Free Chemical Engineering MCQs Mock Test Online with Answers

Q1 : 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

Q2 : 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

Q3 : 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

Q4 : Change of state namely evaporation condensation, freezing and melting is an _______________ process?

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

Q5 : The heat capacity of most substances is greater for the _______________ state?

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

Q6 : For a single component two phase mixture, the number of independent variable properties are_________________?

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

Q7 : 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

Q8 : Work done is a____________________?

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

Q9 : 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

Q10 : 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

Q11 : 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)

Q12 : 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

Q13 : 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

Q14 : Any substance above its critical temperature exists as _____________________?

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

Q15 : Read More Details about this Mcq: 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

Q16 : Which of the following gases will have the- highest kinetic energy per mole at the same pressure & temperature ?

A: Chlorine B: Nitrogen C: Ethane D: All the gases will have the same KE

Q17 : 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

Q18 : Coal tar (produced by high temperature carbonization) is the main source of_________?

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

Q19 : Average molecular weight of air is about ____________________?

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

Q20 : 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

Q21 : In an isothermal process on an ideal gas, the pressure increases by 0.5 percent. The volume decreases by about _____________ percent?

A: 0.25 B: 0.5 C: 0.75 D: 1

Q22 : ‘Giga’ stands for__________________?

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

Q23 : 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

Q24 : 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

Q25 : Which of the following is not a unit of kinematic viscosity ?

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

Q26 : 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

Q27 : 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

Q28 : 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

Q29 : Recycling in a chemical process facilitates___________________?

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

Q30 : N.T.P. corresponds to__________________?

A: 1 atm absolute pressure & 0°C B: 760 mm Hg gauge pressure & 0°C C: 760 torr & 15°C D: 101.325 KPa gauge pressure & 0°C

Q31 : Free energy change at equilibrium is____________________?

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

Q32 : Unit of mass velocity is___________________?

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

Q33 : 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

Q34 : An ideal gas can be liquefied, because ___________________?

A: Its molecular size is very small B: Its critical temperature is more than 0°C C: Forces operative between its molecules are negligible D: It gets solidified directly without becoming liquid

Q35 : 4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?

A: 4 J B: ∞ C: 0 D: 8 J

Q36 : 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

Q37 : 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

Q38 : 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

Q39 : Which is not a refrigerant ?

A: SO2 B: NH3 C: CCl2F2 D: C2H4Cl2

Q40 : 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

Q41 : 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

Q42 : 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)

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 : 1 kg of calcium carbide (CaC2) produces about 0.41 kg of acetylene gas on treatment with water. How many hours of service can be derived from 1 kg of calcium carbide in an acetylene lamp burning 35 litres of gas at NTP per hour ?

A: 5 B: 10 C: 15 D: 20

Q45 : 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

Q46 : Gases having same reduced temperatures and reduced pressures_________________?

A: Deviate from ideal gas behaviour to the same degree B: Have nearly the same compressibility factor C: Both A. and B. D: Neither A. nor B.

Q47 : A system is said to be isopiestic, if there is no ______________ change?

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

Q48 : 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

Q49 : 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

Q50 : During the phase transition, _______________ changes?

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

Q51 : For an ideal solution, the value of activity co-efficient is______________________?

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

Q52 : 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

Q53 : 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

Q54 : Tea kept in a thermos flask is vigorously shaken. If the tea is considered as a system, then its temperature will_________________?

A: Increase B: Decrease C: Remain unchanged D: First fall and then rise

Q55 : 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

Q56 : 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

Q57 : When a gas in a vessel expands, its internal energy decreases. The process involved is________________?

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

Q58 : Which of the following rock favors petroleum formation?

A: Sedimentary rock B: Igneous rock C: Metamorphic rock D: None of these

Q59 : 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

Q60 : 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

Q61 : Sodium ______________ has inverted solubility curve i.e. its solubility increases with the lowering of temperature?

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

Q62 : Baffles are provided in heat exchangers to____________?

A: Remove dirt B: Increase heat transfer rate C: Reduce vibrations D: Reduce heat transfer rate

Q63 : Throttling (Joule-Thomson effect) process is a constant _____________ process?

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

Q64 : 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

Q65 : Refrigeration capacity of a household refrigerator may be round about _____________ tons?

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

Q66 : 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

Q67 : 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

Q68 : Atomic ______________ of an element is a whole number?

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

Q69 : 1m3 is approximately equal to_________________?

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

Q70 : 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.

Q71 : 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.

Q72 : 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

Q73 : 1 torr is equal to ______________ mm Hg column?

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

Q74 : 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

Q75 : The heat of solution depends upon the____________________?

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

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 : Isentropic process means a constant _____________________ process ?

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

Q78 : 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

Q79 : At a temperature of 0°K, the molecules of a gas have only _______________ energy?

A: Rotational B: Vibrational C: Translational D: None of these

Q80 : Enthalpy ‘H’ is defined as___________________?

A: H = E – PV B: H = F – TS C: H – E = PV D: None of these

Q81 : 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

Q82 : 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

Q83 : 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

Q84 : Isotopes are atoms having the same _____________________?

A: Mass number B: Number of neutrons C: Atomic mass D: None of these

Q85 : The first law of thermodynamics is a restatement of the law of conservation of_________________?

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

Q86 : 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

Q87 : ________________ decreases during adiabatic throttling of a perfect gas?

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

Q88 : 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

Q89 : 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

Q90 : “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

Q91 : 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

Q92 : A car tyre of volume 0.057 m3 is inflated to 300 kPa at 300 K. After the car is driven for 10 hours, the pressure in the tyre increases to 330 kPa. Assume air is an ideal gas and Cv for air is 21 J/mole.K. The change in the internal energy of air in the tyre in J/mole is__________________?

A: 380 B: 630 C: 760 D: 880

Q93 : 1 gm mole of methane (CH4) contains_________________?

A: 6.02 × 1023 atoms of hydrogen B: 4 gm atoms of hydrogen C: 3.01 × 1023 molecules of methane D: 3 gms of carbon

Q94 : 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

Q95 : On opening the door of an operating refrigerator kept in a closed room, the temperature of the room will____________________?

A: Increase B: Decrease C: Remain same D: Increase in summer and will decrease in winter

Q96 : 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

Q97 : Pick out the correct statement?

A: If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, B: A process is irreversible as long as Δ S for the system is greater than zero C: The mechanical work done by a system is always equal to∫P.dV D: The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

Q98 : 1 torr is equivalent to_________________?

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

Q99 : The temperature at which both liquid and gas phases are identical, is called the _____________ point?

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

Q100 : 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

Free Chemical Engineering MCQs Mock Test Online with Answers

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