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

Question : 11 [CDS]

Which one of the following is correct? Butter is

a) a molecular solid

b) a supercooled oil

c) an emulsion

d) None of these

Question : 12

Select the one that is a chemical change.

a) Cooking of food

b) Freezing of water

c) Melting of wax

d) None of these

Question : 13

The oxide of which of the following elements is used as a coolant?

a) Carbon

b) Silicon

c) Nitrogen

d) Phosphorus

Question : 14

Which one among the following is not a mixture?

a) Brass

b) Graphite

c) Glass

d) Steel

Question : 15

A sample contains two substances and has uniform properties. The sample is

a) an element

b) a heterogeneous mixture

c) a compound

d) a homogeneous mixture