Diamagnetic materials___________________?
(A) Are magnetised by eddy currents only
(B) Are non-magnetic and cannot be magnetised
(C) Are magnetised in direction opposite to the magnetic field
(D) Can be magnetised in one direction only
The hardenability of steel decreases with__________________?
(A) Decrease in dislocation density
(B) Increase in solutionising temperature
(C) Increase in strength
(D) Decrease in grain size
For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?
(A) Temperature – entropy
(B) Temperature – pressure
(C) Enthalpy – entropy
(D) Enthalpy-pressure
Brittleness induced due to the presence of sulphur in steel can be reduced by adding______________?
(A) Manganese
(B) Magnesium
(C) Vanadium
(D) Copper
Closeness of packing is maximum in case of ____________________ crystal lattice?
(A) Face centred
(B) Simple cubic
(C) Body centred
(D) None of these
In the Bayer’s process, bauxite is digested under pressure using ___________________?
(A) H2SO4
(B) NaOH
(C) NH3
(D) HCl
____________________ of hard alloy and tool steel is done to make it easily machinable ?
(A) Case carburising
(B) Tempering
(C) Normalising
(D) Annealing
At 100% relative humidity, the dew point temperature of moist air is_________________?
(A) Less than the wet bulb temperature
(B) More than the wet bulb temperature
(C) Equal to the wet bulb temperature
(D) Equal to the ambient temperature
In a neutral solution__________________?
(A) H+ ions are absent
(B) OH- ions are absent
(C) Both H+ and OH- ions are present in very small but equal concentration
(D) None of these
Elimination of brittleness resulting from welding of saw blades is done by __________________ of the welded portion ?
(A) Annealing
(B) Toughening
(C) Work hardening
(D) Tempering