JEE Main - Chemical Engineering Basics 1000+ MCQ [Solved] PDF Download

1. Unbreakable crockeries are made from __________ polymers.
A. Polystyrene
B. Melamine
C. Polystyrene
D. Polyurethane
Answer : D

2. 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

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

4. The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong
A. Base and strong acid
B. Base and weak acid
C. Acid and weak base
D. None of these
Answer : A

5. The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 × 10^-16 m²S^-1 and it is 1.94 × 10^-14 m²S^{- 1} at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is
A. 130
B. 180
C. 230
D. 250
Answer : C

6. Coarse grained steels have
A. Low toughness
B. No tendency to distort
C. High density
D. Very high toughness
Answer : B

7. While the recrystallisation temperature for pure metals is 0.3 T_m, the same for alloys is equal to __________ × T_m (where, T_m Melting temperature).
A. 0.25
B. 0.45
C. 0.70
D. 0.95
Answer : C

8. __________ is used for tying the steel columns to concrete foundation.
A. Grouting
B. Eyebolt
C. Anchor bolts
D. Refractory castables
Answer : C

9. The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is
A. Full annealing
B. Bright annealing
C. Patenting
D. None of these
Answer : C

10. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the
A. Length of the pipe
B. Diameter of the pipe
C. Density of the fluid
D. Velocity of the fluid
Answer : A

11. L.D. (Linz-Donawitz) converter is used in the production of
A. Copper
B. Steel
C. Zinc
D. Aluminium
Answer : B

12. Which of the following is the most suitable abrasive for grinding high tensile strength materials?
A. Silicon carbide
B. Corundum
C. Aluminium oxide
D. Boron carbide
Answer : C

13. Which of the following pairs is not correctly matched?
A. Uranium - 233 : Fertile material
B. Binding energy : Mass defect
C. Scattering: Absorption cross-section
D. Number of nucleons : Mass number
Answer : A

14. Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.
A. Preloaded spring
B. Piezoelectric
C. Bonded strain gauge
D. None of these
Answer : B

15. __________ rubber is generally used for making 'O' rings used for vacuum sealings.
A. Natural
B. Neoprene
C. Butadiene
D. Nitrile
Answer : B

16. 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

17. Two solutions A1 & A2 have pH value of 2 & 6 respectively. It implies that the solution
A. A₁ is more alkaline than solution A₂
B. A₁ is highly acidic
C. A₂ is very slightly acidic
D. Both (B) & (C)
Answer : D

18. Yield strength of a polycrystalline metal with an average grain size d, is proportional to
A. d^1/2
B. d^-1/2
C. d
D. d^-1
Answer : B

19. Rain drops falling through atmospheric air attain limited terminal velocity, because of
A. Upward thrust due to air
B. Viscous force exerted by air
C. Surface tension effects of water
D. Force of gravity
Answer : B

20. Force between the molecules of the same substance is called __________ force.
A. Adhesive
B. Cohesive
C. Molecular
D. Vander Walls
Answer : B

21. The hardenability of steel decreases with
A. Decrease in dislocation density
B. Increase in solutionising temperature
C. Increase in strength
D. Decrease in grain size
Answer : D

22. Super conduction in metals is observed at a temperature of __________ °K.
A. <100
B. >100
C. About 273
D. About 373
Answer : B

24. Runge-Kutta method is used to solve a/an
A. Ordinary differential equation of nth order
B. Simultaneous non-linear equation
C. Linear differential equation
D. None of these
Answer : B

25. Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A. 1/k
B. k
C. k²
D. 1/k²
Answer : B

26. Which of the, following is not associated with the functioning of a petrol engine?
A. Compression ignition system
B. Spark plug
C. Carburettor
D. Otto cycle
Answer : A

27. Constituents of stellite are
A. Zinc, copper & nickel
B. Cobalt, chromium & tungsten
C. Zinc, aluminium & nickel
D. Nickel, cobalt & vanadium
Answer : B

28. __________ is a non volatile film forming constituent of a paint.
A. Thinner
B. Dryer
C. Drying oil
D. None of these
Answer : C

29. Thermal conductivity of a material does not depend upon its
A. Mass
B. Volume
C. Surface area
D. All 'a', 'b' & 'c'
Answer : D

30. Breakeven point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost
A. Only
B. Plus variable cost
C. Plus overhead cost
D. Plus selling expenses
Answer : B

31. Hydro-cyclone is a
A. Crusher
B. wet classifier
C. Dry classifier
D. Magnetic separator
Answer : B

32. 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

33. Fatigue resistance of a material is measured by the
A. Elastic limit
B. Ultimate tensile strength
C. Young's modulus
D. Endurance limit
Answer : D

34. Heat required to raise the temperature of a body by 1 °C is called its
A. Heat capacity
B. Specific heat capacity
C. Thermal conductivity
D. Water equivalent
Answer : A

35. Highest cutting speed is achieved by the __________ tool material.
A. High speed steel
B. Carbide
C. Cast alloy
D. Plain carbon steel
Answer : B

36. Which of the following is the most wear resistant grade of carbide used for the cutting tools?
A. Aluminium carbide
B. Tungsten carbide
C. Nickel carbide
D. Iron carbide
Answer : B

37. Steels with high carbon equivalent have poor Weldability, because in these steels during welding
A. Carbon and other alloying elements get oxidised from the weld pool
B. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D. Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld
Answer : C

38. Sudden fall of atmospheric pressure by a large amount is an indication of the
A. Rain
B. Cold wave
C. Storm
D. Fair weather
Answer : C

39. As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.
A. 110
B. 85
C. 60
D. 45
Answer : B

40. Closeness of packing is maximum in case of __________ crystal lattice.
A. Face centred
B. Simple cubic
C. Body centred
D. None of these
Answer : A

41. Solute atoms which cause yield point phenomenon in mild steel are/is
A. Aluminium
B. Boron
C. Carbon
D. Nitrogen
Answer : C

42. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30%?
A. 9,100
B. 13,000
C. 7,000
D. 2,550
Answer : A

43. 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

44. 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

45. Ammonia leakage in the refrigeration system is detected by
A. Sulphur stick, which on detection gives white smoke
B. Using chemical reagents
C. Its smell
D. Soap solution
Answer : A

46. Which of the following is not the function of a volute casing provided in a centrifugal pump?
A. To reduce the head loss in discharge
B. To increase the pump efficiency
C. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
D. To increase the pump discharge rate
Answer : D

47. Which of the following is not a characteristic observed in material failure by fatigue fracture?
A. Plastic deformation of material does not occur
B. Initiation of crack from below the surface does not occur
C. Initiation of crack occurs on the surface of the machine part
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface
Answer : B

48. Which of the following is not an explosive?
A. TNT
B. CMC
C. RDX
D. Lead azide
Answer : B

49. Cold chisel & hammers are made of
A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel
Answer : B

50. At absolute zero temperature, for any reaction involving condensed phases
A. ? G° = 0 , ? H° = 0
B. ? H° = 0 , ? S° = 0
C. ? S° = 0 , ? E° = 0
D. ? S° = 0 , ? Cp° = 0
Answer : C