1000+ Chemical Engineering Basics MCQ for NEET [Solved]

1. The most important requirement for aluminium industry is the availability of cheap
A. Ore
B. Electrical power
C. Labour
D. Abundant water
Answer : B

2. Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.
A. Forging
B. Cold rolling
C. Hot rolling
D. Casting
Answer : B

3. Principal alloying element in Elinvar (used for making hair springs for watches) is
A. Copper
B. Aluminium
C. Nickel
D. Zinc
Answer : C

4. In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is
A. 1
B. 1.4
C. 1.5
D. Y = C_p/C_v
Answer : A

5. Which of the following materials does not form adherent oxide film on surface?
A. Copper
B. Nickel
C. Aluminium
D. Gold & silver
Answer : D

6. __________ is the most suitable lubricant for drawing mild steel wires?
A. Kerosene
B. Water
C. Sodium stearate
D. Lime water
Answer : C

7. Maximum change in the hardness of martensite occurs in the carbon content range of __________ percent in steel.
A. 0.01 to 0.10
B. 0.2 to 0.4
C. 0.5 to 0.7
D. 0.8 to 1.0
Answer : B

8. A jet engine turbine blade is normally manufactured by
A. Forging
B. Shell moulding
C. Investment casting
D. Pressure die casting
Answer : C

9. In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of
A. Stainless steel
B. Mild steel
C. High speed steel
D. High carbon steel
Answer : C

10. Biological shield in a nuclear reactor is generally provided to protect against the
A. ?-rays
B. ?-rays
C. Gamma rays & neutrons
D. Electrons
Answer : C

11. Powder metallurgy process does not make metal powder by
A. Atomisation
B. Grinding/milling
C. Hammering
D. Electrolytic deposition
Answer : C

12. For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
A. Increases
B. Decreases
C. Remain constant
D. Increases to a maximum before decreasing
Answer : A

13. About __________ ton of coke is required in a cupola to produce one ton of casting.
A. 0.03
B. 0.3
C. 0.8
D. 1.5
Answer : B

14. With increase in steam pressure, its specific volume decreases
A. Rapidly first and then slowly
B. Linearly
C. Slowly first and then rapidly
D. Exponentially
Answer : A

15. The same volume of all gases is representative of their
A. Specific gravities
B. Densities
C. Gas characteristic constants
D. Molecular weights
Answer : D

16. On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.
A. Frequency
B. Amplitude
C. Damping
D. None of these
Answer : A

17. Wavelength of radiation emitted by a body depends on the __________ of its surface.
A. Temperature
B. Area
C. Nature
D. All 'a', 'b' & 'c'
Answer : A

18. Steel is welded using the __________ flame.
A. Carburising
B. Neutral
C. Oxidising
D. All (A), (B) & (C)
Answer : B

19. Percentage of differential pressure lost in a Venturimeter with a tapering of 15° may be about
A. 1
B. 10
C. 25
D. 50
Answer : B

20. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
A. Range is 15°F
B. Approach is 10°F
C. Both (A) & (B)
D. Neither (A) nor (B)
Answer : C

21. The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.
A. Air
B. Water
C. Mercury
D. Alcohol
Answer : B

22. Gas turbine normally employs a constant __________ cycle.
A. Pressure
B. Temperature
C. Volume
D. None of these
Answer : A

23. The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.
A. 100
B. 200
C. 1000
D. 2000
Answer : B

24. 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

25. Elimination of brittleness resulting from welding of saw blades is done by __________ of the welded portion.
A. Annealing
B. Toughening
C. Work hardening
D. Tempering
Answer : A

26. The best lubricants for a machine working at high temperature & load is
A. Grease
B. Solid lubricant
C. Animal oils
D. Mineral oils
Answer : B

27. Pick out the correct statement about the condensation.
A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation
B. Suitable coating or vapour additive is used to promote film wise condensation
C. If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it
D. Reynolds number of condensing liquid is based on its mass flow rate
Answer : B

28. Austempering process results in the formation of __________ structure.
A. Martensitic
B. Bainitic
C. Carburised
D. Stressed
Answer : B

29. The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the
A. Work hardening
B. Bauschinger effect
C. Creeping effect
D. Stress recovery effect
Answer : B

30. __________ test can be termed as the semidestructive test.
A. Impact
B. Torsion
C. Hardness
D. Charpy
Answer : C

31. Hydrogen in liquid steels is dissolved
A. As tiny gas bubbles
B. In the atomic form
C. In the ionic form
D. In the molecular form
Answer : A

32. Fine grained steels have
A. High brittleness
B. Higher tendency to distort
C. High ductility
D. None of these
Answer : C

33. 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

34. An ideal material for making cooking vessels should have
A. High heat capacity
B. Low heat capacity
C. High thermal conductivity
D. Both (B) and (C)
Answer : D

35. The ratio of the shear stress to the principal stress on a principal plane is
A. 0
B. 1
C. 1/2
D. 1/3
Answer : A

36. Between 230 and 370°C, blue brittleness is caused in mild steel because of the
A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young's modulus
D. Strain hardening
Answer : B

37. 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

38. Pick out the wrong statement.
A. Molecules with symmetrical arrangements (e.g. CH₄ or CCl₄) are non-polar
B. Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise
C. Most of the hydrocarbons are non-polar
D. None of these
Answer : D

39. Pick out the wrong statement.
A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
D. Tungsten steel and alnico are not hard magnetic materials
Answer : D

40. Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans?
A. Emissivity of pipe surface
B. Diameter & length of the pipe
C. Temperature of hot pipe surface & that of air in the room
D. None of these
Answer : D

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

42. Holes for riveting purposes should be preferably made by
A. Cutting torch
B. Drilling
C. Punching
D. None of these
Answer : B

43. Stainless steel is welded using
A. Oxy-acetylene flame
B. Oxy-hydrogen flame
C. Arc welding
D. Inert gas arc welding
Answer : D

44. 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

45. Which of the following is not the commercial name of poly-methyl-methacrylate (PMMA)?
A. Styrofoam
B. Lucite
C. Perspex
D. Plexiglass
Answer : A

46. Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area; in the casting)
A. V/A
B. V/A²
C. V²/A
D. V²/A²
Answer : D

47. When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the
A. Partial pressure of water vapour is less than the total pressure
B. Humidity is < 100% & dew point temperature of air has not reached
C. Dew point temperature of air has not reached & air is not saturated fully
D. Air is fully saturated
Answer : D

48. The type of pump used for lifting large quantity of sewage is a __________ pump.
A. Gear
B. Centrifugal
C. Reciprocating
D. Plunger
Answer : B

49. The main reducing agent in iron blast furnace is
A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air
Answer : B

50. Steam condenser tubes are made of admiralty brass, in which percentage of zinc & copper are __________ respectively.
A. 70 & 30
B. 30 & 70
C. 50 & 50
D. 90 & 10
Answer : A