Which one of the following is incombustible ?

Related Mcqs:

1. Which of the following is not used as a bearing material ?

   A. Copper-lead alloys
   B. Babbitts
   C. Bronzes
   D. Cermets

2. Which of the following metals reacts violently with water ?

   A. Mercury
   B. Sodium
   C. Calcium
   D. Magnesium

3. The following type of bonding is strongly directional in solids ?

   A. Vander Waal’s
   B. Ionic
   C. Metallic
   D. Covalent

4. Which of the following is preferred for riveting ?

   A. Lap joint
   B. Butt joint
   C. Either A. or B.
   D. Neither A. nor B.

5. Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA) ?

   A. Styrofoam
   B. Lucite
   C. Perspex
   D. Plexiglass

6. Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog ?

   A. Nitrogen oxides
   B. Hydrocarbons
   C. Both A. & B.
   D. Carbon monoxide

7. Which of the following gases cause global warming ?

   A. Carbon monoxide
   B. Carbon dioxide
   C. Nitrogen
   D. Ozone

8. Which of the following are considered applications of ultrasonic testing ?

   A. Determination of elastic constant
   B. Detection of defects in metal
   C. Measurement of material thickness
   D. None of the above

9. Which of the following properties of a solid is not dependent on crystal imperfection ?

   A. Ductility
   B. Semi-conductivity
   C. Melting point
   D. Yield stress

10. Which of the following has the highest modulus of elasticity (about 7 × 106 kg/cm2) ?

    A. High speed steel
    B. Stainless steel
    C. Tungsten carbide
    D. Superalloys