Sustainable Building Materials Questions & Answers - Set 02 - ObjectiveBooks

Sustainable Building Materials Questions & Answers - Set 02

Practice Test: Question Set - 02

1. In cold working of metal as compared to its hot working
    (A) Cracks and blow holes are eliminated
    (B) Ductility and impact strength improves
    (C) Appreciable strain hardening is produced
    (D) Yield stress, hardness and fatigue strength is not at all affected

2. Which one occupies the lowermost position in the electromotive series of metals?
    (A) Aluminium
    (B) Noble metals (Ag, Pt, Au)
    (C) Zinc
    (D) Alkali metals (K, Na, Li)

3. 'Semi steel' is
    (A) Produced by adding 10-20% steel to the cupola charge
    (B) Stronger than cast iron
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

4. Spark plugs are made of
    (A) High alumina ceramic
    (B) Metallic carbides
    (C) Corundum
    (D) Carborundum

5. How many molecules per unit cell are there in a face centered cubic lattice?
    (A) 2
    (B) 4
    (C) 6
    (D) 8

6. The crystal structure of most of the common metals is
    (A) Orthorhombic
    (B) Cubic
    (C) Hexagonal
    (D) None of these

7. Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.
    (A) Ultimate
    (B) Yield point
    (C) Proof
    (D) None of these

8. Lead pipe is
    (A) Especially resistant to solutions containing H2SO4
    (B) Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
    (C) Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
    (D) All (a), (b) and (c)

9. __________ is a donor impurity for semi-conductors.
    (A) Boron
    (B) Antimony
    (C) Gallium
    (D) None of these

10. Pick out the wrong statement.
    (A) Pure rubber is as useless as pure gold as a material of construction
    (B) Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
    (C) Copper has poor weldability
    (D) Reinforced plastics are made from both thermoplastic as well as thermosetting plastics

11. Caustic soda is transported in __________ lined containers.
    (A) Glass
    (B) Nickel
    (C) Neoprene
    (D) Either (b) or (c)

12. Cast iron is having very high
    (A) Proximity between its elastic limit and ultimate breaking strength
    (B) Ductility
    (C) Tensile strength
    (D) All (a), (b) and (c)

13. When iron is rusted, it is
    (A) Converted to a fine powder
    (B) Reduced
    (C) Oxidized
    (D) None of these

14. 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

15. High speed steel tools retain their hardness upto a temperature of __________ °C.
    (A) 500
    (B) 750
    (C) 900
    (D) 1100

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