Gases used in welding are:
- AOxygen and hydrogen
- BOxygen and nitrogen
- COxygen and acetylene
- DHydrogen and acetylene
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (c) Oxygen and acetylene
Explanation
Oxy-acetylene welding burns acetylene (C₂H₂) in pure oxygen. The flame reaches about 3200 °C, hot enough to melt and join steel.
The same flame is used to cut metals (gas cutting).