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Give some examples of Tyndall effect observed in your surroundings?

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प्रश्न

Give some examples of the Tyndall effect observed in your surroundings?

संक्षेप में उत्तर
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उत्तर

Examples of the Tyndall effect:

  1. When light rays enter into a dark room through a hole or a small window.
  2. Sunlight passes through a group of trees in the forest.
  3. Path of light rays seen in front of the projector in a cinema hall.
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अध्याय 2: Is Matter Around Us Pure - Short Answer Questions [पृष्ठ १६]

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एनसीईआरटी एक्झांप्लर Science Exemplar [English] Class 9
अध्याय 2 Is Matter Around Us Pure
Short Answer Questions | Q 27. | पृष्ठ १६

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संबंधित प्रश्न

Which one is a kind of matter:


An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.


Name a metal which is soft and a non-metal which is hard.


There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.

  1. What type of substance could X be ? Name one substance like X.
  2. What type of substance could Y be ? Name one substance like Y.
  3. What type of substance could Z be ? Name one substance like Z.
  4. Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
  5. Name the three groups into which all the substances like Y are divided on the basis of their properties.

A, B and C are all liquids. Liquid A has a comparatively low boiling point. On heating, liquid A vaporises completely without leaving behind any residue. Liquid A is being used increasingly as a fuel in motor vehicles either alone or by mixing with petrol. Liquid B has a very high boiling point. It also vaporises completely on heating, without leaving any residue. Liquid B is a conductor of electricity and used in making thermometers. Liquid C has a moderate boiling point. On heating, liquid C vaporises leaving behind a white solid D which is used in cooking vegetables. The condensation of vapours from C give a liquid E which turns anhydrous CuSO4 to blue.

(a) Which liquid could be an element ? Name this element.

(b) Which liquid could be a mixture ? Name this mixture.

(c) Which liquid could be a compound ? Name this compound.

(d) What could the solid D be ?

(e) What do you think is liquid E ?


In what respects does a true solution differ from a colloidal solution ?


Classify the following into solutions, suspensions and colloids :

Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.


How would you prepare a saturated solution of sodium chloride in water at 25°C ? What will happen if this  solution is cooled to 10°C ?


One of the following does not show Tyndall effect. This one is :


Tincture of iodine has antiseptic properties. This solution is made by dissolving :


Name the property of one of the constituents which can be used to separate a mixture of salt and iodine


Fill in the following blanks with suitable words :

Miscible liquids are separated by .....................


How is the impurity of iron present in several substances removed in industries ?


State whether true or false. If false, correct the statement.

Oil and water are immiscible with each other.


Stars including Sun are covered in ______.


Which among the following is not a matter?


Atoms or groups of atoms having a charge are called ______.


The physical state of water at 373 K is ______.


Define the term matter.


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