1.
Option B
2.
Option B
3.
Option A
4.
Option C
5.
Option A
6.
Option B
7.
Option C
8.
Option D
9.
Option B
10.
Option C
11.
Option B
12.
Option B
13.
Nitrogen, air, oxygen, carbon dioxide etc are gases.
14.
Helium is lighter than air.
15.
Option A
16.
Option A
17.
Option B
18.
Liquids have a definite shape but no definite volume.
19.
Option A
20.
Option D