Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?

A: dE = Tds – PdV B: dQ = CvdT + PdV C: dQ = CpdT + Vdp D: Tds = dE – PdV

Q3 : How much O2 can be obtained from 90 kg of water ?

A: 32 kg B: 80 kg C: 64 kg D: 90 kg

Q4 : 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

Q5 : 1 Pascal (unit of pressure) is equal to _______________ N/m2 ?

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

Q6 : Which of the following is not a colligative property ?

A: Osmotic pressure B: Depression of freezing point C: Lowering of vapor pressure D: None of these

Q7 : The activity of an ideal gas is numerically ____________ its pressure?

A: More than B: Less than C: Equal to D: Data insufficient, can’t be predicted

Q8 : Any substance above its critical temperature exists as _____________________?

A: Saturated vapour B: Solid C: Gas D: Liquid

Q9 : 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

Q10 : The difference between isothermal compressibility and adiabatic compressibility for an ideal gas is____________________?

A: 0 B: +ve C: -ve D: ∞

Q11 : Enthalpy of formation of NH3 is – 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH3 → N2 + 3H2, is equal to _____________ kJ/kg. mole?

A: 46 B: 92 C: -23 D: -92

Q12 : For a constant pressure reversible process, the enthalpy change (ΔH) of the system is___________________?

A: Cv.dT B: Cp.dT C: ∫ Cp.dT D: ∫ Cv.dT

Q13 : In the reaction, H2 +I2 ⇌ 2HI, addition of an inert gas will___________________?

A: Increase the partial pressure of H2 B: Increase the partial pressure of I2 C: Increase the total pressure and hence shift the equilibrium towards the right D: Not affect the equilibrium conditions

Q14 : Heat of transition is the heat evolved or absorbed, when a substance is converted from_________________?

A: Vapor to liquid B: Vapor to solid C: Solid to liquid D: One allotropic form to another allotropic form

Q15 : _____________ fuels require the maximum percentage of ‘excess air’ for complete combustion ?

A: Solid B: Liquid C: Gaseous D: Nuclear

Q16 : 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

Q17 : During the phase transition, _______________ changes?

A: Pressure B: Volume C: Temperature D: All A , B. and C

Q18 : The density of a gas ‘X’ is twice that of another gas ‘Y’. If the molecular weight of gas ‘Y’ is ‘M’; then the molecular weight of the gas ‘X’ will be________________?

A: 2M B: M/2 C: M D: M/4

Q19 : When a gas in a vessel expands, its internal energy decreases. The process involved is________________?

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

Q20 : A chemical process is said to occur under unsteady state, if the_________________?

A: Inventory changes do not take place B: Ratio of streams entering/leaving are independent of time C: Flow rates & composition both are time dependent D: None of these

Q21 : Saturated solution of benzene in water is in equilibrium with a mixture of air and vapours of benzene and water at room temperature and pressure. Mole fraction of benzene in liquid is xB and the vapour pressures of benzene and water at these conditions are pv B and pv w respectively. The partial pressure of benzene in air-vapour mixture is_________________?

A: PvB B: xB.PvB C: (Patm – Pvw)xB D: xB.Patm

Q22 : Kinetic theory of gases stipulates that, the____________________?

A: Energy is lost during molecular collisions B: Molecules possess appreciable volume C: Absolute temperature is a measure of the kinetic energy of molecules D: None of these

Q23 : 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

Q24 : “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

Q25 : Work done is a____________________?

A: Property of the system B: Path function C: Point function D: State description of a system

Q26 : 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

Q27 : 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

Q28 : Co-efficient of Performance (COP) of a refrigerator is the ratio of the ______________________?

A: Work required to refrigeration obtained B: Refrigeration obtained to the work required C: Lower to higher temperature D: Higher to lower temperature

Q29 : With increase in temperature, the surface tension of water _____________________?

A: Increases B: Decreases C: Remain constant D: Increases linearly

Q30 : Cp is expressed in S.I. unit as_______________?

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

Q31 : No cooling occurs, when an ideal gas undergoes unrestrained expansion, because the molecules____________________?

A: Collide without loss of energy B: Do work equal to loss in kinetic energy C: Are above the inversion temperature D: Exert no attractive force on each other

Q32 : In which of the following case of mixing of a strong acid with strong base (each of 1N concentration), temperature increase will be the highest ?

A: 30 c.c acid and 30 c.c base B: 20 c.c acid and 25 c.c base C: 15 c.c acid and 35 c.c base D: 35 c.c acid and 15 c.c base

Q33 : _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?

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

Q34 : 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

Q35 : Entropy is a/an___________________?

A: State function B: Macroscopic property C: Extensive property D: None of these

Q36 : The pH value of a solution is 5.9. If the hydrogen ion concentration is decreased hundred times, the solution will be______________?

A: Basic B: More acidic C: Neutral D: Of the same acidity

Q37 : Gibbs-Duhem equation_____________________?

A: States that n1dμ1 + n2dμ2 + ….njdμj = 0, for a system of definite composition at constant temperature and pressure B: Applies only to binary systems C: Finds no application in gas-liquid equilibria involved in distillation D: None of these

Q38 : If 1 Nm3 of O2 contains ‘N’ number of molecules, then number of molecules in 2Nm3 of SO2 will be_________________?

A: N B: N/2 C: 2N D: 4N

Q39 : 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

Q40 : 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

Q41 : 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

Q42 : Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is ___________________?

A: T2/(T1 – T2) B: T1/(T1 – T2) C: (T1 – T2)/T1 D: (T1 – T2)/T2

Q43 : 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%

Q44 : 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?

A: 4 J B: ∞ C: 0 D: 8 J

Q45 : Entropy of the system decreases, when_______________?

A: Snow melts into water B: A gas expands spontaneously from high pressure to low pressure C: Water is converted into ice D: Both B. & C

Q46 : All gases above its inversion temperature, in a throttling process will show__________________?

A: A heating effect B: No change in temperature C: A cooling effect D: Either A. or (C)

Q47 : A gas mixture contains 6 moles of H2 and 2 moles of N2. If the total pressure of the gaseous mixture is 4 kgf/cm2; then the partial pressure of N2 in the mixture will be _____________ kgf/cm2 ?

A: 1 B: 2 C: 4 D: 8

Q48 : 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

Q49 : Density of carbon dioxide is _________________ kg/Nm3 ?

A: 44/22400 B: 44/22.4 C: 22.4/44 D: None of these

Q50 : Percentage saturation of a vapor bearing gas is always _____________ the relative saturation?

A: Higher than B: Smaller than C: Equal to D: Either A. or B.; depends on the system

Q51 : 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

Q52 : Heat of neutralisation of HCl and NaOH is – 57.46 kJ/Kg mole. The heat of ionisation of water will be _____________ kJ/Kg mole?

A: 57.46 B: -57.46 C: 114.92 D: -28.73

Q53 : The heat of solution depends upon the____________________?

A: Nature of solvent B: Concentration of solution C: Nature of solute D: All A., B. & C.

Q54 : 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

Q55 : Which of the following is not correct for a reversible adiabatic process ?

A: TVγ-1 = constant B: p1-γ.TY = constant C: PVγ = constant D: None of these

Q56 : The heat capacity of most substances is greater for the _______________ state?

A: Solid B: Liquid C: Gaseous D: None of these

Q57 : The first law of thermodynamics is a restatement of the law of conservation of_________________?

A: Mass B: Energy C: Momentum D: None of these

Q58 : “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

Q59 : Domestic refrigerator usually works on the _____________ refrigeration cycle?

A: Carnot B: Air C: Absorption D: vapour-ejection

Q60 : 1 Kcal/kg. °C is equivalent to _______________ BTU/lb. °F ?

A: 1 B: 2.42 C: 4.97 D: None of these

Q61 : According to the kinetic theory, the thermal conductivity of a monatomic gas is proportional to___________________?

A: T B: T0.5 C: T1.5 D: T2

Q62 : 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)

Q63 : 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

Q64 : One ‘Therm’ is equivalent to___________________?

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

Q65 : Equation which relates pressure, volume and temperature of a gas is called the__________________?

A: Equation of state B: Gibbs Duhem equation C: Ideal gas equation D: None of these

Q66 : On mixing 56 gm of CaO with 63 gm of HNO3, the amount of Ca(NO3)2 formed is ______________ gm?

A: 82 B: 164 C: 41 D: 8.2

Q67 : The forces causing the vaporisation of liquid are derived from the Kinetic energy of translation of its molecules. The heat of vaporisation_________________?

A: Increases with pressure rise B: Decreases with increasing pressure C: Becomes zero at the critical point D: Both B. & C.

Q68 : Heat of reaction is not influenced by__________________?

A: The route/method through which final products are obtained B: The physical state (e.g., solid, liquid or gaseous) of reactants and products C: Whether the reaction is carried out at constant temperature or constant pressure D: None of these

Q69 : 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

Q70 : 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

Q71 : 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

Q72 : If the pressure of a gas is reduced to half & its absolute temperature is doubled, then the volume of the gas will_________________?

A: Be reduced to 1/4th B: Increase four times C: Increase two times D: None of these

Q73 : In a mixture of benzene vapor and nitrogen gas at a total pressure of 900 mm Hg, if the absolute humidity of benzene is 0.2 kg benzene/kg nitrogen, the partial pressure of benzene in mm Hg is__________________?

A: 180 B: 60.3 C: 720 D: 200

Q74 : 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

Q75 : Solutions which distil without change in composition are called________________?

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

Q76 : 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

Q77 : At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be________________?

A: More B: Less C: Same D: More or less; depending on the system

Q78 : 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

Q79 : ________________ decreases during adiabatic throttling of a perfect gas?

A: Entropy B: Temperature C: Enthalpy D: Pressure

Q80 : The equation Tds = dE – PdV applies to___________________?

A: Single phase fluid of varying composition B: Single phase fluid of constant composition C: Open as well as closed systems D: Both B. and C

Q81 : What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor ?

A: 2 B: 0 C: 3 D: 1

Q82 : A fluid gas produced on burning furnace oil contains 0.15 gm mole of CO2, 0.05 gm mole of oxygen and 0.80 gm mole of N2. What is its molecular weight ?

A: 28.6 B: 30.0 C: 30.6 D: 32.6

Q83 : Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?

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

Q84 : Average molecular weight of air is about ____________________?

A: 21 B: 29 C: 23 D: 79

Q85 : 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

Q86 : 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

Q87 : What is the simplest formula of a compound containing 50% of element A (atomic weight = 10) and 50% of element B (atomic weight = 20) ?

A: AB3 B: A2B3 C: A2B D: AB2

Q88 : 500 c.c. each of hydrogen at 700 mm Hg pressure and oxygen at 600 mm Hg pressure are put together in a vessel of 1 litre capacity. The final pressure of the gas mixture will be _____________ mm Hg?

A: 650 B: 700 C: 600 D: 375

Q89 : 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

Q90 : Extensive properties of a thermodynamic system depend upon the _____________ of the system?

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

Q91 : Which of the following terms of Vander Walls equation of state for a non-ideal gas accounts for intermolecular forces ?

A: RT B: P + (a/V2) C: (V – b) D: 1/RT

Q92 : 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

Q93 : 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

Q94 : The value of gas constant ‘R’ is__________________?

A: 1.987 cal/gm mole °K B: 1.987 BTU/lb. mole °R C: Both A. and B D: Neither A. nor B

Q95 : In a binary liquid system, the composition expressed as _______________ is independent of the temperature & pressure?

A: Kg of solute/kg of solvent B: Kg-mole of solute/kg-mole of solvent C: Kg-mole of solute/1000 kg of solvent D: All A., B. & C.

Q96 : Vapor pressure of water at 100°C is about _______________ bar?

A: 0.1013 B: 1.013 C: 10.13 D: 101.3

Q97 : The work done in an adiabatic change in a particular gas depends upon changes in the ______________ only?

A: Temperature B: Specific heat C: Volume D: Pressure

Q98 : The percentage ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the existing temperature is_____________________?

A: Termed as relative saturation B: Not a function of the composition of gas mixture C: Called percentage saturation D: Not a function of the nature of vapor

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 : Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________?

A: Same B: Doubled C: Halved D: One fourth of its original value

Free Chemical Engineering MCQs Mock Test Online with Answers

Time to prove what you know!

LAT Test

GAT Test

Contact Info

Free Chemical Engineering MCQs Mock Test Online with Answers

Subscribe our Newsletter

LAT Test

GAT Test

Contact Info