Stop welding is known as which welding ?

  1. Pressure
  2. Forge
  3. Fusion
  4. Thermit

The temperature required for welding is

  1. 1000 °C
  2. 2000 °C
  3. 2500 °C
  4. 3000 °C

Oxygen cylinder is made of

  1. Seamless steel
  2. Stainless steel
  3. Carbon steel
  4. None of these

What is colour of acetylene gas cylinder ?

  1. Red
  2. Black
  3. Green
  4. Yellow

Which type of thread is in oxygen cylinder regulator ?

  1. Acme
  2. Double start
  3. Left hand
  4. Right hand