The cathode in an electrochemical cell always carries____________________?
(A) Negative charge
(B) Positive charge
(C) Zero charge
(D) Positive or negative charge depending upon the nature of the cell
Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young’s modulus, G = Modulus of rigidity or shear modulus v = Poisson’s ratio) ?
(A) E = 2G (1 + v)
(B) E = G (1 + v)
(C) E = G (1 + v)/2
(D) E = 2G (1 + 2v)
Cold chisel & hammers are made of_________________?
(A) High speed steel
(B) High carbon steel
(C) Forged steel
(D) Mild steel
_____________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C ?
(A) Veneering
(B) Galvanising
(C) Electroplating
(D) Calorising
Percentage of argon (by volume) in dry atmospheric air is about________________?
(A) 0.09
(B) 0.3
(C) 0.57
(D) 0.94
Air standard Otto cycle is more efficient than the diesel cycle for the same__________________?
(A) Heat addition & compression ratio
(B) Heat addition & pressure
(C) Compression ratio & pressure
(D) Cylinder dimension & rpm
Hydrogen can be ________________?
(A) Used in I.C. engines as fuel
(B) Liquefied & stored under cryogenic conditions
(C) Produced by electrolysis of water
(D) All (A),
Work required for compression of a gas contained in a cylinder is 7000 kJ. During compression, heat interaction of 3000 kJ causes the surroundings to be heated. Internal energy change of the gas during the compression is __________________ kJ ?
(A) +4000
(B) -4000
(C) 10000
(D) -10000
Electrometallurgical methods of metal extraction is normally used for those metals___________________?
(A) Whose oxide/ore is not reduced by carbon
(B) Which fall in the category of alkali & alkaline earth metals
(C) Which stands higher in the electrochemical series of the metal
(D) All A,