Question:medium

Which of the following will show “Tyndall effect”?

Updated On: Jan 19, 2026
  • Salt solution
  • Milk
  • Copper sulphate solution
  • Starch solution
Show Solution

The Correct Option is B, D

Solution and Explanation

The Tyndall effect is an optical phenomenon where light is scattered by particles in a colloid. This scattering causes a beam of light to become visible inside the medium which contains these particles. Only certain types of mixtures can exhibit this effect. Let us analyze each of the given options to determine which will show the Tyndall effect:

  1. Salt solution: A salt solution is a homogeneous mixture in which salt is completely dissolved in water. Since the particles are at the molecular level, they are too small to scatter light. Therefore, a salt solution will not show the Tyndall effect.
  2. Milk: Milk is a colloid in which fat particles are dispersed in water. These particles are large enough to scatter light, making the light beam visible when passed through. Hence, milk exhibits the Tyndall effect.
  3. Copper sulphate solution: Similar to the salt solution, copper sulphate when dissolved in water forms a homogeneous solution. The particles are at the ionic level and do not scatter light. Thus, copper sulphate solution does not show the Tyndall effect.
  4. Starch solution: A starch solution is a colloid where starch particles are dispersed in water, large enough to scatter light. Therefore, a starch solution will exhibit the Tyndall effect.

In conclusion, among the options, both milk and starch solution are colloidal and will exhibit the Tyndall effect due to the presence of particles that can scatter light when passed through them. Therefore, the correct answers are Milk and Starch solution.

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Questions Asked in CBSE Class IX exam

(Street Plan) : A city has two main roads which cross each other at the centre of the city. These two roads are along the North-South direction and East-West direction.

All the other streets of the city run parallel to these roads and are 200 m apart. There are 5 streets in each direction. Using 1cm = 200 m, draw a model of the city on your notebook. Represent the roads/streets by single lines. There are many cross- streets in your model. A particular cross-street is made by two streets, one running in the North - South direction and another in the East - West direction. Each cross street is referred to in the following manner : If the 2nd street running in the North - South direction and 5th in the East - West direction meet at some crossing, then we will call this cross-street (2, 5). Using this convention, find: 

(i) how many cross - streets can be referred to as (4, 3). 

(ii) how many cross - streets can be referred to as (3, 4).

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