chemical engineering mcqs to prepare for nts, kppsc, fpsc, ppsc and more

chemical engineering Mcqs

7801. Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyll and haemoglobin breakdown of some animals, beyond TLV (>50 ppm) ?
0

A. Causes asphyxia

B. Acts as a green house gas thereby raising earths temperature

C. Enhances the green house effect

D. Causes increase in sea level

7802. A body which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the________________?
0

A. Ionosphere

B. Global warming

C. Green house

D. Atmospheric effect

7803. A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from ______________ ppm?
0

A. 10000 to 100000

B. 1000 to 2000

C. 6000 to 9000

D. 3000 to 6000

7804. Biological oxidation ponds remove organic matters present in the polluted water by _______________?
0

A. Using the activities of bacteria and other micro organisms

B. Aerobic oxidation

C. Both A. & B.

D. Neither A. nor B.

7805. Photochemical smog is formed from automobile exhaust ________________?
0

A. Appears only on sunny days

B. By reaction of hydrocarbon & nitric oxide in presence of sunlight

C. Is harmful for crops and trees also besides causing eye irritation & asthma

D. All A., B. & C.

7806. Exposure to SO2 containing chimney gases results in the__________________?
0

A. Reduction in strength of leather & cloth

B. Acceleration of corrosion rates of metals

C. Increased drying & hardening time of paints

D. All A., B. and C.

7807. The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1. x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is__________________?
0

A. Ax2

B. Ax12

C. Ax1

D. A . x22

7808. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about ______________ decibels?
0

A. 95

B. 140

C. 75

D. 120

7809. Presence of soluble organics in polluted water causes_________________?
0

A. Fire hazards

B. Depletion of oxygen

C. Undesirable plants growth

D. Explosion hazards

7810. Particles having diameter greater than 75 ?m (micrometer = 10-6 mm) are called__________________?
0

A. Powder

B. Smoke

C. Grit

D. Dust

7811. Pneumoconiosis is a disease caused by the inhalation of ______________ dust?
0

A. Uranium ore

B. Coal

C. Lime

D. Iron ore

7812. The lowest layer of atmosphere is known as the_____________________?
0

A. None of these

B. Stratosphere

C. Ionosphere

D. Troposphere

7813. Noise level inside a jet airliner in normal flight is about ______________ decibels?
0

A. 100

B. 125

C. 80

D. 150

7814. Presence of bacteria in potable (drinking) water causes_________________?
0

A. Bad taste & colour

B. Turbidity

C. Bad odour

D. Disease

7815. The resistance of water to the passage of light through it is a measure of the___________________?
0

A. Hardness

B. Dissolved gases

C. Turbidity

D. Color

7816. The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the_________________?
0

A. Statement of Vant Hoff Equation

B. Le-Chateliers principle

C. Lewis-Randall rule

D. None of these

7817. COD of raw municipal sewage may be in the range of about _____________ mg/litre?
0

A. 90-120

B. 2-Jan

C. 1500-2500

D. 10-May

7818. Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundries causes___________________?
0

A. Shortness of breath

B. All A., B. and C.

C. Asphyxiation (suffocation)

D. Tuberculosis

7819. Aerosols present in atmospheric air may be__________________?
0

A. Combination of all A., B. & C.

B. Negatively charged

C. Positively charged

D. Neutral

7820. In the context of the chemical process industries, the term BOD is normally associated with the_____________________?
0

A. Organic concentration in gaseous effluents

B. Characterisation of solid wastes

C. Characterisation of liquid effluents

D. Characterisation of boiler feed water

7821. In sewage treatment, its sedimentation is speeded up by commonly adding__________________?
0

A. Sodium sulphate

B. Lime

C. Hydrochloric acid

D. Copper sulphate

7822. The Killer gas which caused Bhopal gas tragedy in 1984 was________________?
0

A. Sulphur dioxide

B. Methyl isocyanate (MIC)

C. Phosgene

D. Carbon monoxide

7823. Most of the atmospheric air pollutants are present in large quantity in__________________?
0

A. Stratosphere

B. Mesosphere

C. Troposphere

D. Thermosphere

7824. Arsenic pollutant is not generated in _______________ industries?
0

A. Tanneries

B. Any of these

C. Glass & ceramic

D. Beverages

7825. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes_______________?
0

A. Foaming

B. Odour nuisances

C. Undesirable plant growth

D. Turbidity

7826. The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is_________________?
0

A. Pipe vibrations

B. Boundary layer separation

C. Cavitation

D. Fluctuation in liquid flow

7827. A man exposed to excessive noise level in the working environment may suffer from____________________?
0

A. Rupture of ear drum

B. Hearing loss

C. All A., B. & C.

D. Nervousness & fatigue

7828. The common pollutant generated in chlor-alkali industry and battery manufacture is ___________________?
0

A. Mercury

B. None of these

C. Phosphate

D. Brine

7829. The maximum CO2 is emitted into the atmosphere by_________________?
0

A. Biomass burning

B. Trees

C. Combustion

D. Urea

7830. Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about ____________ decibels?
0

A. 7

B. 30

C. 3

D. 70

7831. Soluble silica present in boiler feed water can be removed by______________________?
0

A. Preheating it

B. Filtration

C. Coagulation

D. Anion exchanger

7832. TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes_________________?
0

A. Bone disease

B. Skin disorder

C. Bronchitis

D. Cancer

7833. Corrosion in boilers can be prevented by _________________?
0

A. prevents corrosion

B. Enhancing pH of feed water by adding alkali

C. All A., B. and C.

D. Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen

E. Deaeration of feed water

7834. Smoke is produced due to__________________?
0

A. Poor quality of fuel and improper mixing of fuel & combustion air

B. All A., B. and C.

C. Poor design & overloading of furnace

D. Insufficient supply of combustion air and insufficient time for combustion

7835. Methyl isocyanate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of ______________ toxic gas?
0

A. Highly

B. Extremely

C. Moderately

D. Very extremely

7836. Lagooning process is mainly a means of the__________________?
0

A. None of these

B. Biological treatment of wastes

C. Sludge disposal

D. Reduction of excessive flow in sewers

7837. Safe limit called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the____________________?
0

A. Burning of domestic fuel

B. Industrial chimney exhaust

C. Automobiles exhaust

D. Photochemical reaction in polluted atmosphere

7838. Water filtration rate in a slow sand filter ranges from ____________ litres/m2/hr?
0

A. 100 to 200

B. 4000 to 5000

C. 10 to 20

D. 1500 to 2500

7839. The detrimental effect on organism and water quality with temperature rise of aquatic system is the reduction of _____________ of water?
0

A. Dissolved oxygen content

B. All A., B. and C.

C. Biological oxygen demand

D. Vapor pressure

7840. Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N2 in contaminated air at which it acts as a natural asphyxiate is ? _____________ percent?
0

A. 80

B. 92

C. 88

D. 84

7841. Which of the following is the most severe air pollutant ?
0

A. Hydrocarbons

B. SO2

C. NOx

D. CO

7842. Noise level during normal conversation among men is about ______________ decibels?
0

A. 10

B. 45

C. 115

D. 90

7843. The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant ?
0

A. Chlorine

B. Alkyl benzene sulphonate (ABS)

C. Alkalis

D. Benzene hexachloride

7844. Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?
0

A. NOx

B. F

C. Hg

D. SO2

7845. Infective bacteria in water is killed by the _____________ process?
0

A. Disinfection

B. Sterilisation

C. Aeration

D. None of these

7846. Deaeration of high pressure boiler feed water is done to reduce ___________________?
0

A. Its dissolved oxygen content

B. Foaming from boilers

C. Caustic embrittlement

D. Its silica content

7847. A shallow pond in which the sewage is retained and biologically treated is called__________________?
0

A. Lagoon

B. Skimming tank

C. Oxidation

D. Imhoff tank

7848. Which of the following air pollutants is not toxic to vegetation i.e., doesnt cause vegetation damage ?
0

A. Smog & ozone

B. Carbon monoxide

C. Sulphur dioxide & spray of weed killers

D. Hydrogen fluoride & nitrogen oxides

7849. Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by__________________?
0

A. Biological oxygen pond

B. Lagoons

C. Filtration

D. Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)

7850. There is a change in ______________ during the phase transition?
0

A. All a, b & c

B. Volume

C. Pressure

D. Temperature

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