TOPIC : MATERIAL SCIENCE (FITTER_TURNER_MACHINIST) || ALL EXAM PREVIOUS YEAR AUTHENTIC GENUINE PAPER

April 22, 2025 0

TOPIC : MATERIAL SCIENCE

S.D SIR (9038159271)

ALL EXAM PREVIOUS YEAR AUTHENTIC GENUINE PAPER 📜 

INSTRUCTOR: SUSHOVAN DAS 


YOUTUBE: TECHNICAL STUDY ZONE 



1. Colourising is the process of coating Steel with (ISRO HSFC ;FITTER 2025)

  1. Lead

  2. Zinc powder 

  3. Tin

  4. Aluminium powder 

Ans: D


2. Galvanizing is the process in which steel is coated with  (ISRO HSFC ;FITTER 2025)

  1. Copper 

  2. Tin

  3. Zinc

  4. Lead

Ans: C


3. Muntz metal is an alloy of (ISRO HSFC ;FITTER 2025)

  1. Copper and zinc 

  2. Copper and tin

  3. Copper and Nickel

  4. Copper and lead 

Ans: A


4. The lead tin based alloy with anti friction properties which is used for making bearings is (ISRO HSFC ;FITTER 2025)

  1. Bronze 

  2. Brass 

  3. Solder 

  4. Babbit metal

Ans: D


5. Which among the following cast iron types is also called as ductile cast iron (ISRO HSFC ;FITTER 2025)

  1. Malleable cast iron 

  2. Nodular cast iron 

  3. Grey cast iron 

  4. White cast iron 

Ans: B


6. Which of the following material has the highest melting point (ISRO HSFC ;FITTER,TURNER, MACHINIST , WELDER 2025)

  1. Copper 

  2. Aluminium 

  3. Tungsten 

  4. Gold 

Ans: C


7. As the percentage of carbon increases in steel it's ______ decreases (ISRO HSFC ;FITTER,TURNER, MACHINIST, WELDER 2025)

  1. Corrosion resistance 

  2. Ultimate strength 

  3. Hardness 

  4. Ductility 

Ans: D


8. Which of the following metals is easiest to machine during turning operations due to its softness and high machinability? (ISRO HSFC ;FITTER 2025)

  1. Titanium 

  2. Aluminium 

  3. Stainless steel 

  4. Inconel

Ans: B


9. Lower critical temperature of plain carbon Steel? (ISRO HSFC ;FITTER,TURNER,MACHINIST,WELDER 2025)

  1. 852° C

  2. 810°C

  3. 723° C

  4. 680°C

Ans : C     


10. Ability of the cutting tool to withstand the cutting forces during machining is called (ISRO HSFC ;MACHINIST 2025)


  1. Toughness 

  2. Strength 

  3. Hardness 

  4. Fatigue resistant 

Ans: A


11. Which material is used in manufacturing gas cylinders?  (ISRO HSFC; WELDER 2025)

  1. Forged steel 

  2. Nickel Steel 

  3. Stainless steel 

  4. Solid drawn Steel

Ans : D


12. Eutectic alloy of tin lead soft solder has composition of (ISRO HSFC; WELDER 2025)

  1. 37% lead , 63% tin 

  2. 47% lead , 53% tin

  3. 54% lead , 46% tin 

  4. 39% lead,  61% tin

Ans : A


13. Which of the following metals have high thermal conductivity? (ISRO HSFC; WELDER 2025)

  1. Brass 

  2. Bronze 

  3. Copper 

  4. Aluminium 

Ans : C


14. Which of the following materials have fibrous structure? (DSSSB INSTRUCTOR ; MACHINIST 2024) 

  1. Wrought iron 

  2. Cast iron 

  3. Bronze 

  4. Cast iron and wrought iron 

Ans : A


15. The property of retaining a cutting tools hardness at elevated temperatures is called____ (DSSSB INSTRUCTOR ; FITTER 2024) 

  1. Black hardness 

  2. Red hardness 

  3. Green hardness 

  4. White hardness 

Ans : A


16. Which of the following is a property of cast iron [RFCL Attendant Gr. I (Mechanical) FITTER 2024] 

  1. Low melting point 

  2. High ductility

  3. Excellent corrosion resistance 

  4. Lightweight 

Ans : A


17. Which type of cast iron is commonly used for engine blocks and machinery bases ?  [RFCL Attendant Gr. I (Mechanical) FITTER 2024] 

  1. White cast iron 

  2. Malleable cast iron 

  3. Ductile cast iron 

  4. Grey cast iron 

Ans : D


18. Which type of cast iron is known for its high carbon content and excellent wire resistance?  [RFCL Attendant Gr. I (Mechanical) FITTER 2024] 

  1. White iron 

  2. Ductile iron

  3. Grey iron 

  4. Malleable iron 

Ans : A


19. What is the typical temperature range maintained in a cupola furnace during the melting

Process? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. 800 - 900°C 

  2.  1000 - 1100°C

  3. 1200 - 1300°C 

  4. 1500 - 1600°C

Ans: D


20. Which property of copper makes it highly suitable for electrical wiring applications? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1.  Low density

  2.  High tensile strength

  3.  High corrosion resistance

  4. High electrical conductivity

Ans: D


21. Which of the following metals is considered non-ferrous and typically used in applications requiring resistance to corrosion? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Copper 

  2. B.Cast iron

  3. Steel 

  4. Wrought iron

Ans: A


22. Which of the following is a primary advantage of using aluminium over steel in industrial applications? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Lower weight

  2. Better machinability

  3. Greater corrosion resistance

  4. Higher tensile strength

Ans : A


23. What is the main purpose of adding limestone to the blast furnace during pig iron production? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Act as reducing agent

  2. Improve hardness

  3. Remove impurities as slag

  4. Increase furnace temperature

Ans : C


24.Which of the following metals is used as a sacrificial anode in galvanization of iron? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Zinc B

  2. Copper

  3. Carbon 

  4. Silicon

Ans : A


25. Which type of plain carbon steel is most suitable for making structural components like beams and girders? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Tool steel 

  2. Low-carbon steel

  3. High-carbon steel 

  4. Medium-carbon steel

Ans: B


26. Which type of coated sheet is commonly used for roofing and cladding applications?

  1. Aluminium

  2.  Stainless steel

  3. Galvanized steel

  4. Tin-plated steel

Ans : C


27. Which of the following film-coating processes is a vapour deposition technique? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1.  Wet etching

  2. Magnetron sputtering

  3. Porcelain enamelling

  4. Metal cladding

Ans : B


28. Aluminium age hard enabled alloys designated as 2000 series by the International Alloy Designation System (IADS) is also popularly known by which of the following names? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Magnalium 

  2. Duralumin

  3. Silumin 

  4. Beryl-aluminium

Ans : B


29. In manufacturing plain carbon steels, what is the main process used to reduce carbon content in molten iron? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Annealing

  2. Tempering

  3. Quenching

  4. Decarburization

Ans : D


30. Which of the following is the primary purpose of the puddling process in metallurgy? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. To create alloyed steel

  2. To purify non-ferrous metals

  3. Increase carbon content in steel

  4. Refine cast iron by removing impurities

Ans : D


31. Cemented joint is one of the widely used joints for rubber and leather belts, what percentage strength of the belt material does the cemented joint possess? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Up to 80 - 85%

  2. Up to 20 - 25%

  3. Up to 40 - 50% 

  4. Up to 30 - 40%

Ans : A


32.  Which of the following raw materials is NOT required in the blast furnace process for producing pig iron? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Coke 

  2. Iron ore

  3.  Aluminium 

  4. Limestone

Ans : C


33. Which metal is known for its excellent machinability and is commonly used in the production of gauges? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Steel 

  2. Pig iron

  3. Cast iron 

  4. Wrought iron

Ans : A


34. Which type of sheet metal is known for its lightweight and high strength-to-weight ratio?[NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1.  Brass 

  2. Copper

  3.  Aluminium 

  4. Galvanized steel

Ans : C


35. Which of the following statements about chemical conversion coatings (chromate-

based) is NOT TRUE?[NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Chromate coatings impart exceptionally high corrosion resistance.

  2. Chromate coatings act as a bonding layer for paints, lacquers, or other organic

finishes.

  1. Chromate coatings can provide specific colours to coats when the coating is in soft condition.

  2. Chromate coatings are sacrificial in nature.

Ans : D


36. Which alloying element is commonly added to aluminium to increase its strength for structural applications? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Zinc 

  2. Copper

  3. Nickel

  4. Chromium

Ans : B


37.Which of the following is NOT TRUE for aluminium and steel? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Aluminium has higher specific gravity than steel

  2. Aluminium exhibits better corrosion resistance than steel in humid conditions

  3. Aluminium has better thermal conductivity than steel

  4. Aluminium has better machinability than steel

Ans : A


38. What is the main fuel a cupola furnace uses to generate the necessary heat for

Melting? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Coke 

  2. Wood

  3. Charcoal 

  4. Natural gas

Ans : A


39. What is the main reason aluminium is favoured in the aerospace industry? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. High density with excellent strength

  2. High melting point and ductility

  3. Low density with strong weight ratio

  4. Corrosion resistance, conductivity

Ans : C


40. Which of the following is a key property of the metal produced through the puddling process? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. High ductility

  2. High brittleness

  3. Low melting point

  4. High corrosion resistance

Ans : A


41. What are the main components of the most widely used lead-based solder, and What is its typical melting point? [NFL  Attendant Gr-I (Mech)- Fitter 2024]

  1. Tin and copper, melting at about 217℃

  2. Tin and lead, melting between 180℃ and 190℃

  3. Silver and gold, melting at around 900 ℃

  4. Zinc and aluminium, melting at approximately 660℃

Ans : B


42. What is the CORRECT sequence of tool materials in increasing order of their ability to

retain their hot hardness? [ NFL Attendant Gr-I (Mech)-Machinist 2024 ]

  1. Cermet, Carbide, Ceramic, Borazon

  2. Borazon, Ceramic, Carbide, Cermet

  3. Carbide, Ceramic, Cermet, Borazon

  4. Ceramic, Carbide, Borazon, Cermet

Ans : A


43. What is the temperature range for forging low carbon steel when a workpiece is heated

depends on the material and the type of forging process?  [NFL Attendant Gr-I (Mech)-Machinist 2024 ]

  1. 700 - 800 ℃

  2. 650 - 920 ℃

  3. 800 - 1300 ℃ 

  4. 450 - 700 ℃

Ans : C


44.  Which one of the following mechanical properties is most essential for the metals to undergo Forging operation?  [NFL Attendant Gr-I (Mech)-Turner 2024 ]


  1. Fusibility 

  2. Plasticity

  3. Elasticity 

  4. Tenacity

Ans :  B


45./ The most commonly used proportion of the alloying elements in high-speed steel is: [NFL Attendant Gr-I (Mech)-Turner 2024 ]

  1. 18% Tungsten, 4% Chromium, 1% Vanadium

  2. 18% Chromium, 4% Cobalt, 1% Tungsten

  3. 18% Cobalt, 4% Tungsten, 1% Chromium

  4. 18% Vanadium, 4% Carbon, 1% Cobalt

Ans : A


46.What is the melting temperature of Soldering? [ MPPEB ITI TO Fitter 2024]

  1. 800℃

  2. 400℃

  3. 90-450℃

  4. 100℃

Ans : 


47. What is aluminum's melting point? [ MPPEB ITI TO Fitter 2024]

  1. 720℃

  2. 670℃

  3. 660℃

  4. 690℃

Ans : C


48. Which property of metals allows them to be hammered into thin sheets? [Gail Technician Mechanical 2024]

  1.  Malleability

  2.  Ductility

  3.  Conductivity

  4. Hardness

Ans : A


49.________  Is a measure of a metal's ability to withstand scratching, wear,  abrasion and penetration. [ISRO URSC FITTER 2024]

  1. Tenacity 

  2. Hardness 

  3. Toughness 

  4. Brittleness 

Ans: B


50. An alloy of lead, tin , copper and antimony  [ISRO URSC FITTER 2024]

  1. Babbit metal 

  2. White metal 

  3. Bronze 

  4. None of the above 

Ans : A


51. stellite is a tool material and is a [ISRO URSC FITTER 2024]

  1. Non metal 

  2. Ferrous material 

  3. Non ferrous material

  4. None of the above 

Ans : C


52. Example of thermoset plastic is? [ISRO URSC FITTER 2024]

  1. Vinyl polymer 

  2. Polycarbonates 

  3. Polyepoxides 

  4. Polysulfone 

Ans : C


53. Inverse steels with 36% Nickel are used in precision instruments due to its property of [ISRO URSC MACHINIST 2024]

  1. Corrosion resistant 

  2. Improved toughness 

  3. List coefficient of thermal expansion 

  4. Non magnetic 

Ans : C


54. The percentage of tungsten in the high speed Steel alloy used for cutting tools is [ISRO URSC MACHINIST 2024] 

  1. 4% 

  2. 20% 

  3. 18%

  4. 1% 

Ans: C


55. The corrosion resistance property of stainless steel is due to the presence of  [ISRO URSC MACHINIST 2024]

  1. Chromium 

  2. Nickel

  3. Manganese 

  4. Cobalt 

Ans : A


56. The synthetic rubber which has good resilience , resistance to wear and aging and used for automobile tyres inner tubes is made of [ISRO URSC MACHINIST 2024]

  1. Neoprene

  2. Butyl

  3. Nitrile Butadiene

  4. Silicon 

Ans : C


57. The ore used to produce lead is known as [ISRO URSC MACHINIST 2024]

  1. Galena 

  2. Pyrite 

  3. Malachite

  4. Calamine 

Ans : A


58. Machine tool beds are most commonly manufactured using the following material [ISRO URSC MACHINIST 2024]

  1. Malleable cast iron 

  2. White cast iron 

  3. Nodular cast iron 

  4. Grey cast iron 

Ans : D


59. The cast iron  used for manufacturing abrasion resistant components which are very hard , difficult to machine and cannot be welded is [ISRO URSC MACHINIST 2024]

  1. Malleable cast iron

  2. Grey cast iron 

  3. White cast iron 

  4. Nodular cast iron 

Ans : C


60. Vanadium is added to Steel to improve the property of [ISRO URSC MACHINIST 2024]

  1. Toughness 

  2. Corrosion resistant 

  3. Hardness 

  4. Strength 

Ans : A


61. Stellite is a trade name for cutting tool materials made of  [ISRO URSC MACHINIST 2024]

  1. Non ferrous cast alloy 

  2. Ferrous cast alloy 

  3. Alloy of carbon and tungsten 

  4. Oxide of aluminium 

Ans : A


62. The property of metal that can be drawn into wire without rapture is [ISRO URSC MACHINIST 2024]

  1. Ductility 

  2. Elasticity 

  3. Malleability 

  4. Tenacity 

Ans : A


63. Which of the following is a characteristic of cermets? [ISRO URSC TURNER 2024]

  1. High hardness 

  2. Racist oxidation 

  3. Low friction 

  4. All of the above

Ans : D


64. Which alloy steel is used for making precious instruments? [ISRO URSC TURNER 2024]

  1. Silicon steel 

  2. Invar

  3. Vanadium 

  4. Manganese steel 

Ans : B


65. Which of the following cutting tool materials is made of aluminium oxide powder in a mould [ISRO URSC TURNER 2024]

  1. Cemented carbides

  2. Stellite

  3. Diamonds 

  4. Ceramic 

Ans : D


66. Arrange the following metals in ascending order of melting points? [ISRO URSC TURNER 2024]

  1. Cast iron , high carbon steel,  medium carbon steel,  wrought iron

  2. Wrought iron , medium carbon steel,  high carbon steel,  cast iron

  3. Medium carbon steel,  high carbon steel, cast iron , wrought iron 

  4. High Carbon Steel,  medium carbon steel, wrought iron, cast iron

Ans : A


67. Specific gravity of mercury is [ISRO SDSC FITTER 2024]

  1. 19.6 

  2. 11.7 

  3. 13.6 

  4. 1.36 

Ans : C


68. Property of metal which offers resistance to Indentation  and scratch is called [ISRO SDSC FITTER 2024]

  1. Stiffness 

  2. Toughness 

  3. Resilience 

  4. Hardness 

Ans : D


69. The property of a metal by virtue of which the metal can withstand shock load is called [ISRO SDSC FITTER 2024]

  1. Hardness 

  2. Brittleness 

  3. Ductility 

  4. Toughness 

Ans : D


70. Galvanizing is a process of  [ISRO SDSC FITTER 2024]

  1. Nickel coating 

  2. Zinc coating 

  3. Aluminium coating 

  4. Gallium coating 

Ans : B


71. Chemical formula for Aluminium sulphate  [ISRO SDSC FITTER 2024]

  1. Al(So4)

  2. Al3(So4)2

  3. Al2(So4)3

  4. Al3(So3)2

Ans : C


72. Which of the following material is most elastic  [ISRO SDSC FITTER 2024]

  1. Rubber 

  2. Steel 

  3. Aluminium 

  4. Wrought iron 

Ans : B


73. Rubber is _____ elastic than mild steel  [ISRO SDSC FITTER 2024]

  1. More

  2. Less

  3. Equal 

  4. None 

Ans : B


74. The atomic symbol of silver is [ISRO SDSC MACHINIST 2024]

  1. Si

  2. S

  3. Au

  4. Ag

Ans : D


75. An example of liquid metal and liquid non metal at room temperature is [ISRO SDSC MACHINIST 2024]

  1. Galium , mercury 

  2. Mercury, chlorine 

  3. Mercury, Bromine 

  4. Bromin , sulphur

Ans : C


76. Which is elastic material? [ISRO SDSC MACHINIST 2024]

  1. Nylon 

  2. Polystyrene 

  3. Celluloid 

  4. Polycarbonate

Ans : A


77. Which alloying element is commonly added to steel to improve its hardenability during heat [ISRO SDSC MACHINIST 2024]

  1. Copper

  2. Chromium 

  3. Nickel 

  4. Manganese 

Ans : B





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