CBSE Class 9th Science 2 – Is Matter Around Us Pure MCQs

Suspension is a ____ solution

Correct! Wrong!

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In a suspension, the particles can be seen through the naked eye. Hence, it is heterogeneous.

Which of the following cannot be separated by sublimation?

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Common salt does not sublime hence, it cannot be separated by sublimation.

What should be the size of the pores in the filter for good filtration?

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If the pores of the filter are bigger than the size of the particles to be removed, then the particles to be removed will pass through the filter.

Metals are good conductors of electricity.

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Metals are good conductors of electricity, due to presence of free electrons.

Which of the following is a mixture?

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Air is a mixture of gases like nitrogen, oxygen, carbon dioxide,inert gases and water vapour. Diamond is a form of carbon. Brass is an alloy of copper and zinc. Sand is a compound (silicon dioxide).

Digestion of food is a chemical change.

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During digestion process, complex substances are broken into simple substances by the action of enzymes.

The component of a solution which is present in large amount is referred to as ____.

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Solvent is always present in a greater amount in a solution.

Which component of air is liquefied at -183°C?

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Oxygen liquefies at -183°C.

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

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A pure substance has fixed melting and boiling points.

Heat is absorbed or evolved in the formation of ____.

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Heat is either released or absorbed in the formation of a compound from its constituent elements.

A homogeneous mixture of two or more substances is a ____.

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A homogeneous mixture of two or more substances is a solution. In a solution, solute cannot be seen even with a microscope as it is completely dissolved in the solvent and the solution is uniform.

Which of the following can be separated by filtration?

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Soil in water is a suspension. Hence, soil can be removed by filtration.

Sulphur is soluble in ____.

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Carbon disulphide is an inorganic solvent and sulphur is soluble in it.

Which of the following methods can separate cream from milk?

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Centrifugation is a method in which the mixture containing suspended particles is rotated at high speeds in a centrifuge. The denser particles settle down at the bottom and the lighter particles stay at the top.

Milk is an example of a ____.

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Milk is a colloid of liquid fat dispersed in water

Melting of wax is a physical change because ____.

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Physical change is a temporary change as the molten wax can solidify on cooling. In this process no new substances are formed.

In aerosol, dispersed phase is gas and dispersion medium is solid.

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Aerosol is a colloid in which dispersion medium is air and dispersed phase is solid or liquid.

How would you separate sulphur from a mixture of iron and sulphur?

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Iron being magnetic will cling to the magnet and get separated from the mixture.

Which of the following solutions exhibit Tyndall effect?

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Tyndall effect is shown by colloids. Starch solution is a colloid.

How would you separate wheat grains from husk and hay?

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Winnowing is the process in which the lighter husk and hay is carried by the wind. So, we get a heap of husk and hay at a small distance away while wheat grains being heavier fall almost vertically to form a separate heap nearby.

In a washing machine, water can be separated from wet clothes by ____.

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The drum of a washing machine creates a centrifugal force as it rotates. This enables the water to separate from the wet clothes.

Heterogeneous mixture can be separated by ____.

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"A heterogeneous mixture contains physically distinct parts and has non-uniform composition.Hence, hand picking, sieving and filtration methods can be used to separate the heterogeneous mixtures.

What is the colour of sulphur crystals?

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Sulphur is a yellow crystalline solid.

Which among the following is a mixture of two elements?

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Sulphur powder and iron filings are elements. Sugar, common salt and water are compounds. Milk is a colloid and air is a mixture.

Which of the following is a metalloid?

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Germanium shows properties of both metal and non-metal, hence,it is a metalloid

Metals are ductile. This statement means ____.

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The property of metals to be drawn into wires or rods, is called ductility

The coloured components present in black ink can be separated by ____.

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The chromatography technique is based on the principle of distribution. The coloured component, which is more soluble in water, rises faster along the strip of filter paper than the others do.

Kerosene can be separated from a mixture of kerosene and water by ____.

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Kerosene and water are immiscible liquids, hence, they can be separated using a separating funnel.

In an unsaturated solution more solute can be dissolved without increasing the amount of the solvent.

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An unsaturated solution is a solution in which some more solute can be dissolved in the given solvent at a given temperature

In which of the following solvents is sugar soluble?

Correct! Wrong!

Sugar is soluble in water and insoluble in organic solvents like benzene, carbon tetrachloride and carbon disulphide, since, sugar is a polar solute

CBSE Class 9th Science 2 - Is Matter Around Us Pure MCQs
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