A. 130
B. 180
C. 230
D. 250
Related Mcqs:
- Diffusion co-efficient of a metal in a solid solution depends upon its ?
A. Composition
B. Temperature
C. Both A. & B.
D. Neither A. nor B. - For the irreversible reaction, Ca+ 2C = Ca C2 , Δ H°298 = – 60000 J . mole-1 . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be__________________?
A. 30,000 J
B. 60,000 J
C. 90,000 J
D. 2,40,000 J - Which of the following phenomenon/ phenomena is/are diffusion controlled ?
A. Dislocation climb
B. Cross-slip
C. Twinning
D. Recrystallisation - Direct conversion of thermal energy to electrical energy is facilitated by the____________________?
A. Fuel cells
B. Photo voltaic cell
C. Magneto hydrodynamic generator
D. None of these - The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ?
A. 2300 J
B. 4600 J
C. 230 J
D. 2.3 × 106 J - Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50% B is_______________?
A. R ln 2
B. -R ln 2
C. 3 R ln 2
D. -3R ln 2 - The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be________________?
A. 3171Pa
B. 3567Pa
C. 1.01 × 105Pa
D. 5000Pa - The activity of pure hydrogen gas at 1000°C and 5 atm pressure_________________?
A. Is always less than 1
B. Is always greater than 1
C. Can be 5
D. Depends on the choice of the standard state - 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 - Metallic surveying tapes are made of _____________ which has a low co-efficient of expansion & enough strength ?
A. Invar
B. Hastelloy
C. Duralumin
D. Monel metal
