CURIOUSITY QUIZ: IS MATTER AROUND US PURE

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Test Your knowledge on 'Is Matter Around Us Pure' prepared exclusively according to the NCERT science curriculum for Class-9 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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A suspension of fine liquid particles in a gaseous medium like air (When the dispersion phase is liquid and the dispersing medium is air; Example: Fog or Mist) is called :

1 point

Foam

Emulsion

Gel

Aerosol

Clear selection

When both the dispersion phase and the dispersing medium are liquids ( Example: Milk where liquid fat particles are dispersed in Water), this state is called :

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Foam

Emulsion

Suspension

Gel

Clear selection

Brass is an alloy of :

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Copper (50 %) and Zinc (50%)

Copper (30 %) and Zinc (70%)

Copper (70 %) and Zinc (30%)

Copper (40 %) and Zinc (60%)

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What is TRUE about a Solution ?

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A solution is a homogeneous mixture.

The particles of a solution are smaller than 1 nm (10-9 metre) in diameter. So, they cannot be seen by naked eyes.

Because of very small particle size, they do not scatter a beam of light passing through the solution. So, the path of light is not visible in a solution.

The solute particles cannot be separated from the mixture by the process of filtration. The solute particles do not settle down when left undisturbed, that is, a solution is stable.

All the above statements are True.

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What is TRUE about a Suspension ?

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Suspension is a heterogeneous mixture.

The particles of a suspension can be seen by the naked eye.

The particles of a suspension scatter a beam of light passing through it and make its path visible.

The solute particles settle down when a suspension is left undisturbed, that is, a suspension is unstable.

All the above statements are true.

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The phenomenon of Scattering of light by particles of a Suspension is called :

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Raleigh Scattering

Tyndal Effect

Raman Effect

Radiation

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Why Tyndal Effect is not observed when light rays pass through Copper Sulphate solution?

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Particle size in Copper Sulphate solution is too large to diffract light.

Particle size in Copper Sulphate solution is too small to diffract light.

Particle size in Copper Sulphate solution is too large to scatter light.

Particle size in Copper Sulphate solution is too small to scatter light.

Clear selection

Which method is generally used to separate Butter (Cream) from Milk in a dairy?

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Filtration

Decantation

Centrifugation

Distillation

Clear selection

What is the name of the device which is used to separate two or more immiscible liquids from its mixture ?

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Filtration Funnel

Fractional Distillation Cylinder

Hydrometer

Separating Funnel

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What is the name of the method which is used to separate two or more miscible liquids from its mixture?

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Chromatography

Centrifugation

Distillation

Filtration

Clear selection

A mixture of common salt and camphor can be separated by the method of :

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Centrifugation

Separating Funnel

Decantation

Sublimation

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This is a Laboratory technique used for separation of those solutes that dissolve in the same solvent ( Example: Separation of constituent colour dyes from the ink of a fountain pen)

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Chromatography

Sublimation

Centrifugation

Filtration

Clear selection

What is the method called in which a mixture of two or more miscible liquids differing slightly in their boiling points are separated ?

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Distillation

Decantation

Sublimation

Fractional Distillation

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Who was the first to establish an experimentally useful definition of an element. He defined an element as a basic form of matter that cannot be broken down into simpler substances by chemical reactions :

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Joseph-Louis Proust

John Dalton

Robert Boyle

Antoine Laurent Lavoisier

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The elements are ductile . This means that , elements :

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Can be hammered into thin sheets.

Can be drawn into wires.

Make a ringing sound when hit.

Conduct heat and electricity

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The elements are malleable . This means that , elements :

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Make a ringing sound when hit.

Can be hammered into thin sheets.

Conduct heat and electricity.

Can be drawn into wires.

Clear selection

The elements are sonorous . This means that , elements :

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Can be drawn into wires.

Can be hammered into thin sheets.

Conduct heat and electricity.

Make a ringing sound when hit.

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Elements such as Boron, Silicon, Germanium are examples of :

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Metals

Non metals

Metalloids

None of these

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This is the only non-metallic element to exist in liquid state :

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Chlorine

Mercury

Bromine

Iodine

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This is the only metallic element to exist in liquid state :

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Metals

Mercury

Bromine

None of these

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This is a silvery grey metal , but turns to liquid state at body temperature when kept over hand:

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Sodium

Gallium

Bromine

Lithium

Clear selection

This metal is so soft that it can be easily cut with a knife:

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Sodium

Calcium

Boron

Magnesium

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Which is the hardest non-metal?

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Diamond

Calcium Carbonate

Silicon Dioxide

Iron Oxide

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Which is the most malleable metal?

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Gold

Silver

Platinum

Aluminum

Clear selection

Which is having the highest electrical conductivity?

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Gold

Silver

Platinum

Aluminum

Clear selection

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