Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : The viscosity of water at room temperature may be around one ___________________?

A: Centipoise B: Poise C: Stoke D: Both B. & C.

Q2 : Solutions which distil without change in composition are called________________?

A: Ideal B: Saturated C: Supersaturated D: Azeotropic

Q3 : In osmosis through a semi-permeable membrane, diffusion of the___________________?

A: Solvent is from low concentration to high concentration region B: Solvent is from high concentration to low concentration region C: Solute takes place D: None of these

Q4 : 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

Q5 : One ‘Therm’ is equivalent to___________________?

A: 105 BTU B: 105 kcal C: 109 BTU D: 109 kcal

Q6 : A perfectly insulated container of volume V is divided into two equal halves by a partition. One side is under vacuum, while the other side has one mole of an ideal gas (with constant heat capacity) at 298 K. If the partition is broken, the final temperature of the gas in the container___________________?

A: Will be greater than 298 K B: Will be 298 K C: Will be less than 298 K D: Cannot be determined

Q7 : One ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one ________________?

A: Hour B: Day C: Minute D: Second

Q8 : Assuming that CO2 obeys perfect gas law, calculate the density of CO2 (in kg/m3) at 263°C and 2 atm ?

A: 1 B: 2 C: 3 D: 4

Q9 : In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when___________________?

A: Cp < Cv B: Cp = Cv C: Cp > Cv D: C ≥ Cv

Q10 : When a gas in a vessel expands, its internal energy decreases. The process involved is________________?

A: Reversible B: Irreversible C: Isothermal D: Adiabatic

Q11 : 1 torr is equivalent to_________________?

A: 1 mm Hg B: 1 Pascal C: 1 atm D: 1 mm wc

Q12 : Which of the following is followed by an ideal solution ?

A: Boyle’s law B: Amagat’s law C: Raoult’s law D: Trouton’s rule

Q13 : The equilibria relations in a multi-component and multiphase system cannot be calculated with the help of the_______________?

A: Phase rule B: Experimental data C: Empirical equations D: Theoretical equations

Q14 : Atomic ______________ of an element is a whole number?

A: Weight B: Number C: Volume D: Radius

Q15 : The equilibrium data of component A in the two phases B and C are given below. The estimate of Y for X = 4 by fitting a quadratic expression of a form Y = mX2 for the above data is ____________________?

A: 15.5 B: 16 C: 16.5 D: 17

Q16 : At room temperature, the product [H+] [OH-] in a solution is 10-14 moles/litre. If, [OH-] = 10-6 moles/litre, then the pH of the solution will be ________________________?

A: 6 B: 8 C: 10 D: 12

Q17 : Heat capacity of air can be approximately expressed as, Cp = 26.693 + 7.365 x10-3 T, where, Cp is in J/mole.K and T is in K. The heat given off by 1 mole of air when cooled at atmospheric pressure from 500°C to – 100°C is ____________________?

A: 10.73 kJ B: 16.15 kJ C: 18.11 kJ D: 18.33 kJ

Q18 : Total energy at a point comprises of _____________ energy?

A: Potential & kinetic B: Pressure C: Internal D: All A., B. & C.

Q19 : Equal masses of CH4 and H2 are mixed in an empty container. The partial pressure of hydrogen in this container expressed as the fraction of total pressure is___________________?

A: 1/9 B: 8/9 C: 1/2 D: 5/9

Q20 : Maxwell’s relation corresponding to the identity, dH = dS = Vdp + Σμi dni is_____________________?

A: (∂T/∂V)S, ni = -(∂P/∂S)V, ni B: (∂S/∂P)T, ni = (∂V/∂T)P, ni C: (∂S/∂V)T, ni = (∂P/∂T)V, ni D: (∂T/∂P)S, ni = (∂V/∂S)P, ni

Q21 : The OH- concentration in a solution having pH value 3 is____________________?

A: 10-3 B: 10-10 C: 10-11 D: 10-13

Q22 : Which of the following is not an equation of state ?

A: Bertholet equation B: Clausius-Clapeyron equation C: Beattie-Bridgeman equation D: None of these

Q23 : 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

Q24 : The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is________________?

A: (∂T/∂V)S = – (∂P/∂S)V B: (∂S/∂P)T = – (∂V/∂T)P C: (∂V/∂S)P = (∂T/∂P)S D: (∂S/∂V)T = (∂P/∂T)V

Q25 : “The equilibrium value of the mole fraction of the gas dissolved in a liquid is directly proportional to the partial pressure of that gas above the liquid surface”. This statement pertaining to the solubility of gases in liquid is the ______________ law?

A: Raoult’s B: Henry’s C: Amagat’s D: None of these

Q26 : The depression in freezing point of a solution is________________?

A: Inversely proportional to the mass of solvent B: Directly proportional to the mole of solute C: Both A. and B. D: Neither A. nor B.

Q27 : The four properties of a system viz. P, V, T, S are related by ______________ equation?

A: Gibbs-Duhem B: Gibbs-Helmholtz C: Maxwell’s D: None of these

Q28 : 1 torr is equal to ______________ mm Hg column?

A: 1 B: 0.1 C: 10 D: 1000

Q29 : Air at a temperature of 20°C and 750 mm Hg pressure has a relative humidity of 80%. What is its percentage humidity? Vapour pressure of water at 20°C is 17.5 mm Hg?

A: 80.38 B: 80 C: 79.62 D: 78.51

Q30 : Which is not constant for an ideal gas ?

A: (∂P/∂V)T B: (∂V/∂T)P C: (∂P/∂V)V D: All (A), B. & (C)

Q31 : The thermodynamic law, PVy = constant, is not applicable in case of______________?

A: Ideal compression of air B: Free expansion of an ideal gas C: Adiabatic expansion of steam in a turbine D: Adiabatic compression of a perfect gas

Q32 : Isentropic process means a constant _____________________ process ?

A: Enthalpy B: Pressure C: Entropy D: None of these

Q33 : What is the value of maximum COP in case of absorption refrigeration, if refrigeration provided is at temperature, TR (where, T1 and T2 are source & surrounding temperatures respectively.) ?

A: TR/(T2 – TR) × (T1 – T2)/T1 B: TR/(T2 – TR) × T1/(T1 – T2) C: TR/(T1 – TR) × (T1 – T2)/T1 D: None of these

Q34 : ‘Giga’ stands for__________________?

A: 109 B: 10-12 C: 1012 D: 1015

Q35 : When pressure is applied on the system, ice ↔ water, then_________________?

A: Equilibrium cannot be established B: More ice will be formed C: More water will be formed D: Evaporation of water will take place

Q36 : 1m3 is approximately equal to_________________?

A: 28 litres B: 35 ft3 C: 4.5 litres D: 4.5 ft3

Q37 : Molar heat capacity of water in equilibrium with ice at constant pressure is_____________________?

A: 0 B: ∞ C: 1 D: None of these

Q38 : The unit of equilibrium constant of a chemical reaction is the same as that of__________________?

A: Molar concentration B: Temperature C: Internal energy D: None of these

Q39 : The chemical potential for a pure substance is ____________ its partial molal free energy?

A: More than B: Less than C: Equal to D: Not related to

Q40 : Which of the following has the smallest least effect on the solubility of a solute into the solvent ?

A: Nature of the solute B: Nature of the solvent C: Temperature D: Pressure

Q41 : For the gaseous phase reaction, N2 + O2 ⇌ 2NO, ΔH = + 80 kJ/kg. mole; the decomposition of NO is favoured by____________________?

A: Increasing the concentration of N2 B: Decrease in temperature C: Increase in pressure D: Decrease in pressure

Q42 : Which of the following decreases with increase in pressure ?

A: Melting point of ice B: Melting point of wax C: Boiling point of liquids D: None of these

Q43 : Recycling in a chemical process facilitates___________________?

A: Increased yield B: Enrichment of product C: Heat conservation D: All A., B. & C.

Q44 : The activity co-efficient of a solution, which accounts for the departure of liquid phase from ideal solution behaviour________________?

A: Measures the elevation in boiling point B: Is not dependent on the temperature C: Is a function of the liquid phase composition D: Measures the depression in freezing point

Q45 : Heat pump_______________________?

A: Accomplishes only space heating in winter B: Accomplishes only space cooling in summer C: Accomplishes both A. and B D: Works on Carnot cycle

Q46 : A solid metallic block weighing 5 kg has an initial temperature of 500°C. 40 kg of water initially at 25°C is contained in a perfectly insulated tank. The metallic block is brought into contact with water. Both of them come to equilibrium. Specific heat of block material is 0.4 kJ.kg-1. K-1. Ignoring the effect of expansion and contraction and also the heat capacity to tank, the total entropy change in kJ.kg-1, K-1 is_________________?

A: -1.87 B: 0 C: 1.26 D: 3.91

Q47 : 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?

A: 4 J B: ∞ C: 0 D: 8 J

Q48 : Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?

A: Carbonate (monohydrate) B: Chloride C: Thiosulphate D: Bisulphite

Q49 : pH value of a solution containing 1 gm of hydrogen ion per litre will be ____________________?

A: 0 B: 1 C: 7 D: 10

Q50 : The temperature at which a real gas obeys the ideal gas laws over a wide range of pressure is called the ____________ temperature?

A: Critical B: Boyle C: Inversion D: Reduced

Q51 : The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is__________________?

A: ∞ B: 1 C: 0 D: -ve

Q52 : In general, the specific heats of aqueous solutions _____________ with increase in the concentration of the solute?

A: Increase B: Decrease C: Remain unchanged D: None of these

Q53 : 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%

Q54 : Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?

A: Freezing point elevation B: Boiling point depression C: Vapor pressure lowering D: All A., B. & C.

Q55 : A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system________________?

A: its internal energy (U) decreases and its entropy (S) increases B: U and S both decreases C: U decreases but S is constant D: U is constant but S decreases

Q56 : Extensive properties of a thermodynamic system depend upon the _____________ of the system?

A: Specific volume B: Temperature C: Mass D: Pressure

Q57 : 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

Q58 : 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

Q59 : _________________ chart is a graph related to Antoine equation ?

A: Ostwald B: Cox C: Mollier’s D: Enthalpy-concentration

Q60 : Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which___________________?

A: A homogeneous solution (say of phenol water) is formed B: Mutual solubility of the two liquids shows a decreasing trend C: Two liquids are completely separated into two layers D: None of these

Q61 : The molecules of a liquid which is in equilibrium with its vapor at its boiling point on an average have equal _____________ in the two phases?

A: Potential energy B: Intermolecular forces C: Kinetic energy D: Total energy

Q62 : Number of gm moles of solute dissolved in one liter of a solution is called its____________________?

A: Equivalent weight B: Molarity C: Molality D: Normality

Q63 : 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

Q64 : In an irreversible process________________?

A: Tds = dE – dW = 0 B: dE – dW – Tds = 0 C: Tds – dE + dW < 0 D: Tds – dT + dW < 0

Q65 : _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?

A: Zeroth B: First C: Second D: Third

Q66 : Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?

A: Less than B: Same as C: More than D: Half

Q67 : Heat requirement for decomposition of a compound into its elements is _____________ that is evolved during the formation of that compound from its elements?

A: The same B: Less than C: Greater than D: Different than

Q68 : In a turbine, the fluid expands almost_________________?

A: Isothermally B: Isobarically C: Adiabatically D: None of these

Q69 : Which of the following gravity scales is used exclusively for liquids heavier than water ?

A: Baume scale B: Twaddell scale C: API scale D: None of these

Q70 : Lowering of condenser temperature (keeping the evaporator temperature constant) in case of vapour compression refrigeration system results in__________________?

A: Increased COP B: Same COP C: Decreased COP D: Increased or decreased COP; depending upon the type of refrigerant

Q71 : In a neutral solution _________________?

A: H+ ions are absent B: OH- ions are absent C: Both H+ and OH- ions are present in very small but equal concentration D: None of these

Q72 : Cp is expressed in S.I. unit as_______________?

A: J/kg.°K B: 0°K C: W/m2.°C D: W/m.°K

Q73 : What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ?

A: 2/3 B: 1/3 C: 1/2 D: 1/3 × (298/273)

Q74 : Acidity or alkanity of a solution is expressed by its pH value, which is defined as (where, [H+] = hydrogen ion concentration in the solution) ?

A: log (1/H+) B: – log (1/H+) C: 1/log H+ D: None of these

Q75 : Gases diffuse faster compared to liquids because of the reason that the liquid molecules_________________?

A: Are held together by stronger inter-molecular forces B: Move faster C: Have no definite shape D: Are heavier

Q76 : 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

Q77 : Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are_______________?

A: Always greater than one B: Same at the same reduced temperature C: Same at the same reduced pressure D: Both B. & C

Q78 : Change of state namely evaporation condensation, freezing and melting is an _______________ process?

A: Isothermal B: Adiabatic C: Isobaric D: Isochoric

Q79 : Na2SO4. 10H2O crystals are formed by cooling 100 Kg of 30% by weight aqueous solution of Na2SO4. The final concentration of the solute in the solution is 10%. The weight of crystals is________________?

A: 20 B: 32.2 C: 45.35 D: 58.65

Q80 : In a chemical process, the recycle stream is purged for______________________?

A: Increasing the product yield B: Enriching the product C: Limiting the inerts D: Heat conservation

Q81 : Translational kinetic energy of molecules of an ideal gas is proportional to (where, T = absolute temperature of the gas)__________________?

A: T B: T2 C: 1/√T D: T2

Q82 : For most salts, the solubility increases with rise in temperature, but the solubility of _______________ is nearly independent of temperature rise?

A: Sodium chloride B: Sodium carbonate monohydrate C: Anhydrous sodium sulphate D: Hypo

Q83 : A long cylinder and a sphere both of 5 cms diameter are made from the same porous material. The flat ends of cylinder are sealed. Both the cylinder and sphere are saturated with the same solution of sodium chloride. Later both the objects are immersed for a short and equal interval of time in a large tank of water which is well agitated. The fraction of salt remaining in the cylinder and the sphere are Xc and Xs respectively. Which of the following statement is correct ?

A: Xc > Xs B: Xc = Xs C: Xc < Xs D: Xc greater/less than Xs depending on the length of the cylinder

Q84 : White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?

A: Tar B: Sulphide Coke C: Coke Oven Gas D: Pulverised coke

Q85 : The chemical nature of an element is independent of_______________________?

A: Its atomic number B: The number of protons or electrons present in it C: The number of neutrons present in it D: None of these

Q86 : Entropy change of mixing two liquid substances depends upon the_________________?

A: Molar concentration B: Quantity (i.e. number of moles) C: Both A. and B D: Neither A. nor B

Q87 : “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

Q88 : A very dilute solution is prepared by dissolving ‘x1’ mole of solute in ‘x2’ mole of a solvent. The mole fraction of solute is approximately equal to_________________?

A: x1/x2 B: x2/x1 C: 1 – (x1/x2) D: 1/x2

Q89 : A liquid under pressure greater than its vapour pressure for the temperature involved is called a _____________ liquid?

A: Sub-cooled B: Saturated C: Non-solidifiable D: None of these

Q90 : Size range of the colloids particles is __________________?

A: 5 – 200 milli-microns B: 50 – 200 microns C: 500 – 1000 microns D: 10 – 50 Angstrom

Q91 : If pH value of an acidic solution is decreased from 5 to 2, then the increase in its hydrogen ion concentration is _____________ times?

A: 10 B: 100 C: 1000 D: 10000

Q92 : The ratio of existing moles of vapor per mole of vapor free gas to the moles of vapor that would be present per mole of vapor free gas, if the mixture were saturated at the existing temperature & pressure, is termed as the_____________________?

A: Relative humidity B: Relative saturation C: Percentage saturation D: None of these

Q93 : 1 Pascal (unit of pressure) is equal to _______________ N/m2 ?

A: 10 B: 1 C: 0.1 D: 1000

Q94 : In the reaction, represented by, 2SO2 + O2 ⇌ 2SO3; ΔH = – 42 kcal; the forward reaction will be favoured by____________________?

A: Low temperature B: High pressure C: Both A. and B D: Neither A. nor B

Q95 : Pick out the wrong unit conversion of mass transfer co-efficient?

A: 1 lb/hr.ft3.atm. = 4.8182 kg/hr.m2.bar B: 1 kg/hr.m2.atm= 0.98687 kg/hr. m .bar C: 1 lb/hr.ft2 = 4.8823 kg/hr.m2 D: 1 kg/hr.m2 = 4.8823 lb/hr.ft2

Q96 : Change of heat content when one mole of compound is burnt in oxygen at constant pressure is called the__________________?

A: Calorific value B: Heat of reaction C: Heat of combustion D: Heat of formation

Q97 : The temperature at which both liquid and gas phases are identical, is called the _____________ point?

A: Critical B: Triple C: Freezing D: Boiling

Q98 : A ‘limiting reactant’ is the one, which decides the ____________ in the chemical reaction?

A: Equilibrium constant B: Conversion C: Rate constant D: None of these

Q99 : Chemical potential is a/an_____________________?

A: Extensive property B: Intensive property C: Force which drives the chemical system to equilibrium D: Both B. and C

Q100 : Coal tar (produced by high temperature carbonization) is the main source of_________?

A: Aromatic compounds B: Aliphatic compounds C: Paraffins D: Olefins

Free Chemical Engineering MCQs Mock Test Online with Answers

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