36. Large scale fire on fuel gas line is normally extinguished by
A. Water
B. Steam
C. Foam
D. Nitrogen
✅ The correct answer is option D.
38. Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant ‘K’ is
A. 10 atmv
B. 10⁵ atm⁻¹
C. 10 (dimensionless)
D. 10⁵ (dimensionless)
✅ The correct answer is option B.
40. Number of electrons in the outermost orbit of a semi-conductor is
A. 2
B. 4
C. 6
D. 8
✅ The correct answer is option B.
43. Pick out the wrong statement about nucleate boiling.
A. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface
B. Surface temperature is greater than the saturation temperature of the liquid
C. Heat transfer from the surface of the liquid is less than that in film boiling
D. The temperature is less than that of film boiling
✅ The correct answer is option D.
46. Semi-conductors normally employ __________ bonding.
A. Co-ordinate
B. Ionic
C. Covalant
D. Metallic
✅ The correct answer is option C.
49. In the floatation process, pine oil is used as the
A. Collector
B. Activator
C. Frother
D. Depressant
✅ The correct answer is option C.
52. Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.
A. Natural
B. Induced
C. Forced
D. Chimney
✅ The correct answer is option A.
55. If the pH value of a solution of sodium chloride is 7; then what will be the pH value of the solution after its electrolysis ?
A. 7
B. < 7
C. > 7
D. 0
✅ The correct answer is option C.
58. Joining of thin foils is preferred to be done by
A. Gamma rays
B. X-rays
C. Microwaves
D. Gas welding
✅ The correct answer is option C.
3. In which of the following reactions, application of vacuum will help ?
A. Number of gas molecules in the product side is more than that on the reactant side
B. Number of gas molecules in the reactant side is more than that on the product side
C. Number of gas molecules are the same on both the reactant & the product side
D. None of the above
✅ The correct answer is option D.