Why does the smell of hot sizzling food reach you several metres away, but to get the smell from cold food you have to go close?

Important Questions on Test Paper 2

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 2

In the absence of a refrigerator, butter is kept wrapped in a wet cloth during summer. Why?

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 3

State the types of mixture. Give examples for each type.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 4

Give one example of each of the following:
a) a solution of a gas in liquid.
b) a solution of two gases.
c) a solution of two liquids.
d) a solution of two solids.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 5

How will you differentiate between a suspension and a colloid? Give one example of each.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 6

Name the technique to separate

a. butter from curd

b. salt from sea water

c. camphor from salt.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 1

While determining the boiling point of water in the laboratory, the beaker containing hot water accidentally fell on the hand of a student. A fellow student immediately put cold water on his hand and then placed ice cubes on his hand. He then took the student to the school dispensary for giving him first aid.
a. Define boiling point.
b. Why does temperature remain constant during boiling?
c. How does boiling differ from evaporation?
d. State the values displayed by the fellow student.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 2

List the points of differences between homogeneous and heterogeneous mixtures.

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE CHEMISTRY 9>Chapter 7 - Test Paper 2>Test Paper 2>Q 3

Explain the following giving examples:
a. saturated solution
b. pure substance
c. colloid
d. suspension.