Practice Pakistan's most useful MCQs for competitive exams

Clausius Clapeyron equation applies to the _____________ process?

• (A)  Sublimation
• (B)  Melting
• (C)  Vaporisation
• (D)  All

Answer

Submitted By :Ali Uppal

80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?

• (A)  0.00
• (B)  0.18
• (C)  0.24
• (D)  1.00

Answer

Submitted By :Ali Uppal

The viscosity of water at room temperature may be around one ___________________?

• (A)  Centipoise
• (B)  Poise
• (C)  Stoke
• (D)  Both

Answer

Submitted By :Ali Uppal

_________________ chart is a graph related to Antoine equation ?

• (A)  Ostwald
• (B)  Cox
• (C)  Mollier’s
• (D)  Enthalpy-concentration

Answer

Submitted By :Ali Uppal

The molar composition of a gas is 10% H2, 10% O2, 30% CO2 and balance H2O. If 50% H2O condenses, the final mole percent of H2 in the gas on a dry basis will be_______________?

• (A)  10%
• (B)  5%
• (C)  18.18%
• (D)  20%

Answer

Submitted By :Ali Uppal

The atomic weight of helium is 4 times that of hydrogen. Its diffusion rate as compared to hydrogen will be _____________ times?

• (A)  1/2
• (B)  4
• (C)  √2
• (D)  1/4

Answer

Submitted By :Ali Uppal

If a solution of eutectic composition is cooled, _______________ reaching the eutectic temperature ?

• (A)  The solvent begins to freeze out even before
• (B)  It will undergo no change until
• (C)  It will not solidify even on
• (D)  None of these

Answer

Submitted By :Ali Uppal

Assuming applicability of ideal gas law, the pure component volume of the vapor in a saturated gas can be calculated from theoretical relationship. The volumetric composition of a vapor saturated gas is independent of the___________________?

• (A)  Nature of the liquid
• (B)  Nature of the gas
• (C)  Temperature of the liquid
• (D)  Total pressure

Answer

Submitted By :Ali Uppal

The most blister form of copper is__________?

• (A)  refined copper
• (B)  impure copper
• (C)  processed copper
• (D)  none of these

Answer

Submitted By :Ali Uppal

Maximum heat transfer rate can be expected in case of_________?

• (A)  Laminar flow
• (B)  Co-current flow
• (C)  Turbulent flow
• (D)  Heat flow rate is independent of nature of flow

Answer

Submitted By :Ali Uppal