constituent elements.

They are always homogeneous mixtures.

None

Which method can be used to separate a mixture of sand and iron filings?

Topic: Mixtures

Filtration

Decantation

Magnetic separation

Evaporation

None

When sugar is dissolved in water, which process can be used to recover sugar?

Topic: Solutions

Filtration

Sublimation

Evaporation

Chromatography

None

Which of the following correctly distinguishes between a homogeneous and a heterogeneous mixture?

Topic: Homogeneous and Heterogeneous Mixtures

Homogeneous mixtures have uniform composition; heterogeneous mixtures do not.

Heterogeneous mixtures have uniform composition; homogeneous mixtures do not.

Both mixtures have uniform composition.

Both mixtures do not have uniform composition.

None

Which property is unique to colloids?

Topic: Colloids

Particles settle on standing.

Particles scatter light.

Particles are visible to the naked eye.

Particles can be separated by filtration.

None

Which of the following is a characteristic of a suspension?

Topic: Suspensions

Particles do not settle on standing.

Particles can be separated by filtration.

Particles are invisible to the naked eye.

Particles are uniformly distributed.

None

In a saline solution, the salt acts as the:

Topic: Solutions

Solvent

Solute

Colloid

Suspension

None

What is the primary factor affecting the separation of components in chromatography?

Topic: Separation Techniques

Boiling point

Density

Rate of adsorption

Size of particles

None

Why are alloys often more useful than pure metals?

Topic: Alloys

They are always cheaper to produce.

They have enhanced properties like strength and resistance to corrosion.

They are easier to separate into pure metals.

They are more abundant in nature.

None

10.

Which of the following is true for a solution?

Topic: Solutions

It can be separated by simple filtration.

It has a non-uniform composition.

It is a homogeneous mixture.

It can only be made of liquids.

None

11.

Which method would you use to separate a mixture of alcohol and water?

Topic: Separation Techniques

Filtration

Decantation

Distillation

Chromatography

None

12.

Which of the following is a characteristic of a pure substance?

Topic: Pure Substances

It can have variable composition.

It can be a mixture of different phases.

It has a uniform and definite composition.

It can be separated into simpler substances by physical means.

None

13.

Which separation technique would you use to separate cream from milk?

Topic: Colloids

Filtration

Centrifugation

Chromatography

Evaporation

None

14.

Which of the following is an example of a heterogeneous mixture?

Topic: Heterogeneous Mixtures

Sugar solution

Brass

Oil and water

Vinegar

None

15.

Which method can be used to separate a homogeneous mixture of two liquids?

Topic: Homogeneous Mixtures

Filtration

Simple distillation

Magnetic separation

Decantation

None

16.

What is the principle behind the separation of a mixture by centrifugation?

Topic: Separation Techniques

Difference in boiling points

Difference in densities

Difference in solubility

Difference in colour

None

17.

Which of the following statements about a solution is true?

Topic: Solutions

It can be separated by mechanical means.

It has a variable composition.

Its components are chemically combined

It is a homogeneous mixture.

None

18.

What is the Tyndall effect?

Topic: Colloids

The separation of a mixture by filtration

The scattering of light by colloidal particles

The condensation of a gas

The evaporation of a liquid

None

19.

Which of the following is a property of mixtures?

Topic: Mixtures

They have a fixed composition.

Their components can be separated by physical means.

They are always homogeneous.

They have uniform properties throughout.

None

20.

Which of the following is not an alloy?

Topic: Alloys

Steel

Bronze

Brass

Silver

None

21.

Which separation technique is used to separate a mixture of iodine and salt?

Topic: Separation Techniques

Sublimation

Filtration

Decantation

Distillation

None

22.

Which of the following is not a characteristic of a pure substance?

Topic: Pure Substances

It has a definite boiling point.

It can be separated into components by physical means.

It has a uniform composition.

It has consistent properties throughout.

None

23.

Which of the following is used to separate dyes in an ink sample?

Topic: Separation Techniques

Filtration

Chromatography

Distillation

Evaporation

None

24.

Which property of a solution does not change with the amount of solute added?

Topic: Solutions

Boiling point

Density

Solubility

Colour

None

25.

Air is an example of which type of mixture?

Topic: Homogeneous Mixtures

Heterogeneous mixture

Compound

Homogeneous mixture

Element

None

1 out of 25

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Class 9 Practice Level 2 – Set 1 – Is Matter Around Us Pure?

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