Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : “The heat capacity of a solid compound is approximately equal to the sum of the heat capacities of the constituent elements.” This is the statement of___________________?

A: Law of Petit and Dulong B: Kopp’s rule C: Nernst heat theorem D: Trouton’s rule

Q2 : 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

Q3 : When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is___________________?

A: Same in both the phases B: Zero in both the phases C: More in vapour phase D: More in liquid phase

Q4 : 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

Q5 : Normality of a solution does not change with the increase in the __________________?

A: Pressure B: Temperature C: Solute concentration D: Dilution of the solution

Q6 : 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

Q7 : 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)

Q8 : A rigid vessel containing three moles of nitrogen gas at 30°C is heated to 250°C. Assume the average capacities of nitrogen to be Cp = 29.1 J/mole.°C and, Cv = 20.8 J/mole.°C. The heat required, neglecting the heat capacity of the vessel, is__________________?

A: 13728 J B: 19206 J C: 4576 J D: 12712 J

Q9 : According to Raoult’s law, “The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component.” Raoult’s law is not applicable under the following assumption/condition?

A: No component is concentrated at the surface of the solution B: The component molecules are non polar and are of almost equal size C: In the formation of solution, chemical combination/molecular association between unlike D: The attractive forces between like and unlike molecules are almost equal

Q10 : 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

Q11 : 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

Q12 : 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

Q13 : “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

Q14 : The most blister form of copper is__________?

A: impure copper B: processed copper C: none of these D: refined copper

Q15 : An aqueous solution of 2.45% by weight H2SO4 has a specific gravity of 1.011. The composition expressed in normality is______________?

A: 0.2500 B: 0.2528 C: 0.5000 D: 0.5055

Q16 : 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

Q17 : A source rock that is too immature to generate petroleum in its natural setting is known as__________?

A: Effective Source Rock B: Potential Source Rock C: Unconventional Source Rock D: All of above

Q18 : The quantity of heat required to evaporate 1 kg of a saturated liquid is called __________________?

A: Specific heat B: 1 Kcal C: Sensible heat D: Latent heat

Q19 : Which of the following has the minimum value of COP for a given refrigeration effect ?

A: Reverse Carnot cycle B: Ordinary vapour-compression cycle C: Vapour-compression process with a reversible expansion engine D: Air refrigeration cycle

Q20 : 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.

Q21 : 1 torr is equal to ______________ mm Hg column?

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

Q22 : Heat of solution in a system in which both solute and solvent are liquids is termed as_________________?

A: Heat of solvation B: Heat of hydration C: Standard integral heat of solution D: Heat of mixing

Q23 : Atmospheric pressure corresponds to a hydrostatic head of_________________?

A: 13.6 cms of Hg B: 34 ft ofH2O C: 1 metre of H2O D: 13.6 metres of Hg

Q24 : 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

Q25 : 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

Q26 : 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

Q27 : 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

Q28 : 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

Q29 : The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 – T2)/T1. The co-efficient of performance (C.O.P.) of a Carnot heat pu

A: T1/(T1-T2 B: T2/(T1-T2) C: T1/T2 D: T2/R1

Q30 : 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

Q31 : What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope ?

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

Q32 : 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)

Q33 : The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is_________________?

A: R loge 4 B: R log10 4 C: Cv log10 4 D: Cv loge 4

Q34 : 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

Q35 : Which of the following is not a unit of kinematic viscosity ?

A: Poise B: Stoke C: cm2/second D: None of these

Q36 : 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

Q37 : At a constant volume, for a fixed number of moles of a gas, the pressure of the gas increases with rise of temperature due to___________________?

A: Decrease in mean free path B: Increased collision rate among molecules C: Increase in molecular attraction D: Increase in average molecular speed

Q38 : Unit of mass velocity is___________________?

A: kg/m.hr B: kg/m2.hr C: kg/hr D: kg/m2

Q39 : Work done is a____________________?

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

Q40 : A gaseous mixture contains 14 kg of N2, 16 kg of O2 and 17 kg of NH3. The mole fraction of oxygen is__________________?

A: 0.16 B: 0.33 C: 0.66 D: 0.47

Q41 : 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

Q42 : Grams of butane (C4H10) formed by the liquefaction of 448 litres of the gas (measured at (STP) would be__________________?

A: 580 B: 640 C: 1160 D: Data insufficient; can’t be computed

Q43 : Specific/molar Gibbs free energy for a pure substance does not change during________________?

A: Sublimation B: Vaporisation C: Melting D: Either A, B. or C.

Q44 : A gas at 0°C was subjected to constant pressure cooling until its volume became half the original volume. The temperature of the gas at this stage will be________________?

A: 0°C B: 0°K C: 136.5°C D: -136.5°K

Q45 : 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

Q46 : Free energy change at equilibrium is____________________?

A: Zero B: Positive C: Negative D: Indeterminate

Q47 : 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

Q48 : 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

Q49 : 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

Q50 : A system is said to be isopiestic, if there is no ______________ change?

A: Temperature B: Pressure C: Volume D: None of these

Q51 : 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%

Q52 : 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

Q53 : Internal energy is independent of the ____________ for an ideal gas?

A: Pressure B: Volume C: Both A. & B. D: Neither A. nor B.

Q54 : What is the value of ln y (where y = activity co-efficient) for ideal gases ?

A: Zero B: Unity C: Infinity D: Negative

Q55 : 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

Q56 : Free energy, fugacity and activity co-efficient are all affected by change in the temperature. The fugacity co-efficient of a gas at constant pressure ______________ with the increase of reduced temperature?

A: Decreases B: Increases C: Remains constant D: Decreases logarithmically

Q57 : The internal energy of a gas obeying P (V – b) RT (where, b is a positive constant and has a constant Cv), depends upon its________________?

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

Q58 : 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

Q59 : 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

Q60 : 1 torr is equal to ______________ mm Hg column?

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

Q61 : Claude gas liquefaction process employs cooling___________________?

A: At constant pressure B: By throttling C: By expansion in an engine D: None of these

Q62 : 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

Q63 : 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

Q64 : 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

Q65 : 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

Q66 : _____________ law of thermodynamics ascertains the direction of a particular spontaneous process?

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

Q67 : 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

Q68 : 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

Q69 : _______________ functions are exemplified by heat and work ?

A: Path B: Point C: State D: None of these

Q70 : 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

Q71 : For an ideal gas, the chemical potential is given by______________?

A: RT d ln P B: R d ln P C: R d ln f D: None of these

Q72 : 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

Q73 : ______________ equation gives the effect of temperature on heat of reaction ?

A: Kirchoff’s B: Maxwell’s C: Antoine D: Kistyakowsky

Q74 : The combustion equations of carbon and carbon monoxide are as follows: C + O2 = CO2, ΔH = – 394 kJ/kg .mole CO + ½ O2 = CO2, ΔH = – 284.5 kJ/kg. mole. The heat of formation of CO is _____________ kJ/kg. mole?

A: -109.5 B: +109.5 C: +180 D: +100

Q75 : 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

Q76 : The melting point of paraffin wax (which contracts on solidification) _______________ with pressure rise?

A: Increases B: Decreases C: Remains unchanged D: Decreases linearly

Q77 : The temperature at which both liquid and gas phases are identical, is called the _____________ point?

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

Q78 : The heat capacity of a substance is ____________________?

A: Greater for liquid state than for solid state B: Lower for liquid state than for gaseous state C: Higher for solid state than for liquid state D: Equal for solid and liquid states below melting point

Q79 : pH value of H2SO4 (5% concentration) is__________________?

A: 5 B: 7 C: > 7 D: < 7

Q80 : 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

Q81 : In _______________ process, ions of salts react with water to produce acidity or alkalinity ?

A: Hydration B: Hydrolysis C: Electrolysis D: Dialysis

Q82 : 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

Q83 : The accumulation in a steady state combustion process, burning 1 kg mole of carbon with 1 kg mole of oxygen thereby producing 1 kg mole of carbon dioxide, is _____________ kg mole?

A: 1 B: 0 C: 16 D: 24

Q84 : The heat capacity of most substances is greater for the _______________ state?

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

Q85 : 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

Q86 : 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

Q87 : 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

Q88 : 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

Q89 : Refrigeration capacity of a household refrigerator may be round about _____________ tons?

A: 0.15 B: 1.5 C: 4.5 D: 6.5

Q90 : 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

Q91 : 1 Pascal (unit of pressure) is equal to _______________ N/m2 ?

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

Q92 : Near their critical temperatures, all gases occupy volumes _____________ that of the ideal gas?

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

Q93 : 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

Q94 : COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about____________________?

A: 0.5 B: 3.5 C: 4.5 D: 8.5

Q95 : Clausius-Clapeyron Equation gives accurate result, when the __________________?

A: Vapour pressure is relatively low and the temperature does not vary over wide limits B: Vapour obeys the ideal gas law and the latent heat of vaporisation is constant C: Volume in the liquid state is negligible compared with that in the vapour state D: All A, B. and C

Q96 : 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

Q97 : For a single component two phase mixture, the number of independent variable properties are_________________?

A: Two B: One C: Zero D: Three

Q98 : 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

Q99 : 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

Q100 : 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

Free Chemical Engineering MCQs Mock Test Online with Answers

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