set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Wooden pencil used for writing contains

a) Salt

b) Graphite

c) Lead

d) Cane sugar

Question : 2

Brass is an example of

a) homogeneous mixture

b) element

c) compound

d) heterogeneous mixture

Question : 3

When dispersed phase is liquid and dispersion medium is gas then the colloidal system is called

a) jellies

b) clouds

c) smoke

d) emulsions

Question : 4

The process used to separate oil and water is

a) separating funnel

b) sublimation

c) distillation

d) chromatography

Question : 5

Select the one that is not a chemical change ?

a) Dissolution of oxygen in water.

b) Dissolution of carbon dioxide in water.

c) Dissolution of ammonia in water.

d) None of these is a chemical change.

Question : 6

What type of mixture is smoke?

a) Liquid mixed with a gas

b) Solid mixed with a gas

c) Gas mixed with a gas

d) Gas mixed with a liquid and a solid