The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?
(A) Lead
(B) Copper
(C) Aluminium
(D) Wrought iron
Which of the following is not used as a bearing material ?
(A) Copper-lead alloys
(B) Babbitts
(C) Bronzes
(D) Cermets
Pick out the correct combination about the role of various additives used in polymers ?
(A) Plasticiser: increases the polymer strength
(B) Heat stabiliser: increases the maximum service temperature
(C) Fillers: Does not affect the property of polymer but increases its weight
(D) Lubricants: increases the flexibility of polymers
In multipass welds, shot peening is done after each pass to__________________?
(A) Close the surface porosity
(B) Break the continuity of columnar grains
(C) Flatten the weldment
(D) Introduce texture in the weld
Shampoos are commercially not available in the form of ___________________?
(A) Powder
(B) Gaseous mixture
(C) Solution
(D) Emulsion
Which of the following is an ore dressing operation ?
(A) Classification
(B) Smelting
(C) Roasting
(D) None of these
Material of construction of the electrode used in the electric resistance welding is___________________?
(A) Stainless steel
(B) Graphite
(C) Copper
(D) Steel
Normalising does not ______________________ of a metal ?
(A) Improve machinability & tensile strength
(B) Remove internal stresses
(C) Refine the structure
(D) Remove strains caused by cold working
Biological shield in a nuclear reactor is generally provided to protect against the__________________?
(A) α-rays
(B) β-rays
(C) Gamma rays & neutrons
(D) Electrons
The thickness of oxide film is y at time t. If K1, K2 and K3 are the temperature dependent constants, the parabolic law of oxidation is given by __________________?
(A) y2 = 2k1t + k2
(B) y = k1 ln (k2t + k3)
(C) y = k1 t + k2
(D) y = k1t3 + k2