English Medium कक्षा ९ - CBSE Question Bank Solutions for Science

Write down the composition of air.

Name the quantity whose unit is :
(a) kilowatt
(b) kilowatt-hour

How does oxygen and carbon dioxide remain nearly constant in the atmosphere?

How would you separate a mixture of sugar and salt?

How will you separate a mixture of sodium chloride and sand ?

How will you separate a mixture of iron fillings and sulphur powder without using carbon disulphide ?

A mixture contains water, kerosene and sand. How will you separate this mixture ?

You are given a mixture of water, groundnut oil and common salt. How will you separate groundnut oil and common salt from it ?

Discuss the method of separating a mixture containing chalk powder, iron filings and naphthalene.

How will you separate common salt, sand and iron filings from their mixture ?

How will you separate a mixture of kerosene oil and water ? Explain with the help of a labelled diagram.

How will you separate a mixture of cooking oil (groundnut oil) and water ?

How will you separate a mixture of mercury, oil and water ?

Which of the following can be separated by using a separating funnel and which cannot be separated by using a separating funnel ?

1. water and kerosene mixture
2. water and acetone mixture

Give reasons for your answer.

Derive the relation between commercial unit of energy (kWh) and SI unit of energy (joule).