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9th CBSE
IMPORTANT
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Tyndall's effect can be observed in a colloidal solution. Consider light scattering in the following:
I. When sunlight passes through the canopy of a dense forest.
II. When normal light passes through copper sulphate solution.
III. When normal light passes through milk.
IV. When a fine beam of light enters a room through a small hole.
Tyndall's effect is observed in

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Important Questions on Is Matter Around Us Pure?

EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 6
A colloid consists of the dispersed phase and dispersed medium. Aerosol is one type of colloid. Aerosol is made up of which of the following combination?
I. Gas in liquid
II.Liquid in gas
III. Solid in gas
IV.Gas in solid
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 8
Among the following statement, point out the incorrect separation technique.
I.Separation of colloidal particles from solution- centrifugation.
II.Separation of two miscible liquids- separating funnel.
III.Separation of pure substance from its impure form- crystallisation.
IV.Separation of components with the help of the same solvent- chromatography.
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 9
Which of the following are chemical changes?
I. Decaying of wood.
II. Burning of wood.
III. Sawing of wood.
IV. Hammering of a nail into a piece of wood.
EASY
9th CBSE
IMPORTANT
All In One SCIENCE CBSE Class IX>Chapter 2 - Is Matter Around Us Pure?>Challengers*>Q 10
White gold used in jewellery contains two elements, gold and palladium. A jeweller has two different samples that are both identical in appearance and have a uniform composition throughout. What can be said about the samples?