Q1. Pick out the wrong statement.
(A) Copper is the metal having the highest electronic conductivity
(B) Hardenability & Weldability of metals are inversely related
(C) Covalent bonding formed by sharing of electrons is present in all semi-conductor materials
(D) Glass transition temperature applies to ‘polymers’ but not to ‘glasses’
Q2. Which of the following phenomenon will exhibit the minimum heat transfer?
(B) Forced convection in air
(C) Free convection in air
(D) Conduction in air
Q3. Out of the following, which will fracture most readity, when hit with a hard hammer?
(C) German silver
(D) Cast iron
Q4. Which of the following metals cannot be hot worked at room temperature?
Q5. __________ stress cannot be sustained by a fluid in equilibrium.
(D) None of these
Q6. Which of the following equipments is used for liquid dispersion?
(A) Packed column
(B) Venturi scrubber
(C) Bubble cap plate column
(D) Wetted wall column
Q7. Oxyacetylene reducing flame is used while carrying out welding on
(A) Alloy steel
(B) Grey cast iron
(C) Mild steel
(D) High carbon steel
Q8. Limestone is added in the blast furnace (during pig iron manufacture) to
(A) Form slag by combining with impurities
(B) Supply heat by undergoing exothermic reaction with impurities
(C) Reduce the coke consumption
(D) Reduce slag viscosity
Q9. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
(C) Remain constant
(D) Increases to a maximum before decreasing
Q10. The boiling & freezing points on a newly defined temperature scale in degree ‘D’ are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.