Chemical Engineering Basics 1000+ MCQ with answer for UPSC IES

1. Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
Answer : B

2. Which of the following is not an ore of copper?
A. Cryolite
B. Azurite
C. Chalcopyrite
D. Malachite
Answer : A

3. Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when
A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters
Answer : A

4. Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.
A. 0.8
B. 7.8
C. 200
D. 10000
Answer : A

5. Unit of viscosity in CGS system is
A.
B.
C.
D.
Answer : A

6. Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines?
A. Air filter
B. Fuel injector
C. Exhaust silencer
D. Battery
Answer : B

7. Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
A. White
B. Cast
C. Wrought
D. Pig
Answer : C

8. __________ are normally subjected to sub-zero treatment.
A. Highly stressed parts
B. Gauges or precision parts
C. Cold rolled sheets
D. Non machinable materials
Answer : B

9. The following thermocouple may be used for measuring temperature upto 1873°K.
A. Chromel-alumel
B. Copper-constantan
C. Platinum-platinum rhodium
D. Iron-constantan
Answer : C

10. Hot working of lead is carried out at
A. 75°C
B. 373°K
C. 150°C
D. Room temperature
Answer : B

11. The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.
A. 140
B. 180
C. 240
D. 280
Answer : D

12. The product out from a cupola is called
A. Wrought iron
B. Pig iron
C. Cast iron
D. None of these
Answer : C

13. Which of the following is not a dielectric material?
A. Cotton, silk and paper
B. Asbestos, glass, porcelain and mica
C. Rubber and polymeric resins
D. All refractory materials
Answer : C

14. Speed of a submarine in deep sea & that of an aeroplane is measured by a/an
A. Pitot tube
B. Hot wire anemometer
C. Rotameter
D. Stroboscope
Answer : A

15. With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.
A. Impact strength
B. Percent elongation
C. Hardness
D. Both 'b' & 'c'
Answer : A

16. The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by
A. Decreasing the surface area of the electrodes
B. Increasing the concentration of zinc sulphate solution
C. Increasing the surface area of the electrodes
D. Increasing the concentration of copper sulphate solution
Answer : D

17. Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.
A. Creep
B. Fatigue
C. Endurance
D. Tensile
Answer : B

18. The activity of pure hydrogen gas at 1000°C and 5 atm pressure
A. Is always less than 1
B. Is always greater than 1
C. Can be 5
D. Depends on the choice of the standard state
Answer : D

19. Pressure required to increase the density of water by about 1% is __________ atmosphere.
A. 10
B. 50
C. 200
D. 1000
Answer : C

20. Tesla metre per ampere (T. m/A) is the unit for the measurement of
A. Magnetic susceptibility
B. Magnetic moment
C. Permeability of free space
D. Flux density
Answer : C

21. Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.
A. Invar
B. Hastelloy
C. Duralumin
D. Monel metal
Answer : A

22. Magnetic permeability of iron is increased by its
A. Decarburising
B. Alloying with cobal
C. Purification
D. Alternate heating & cooling
Answer : B

23. With increase in temperature, the electrical conductivity of semiconductors
A. Increases
B. Decreases
C. Remain constant
D. Either (A) or (B), depends on the type of semi-conductor
Answer : A

24. Addition of __________ to steel does not impart hardness.
A. Nickel
B. Copper
C. Chromium
D. Silicon
Answer : B

25. Which of the following alloying elements is present in maximum percentage in high speed steel?
A. Molybdenum
B. Chromium
C. Tungsten
D. Vanadium
Answer : A

26. The two elements required to form substitutional solid solution should not have
A. Same crystalline structure
B. Same valency
C. Widely differing electronegativity
D. Same atomic sizes
Answer : C

27. Liquid nitrogen containers can be made from
A. Ferritic stainless steel
B. HSLA steel
C. Titanium
D. Austenitic stainless steel
Answer : B

28. In practice, the compression ratio of compression-ignition (CI) engine ranges from
A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70
Answer : A

29. The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the
A. Fatigue strength
B. Creep strength
C. Resilience
D. Endurance limit
Answer : D

30. Air intake for an air compressor should be preferably taken from
A. A site, where cooling towers are located nearby
B. A site, where open coal yard in located nearby
C. An air conditioned room maintained at a temperature of 18°C
D. An outside atmosphere at 10°C
Answer : D

31. Electrostatic separation of minerals from each other is based on their differences in the following property.
A. Densities
B. Magnetic permeabilities
C. Electrical conductivities
D. Hardness
Answer : C

32. Insulation of liquid surface can be achieved by __________ on top of its surface.
A. Floating hollow polypropylene spheres
B. Spraying alumina powder
C. Putting cement
D. None of these
Answer : A

33. Carbon supply in pack carburising process is in the form of
A. Charcoal
B. Calcium carbide
C. Hydrocarbon oil
D. Graphite
Answer : A

34. A spring material should have low
A. Elastic limit
B. Deflection value
C. Fatigue resistance
D. None of these
Answer : D

35. Out of the following, the alloy which has equal percentage of constituents, is
A. White metal
B. Gun metal
C. Duralumin
D. Constantan
Answer : D

36. Cupola produces __________ iron.
A. Pig
B. Cast
C. Wrought
D. Carbon free
Answer : B

37. Lap joints are preferred over butt joints in soldering/brazing, because these joints are
A. Weaker in tension but stronger in shear
B. Weaker in shear but stronger in tension
C. Stronger in both shear and tension
D. The lap joints are easily made
Answer : D

38. Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?
A. Elaiden test
B. Reichert-Meissl value test
C. Hunter value test
D. Iodine value test
Answer : A

39. __________ wire is never used for making the heating element.
A. Nichrome
B. Kanthal
C. Invar
D. None of these
Answer : C

40. Optical activity is a/an __________ property.
A. Additive
B. Constitutive
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

41. In case of a, centrifugal pump, the ratio h₁/h₂ is termed as the __________ efficiency (where, h₁ = actual measured head & h₂ = head imparted to the fluid by impeller).
A. Mechanical
B. Overall
C. Volumetric
D. Impeller
Answer : A

42. Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.
A. 2
B. 3
C. 0.8
D. 6
Answer : B

43. In chemical dehumidification of air
A. Both specific humidity & dry bulb temperature increases
B. Both specific humidity & dry bulb temperature decreases
C. Specific humidity decreases & dry bulb temperature increases
D. Specific humidity increases & dry bulb temperature decreases
Answer : C

44. The rolling process cannot be used to produce
A. Plates
B. Rods
C. Tubes
D. Wires
Answer : C

45. Pick out the wrong statement.
A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region
B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections
D. Brittle materials are generally tested in tension
Answer : B

46. Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to
A. (r₂ - r₁)/r₁. r₂
B. r₁. r₂/(r₂ - r₁)
C. (r₂ + r₁)/r₁. r₂
D. r₁. r₂/(r₂ + r₁)
Answer : B

47. For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg)?
A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas
Answer : D

48. Surface tension of a liquid
A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
D. All (A), (B) & (C)
Answer : D

49. In Imperial Smelting Process for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following:
A. Jet of water at high pressure
B. Blast of air
C. Mixture of water and air
D. Rain of molten lead
Answer : D

50. The joint for soldering is supported by binding wire made of
A. Mild steel
B. Copper
C. Soft iron
D. Stainless steel
Answer : C