1) Alpha iron is stable ______________ °C? a. Above 1403 b. Upto 910 c. Above 1800 d. Between 910 & 1403
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2) The softest material in Mho’s scale (for measuring hardness) is________________? a. Talc b. Gypsum c. Rubber d. None of these
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3) Cold work tool steel should have_________________? a. High toughness b. Poor hardenability c. High wear resistance d. All A., B. & C.
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4) Zircaloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium_______________? a. Tin, nickel, iron and chromium b. And graphite c. And copper d. None of these
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5) An alloy of iron containing 4% carbon is called________________? a. High carbon steel b. Wrought iron c. Mild steel d. None of these
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6) _____________ is used for examining the macro-structure of a material? a. Metallurgical microscope b. Optical microscope c. X-rays d. Visual inspection by naked eye
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7) Acetaldehyde is shipped in ____________ drums? a. Cast iron b. Steel c. Aluminium d. Either B. & C.
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8) Rotary driers are generally made of_______________? a. Cast iron b. Mild steel c. High silicon iron (14% Si) d. Tin lined with refractory bricks
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9) Fatigue failure of a material may occur, when it is subjected to _____________ stress? a. Fluctuating b. Tensile c. Compressive d. Torsion
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10) Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property ? a. Silicon b. Phosphorus c. Sulphur d. None of these
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11) Ball bearings are generally made of___________________? a. Plain carbon steel b. Chrome carbon steel c. Stainless steel d. Malleable cast iron
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12) Hardest materials so far found is_________________? a. Diamond b. Graphite c. Carborundum d. Pumice stone
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13) The presence of impurities in iron_________________? a. Increases its melting point b. Does not affect its melting point c. Decreases its melting point d. Makes it malleable
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14) Molybdenum steels containing 0.15 to 0.40% molybdenum___________________? a. Are prone to temper brittleness b. Are used for automobile parts like gears, axle, shaft, bearings etc. c. Have very poor fatigue resistance d. Do not contain nickel or chromium or both
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15) Carbon is present in the uncombined (graphitic) form in case of__________________? a. Cast iron b. Steel c. Ferroalloy d. None of these
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16) Nickel and molybdenum are the basic constituents of___________________? a. Hastelloy b. German silver c. Inconel d. Solder
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17)
Constantan used in thermocouples is an alloy of___________________? a. Iron & copper b. Copper & aluminium c. Lead & tin d. None of these
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18) Tempering of steel is done to make it_________________? a. Brittle b. Hard c. Rollable d. Soft
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19) Hydrochloric acid absorber in made of___________________? a. Cast iron b. Mild steel c. Karbate d. Stainless steel
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20) Most suitable material for high pressure vessel operating at 500 atm. and 500° C is__________________? a. Molybdenum stainless steel b. 18/8 stainless steel c. Mild steel d. High silicon iron (14% Si)
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21) Metalloid is__________________? a. Highly electronegative in nature b. An element which exhibits the properties of both metal & non-metal c. An alloy d. All A., B. and C.
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22) The ability of a material to offer resistance to scratching or indentation is a measure of its_________________? a. Brittleness b. Toughness c. Hardness d. Resilience
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23) In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of _______________? a. Concrete b. Wood c. Steel d. Porcelain
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24) A magnetic material becomes ____________ above the Curie temperature? a. Ferromagnetic b. Diamagnetic c. Paramagnetic d. None of these
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25) Common house hold glass (i.e., soda-lime glass) is a/an _____________ material? a. Fully crystalline b. Partly crystalline c. Amorphous d. None of these
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26) Carbon content in plain carbon steel is ______________ percent? a. 0.1 to 0.15 b. 0.35 to 0.45 c. 0.65 to 0.80 d. 0.85 to 1.2
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27) For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is__________________? a. Stainless steel b. Cast iron c. Aluminium d. Nickel
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28) Coke oven walls are lined with _____________ bricks? a. Silica b. Tar-dolomite c. Low thermal conductivity d. Fire clay
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29) Pick out the wrong statement? a. Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure b. Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal l c. Tungsten has a body centred cubic (bcc) crystal lattice structure d. Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure
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30) Metal at the top of the electromotive series is________________? a. Least active b. Most stable c. Most active d. Most noble
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