1000+ Engineering Materials Multiple Choice Question Answer [Solved]

1. Which of the following is added in low carbon steels to prevent them from becoming porous?
A. Sulphur
B. Phosphorus
C. Manganese
D. Silicon
Answer : D

2. Solder is an alloy consisting of
A. Tin, antimony, copper
B. Tin and copper
C. Tin and lead
D. Lead and zinc
Answer : B

3. The hardness of steel primarily depends on
A. Percentage of carbon
B. Percentage of alloying elements
C. Heat treatment employed
D. Shape of carbides and their distribution in iron
Answer : D

4. High carbon steel carries carbon percentage
A. 0.1 to 0.3 %
B. 0.3 to 0.6 %
C. 0.6 to 0.8 %
D. 0.8 to 1.5 %
Answer : D

5. Eutectoid reaction occurs at
A. 600°C
B. 723°C
C. 1147°C
D. 1493°C
Answer : B

6. Hardness of martensite is about
A. RC 65
B. RC 48
C. RC 57
D. RC 80
Answer : A

7. Basic constituents of Monel metal are
A. Nickel, copper
B. Nickel, molybdenum
C. Zinc, tin, lead
D. Nickel, lead and tin
Answer : A

8. The usual composition of a soldering alloy is
A. Tin, lead and small percentage of antimony
B. Tin and lead
C. Tin, lead and silver
D. Tin and copper
Answer : A

9. An important property of high silicon (12-18%) cast iron is the high
A. Hardness
B. Brittleness
C. Plasticity
D. Ductility
Answer : A

10. Monel metal is an alloy of
A. Nickel and copper
B. Nickel and chromium
C. Nickel, Chromium and iron
D. Copper and chromium
Answer : A

11. Which of the following alloys does not have copper as one of the constituents?
A. Delta metal
B. Monel metal
C. Constantan
D. Nichrome
Answer : D

12. Pipes for bicycle frames are made of
A. Cold rolled steel
B. Hot rolled steel
C. Forged steel
D. Cast steel
Answer : A

13. Eutectoid steel contains following percentage of carbon
A. 0.02 %
B. 0.3 %
C. 0.63 %
D. 0.8 %
Answer : D

14. When steel containing less than 0.8% carbon is cooled slowly from temperatures above or within the critical range, it consists of
A. Mainly ferrite
B. Mainly pearlite
C. Ferrite and pearlite
D. Pearlite and cementite
Answer : C

15. The strength is the ability of a material to resist
A. Deformation under stress
B. Externally applied forces with breakdown or yielding
C. Fracture due to high impact loads
D. None of these
Answer : B

16. Recrystallisation temperature can be lowered by
A. Purification of metal
B. Grain refinement
C. Working at lower temperature
D. All of the above
Answer : D

17. Which of the following represents the allotropic forms of iron?
A. Alpha iron, beta iron and gamma iron
B. Alpha iron and beta iron
C. Body centred cubic iron and face centred cubic iron
D. Alpha iron, gamma from and delta iron
Answer : D

18. The property of a material which enables it to retain the deformation permanently, is called
A. Brittleness
B. Ductility
C. Malleability
D. Plasticity
Answer : D

19. The alloy used for making electrical resistances and heating elements is
A. Nichrome
B. Invar
C. Magnin
D. Elinvar
Answer : A

20. An example of amorphous material is
A. Zinc
B. Lead
C. Silver
D. Glass
Answer : D

21. The hardness of steel depends upon the
A. Amount of cementite it contains
B. Amount of carbon it contains
C. Contents of alloying elements
D. Method of manufacture of steel
Answer : A

22. Cast iron is characterised by minimum of following percentage of carbon
A. 0.2 %
B. 0.8 %
C. 1.3 %
D. 2 %
Answer : D

23. The machinability of steel is improved by adding
A. Nickel
B. Chromium
C. Nickel and chromium
D. Sulphur, lead and phosphorus
Answer : D

24. The unique property of cast iron is its high
A. Malleability
B. Ductility
C. Surface finish
D. Damping characteristics
Answer : D

25. The hardness and tensile strength in austenitic stainless steel can be increased by
A. Hardening and cold working
B. Normalising
C. Martempering
D. Full annealing
Answer : A

26. The hardness is the property of a material due to which it
A. Can be drawn into wires
B. Breaks with little permanent distortion
C. Can cut another metal
D. Can be rolled or hammered into thin sheets
Answer : C

27. The loss of strength in compression with simultaneous gain in strength in tension due to overloading is known as
A. Hysteresis
B. Creep
C. Visco elasticity
D. Boeschinger effect
Answer : D

28. The charge of the blast furnace consists of
A. Calcined ore (8 parts), coke (4 parts) and limestone (1 part)
B. Calcined ore (4 parts), coke (1 part) and limestone (8 parts)
C. Calcined ore (1 part), coke (8 parts) and limestone (4 parts)
D. Calcined ore, coke and limestone all in equal parts
Answer : A

29. Age hardening is related to
A. Duralumin
B. Brass
C. Copper
D. Silver
Answer : A

30. The crystal structure of brass is
A. F.C.C.
B. B.C.C.
C. H.C.P.
D. Orthorhombic crystalline structure
Answer : A

31. In basic Bessemer process, the furnace is lined with
A. Silica bricks
B. A mixture of tar and burnt dolomite bricks
C. Both (A) and (B)
D. None of these
Answer : B

32. In process annealing, the hypo eutectoid steel is
A. Heated from 30°C to 50°C above the upper critical temperature and then cooled in still air
B. Heated from 30°C to 50°C above the upper critical temperature and then cooled suddenly in a suitable cooling medium
C. Heated from 30°C to 50°C above the upper critical temperature and then cooled slowly in the furnace
D. Heated below or closes to the lower critical temperature and then cooled slowly
Answer : D

33. The alloying element which reduces the formation of iron sulphide in steel is
A. Chromium
B. Nickel
C. Vanadium
D. Manganese
Answer : D

34. Duralumin contains
A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
D. 5 to 6% tin, 2 to 3% copper and rest aluminium
Answer : A

35. The basic constituents of Hastelloy are
A. Aluminium, copper etc.
B. Nickel, molybdenum etc.
C. Nickel, Copper, etc.
D. All of the above
Answer : B

36. Addition of copper to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Answer : C

37. Cast iron has
A. High tensile strength
B. Its elastic limit close to the ultimate breaking strength
C. High ductility
D. All of the above
Answer : B

38. Addition of silicon to aluminium results in
A. Improvement of casting characteristics
B. Improvement of corrosion resistance
C. One of the best known age and precipitation hardening systems
D. Improving machinability
Answer : A

39. Steel contains
A. 80% or more iron
B. 50% or more iron
C. Alloying elements like chromium, tungsten nickel and copper
D. Elements like phosphorus, sulphur and silicon in varying quantities
Answer : B

40. If a refractory contains high content of silicon, it means refractory is
A. Acidic
B. Basic
C. Neutral
D. Brittle
Answer : C

41. The material in which the atoms are arranged regularly in some directions but not in others, is called
A. Amorphous material
B. Mesomorphous material
C. Crystalline material
D. None of these
Answer : B

42. Cartridge brass can be
A. Cold rolled into sheets
B. Drawn into wires
C. Formed into tube
D. Any one of these
Answer : D

43. The percentage carbon content in wrought iron is about
A. 0.02
B. 0.1
C. 02
D. 0.4
Answer : A

44. Which of the following property is desirable in parts subjected to shock and impact loads?
A. Strength
B. Stiffness
C. Brittleness
D. Toughness
Answer : D

45. There are fourteen atoms in a unit cell of
A. Body centred cubic space lattice
B. Face centred cubic space lattice
C. Close packed hexagonal space lattice
D. None of these
Answer : B

46. Ball bearings are, usually, made from
A. Low carbon steel
B. High carbon steel
C. Medium carbon steel
D. Chrome steel
Answer : D

47. Which of the following alloys does not contain tin?
A. White metal
B. Solder admiralty
C. Fusible metal
D. Phosphor bronze
Answer : A

48. The portion of the blast furnace below its widest cross-section is called
A. Hearth
B. Stack
C. Bosh
D. Throat
Answer : C

49. The machinability of aluminium increases when __________ is added to aluminium.
A. Copper
B. Magnesium
C. Silicon
D. Lead and bismuth
Answer : D

50. Which of the following has a fine gold colour and is used for imitation jewellery?
A. Silicon bronze
B. Aluminium bronze
C. Gun metal
D. Babbitt metal
Answer : B