The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10-16 m2S-1 and it is 1.94 × 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is_________________?
(A) 130
(B) 180
(C) 230
(D) 250
Sand used to stop the green sand from sticking to the pattern is termed as the ______________ sand?
(A) Parting
(B) Synthetic
(C) Loam
(D) Dry
For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be___________________?
(A) 100% indirect reduction
(B) 100% direct reduction
(C) 50-60% indirect reduction
(D) 30-40% indirect reduction
Tip of the match stick contains a mixture of________________?
(A) K + S
(B) K + S + K2Cr2O7
(C) S + K2Cr2O7 + White P
(D) None of these
Internal energy of a gas obeying Van-Der-Waals equation of state, [p + (a/v2)] (V – b) = RT, depends upon its___________________?
(A) Pressure & temperature
(B) Pressure & specific volume
(C) Temperature & specific volume
(D) Temperature only
The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6) ?
(A) 4.4
(B) 5.6
(C) 8.4
(D) 2.4
The swift cup test evaluates the following property of a sheet metal ?
(A) Stretchability
(B) Drawability
(C) Bendability
(D) None of these
LVDT used for displacement measurement is a/an _______________ Transducer?
(A) Passive
(B) Active
(C) Capacitive
(D) None of these
Cold chisel‟s hammers are made of___________________?
(A) High speed steel
(B) High carbon steel
(C) Forged steel
(D) Mild steel
Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting) ?
(A) V/A
(B) V/A2
(C) V2/A
(D) V2/A2