Which of the following is the hardest material ?

Related Mcqs:

1. The hardest material just prior to diamond in Mhos scale is_________________?

   A. Topaz
   B. Carborundum
   C. Corundum
   D. Calcite

2. Hardest material so far found is__________________?

   A. Diamond
   B. Graphite
   C. Carborundum
   D. Pumice stone

3. The hardest material just prior to diamond in Mho’s scale is___________________?

   A. Topaz
   B. Carborundum
   C. Corundum
   D. Calcite

4. Which of the following is the hardest _______________?

   A. Cementite
   B. Pearlite
   C. Austenite
   D. Ferrite

5. Hardest materials so far found is_________________?

   A. Diamond
   B. Graphite
   C. Carborundum
   D. Pumice stone

6. Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the__________________?

   A. Ultimate tensile strength (U.T.S.)
   B. Endurance limit
   C. Elastic limit
   D. None of these

7. Which of the following is not used as the ceramic material in „cermets‟?

   A. Silicides
   B. Oxides
   C. Carbides
   D. Nitrides

8. Which of the following is the most elastic material ?

   A. Plastic
   B. Glass
   C. Steel
   D. Rubber

9. Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?

   A. Monel
   B. Stainless steel
   C. Graphite
   D. Kel-F and Teflon

10. Which of the following heat treatment processes is used for softening the hardened material ?

    A. Normalising
    B. Tempering
    C. Annealing
    D. None of these