chemical engineering Mcqs
8001. Maximum permissible residual chlorine in treated water should be ____________ mg/litre?
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A. 2 to 3

B. 5 to 10

C. 0.2 to 0.3

D. 0.001 to 0.01

8002. Ringelmann chart is used for the evaluation of _____________ pollution?
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A. Air

B. Radioactive

C. Noise

D. Water

8003. Shouting by a man at his full voice corresponds to a voice level of about _____________ decibels?
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A. 25

B. 80

C. 50

D. 120

8004. Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes_________________?
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A. All A., B. and C.

B. Nervous depression

C. Gastritis and diarrhea

D. Paralysis of muscles & loss of appetite

8005. Ozone is__________________?
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A. A primary pollutant

B. A secondary pollutant

C. Impervious to ultra-violet rays

D. Both B. and C.
8006. Exposure to chemicals having carcinogenic properties cause___________________?
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A. Asphyxiation

B. Dermatitis (skin disorder)

C. Cancer

D. Asthma

8007. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause___________________?
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A. Explosion

B. Non biodegradable foam

C. Corrosion

D. Undesirable plant growth

8008. A thermodynamic system is taken from state A to B along ACB and is brought back to A along BDA as shown below in the P-V diagram. The net work done during the complete cycle is given by the area covered by_________________?
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A. ACBB1A1A

B. ADBB1A1A

C. P1ACBP2P1

D. ACBDA
8009. Black smoke coming out of the chimney of a furnace is an indication of the use of ______________ in the furnace?
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A. Low amount of excess combustion air

B. Large quantity of excess combustion air

C. Hydrocarbon fuel

D. Pulverised coal as fuel

8010. ____________ is removed from water by lime-soda process?
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A. Permanent hardness

B. Foul smell and taste

C. Iron and manganese

D. Temporary hardness
8011. Troutons ratio of ______________ liquids is calculated using Kistyakowsky equation?
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A. Polar

B. Non-polar

C. Both A. & B

D. Neither A. nor B

8012. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds ______________ percent (by volume)?
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A. 3

B. 1

C. 7

D. 20
8013. Pollution by particulate matter emission in the atmosphere does not take place during metal____________________?
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A. Polishing

B. Grinding

C. Machining

D. Cutting

8014. Which of the following is a green house gas other than CO2 ?
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A. All A., B. and C.

B. Chlorofluoro carbons (CFC)

C. Methane

D. Nitrous oxide

8015. Which of the following pollutants, if present in atmosphere is detectable by its odour ?
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A. SO2

B. CO

C. NO2

D. CO2

8016. Which of the following industries discharge mercury as a pollutant ?
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A. Chloro-alkali industry

B. Phosphoric acid plant

C. Beverage plant

D. Tanneries

8017. Brown spots in fabrics will be caused by washing with water containing large amount of___________________?
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A. Iodine

B. Bromine

C. Iron

D. Zinc

8018. Pick out the wrong statement pertaining to green house for the plants ?
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A. e ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants

B. the glass of the green house

C. Green house (made of glass) allows visible sunlight (i.e., short wavelength solar radiation

D. ide it

E. acts like the glass of green house thereby warming up the earths surface

F. Green house effect in earths atmosphere is due to increasing CO2 level in atmosphere, where

8019. Which of the following is not a secondary air pollutant ?
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A. Sulphur dioxide

B. Photochemical smog

C. All A., B. & C.

D. Ozone

8020. Which is an example of closed system ?
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A. Air compressor

B. Liquid cooling system of an automobile

C. Boiler

D. None of these

8021. The third law of thermodynamics states that the__________________?
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A. Gases having same reduced properties behaves similarly

B. Heat capacity of a crystalline solid is zero at absolute zero temperature

C. None of these

D. Heat transfer from low temperature to high temperature source is not possible without external

E. k

8022. In the equation, PVn = constant, if the value of n is in between 1 and y (i.e. Cp/Cv), then it represents a reversible ____________ process?
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A. Isentropic

B. Isometric

C. Polytropic

D. Isobaric

8023. Which of the following is true for Virial equation of state ?
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A. For some gases, Virial equations and ideal gas equations are the same

B. Virial co-efficients are universal constants

C. Virial co-efficients are function of temperature only

D. Virial co-efficients B represents three body interactions

8024. For an incompressible fluid, the _______________ is a function of both pressure as well as temperature?
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A. Entropy

B. All (A), B. & (C)

C. Internal energy

D. Enthalpy
8025. The internal energy of an ideal gas is a function of its _____________ only?
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A. Temperature

B. Pressure

C. Volume

D. Molecular size

8026. At normal boiling point, molar entropy of vaporisation is _____________ Joule/K.mole?
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A. 192

B. 72

C. 92

D. 142

8027. For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the _______________ of each component must be same in all phases?
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A. Chemical potential

B. Fugacity

C. Both A. and B

D. Neither A. nor B

8028. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is 57C and 5.2 atm) ?
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A. Pressure and temperature must be kept below 5.2 atm. and 57C respectively

B. Temperature must be kept above 57C

C. Pressure must be kept below 5.2 atm

D. Pressure must be kept below 5.2 atm. and temperature must be kept above 57C

8029. Standard temperature and pressure (S.T.P.) is__________________?
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A. 0C and 1 kgf/cm2

B. 15C and 1 kgf/cm2

C. 0C and 750 mm Hg

D. 15C and 750 mm Hg

8030. For a spontaneous process, free energy__________________?
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A. Is zero

B. Increases

C. Decreases whereas the entropy increases

D. And entropy both decrease

8031. The expression for entropy change given by, ?S = nR ln (V2/V1) + nCv ln (T2/T1) is valid for ______________________?
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A. Simultaneous heating and expansion of an ideal gas

B. Heating of a substance

C. Cooling of a substance

D. Reversible isothermal volume change

8032. The intensive properties are_____________?
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A. Molar volume, density, viscosity and boiling point

B. Refractive index and surface tension

C. Both A. and B

D. None of these

8033. Refrigeration cycle_________________?
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A. Violates second law of thermodynamics

B. Involves transfer of heat from low temperature to high temperature

C. Both A. and B

D. Neither A. nor B

8034. When dilute aqueous solutions of two salts are mixed, the process is associated with ___________________?
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A. Decrease in temperature

B. No change in temperature

C. Increase in temperature

D. Change in temperature which is a function of composition

8035. Which of the following identities can be most easily used to verify steam table data for superheated steam ?
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A. (?T/?P)S = (?V/?S)P

B. (?T/?V)S = (?p/?S)V

C. (?P/?T)V = (?S/?V)T

D. (?V/?T)P = -(?S/?P)T
8036. Fugacity and pressure are numerically not equal for the gases__________________?
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A. At low temperature and high pressure

B. At standard state

C. Both A. and B

D. In ideal state

8037. Gibbs free energy at constant pressure and temperature under equilibrium conditions is___________________?
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A. Maximum

B. ?

C. Minimum

D. 0

8038. Which of the following is not an extensive property ?
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A. Free energy

B. Refractive index

C. None of these

D. Entropy

8039. Which of the following is not an intensive property ?
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A. Molar heat capacity

B. Internal energy

C. Viscosity

D. None of these

8040. In the equation, PVn = Constant, if the value of n = 0, then it represents a reversible ______________ process?
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A. Isentropic

B. Isothermal

C. Isometric

D. Isobaric
8041. Entropy of an ideal gas depends upon its__________________?
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A. Pressure

B. Temperature

C. Both A. & B

D. Neither A. nor B

8042. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the__________________?
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A. Either A. or B

B. Cold reservoir approaches zero

C. Neither A. nor B

D. Hot reservoir approaches infinity

8043. Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of _____________________?
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A. Fusion

B. Transition

C. Sublimation

D. Vaporisation

8044. The chemical potential of a component (?i) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by_________________?
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A. (?G/?ni)T, P, nj = (?A/?ni) T, v, nj

B. (?E/?ni)S, v, nj

C. All (A), B. and (C)

D. (?H/?ni)S, P, nj

8045. Which of the following is not affected by temperature changes ?
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A. Fugacity

B. Activity co-efficient

C. None of these

D. Free energy

8046. Efficiency of a Carnot engine working between temperatures T1 and T2 (T1 < T) is ________________?
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A. (T1 T2)/T2

B. (T2 T1)/T2

C. (T2 T1)/T1

D. (T1 T2)/T1

8047. The most important application of distribution law is in_____________________?
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A. Evaporation

B. Drying

C. Distillation

D. Liquid extraction
8048. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is________________?
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A. Positive

B. None of these

C. Negative

D. Zero

8049. A large iceberg melts at the base, but not at the top, because of the reason that_________________?
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A. The iceberg remains in a warmer condition at the base

B. All A, B. and C

C. Due to the high pressure at the base, its melting point reduces

D. Ice at the base contains impurities which lowers its melting point

8050. A domestic refrigerator has a/an ____________ cooled condenser?
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A. Gas

B. Air

C. Evaporative

D. Water