English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Which of the following do not exhibit Tyndall effect ?

Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.

Which of the following are chemical changes and which physical ? Give reason.

1. a glass bottle breaking
2. coal burning in air
3. making a cake
4. wool being knitted into a sweater

Which of the following are chemical changes and which physical ? Give reason.

1. a glass bottle breaking
2. coal burning in air
3. making a cake
4. wool being knitted into a sweater

Define solubility of a substance. How does it vary with temperature ?

Define solubility of a substance. How does it vary with temperature ?

What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?

What do you understand by the statement " the solubility of copper sulphate in water at 20°C is 20.7 g" ?

What is the effect of temperature on the solubility of solids in liquids ?

What is the effect of temperature on the solubility of solids in liquids ?

What is meant by a solution? 

What is meant by a solution? 

What is a suspension ? Give two examples of suspensions.

What is a suspension ? Give two examples of suspensions.

What is a colloid ? Give two examples of colloids (or colloidal solutions)

What is a colloid ? Give two examples of colloids (or colloidal solutions)

Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?

Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?

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 ?

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 is a solid foam. This one is :