Fuels can be classified as:
Only liquids
Solids, liquids or gases
Only liquids and solids
Only gases
On the basis of physical state, fuels can be classified as solids, liquids or gases.
Sound can travel through :
(a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases
Question 1 Sound can travel through (a) gases only (b) solids only (c) liquids only (d) solids, liquids and gases.