MCQOPTIONS
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MCQOPTIONS
This section includes 595 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Na2CO3 is called |
| A. | washing soda |
| B. | soda ash |
| C. | plaster of paris |
| D. | calcite |
| Answer» C. plaster of paris | |
| 2. |
Viscose rayon |
| A. | cannot be made from sulphite pulp. |
| B. | utilises H2SO4, NaOH and CS2 during its manufacture. |
| C. | cannot yield textile grade fibre. |
| D. | none of these. |
| Answer» C. cannot yield textile grade fibre. | |
| 3. |
Function of thinner in a paint is to |
| A. | accelerate the oxidation of oil. |
| B. | prevent gelling of the paint. |
| C. | suspend pigments & dissolve film forming materials. |
| D. | form a protective film. |
| Answer» D. form a protective film. | |
| 4. |
High purity nitrogen is used in |
| A. | making protective gas (95% N2 + 5% H2) for annealing of cold rolled steel strip coils. |
| B. | fire fighting purposes. |
| C. | both (a) & (b). |
| D. | neither (a) nor (b). |
| Answer» D. neither (a) nor (b). | |
| 5. |
DDT should not be allowed to come in contact with iron (during its manufacture) to |
| A. | avoid its decomposition. |
| B. | prevent sulphonation of the monochlorobenzene by the acid catalyst. |
| C. | achieve non-hygroscopic property. |
| D. | none of these. |
| Answer» B. prevent sulphonation of the monochlorobenzene by the acid catalyst. | |
| 6. |
Metallic soap is __________ salt of fatty acids. |
| A. | sodium |
| B. | potassium |
| C. | both sodium & potassium |
| D. | aluminium or calcium |
| Answer» E. | |
| 7. |
Which of the following processes is absent in glass manufacturing process ? |
| A. | Sintering |
| B. | Annealing |
| C. | Shaping or forming |
| D. | Melting |
| Answer» B. Annealing | |
| 8. |
A bio-catalyst produced by living cells which acts independent of the cell is called a/an |
| A. | substrate |
| B. | enzyme |
| C. | nutrient |
| D. | none of these |
| Answer» C. nutrient | |
| 9. |
Hydrazine is largely used |
| A. | as a starting material for 'hypo'. |
| B. | in photographic industry. |
| C. | as rocket fuel. |
| D. | in printing industry. |
| Answer» D. in printing industry. | |
| 10. |
Rosin soap is added during paper manufacture to |
| A. | impart adhesive properties. |
| B. | improve opacity. |
| C. | impart resistance to penetration by liquids. |
| D. | none of these. |
| Answer» D. none of these. | |
| 11. |
Nylon 66 is so named because the |
| A. | average degree of polymerisation of the polymer is 1966. |
| B. | number of carbon atoms between two nitrogen atoms are 6. |
| C. | number of nitrogen atoms between two carbon atoms are 6 |
| D. | polymer was first synthesised in 1966. |
| Answer» B. number of carbon atoms between two nitrogen atoms are 6. | |
| 12. |
20% oleum means that in 100 kg oleum, there are 20 kg of |
| A. | SO3 and 80kg of H2SO4. |
| B. | H2SO4 and 80kg of SO3. |
| C. | SO3 for each 100 kg of H2SO4. |
| D. | none of these. |
| Answer» B. H2SO4 and 80kg of SO3. | |
| 13. |
Fluorescent dyes are added in detergents to |
| A. | act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics. |
| B. | attain distinctiveness from other brands. |
| C. | act as tarnish inhibitor for metals like German silver. |
| D. | none of these |
| Answer» B. attain distinctiveness from other brands. | |
| 14. |
Finely ground calcium aluminate & silicate is a/an |
| A. | cermet |
| B. | cement |
| C. | abrasive |
| D. | explosive |
| Answer» C. abrasive | |
| 15. |
Which of the following additives/water proofing agents is added to lower the hydrophilic (moisture loving) characteristic of cement ? |
| A. | Xanthates |
| B. | Stearic acid |
| C. | Calcium & aluminium stearate |
| D. | Formic acid |
| Answer» D. Formic acid | |
| 16. |
Which allotrope of sulphur is insoluble in carbon disulphide ? |
| A. | Rhombic sulphur |
| B. | Monoclinic sulphur |
| C. | Plastic sulphur |
| D. | Milk of sulphur |
| Answer» D. Milk of sulphur | |
| 17. |
The most commonly used substance to speed up the sedimentation of sewage is |
| A. | lime |
| B. | sulphuric acid |
| C. | chlorine |
| D. | sodium bisulphite |
| Answer» B. sulphuric acid | |
| 18. |
Which of the following is used as a binding material in soap to improve soap texture ? |
| A. | Rosin |
| B. | Borax |
| C. | Benzyl acetate |
| D. | Sodium carbonate |
| Answer» C. Benzyl acetate | |
| 19. |
Highly porous refractory bricks are |
| A. | less susceptible to chemical attack by molten fluxes and gases etc. |
| B. | very strong. |
| C. | having very high thermal conductivity. |
| D. | none of these. |
| Answer» E. | |
| 20. |
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils |
| A. | cause cholesterol build up and blood clotting. |
| B. | are prone to rancid oxidation. |
| C. | always contain some amount of nickel (as their complete removal is very difficult). |
| D. | have affinity to retain harmful sulphur compounds. |
| Answer» B. are prone to rancid oxidation. | |
| 21. |
Bromides contained in hot mother liquor is treated with __________ during manufacture of bromine from sea water. |
| A. | SO3 |
| B. | Cl2 |
| C. | NH3 |
| D. | SO2 |
| Answer» C. NH3 | |
| 22. |
How much temperature is maintained during quicklime manufacture in the calcination zone of the vertical shaft kiln? |
| A. | 500°C |
| B. | 750°C |
| C. | 1000°C |
| D. | 1500°C |
| Answer» D. 1500¬∞C | |
| 23. |
In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the |
| A. | diamine and the ring. |
| B. | dibasic acid and the ring. |
| C. | diamine and the dibasic acid. |
| D. | none of these. |
| Answer» D. none of these. | |
| 24. |
A 'unit process' is exemplified by the |
| A. | distillation |
| B. | hydrogenation of oils |
| C. | absorption |
| D. | humidification |
| Answer» C. absorption | |
| 25. |
Hydrogenation of edible vegetable oils |
| A. | is an exothermic reaction. |
| B. | increases their melting point. |
| C. | is done in presence of nickel catalyst. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 26. |
Trinitrotoluene (TNT), an explosive, is made by the nitration of |
| A. | nitrobenzene |
| B. | toluene |
| C. | nitrotoluene |
| D. | benzene |
| Answer» C. nitrotoluene | |
| 27. |
Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre. |
| A. | cutting |
| B. | fibrillation |
| C. | hydration |
| D. | strengthening |
| Answer» E. | |
| 28. |
The product obtained on mixing calcium oxide with water is called |
| A. | quicklime |
| B. | slaked lime |
| C. | milk of lime |
| D. | none of these |
| Answer» C. milk of lime | |
| 29. |
Ca(OH)2 is called |
| A. | quicklime |
| B. | slaked lime |
| C. | limestone |
| D. | gypsum |
| Answer» C. limestone | |
| 30. |
Coagulant is used __________ filtration. |
| A. | before |
| B. | after |
| C. | during |
| D. | to avoid |
| Answer» B. after | |
| 31. |
Average sulphur content in Indian pyrites is about __________ percent. |
| A. | 15 |
| B. | 35 |
| C. | 55 |
| D. | 70 |
| Answer» C. 55 | |
| 32. |
The basic constituent of vegetable oils is |
| A. | triglyceride |
| B. | fatty acids |
| C. | fatty alcohol |
| D. | mono esters |
| Answer» B. fatty acids | |
| 33. |
Sizing material is incorporated in paper to |
| A. | impart resistance to penetration by liquids. |
| B. | increase its thickness. |
| C. | increase its flexibility & opacity. |
| D. | increase its brightness. |
| Answer» B. increase its thickness. | |
| 34. |
Catalyst used during the manufacture of 'Vanaspati Ghee' is |
| A. | zinc |
| B. | nickel |
| C. | platinum |
| D. | copper |
| Answer» C. platinum | |
| 35. |
Transparent soaps (e.g. Pears) are |
| A. | usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency. |
| B. | metallic soaps with frothing agent and free stearic acid to achieve transparency. |
| C. | metallic soaps with frothing agent from which glycerine has not been recovered. |
| D. | none of these. |
| Answer» B. metallic soaps with frothing agent and free stearic acid to achieve transparency. | |
| 36. |
Nickel is not used as a catalyst in the |
| A. | Fischer-Tropsch process. |
| B. | shift conversion. |
| C. | hydrogenation of oil. |
| D. | Ostwald's process of HNO3 manufacture. |
| Answer» E. | |
| 37. |
In premitive days, __________ was being manufactured by Leblanc Process. |
| A. | alum |
| B. | washing soda |
| C. | soda ash |
| D. | calcium carbide |
| Answer» D. calcium carbide | |
| 38. |
The purpose of tanning in leather industry is to |
| A. | stiffen the leather. |
| B. | smoothen the leather. |
| C. | make it flexible. |
| D. | impart water resistance. |
| Answer» B. smoothen the leather. | |
| 39. |
Helium is produced on commercial scale from |
| A. | air |
| B. | natural gas |
| C. | coke oven gas |
| D. | none of these |
| Answer» C. coke oven gas | |
| 40. |
The purpose of adding Na2CO3 to water of low alkalinity is to |
| A. | permit the use of alum as a coagulant. |
| B. | increase the softening capacity of zeolite. |
| C. | facilitate easy regeneration of zeolite. |
| D. | all (a), (b) and (c). |
| Answer» B. increase the softening capacity of zeolite. | |
| 41. |
Sea weeds are an important source of |
| A. | fluorine |
| B. | chlorine |
| C. | bromine |
| D. | iodine |
| Answer» E. | |
| 42. |
Impurities present in brine is normally removed by treatment with |
| A. | NH3 and CO2. |
| B. | lime and soda ash. |
| C. | lime, ammonia and carbon. |
| D. | all (a), (b) and (c). |
| Answer» E. | |
| 43. |
Manufacture of phthalic anhydride uses __________ as a catalyst. |
| A. | Ni |
| B. | Cr |
| C. | V2O5 |
| D. | Al2O3 |
| Answer» D. Al2O3 | |
| 44. |
Which of the following is not responsible for causing permanent hardness of water ? |
| A. | Ca(HCO3)2 |
| B. | CaCl2 |
| C. | MgCl2 |
| D. | none of these |
| Answer» B. CaCl2 | |
| 45. |
Saponification number of an oil or fat |
| A. | gives an idea about its molecular weight. |
| B. | is inversely proportional to its molecular weight. |
| C. | detects its adulteration. |
| D. | all (a), (b) & (c). |
| Answer» E. | |
| 46. |
Nylon 6-6 is manufactured from |
| A. | hexamethylene diamine and adipic acid. |
| B. | hexamethylene diamine and maleic anhydride. |
| C. | caprolactum. |
| D. | dimethyl terephthalate and ethylene glycol. |
| Answer» B. hexamethylene diamine and maleic anhydride. | |
| 47. |
Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have |
| A. | high electrical insulation properties. |
| B. | sharp melting points. |
| C. | low co-efficient of thermal expansion. |
| D. | compressive strength much greater than their tensile strengths. |
| Answer» C. low co-efficient of thermal expansion. | |
| 48. |
Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale. |
| A. | nickel |
| B. | vanadium |
| C. | alumina |
| D. | iron |
| Answer» C. alumina | |
| 49. |
__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia. |
| A. | Solvay |
| B. | Ostwald's |
| C. | Haber's |
| D. | none of these |
| Answer» C. Haber's | |
| 50. |
Triple superphosphate is manufactured by reacting |
| A. | phosphate rock with phosphoric acid. |
| B. | phosphate rock with sulphuric acid. |
| C. | phosphate rock with nitric acid. |
| D. | ammonium phosphate with phosphoric acid. |
| Answer» B. phosphate rock with sulphuric acid. | |