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Nasscom Chemical Engg-Classified Multichoice Questions
Selected from Examination Papers of various Engineering Colleges and Competitive Examinations
1. Nitrogen compounds are not used in the manufacture of
(a) fertilisers
(b) gun powder
(c) tip of match sticks (Ans)
(d) explosive
2. The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the ........ in the solution.
(a) power of hydrogen ion concentration (Ans)
(b) percentage of hydrogen ions
(c) presence of hydrogen ions
(d) none of these
3. Electrode potential is not concerned with the measurement of
(a) pH value
(b) temperature (Ans)
(c) viscosity
(d) density
4. A material lacking in toughness is usually termed as
(a) plastic
(b) malleable
(c) brittle ductile (Ans)
(d) ductile
5. Otto cycle used in spark ignition petrol engines is also known as the constant....... cycle.
(a) volume (Ans)
(b) pressure
(c) heat
(d) none of these
6. Pick out the wrong statement.
(a) In a thin spherical shell under internal pressure, hoop stress is equal to the half of axial stress. (Ans)
(b) Thermoplastic material does not follow Hooke's law of elasticity.
(c) Components under longitudinal compression is called 'struts' and the load under which strut fails is called crippling or buckling load.
(d) At low temperatures (sub-zero) in pressure vessels, the ductility of metal diminishes and brittle fracture occurs while at high temperature in pressure vessels, embitterment of material may take place.
7. X-rays are
(a) positively charged.
(b) negatively charged.
(c) neutral. (Ans)
(d) of higher wavelength than visible light.
8. ............. cycle is the most efficient thermodynamic cycle.
(a) Diesel
(b) Otto
(c) Rankine
(d) Carnot (Ans)
9. What is the pH of distilled water?
(a) 0
(b) 1
(c) 7 (Ans)
(d) 14
10. The hydraulic radius of a circular pipe of diameter 'd' flowing full is
(a) d/4 (Ans)
(b) d/2
(c) 2d/3
(d) d/3
11. ........... number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.
(a) Mach
(b) Reynolds
(c) Froude (Ans)
(d) Weber
12. The factor of safety for brittle materials (having elongation <5%) is based on the ----- stress.
(a) yield
(b) proof
(c) ultimate (Ans)
(d) none of these
13. Which of the following is the terminology used for the temperature at which the phase changes occur in a metal ?
(a) Critical temperature. (Ans)
(b) Recrystallisation temperature.
(c) Phase transformation temperature.
(d) Transition temperature.
14. ...... has the highest melting point out of the following.
(a) Tungsten (Ans)
(b) Zirconium
(c) Molybdenum
(d) Tantalum
15. Gantt charts are used for streamlining the
(a) inventory control
(b) production schedule (Ans)
(c) sales forecasting
(d) quality control
16. Plasma is
(a) a high temperature neutral gas.
(b) nothing but ionised gas. (Ans)
(c) a source of steady and highest controllable pressure.
(d) formed at very low temperature.
17. In a fuel cell, chemical energy is converted into
(a) electrical energy directly. (Ans)
(b) mechanical energy.
(c) electrical energy and stored therein.
(d) none of these.
18. While the bin cards are used in the effective stores management, the queing theory is associated with the ..... time.
(a) waiting (Ans)
(b) idle
(c) inspection
(d) tool replacement
19. Minimum diameter of the tube used for making water manometer should be ....... mm to avoid a correction for the effect of capillarity.
(a) 1
(b) 2.5
(c) 4
(d) 6 (Ans)
20. Cobalt - 60 is used as a source of ...... in medical therapy & industrial radiography.
(a) X-rays
(b) g-rays (Ans)
(c) a-rays
(d) β-rays
21. An example of unsteady non uniform flow is the flow of liquid under pressure through a
(a) tapering pipe at constant flow rate.
(b) tapering pipe at either decreasing or increasing flow rate. (Ans)
(c) long pipeline of constant diameter.
(d) none of these.
22. Which of the following is not an explosive ?
(a) TNT
(b) CMC (Ans)
(c) RDX
(d) Lead azide
23. The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as
(a) rigid
(b) tough
(c) ductile (Ans)
(d) plastic
24. Permanent set in a material is produced by subjecting it to
(a) triaxial loading.
(b) fatigue loading.
(c) stresses beyond the elastic limit. (Ans)
(d) tensile & compressive loads simultaneously.
25. ............. wire is never used for making the heating element.
(a) Nichrome
(b) Kanthal
(c) Invar (Ans)
(d) None of these
26. Milligram of KOH required to saponify 1 gm of oil is called its ..... number.
(a) saponification (Ans)
(b) acid
(c) precipitation
(d) emulsion
27. Ester is formed, when an alcohol reacts with
(a) carboxylic acid (Ans)
(b) aldehyde
(c) ketone
(d) ether
28. Adhesives
(a) can't be used in the form of pressure sensitive tapes.
(b) can't join two dissimilar metals.
(c) cure instantaneously after application on a surface.
(d) none of these. (Ans)
29. The process of removal of scale formed during hot rolling of steel is termed as
(a) descaling
(b) short blasting
(c) pickling (Ans)
(d) skimming
30. Out of the following, the joint produced by ............ has the lowest strength.
(a) soldering (Ans)
(b) welding
(c) brazing
(d) rivetting
31. With increase in carbon percentage in steel, its
(a) yield
(b) elongation percent increases.
(c) tensile strength increases. (Ans)
(d) impact strength increases.
32. The tensile strength of plastics ranges from .......... kg/mm2.
(a) 10 to 50
(b) 50 to 100
(c) 0.01 to 0.1
(d) 0.1 to 10 (Ans)
33. Which of the following is a synthetic abrasive ?
(a) Corundum
(b) Emery
(c) Pumice
(d) Silicon carbide (Ans)
34. A good abrasive
(a) should be friable. (Ans)
(b) should have low refractoriness.
(c) is made up of large size of crystals.
(d) should be soft.
35. Thermoplastics are never moulded using
(a) injection moulding
(b) blow moulding
(c) extrusion
(d) compression moulding (Ans)
36. Which of the following is not a ferromagnetic material ?
(a) Nickel
(b) Cobalt
(c) Aluminium (Ans)
(d) Iron
37. Common salt is produced from sea water in India generally by the ........... method.
(a) freeze drying
(b) solar evaporation (Ans)
(c) electrolytic
(d) none of these
38. Young's modulus of a material is the measure of its
(a) stiffness (Ans)
(b) malleability
(c) creep resistance
(d) tensile strength
39. ..... test is the appropriate test to determine whether a material is ductile or brittle.
(a) Impact (Ans)
(b) Cupping
(c) Hardness
(d) Tensile
40. Which of the following is not an ore of iron ?
(a) Chalcopyrite (Ans)
(b) Magnetite
(c) Hemetite
(d) Limonite
41. Pig iron is
(a) made from cast iron.
(b) made from wrought iron.
(c) the one, which comes out of the blast furnace. (Ans)
(d) free from impurities.
42. Annealing of cast iron
(a) softens it to facilitate machining. (Ans)
(b) decreases the free carbon.
(c) increase the strength.
(d) none of these
43. L.D. (Linz-Donawitz) converter is used in the production of
(a) copper
(b) steel (Ans)
(c) zinc
(d) aluminium
44. ........ property of a material is determined by the Herbert Pendulum device.
(a) Hardness (Ans)
(b) Tensile
(c) Toughness
(d) Compressive
45. Galena is an ore of
(a) iron
(b) copper
(c) lead (Ans)
(d) aluminium
46. Chalcopyrite is an ore of
(a) lead
(b) aluminium
(c) copper (Ans)
(d) zinc
47. Aluminium is extracted from
(a) chalcocite
(b) bauxite (Ans)
(c) galena
(d) none of these
48. Oxygen content below .... percent in air contaminated with nitrogen does not support combustion and is unsafe for human exposure.
(a) 18
(b) 16 (Ans)
(c) 14
(d) 12
49. Area under the stress-strain curve upto the .... is referred to as the modulus of resilience.
(a) yield strength
(b) elastic limit
(c) proportional limit (Ans)
(d) maximum point
50. The passage between the nozzle and the .......... is called 'sprue' in case of injection moulding.
(a) runner (Ans)
(b) cylinder
(c) mold
(d) none of these
