CBSE Class 9 Science Exploring Mixtures and Their Separation (Class 9 NCERT New) Quiz 7

1. What are suspensions?

A Suspensions are heterogeneous mixtures in which solid particles do not dissolve but remain suspended throughout the bulk of the medium. B Suspensions are homogeneous mixtures in which solid particles dissolve completely in the medium. C Suspensions are solutions where gases are dissolved in liquids. D Suspensions are mixtures where all components are invisible to the naked eye.

2. In a suspension, are the particles of the undissolved substance larger or smaller than the particles present in the solution?

A Larger B Smaller C Same size D Not visible

3. Name two examples of suspensions mentioned in the text.

A Sawdust suspended in water and tea leaves in water. B Salt dissolved in water and sugar dissolved in water. C Milk and water mixture and lemonade. D Copper sulphate solution and vinegar.

4. How can we separate mud from water if filtration is not enough?

A By using techniques such as centrifugation and/or coagulation. B By boiling the mixture. C By adding sugar to the mixture. D By freezing the mixture.

5. What is the process called that involves spinning a mixture in a tube at high speed to separate heavier particles from lighter liquid?

A Centrifugation B Filtration C Evaporation D Distillation

6. Centrifugation is widely used in laboratories to separate the components of blood, such as red blood cells and plasma.

A True B False

7. The spinning game is a folk dance called 'phugadi' in Marathi and 'kikli' in Punjabi. In Hindi, this dance is called:

A Chakkar B Phugadi C Kikli D Garba

8. Select the mixture you would like to separate using this mini centrifuge.

A Blood and plasma B Salt and water C Sand and iron filings D Oil and vinegar

9. Which of the following is an example of a coagulation process used in everyday life?

A Making cheese from milk B Boiling water C Freezing vegetables D Baking bread

10. Fill in the blank: The alum causes the fine suspended particles to clump together. This process is called ________.

A coagulation B evaporation C filtration D condensation