nature of matter and composition - Category wise Question and Answer Practice Test with Solutions

Question : 21

Which of the following is an example of a homogeneous substance?

a) Oil-water solution

b) Copper sulphate

c) Granite

d) Muddy water

Question : 22

Tails of comets are visible due to

a) Brownian movement

b) Tyndall Effect

c) Reflection

d) None of these

Question : 23

Which of the following statements is true about a colloidal system?

a) It can be made out of two gases

b) It consists of one phase only

c) It carries a net electric charge

d) It is electrically neutral as a whole

Question : 24

On passing through a colloidal solution, the beam of light gets ..........

a) scattered

b) refracted

c) reflected

d) absorbed

Question : 25

A change is said to be a chemical change when

a) it is accompanied by change in physical properties

b) it is accompanied by formation of new substances

c) it is accompanied by energy change

d) All the above are correct