MCQOPTIONS
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MCQOPTIONS
This section includes 332 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which property of refractories is the most important for top section of the blast furnace ? |
| A. | Resistance to abrasion |
| B. | Resistance to slag penetration |
| C. | Stability of volume at high temperature |
| D. | Resistance to corrosion by slag |
| Answer» B. Resistance to slag penetration | |
| 2. |
With increase in temperature, the surface tension of water _____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain constant |
| D. | Increases linearly |
| Answer» C. Remain constant | |
| 3. |
With increase in the alumina content, the refractoriness of high alumina refractories_________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 4. |
With increase in the porosity, thermal spalling resistance of fireclay brick_______________? |
| A. | Increases |
| B. | Decreases |
| C. | Remain same |
| D. | May increase or decrease |
| Answer» B. Decreases | |
| 5. |
With increase in the solute concentration, the specific heat of aqueous solutions _____________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Either A. or B.; depends on the type of solution |
| Answer» C. Remains unchanged | |
| 6. |
With increase in the temperature of pure (distilled) water, its____________________? |
| A. | pOH decreases and pH increases |
| B. | pOH and pH both decreases |
| C. | pH and pOH both increases |
| D. | pH decreases and pOH increases |
| Answer» C. pH and pOH both increases | |
| 7. |
With rise in temperature, the heat capacity of a substance___________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Either A. or B.; depends on the substance |
| Answer» B. Decreases | |
| 8. |
With rise in temperature, the solubility of ammonia in water at a fixed pressure__________________? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases exponentially |
| Answer» C. Remains unchanged | |
| 9. |
Which of the following is the Clausius-Clapeyron Equation ? |
| A. | PV = RT + B/V + y/V2 + …. |
| B. | (P + a/V2)(V-b) = RT |
| C. | loge (p/p0) = (λ/R) (1/T0 – 1/T) |
| D. | p = [RT/(V – b)] – (a/TV2) |
| Answer» D. p = [RT/(V – b)] – (a/TV2) | |
| 10. |
Which of the following holds good for a solution obeying Raoult’s law (i.e., an ideal solution) (where, ΔH = heat of mixing, and ΔV = volume change on mixing) ? |
| A. | ΔH = 1 (+ ve) and Δ V = -ve |
| B. | ΔH = 0 |
| C. | ΔV = 0 |
| D. | Both B. and C. |
| Answer» E. | |
| 11. |
Weight of 56 litres of ammonia at N.T.P. is _____________ gm? |
| A. | 2.5 |
| B. | 42.5 |
| C. | 56 |
| D. | 2800 |
| Answer» C. 56 | |
| 12. |
Water content in ground refractory material to be shaped into bricks by hand moulding is about _____________ percent? |
| A. | 5 |
| B. | 20 |
| C. | 40 |
| D. | 55 |
| Answer» C. 40 | |
| 13. |
Volume occupied by one gm mole of a gas at S.T.P. is ____________________? |
| A. | 22.4 litres |
| B. | 22400 litres |
| C. | 22.4 c.c |
| D. | 359 litres |
| Answer» B. 22400 litres | |
| 14. |
Viscosity of atmospheric air may be about _____________ centipoise? |
| A. | 0.015 |
| B. | 1.5 |
| C. | 15 |
| D. | 150 |
| Answer» B. 1.5 | |
| 15. |
Viscosity of 1 centipoise is equal to 1 Centistoke in case of________________? |
| A. | Water |
| B. | Mercury |
| C. | Carbon tetrachloride |
| D. | None of these |
| Answer» B. Mercury | |
| 16. |
Variation of vapor pressure with temperature can be calculated using Clausius-Clapeyron equation, which assumes that the________________? |
| A. | Vapor follows the ideal gas law |
| B. | Molal latent heat of vaporisation is constant within the limited temperature range |
| C. | Volume in the liquid state is negligible compared with that in the vapor state |
| D. | All A., B. & C. |
| Answer» E. | |
| 17. |
Vapor pressure of water at 100°C is about _______________ bar? |
| A. | 0.1013 |
| B. | 1.013 |
| C. | 10.13 |
| D. | 101.3 |
| Answer» C. 10.13 | |
| 18. |
Vapor pressure of a solution is proportional to (where, Sv and St are mole fraction of solvent and solute respectively) ? |
| A. | Sv |
| B. | 1/St |
| C. | St |
| D. | 1/Sv |
| Answer» B. 1/St | |
| 19. |
Validity of the relationship, inputs = outputs, holds good for the system at steady state________________? |
| A. | With chemical reaction |
| B. | Without chemical reaction |
| C. | Without chemical reaction & losses |
| D. | None of these |
| Answer» D. None of these | |
| 20. |
Unrestrained expansion of an ideal gas does not result in its cooling due to the reason that the gas molecules ____________________? |
| A. | Do not lose energy on collision |
| B. | Are above the inversion temperature |
| C. | Do not exert attractive force on each other |
| D. | Do work equal to loss in kinetic energy |
| Answer» D. Do work equal to loss in kinetic energy | |
| 21. |
Unit of mass velocity is___________________? |
| A. | kg/m.hr |
| B. | kg/m2.h |
| C. | kg/hr |
| D. | kg/m2 |
| Answer» C. kg/hr | |
| 22. |
Unit of power is____________________? |
| A. | Joule |
| B. | Watt |
| C. | Joule/Second |
| D. | Both B. & C. |
| Answer» E. | |
| 23. |
Under conditions of equal reduced pressure and equal reduced temperature, substances are said to be in the ‘corresponding states’. At equal reduced conditions i.e., at the corresponding state, the ____________ of different gases are nearly the same? |
| A. | Compressibility |
| B. | Molecular weight |
| C. | Humidity |
| D. | None of these |
| Answer» B. Molecular weight | |
| 24. |
Two solutions A1 and A2 have pH value of 2 and 6 respectively. It implies that the solution_____________________? |
| A. | A2 is more alkaline than solution A2 |
| B. | A1 is highly acidic |
| C. | A1 is very slightly acidic |
| D. | Both A. & C. |
| Answer» E. | |
| 25. |
Total energy at a point comprises of _____________ energy? |
| A. | Potential & kinetic |
| B. | Pressure |
| C. | Internal |
| D. | All A., B. & C. |
| Answer» E. | |
| 26. |
Thermal diffusivity of a refractory brick is high, when its ______________ is high? |
| A. | Density |
| B. | Specific heat |
| C. | Thermal conductivity |
| D. | None of these |
| Answer» D. None of these | |
| 27. |
Thermal conductivity of refractory bricks____________________? |
| A. | Increases with decrease in porosity |
| B. | Decreases with decreases in porosity |
| C. | Is independent of its porosity and is maximum for insulating bricks |
| D. | Increases with the amount of air entrapped in pores |
| Answer» B. Decreases with decreases in porosity | |
| 28. |
The weight fraction of methanol in an aqueous solution is 0.64. The mole fraction of methanol XM satisfies________________? |
| A. | XM < 0.5 |
| B. | XM = 0.5 |
| C. | 0.5 < XM < 0.64 |
| D. | XM ≥ 0.64 |
| Answer» E. | |
| 29. |
The viscosity of water at room temperature may be around one ___________________? |
| A. | Centipoise |
| B. | Poise |
| C. | Stoke |
| D. | Both B. & C. |
| Answer» B. Poise | |
| 30. |
The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________? |
| A. | 0.07 |
| B. | 0.09 |
| C. | 0.11 |
| D. | 0.13 |
| Answer» E. | |
| 31. |
The vapour pressure of a solution (made by dissolving a solute in a solvent) is ____________ that of the pure solvent? |
| A. | Less than |
| B. | More than |
| C. | Equal to |
| D. | Either more or less; depends on the solvent |
| Answer» B. More than | |
| 32. |
The vapor pressures of benzene and toluene are 3 and 4/3 atmospheres respectively. A liquid feed of 0.4 moles of benzene and 0.6 moles of toluene is vaporised. Assuming that the products are in equilibrium, the vapor phase mole fraction of benzene is_________________? |
| A. | 0.4 |
| B. | 0.6 |
| C. | 0.8 |
| D. | 0.2 |
| Answer» C. 0.8 | |
| 33. |
The vapor pressure of water at 100°C is__________________? |
| A. | 100 N/m2 |
| B. | 76 cms of Hg |
| C. | 13.6 cms of Hg |
| D. | 760 mm wc |
| Answer» C. 13.6 cms of Hg | |
| 34. |
The vapor pressure of the solvent decreased by 10 mm Hg, when a non-volatile solute was added to the solvent. The mole fraction of the solute in the solution is 0.2. What should be the mole fraction of the solvent, if the decrease in vapor pressure of the solvent is required to be 20 mm Hg ? |
| A. | 0.2 |
| B. | 0.1 |
| C. | 0.4 |
| D. | 0.6 |
| Answer» E. | |
| 35. |
The vapor pressure of liquids of similar chemical nature at any particular temperature _______________ with increase in the molecular weight? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Either A. or B.; depends on the liquid |
| Answer» C. Remains unchanged | |
| 36. |
The vapor pressure of liquids (having similar chemical nature) at any specified temperature ______________ with increasing molecular weight? |
| A. | Increases |
| B. | Decreases |
| C. | Remains unchanged |
| D. | Increases linearly |
| Answer» C. Remains unchanged | |
| 37. |
The vapor pressure of a substance, at its melting point, is _____________ in the solid state as compared to that in the liquid state? |
| A. | Less |
| B. | More |
| C. | Same |
| D. | Either A. or B.; depends on the nature of the substance |
| Answer» D. Either A. or B.; depends on the nature of the substance | |
| 38. |
The value of Trouton’s ratio (λb/Tb) for a number of substances is 21 (where, λb = molal that of vaporisation of a substance at its normal boiling point, KCal/kg. mole and Tb = normal boiling point, °K). The Kistyakowsky equation is used for calculation of Trouton’s ratio of _____________ liquids? |
| A. | Polar |
| B. | Non-polar |
| C. | Both A. & B. |
| D. | Neither A. nor B. |
| Answer» D. Neither A. nor B. | |
| 39. |
The value of the gas-law constant ‘R’ is 1.987 ? |
| A. | kcal/kg-mole.°C |
| B. | Btu/lb-mole.°R |
| C. | kcal/kg-mole.°K |
| D. | Both B. & C. |
| Answer» E. | |
| 40. |
The value of gas constant ‘R’ is ______________ kcal/kg.mole.°C? |
| A. | 2.79 |
| B. | 1.987 |
| C. | 3.99 |
| D. | None of these |
| Answer» E. | |
| 41. |
The value of (Cp – Cv) for a real gas obeying Vander Wall’s equation is____________________? |
| A. | R |
| B. | > R |
| C. | < R |
| D. | 0.5 R |
| Answer» C. < R | |
| 42. |
The unit of specific heat at constant pressure, Cp, in SI unit is__________________? |
| A. | W/m2°C |
| B. | J/kg°K |
| C. | W/m°K |
| D. | J/m3°K |
| Answer» C. W/m°K | |
| 43. |
The unit of dynamic viscosity is_________________? |
| A. | Stoke |
| B. | Poise |
| C. | gm/cm sec |
| D. | Both B. & C. |
| Answer» E. | |
| 44. |
The unit of Cp in S.I. units is___________________? |
| A. | W/m2.°K |
| B. | J/kg.°K |
| C. | W/m.°K |
| D. | J/m3. °K |
| Answer» C. W/m.°K | |
| 45. |
“The total volume occupied by a gaseous mixture is equal to the sum of the pure component volumes”. This is the _____________ law? |
| A. | Dalton’s |
| B. | Amagat’s |
| C. | Gay-Lussac’s |
| D. | Avogadro’s |
| Answer» C. Gay-Lussac’s | |
| 46. |
The total number of atoms in 8.5 gm of NH3 is _______________ × 1023? |
| A. | 9.03 |
| B. | 3.01 |
| C. | 1.204 |
| D. | 6.02 |
| Answer» B. 3.01 | |
| 47. |
The temperature of a gas in a closed container is 27° C. If the temperature of the gas is increased to 300° C, then the pressure exerted is___________________? |
| A. | Doubled |
| B. | Halved |
| C. | Trebled |
| D. | Unpredictable |
| Answer» E. | |
| 48. |
The temperature at which the second Virial co-efficient of a real gas is zero is called the_____________________? |
| A. | Eutectic point |
| B. | Boyle temperature |
| C. | Boiling point |
| D. | Critical temperature |
| Answer» B. Boyle temperature | |
| 49. |
The temperature at which a real gas obeys Boyle’s law is termed as the__________________? |
| A. | Triple point |
| B. | Boyle’s temperature |
| C. | Eutectic point |
| D. | Inversion temperature |
| Answer» C. Eutectic point | |
| 50. |
The reverse process of fractional crystallisation is called__________________? |
| A. | Stripping |
| B. | Leaching |
| C. | Differential distillation |
| D. | Absorption |
| Answer» C. Differential distillation | |