McqMate
| 1. |
Heating elements of electrical heaters are made of |
| A. | Nichrome |
| B. | Tungsten |
| C. | Invar |
| D. | Nicheloy |
| E. | Phosphor bronze |
| Answer» A. Nichrome | |
| 2. |
Which of the following element does not impart hardness to steel? |
| A. | Copper |
| B. | Nickel |
| C. | Silicon |
| D. | Chromium |
| E. | None of the above |
| Answer» A. Copper | |
| 3. |
The property which enables metals to be drawn into wire is known as |
| A. | Plastic deformation |
| B. | Ductility |
| C. | Malleability |
| D. | Elastic deformation |
| E. | Straining |
| Answer» B. Ductility | |
| 4. |
Endentor used in Vickers hardness testing machine is |
| A. | Diamond square-based pyramid |
| B. | 10 mm dia ball |
| C. | 15 mm dia ball |
| D. | 25 mm dia ball |
| E. | Conical indentor with 120? apex angle |
| Answer» A. Diamond square-based pyramid | |
| 5. |
When steel is made from phosphatic iron, it is likely to be |
| A. | Hard |
| B. | Ductile |
| C. | Brittle |
| D. | Tough |
| E. | Malleable |
| Answer» C. Brittle | |
| 6. |
Compressive strength is highest in case of |
| A. | Mild steel |
| B. | Wrought iron |
| C. | High carbon steel |
| D. | Cast iron |
| E. | Low carbon steel |
| Answer» C. High carbon steel | |
| 7. |
In nodular iron, graphite is present in the form of |
| A. | Powder |
| B. | Flakes |
| C. | Needles |
| D. | Spheroids |
| E. | Prisms |
| Answer» D. Spheroids | |
| 8. |
Which hardening process is generally not used for steels? |
| A. | Age hardening |
| B. | Pack carburising |
| C. | Induction hardening |
| D. | Nitriding |
| E. | Cyanidin |
| Answer» A. Age hardening | |
| 9. |
The flux used in brazing is usually |
| A. | Common salt |
| B. | Lime |
| C. | Borax |
| D. | Alum |
| E. | None of the above |
| Answer» C. Borax | |
| 10. |
The electrical conductivity of ferrites is |
| A. | Very high as compared to that of ferromagnetic materials |
| B. | Greater than that of ferromagnetic materials |
| C. | Equal to that of ferromagnetic materials |
| D. | Very low as compared to that of ferromagnetic materials |
| E. | Less than that of ferromagnetic materials |
| Answer» E. Less than that of ferromagnetic materials | |
| 11. |
For normalizing, steel is heated to |
| A. | 900?C |
| B. | 30?C to 60?C above critical temperature |
| C. | 700?C |
| D. | 100?C below critical temperature |
| E. | Critical temperature |
| Answer» B. 30?C to 60?C above critical temperature | |
| 12. |
Steel recommended for induction hardening should have |
| A. | Rough surface |
| B. | Fine grains |
| C. | Low electrical and thermal conductivity |
| D. | Coarse grains |
| E. | Low alloy content |
| Answer» B. Fine grains | |
| 13. |
Major constituent of phosphor bronze is |
| A. | Zinc |
| B. | Copper |
| C. | Phosphorous |
| D. | Aluminium |
| E. | Lead |
| Answer» B. Copper | |
| 14. |
Which of the following material is used for permanent magnets? |
| A. | Duralumin |
| B. | Elnivar |
| C. | Delta metal |
| D. | Invar |
| E. | Alnico |
| Answer» E. Alnico | |
| 15. |
If the steel at room temperature is magnetic, the presence of which constituent can be ruled out? |
| A. | Ferrite |
| B. | Pearlite |
| C. | Austenite |
| D. | Cementite |
| E. | None of the above |
| Answer» C. Austenite | |
| 16. |
Which of the following is usually made of high carbon steel? |
| A. | Channels |
| B. | Die blocks |
| C. | Hammers |
| D. | Solid drawn tubes |
| E. | Angle iron |
| Answer» C. Hammers | |
| 17. |
Nodular iron has low |
| A. | Melting point |
| B. | Tensile strength |
| C. | Fluidity |
| D. | Machinability |
| E. | Rapid heating |
| Answer» A. Melting point | |
| 18. |
In order to improve machinability of stainless steels |
| A. | 0.2 percent selenium is added |
| B. | 0.35 percent sulphur is added |
| C. | 0.5 percent manganese is added |
| D. | (A) and (B) above |
| E. | (B) or (C) above |
| Answer» D. (A) and (B) above | |
| 19. |
The unit of diffusion coefficient is |
| A. | metre second |
| B. | Presence of cementite |
| C. | metre2 second-1 |
| D. | metre second-1 |
| E. | metre-2 second-1 |
| Answer» E. metre-2 second-1 | |
| 20. |
The upper range of mercury thermometer can be increased by |
| A. | Filling the stem with nitrogen under pressure |
| B. | Increasing tube diameter |
| C. | Taking into account expansion of tube |
| D. | Range cannot be increased |
| E. | Providing steel tube |
| Answer» A. Filling the stem with nitrogen under pressure | |
| 21. |
The depth of hardening is affected by |
| A. | Size of specimen |
| B. | Hardenability of steel |
| C. | Quenching medium |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. All of the above | |
| 22. |
Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be |
| A. | 7A |
| B. | 170 A |
| C. | 70 A |
| D. | 0.7 A |
| E. | 0.07 A |
| Answer» D. 0.7 A | |
| 23. |
During hardening soft spots can be avoided by |
| A. | using a more effective cooling medium |
| B. | protecting against decarburization in heating |
| C. | obtaining a more homogeneous structure employing annealing or normalising before hardening |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. Any of the above | |
| 24. |
Which of the following is high speed steel? |
| A. | T 55 Ni Cr 65 Mo 30 |
| B. | T 75 W 18 Co 6 Cr 4 |
| C. | T 10 Cr 5 Mo 75 V 23 |
| D. | T 75 W 18 Co 6 Cr 4 V 1 Mo 75 |
| E. | None of the above |
| Answer» D. T 75 W 18 Co 6 Cr 4 V 1 Mo 75 | |
| 25. |
Percentage of iron in pig iron approximately |
| A. | 95% |
| B. | 80% |
| C. | 90% |
| D. | 99.90% |
| E. | 78% |
| Answer» C. 90% | |
| 26. |
Silicon when added to copper increases its |
| A. | Brittleness |
| B. | Malleability |
| C. | Electrical conductivity |
| D. | Hardness |
| E. | Machinability |
| Answer» D. Hardness | |
| 27. |
Local hardening of steel can be done by all of the following EXCEPT |
| A. | flame hardening |
| B. | stepped uniform heating |
| C. | resistance heating |
| D. | Low specific heat of quenching oil |
| E. | induction hardening |
| Answer» A. flame hardening | |
| 28. |
Which of the following structure is least hard? |
| A. | Pearlite |
| B. | Presence of cementite |
| C. | Martensite |
| D. | Sorbite |
| E. | Troosite |
| Answer» A. Pearlite | |
| 29. |
Highest specific gravity is of |
| A. | Titanium |
| B. | Copper |
| C. | Lead |
| D. | Steel |
| E. | Brass |
| Answer» C. Lead | |
| 30. |
In which process steel is heated below the critical temperature |
| A. | Temperting |
| B. | Hardening |
| C. | Carburizing |
| D. | Annealing |
| E. | Normalizing |
| Answer» A. Temperting | |
| 31. |
Under identical values of cold and hot junction temperatures which thermocouple given the highest output |
| A. | Iron constantan |
| B. | All give equal output |
| C. | Nickel nimo |
| D. | Chromel-constantan |
| E. | Platinum-platinum-rhodium |
| Answer» D. Chromel-constantan | |
| 32. |
In tool steel the sulphur content is usually not allowed to exceed |
| A. | 3.5 percent |
| B. | 0.035 percent |
| C. | 5 percent |
| D. | 0.001 percent |
| E. | 0.35 percent |
| Answer» B. 0.035 percent | |
| 33. |
Which of the following material is not used for cyaniding? |
| A. | Sodium carbonate |
| B. | Sodium chloride |
| C. | Sodium hydroxide |
| D. | Sodium cyanide |
| E. | All of the above |
| Answer» C. Sodium hydroxide | |
| 34. |
The number of atoms per unit cell in BCC is |
| A. | 8 |
| B. | 9 |
| C. | 3 |
| D. | 6 |
| E. | 4 |
| Answer» B. 9 | |
| 35. |
As per IS code, C 65 steel will have carbon percentage of |
| A. | 0.065 percent |
| B. | 0.6 to 0.7 percent |
| C. | 6 to 7 percent |
| D. | 00 to 70 percent |
| E. | None of the above |
| Answer» B. 0.6 to 0.7 percent | |
| 36. |
Invar is an alloy of |
| A. | Iron and copper |
| B. | Iron and nickel |
| C. | Iron and chromium |
| D. | Iron and zinc |
| E. | Iron and vanadium |
| Answer» B. Iron and nickel | |
| 37. |
Which of the following can be used as fuel in open hearth furnace? |
| A. | Liquid fuels |
| B. | Coke oven gas |
| C. | Producer gas |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. Any of the above | |
| 38. |
Which of the following furnaces is not used for non-ferrous materials |
| A. | Gas fired tilting furnace |
| B. | Pit furnace |
| C. | Cupola |
| D. | Crucible furnace |
| E. | Oil fired tilting furnace |
| Answer» C. Cupola | |
| 39. |
In order to observe the grain size of steel samples under microscope, the magnification should be the order of |
| A. | 2 |
| B. | 20 |
| C. | 1500 |
| D. | 100 |
| E. | 10 |
| Answer» D. 100 | |
| 40. |
For each ton of pig iron produced from blast furnace, the lime stone used is approximately |
| A. | 0.01 ton |
| B. | 0.4 tom |
| C. | 0.1 ton |
| D. | 1.4 ton |
| E. | 2.55 tons |
| Answer» B. 0.4 tom | |
| 41. |
Chilling, heat treatment and alloy addition to cast iron generally |
| A. | reduces machinability |
| B. | reduces carbon percentage |
| C. | reduces wear resistance |
| D. | improves machinability |
| E. | None of the above |
| Answer» A. reduces machinability | |
| 42. |
Manganese is added to steel primarily to increase |
| A. | Malleability |
| B. | Ductility |
| C. | Fatigue strength |
| D. | Endurance limit |
| E. | Tensile strength |
| Answer» E. Tensile strength | |
| 43. |
Just as strong is opposite of weak likewise elastic is opposite of |
| A. | Rigid |
| B. | Soft |
| C. | Ductile |
| D. | Inelastic |
| E. | Hard |
| Answer» A. Rigid | |
| 44. |
Which of the following temperatures represents the tempering temperature for C 30 steel? |
| A. | 1700?C |
| B. | 100-150?C |
| C. | 1400-1450?C |
| D. | 550-660?C |
| E. | 860-890?C |
| Answer» C. 1400-1450?C | |
| 45. |
Which thermocouple can measure the highest temperature? |
| A. | Tungsten- molybdenum |
| B. | Copper-constantan |
| C. | Chromel-alumel |
| D. | Iron constantan |
| E. | Platinum-rhodium |
| Answer» A. Tungsten- molybdenum | |
| 46. |
Which of the following is the softest material? |
| A. | Corundum |
| B. | Fluorite |
| C. | Diamond |
| D. | Quartz |
| E. | Calcite |
| Answer» E. Calcite | |
| 47. |
Which allotropic form of iron does not have body centred cubic lattice? |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» C. Gamma iron | |
| 48. |
All of the following are magnetic materials EXCEPT |
| A. | Cast iron |
| B. | Zinc |
| C. | Nickel |
| D. | Cobalt |
| E. | Iron |
| Answer» B. Zinc | |
| 49. |
Machinability of metal depends on |
| A. | Hardness |
| B. | Hardness and tensile strength |
| C. | Brittleness |
| D. | Brittleness and toughness |
| E. | None of the above |
| Answer» B. Hardness and tensile strength | |
| 50. |
Which of the following is not a constituent of Stellite? |
| A. | Cobalt |
| B. | Tungsten |
| C. | Ferrous |
| D. | Chromium |
| E. | All of the above |
| Answer» C. Ferrous | |
| 51. |
Which of the following metal has face centred cubic structure? |
| A. | Tin |
| B. | Gold |
| C. | Magnesium |
| D. | Zinc |
| E. | Cadmium |
| Answer» B. Gold | |
| 52. |
Which colour of flame represents the highest temperature? |
| A. | Dark red |
| B. | Pink |
| C. | White |
| D. | Light yellow |
| E. | Bright red |
| Answer» C. White | |
| 53. |
Which of the following metal does not have face centred cubic structure? |
| A. | Nickel |
| B. | Tin |
| C. | Lead |
| D. | Copper |
| E. | Silver |
| Answer» B. Tin | |
| 54. |
The rollers of a cycle chain are subjected to |
| A. | Shear stress |
| B. | Tensile stress |
| C. | Creep stress |
| D. | Fatigue stress |
| E. | Compressive stress |
| Answer» D. Fatigue stress | |
| 55. |
The maximum temperature inside a blast furnace gas is of the order of |
| A. | 2600?C |
| B. | 1000?C |
| C. | 1600?C |
| D. | 50?C |
| E. | 3600?C |
| Answer» C. 1600?C | |
| 56. |
If an article develops insufficient hardening after quenching it could be due to any of the following EXCEPT |
| A. | Internal stresses in the article before heating |
| B. | Low specific heat of quenching oil |
| C. | Cooling rate too slow |
| D. | Holding insufficient at the hardening temperature |
| E. | Hardening temperature too low |
| Answer» A. Internal stresses in the article before heating | |
| 57. |
Which of the following is the hardest? |
| A. | Fluorite |
| B. | topaz |
| C. | Quartz |
| D. | Corundum |
| E. | Talc |
| Answer» D. Corundum | |
| 58. |
The allotropic form of iron not having body centred cubic lattice is |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» D. Delta iron | |
| 59. |
Dilute nitric acid applied to a clean fracture of wrought iron gives |
| A. | Grey stain |
| B. | Greenish stain |
| C. | White stain |
| D. | Blue stain |
| E. | Black stain |
| Answer» C. White stain | |
| 60. |
Railway rails are made of |
| A. | Mild steel |
| B. | Low carbon steel |
| C. | Medium carbon steel |
| D. | Dead muld steel |
| E. | High carbon steel |
| Answer» E. High carbon steel | |
| 61. |
High ductility wires are made on |
| A. | Wrought iron |
| B. | Medium carbon steel |
| C. | Cast iron |
| D. | Dead mild steel |
| E. | High carbon steel |
| Answer» D. Dead mild steel | |
| 62. |
The highest percentage of chrommium that can be added to steel is usually |
| A. | 18 percent |
| B. | 25 percent |
| C. | 15 percent |
| D. | 50 percent |
| E. | 12 percent |
| Answer» A. 18 percent | |
| 63. |
Eutectoid steel has a structure of |
| A. | Martensite |
| B. | Bainite |
| C. | Sorbite |
| D. | Nickel |
| E. | A combination of all above |
| Answer» D. Nickel | |
| 64. |
The flux used in blast furnace while melting iron ore is |
| A. | Bauxite |
| B. | Carbon |
| C. | Oxygen |
| D. | Sodium chloride |
| E. | Lime stone |
| Answer» E. Lime stone | |
| 65. |
Galvanising layer usually provides protection in the range of water |
| A. | 7 to 14 |
| B. | Complete protection is provided |
| C. | 1 to 7 |
| D. | 1 to 14 |
| E. | 6 to 11 |
| Answer» E. 6 to 11 | |
| 66. |
Ferrite is |
| A. | Low specific heat of quenching oil |
| B. | Present in abundance in high carbon steel |
| C. | Soft and ductile |
| D. | Hardenable under rapid cooling |
| E. | Amorphous and brittle |
| Answer» C. Soft and ductile | |
| 67. |
If a sample of steel shows unsymmetrical deformation of a piece in quenching, the probable cause could be |
| A. | Impure quenching oil |
| B. | Low specific heat of quenching oil |
| C. | Excessive proportion of alloying elements |
| D. | Non-uniform heating or cooling |
| E. | Low temperature during heating |
| Answer» D. Non-uniform heating or cooling | |
| 68. |
Attack of steel is increased by |
| A. | Salt solution below a paint coat |
| B. | Invisible moisture film present prior to painting |
| C. | Graphite in the priming coat |
| D. | Loose rust and partially removed mill scale |
| E. | All of the above |
| Answer» E. All of the above | |
| 69. |
Which allotropic form of iron is magnetic at room temperature? |
| A. | Alpha iron |
| B. | Beta iron |
| C. | Gamma iron |
| D. | Delta iron |
| E. | All of the above |
| Answer» A. Alpha iron | |
| 70. |
Persence of lead in brass improves |
| A. | Malleability |
| B. | Hardenability |
| C. | Ductility |
| D. | Fatigue resistance |
| E. | Machining properties |
| Answer» E. Machining properties | |
| 71. |
Which of the following is a noble metal? |
| A. | Aluminium |
| B. | Chromium |
| C. | Stainless steel |
| D. | Nickel |
| E. | Platinum |
| Answer» E. Platinum | |
| 72. |
Which of the following form of iron is produced as a result of annealing of white cast iron? |
| A. | Wrought iron |
| B. | Spheroidal iron |
| C. | Nodular iron |
| D. | Malleable iron |
| E. | Grey iron |
| Answer» D. Malleable iron | |
| 73. |
Which colour of heat represents the highest temperature? |
| A. | Low specific heat of quenching oil |
| B. | White |
| C. | Salmon |
| D. | Dry cherry |
| E. | Blood red |
| Answer» B. White | |
| 74. |
Nickel is |
| A. | Ferromagnetic |
| B. | Ferroelectric |
| C. | Dielectric |
| D. | Paramagnetic |
| E. | None of the above |
| Answer» A. Ferromagnetic | |
| 75. |
The tensile strength of nodular iron may be of the order of |
| A. | 500 kg/cm2 |
| B. | 100 kg/cm2 |
| C. | 1000 kg/cm2 |
| D. | 2000 kg/cm2 |
| E. | 4000 kg/cm2 |
| Answer» E. 4000 kg/cm2 | |
| 76. |
During heat treatment, deformation and volume changes can be minimised by |
| A. | slowly cooling in the martensitic range |
| B. | using surface hardening when possible |
| C. | using alloy steels least prone to such changes |
| D. | Any of the above |
| E. | Low specific heat of quenching oil |
| Answer» D. Any of the above | |
| 77. |
Spherical metal powders are usually produced by |
| A. | Milling |
| B. | Electrolytic process |
| C. | Oxidation |
| D. | Automization |
| E. | Reduction |
| Answer» D. Automization | |
| 78. |
In Brinell hardness testing the timer for loading is |
| A. | 15 seconds |
| B. | 1 second |
| C. | 5 seconds |
| D. | 1 minute |
| E. | 2 seconds |
| Answer» A. 15 seconds | |
| 79. |
The stainless steels owe their resistance to corrosion to the presence of |
| A. | Chromium |
| B. | Carbon |
| C. | Sulphur |
| D. | Manganese |
| E. | Nickel |
| Answer» A. Chromium | |
| 80. |
The effect of austenitic grain size development during heat treatment is |
| A. | lower hardenability |
| B. | greater toughness |
| C. | lower internal stress |
| D. | All of the above |
| E. | Low specific heat of quenching oil |
| Answer» B. greater toughness | |
| 81. |
Warping may be avoided when quenching a long slender piece of work by |
| A. | Holding the work piece between clamps and pouring water on it |
| B. | Hoding the work piece vertically over the quenching bath and plunging it straight |
| C. | Pulling the piece from both ends |
| D. | Holding the piece horizontally in adequate supports |
| E. | None of the above |
| Answer» B. Hoding the work piece vertically over the quenching bath and plunging it straight | |
| 82. |
Which of the following is not a hardening process? |
| A. | Nitriding |
| B. | Carburising |
| C. | Cyaniding |
| D. | Sphcroidizing |
| E. | Induction hardening |
| Answer» D. Sphcroidizing | |
| 83. |
The maximum percentage of carbon in austenite is |
| A. | 2% |
| B. | 2.70% |
| C. | 1.70% |
| D. | 0.07% |
| E. | 0.70% |
| Answer» C. 1.70% | |
| 84. |
Nichrome contains |
| A. | Nickel, lead and zinc |
| B. | Nickel and copper |
| C. | Nickel and chromium |
| D. | Nickel, copper and vanadium |
| E. | Nickel, chromium and vanadium |
| Answer» C. Nickel and chromium | |
| 85. |
Free cutting steels usually have sulphur content of |
| A. | 0.02 percent |
| B. | 0.21 percent |
| C. | 2 percent |
| D. | 10 percent |
| E. | 0.002 percent |
| Answer» B. 0.21 percent | |
| 86. |
Fusible plug for boilers consists of |
| A. | Zinc, bismuth and tin |
| B. | Lead, tin and mercury |
| C. | Copper, lead and tin |
| D. | Bismuth, lead and tin |
| E. | Zinc, copper and lead |
| Answer» D. Bismuth, lead and tin | |
| 87. |
Stellite contains |
| A. | Nickel, zinc and aluminium |
| B. | Nickel, copper and zinc |
| C. | Cobalt, chromium and tungsten |
| D. | Copper, tin and lead |
| E. | Cobalt, vanadium and nickel |
| Answer» C. Cobalt, chromium and tungsten | |
| 88. |
For producing cast iron pipes by centrifugal casting method the core used is |
| A. | Wax core |
| B. | Clay core |
| C. | Metallic core |
| D. | Sand core |
| E. | No core is used |
| Answer» E. No core is used | |
| 89. |
Mild steel has the structure of |
| A. | BCC |
| B. | Cubic |
| C. | FCC |
| D. | HCC |
| E. | Orthorhombic |
| Answer» A. BCC | |
| 90. |
Which of the following furnace is used to convert liquid pig iron into steel? |
| A. | Open hearth furnace |
| B. | Cupola |
| C. | Converter |
| D. | Induction arc furnace |
| E. | Low specific heat of quenching oil |
| Answer» C. Converter | |
| 91. |
Lowest melting point may be expected for |
| A. | Brass |
| B. | Lead |
| C. | Zirconium |
| D. | Copper |
| E. | Aluminium |
| Answer» B. Lead | |
| 92. |
Which of the following is easiest to bend? |
| A. | Grey pig iron |
| B. | Wrought iron |
| C. | Mottled pig iron |
| D. | Cast iron |
| E. | Steel |
| Answer» B. Wrought iron | |
| 93. |
Dilute nitric acid applied to a clean fracture of white cast iron will produce |
| A. | Grey stain |
| B. | Black stain |
| C. | Pink stain |
| D. | White stain |
| E. | Brown stain |
| Answer» E. Brown stain | |
| 94. |
Plasticisers are added to plastic compounds to |
| A. | Improve resistance to acids |
| B. | Provide a protective layer |
| C. | Improve resistance to alkalies |
| D. | Increase tensile strength |
| E. | Improve softness and flexibility |
| Answer» E. Improve softness and flexibility | |
| 95. |
The process of providing zinc coating on steel pipes is known as |
| A. | Cold working |
| B. | Pickling |
| C. | Galvanising |
| D. | Blistering |
| E. | Spheroidising |
| Answer» C. Galvanising | |
| 96. |
Th phenomenon of emf development between two diferent metals placed in contact is known as |
| A. | Kelvin effect |
| B. | Thomson effect |
| C. | Seeback effect |
| D. | Peltier effect |
| E. | Thermocouple effect |
| Answer» C. Seeback effect | |
| 97. |
Hardening by carburizing is limited to |
| A. | 2 mm |
| B. | 5 mm |
| C. | 0.05 mm |
| D. | Low specific heat of quenching oil |
| E. | 0.1 mm |
| Answer» A. 2 mm | |
| 98. |
Which of the following is by product from blast furnace? |
| A. | Slag |
| B. | Flue dust |
| C. | Blast furnace gas |
| D. | All of the above |
| E. | None of the above |
| Answer» D. All of the above | |
| 99. |
Which of the following is not true in case of white cast iron |
| A. | It is strong |
| B. | It is brittle |
| C. | It is malleable |
| D. | It is whitish in colour |
| E. | It is hard |
| Answer» C. It is malleable | |
| 100. |
Which iron ore has least percentage of iron |
| A. | Magnetite |
| B. | Limonite |
| C. | All have almost equal percentage of iron ore |
| D. | Siderite |
| E. | Hematite |
| Answer» D. Siderite | |
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