Friday, August 24, 2012

Engineering Materials Objective Questions Answers

1. The resistance of the most of the conducting materials __ with increase in temperature
a) Increases
b) Decreases
c) Remain same
d) None of the above

2. In metals the type of bond present is:
a) Metallic bond
b) Covalent bond
c) Ionic bond
d) None of the above

3. The relative permeability of the super conductor materials is:
a) Zero
b) +1
c) -1
d) Infinity

4. Forbidden band is largest in:
a) Conductor
b) Semi Conductor
c) Insulator
d) None of the above

5. Annealing of metals
a) Removes internal stresses
b) Increases conductivity
c) Increases the grain size
d) Both (a) and (b)

6. Which of the following is the best electrical conductor
a) Copper
b) Aluminium
c) Silver
d) Cadmium Copper

7. The property of materials by which it can be rolled into sheets is called as:
a) Malleability
b) Elasticity
c) Ductility
d) Plasticity

8. The formation of oxide film on the metal is due to atmospheric exposure reduces:
a) Creep limit
b) Stiffness
c) Toughness
d) None of the above

9. Gold, Silver and Copper are good conductors because their outer orbits contains:
a) One electron
b) Pair of electrons
c) More than two electrons
d) None of the above

10. Solder is an alloy of
a) Lead and tin
b) Aluminium and Copper
c) Copper and Zinc
d) Lead and Zinc