__________ rubber is generally used for making 'O' rings used for vacuum sealings.

A. Natural

B. Neoprene

C. Butadiene

D. Nitrile

Please do not use chat terms. Example: avoid using "grt" instead of "great".

You can do it
  1. Material of construction of the electrode used in the electric resistance welding is
  2. What is the value of entropy at 273°K?
  3. Air standard Otto cycle is more efficient than the diesel cycle for the same
  4. Blasting of tri-nitro-toluene (TNT) is done by mixing it with ammonium
  5. __________ is not a case hardening process.
  6. Air-petrol ratio for maximum power generation in spark ignition engine is about
  7. Most important property of steels for use in automobile bodies is the
  8. Silicon in steel
  9. Oxyacetylene reducing flame is used while carrying out welding on
  10. Stellite is a __________ material.
  11. Shaft/rotor speed is most accurately measured by a
  12. Pick out the wrong statement.
  13. __________ is the most suitable lubricant for drawing mild steel wires?
  14. Iron content in Indian iron ore is about __________ percent.
  15. Change in volume of metals from absolute zero temperature to their melting points is
  16. Which of the following are considered applications of ultrasonic testing?
  17. __________ the exhaust gas is an indication of the incomplete combustion of fuel.
  18. All of the following alloying elements of steel increases hardness but sacrifice ductility, except
  19. Batch process is preferred over continuous process, when the
  20. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
  21. Lead pencil contains
  22. Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial…
  23. Direct conversion of thermal energy to electrical energy is facilitated by the
  24. Corrosion rate cannot be lowered by reducing the __________ of the corroding medium.
  25. The activity co-efficient of the solute in a dilute solution
  26. Copper deposits are found in India at the following location:
  27. The most prominent single cause of corrosion in boiler-tubes, drums, economisers and steam superheaters…
  28. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
  29. Out of the following, the most malleable material is
  30. Constituents of stellite are