Page 1 - CBW

SAI International School

Competency Based Worksheet
Subject – Chemistry

Chapter – Separation of Substances

Class- VI

Q. No. Questions

1. What process is used to separate grains from their husk?
a) Winnowing
b) Sieving
c) Threshing
d) Handpicking
2. Which of the following is a pure substance?
a) Air
b) Milk
c) Iron
d) Soil
3. Which of the following is an example of a compound?
a) Gold
b) Water
c) Oxygen
d) Nitrogen
4. Which of the following is an example of a homogeneous mixture?
a) Sand and water
b) Oil and water
c) Salt dissolved in water
d) Rice and pulses
5. The handpicking method is most suitable for separating this type of mixture:
a) Homogeneous mixtures
b) Heterogeneous mixtures
c) Solutions
d) Colloids
Choose the correct option for the following: (For questions- 6 and 7)
a) If both Assertion and Reason are correct and Reason is the correct explanation of
Assertion.
b) If both Assertion and Reason are correct, but Reason is not the correct explanation of
Assertion.
c) If Assertion is correct but Reason is incorrect.
d) If assertion is incorrect but Reason is correct.
e) If Assertion and Reason both are incorrect.
6. Assertion (A): Husk and flour can be separated by the process of sieving.
Reason (R): Sieving is used when the particle sizes of the two components in the mixture
differ.

7. Assertion (A): For separation of heavier and lighter components of a mixture by wind or by
blowing air.