Related Mcqs:

1. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are _______________ respectively ?

   A. 70 & 30
   B. 30 & 70
   C. 50 & 50
   D. 90 & 10

2. In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?

   A. Jet of water at high pressure
   B. Blast of air
   C. Mixture of water and air
   D. Rain of molten lead

3. The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?

   A. 2300 J
   B. 4600 J
   C. 230 J
   D. 2.3 × 106 J

4. Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than ?

   A. 5
   B. 10
   C. 20
   D. 35

5. Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of _______________ gms of zinc per m2 of steel strip ?

   A. 5-10
   B. 1000-1500
   C. 120-500
   D. 1500-3000

6. On decreasing the grain size of a polycrystalline material, the property most likely to deteriorate is__________________?

   A. Creep
   B. Toughness
   C. Tensile strength
   D. Fatigue

7. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and _____________ is not affected ?

   A. Impact strength
   B. Percent elongation
   C. Hardness
   D. Both B & C

8. _______________ test determines the yield strength, Young’s modulus of elasticity, percentage reduction in area & percentage elongation of a material ?

   A. Tensile
   B. Fatigue
   C. Impact
   D. None of these

9. Resilience of a bolt can be increased by increasing its __________________?

   A. Length
   B. Shank diameter
   C. Head diameter
   D. None of these

10. Which of the following is not an ore of copper ?

    A. Cryolite
    B. Azurite
    C. Chalcopyrite
    D. Malachite