Hardened steel is softened by___________________?
Hardened steel is softened by___________________? A. NormalisingB. Tempering C. Annealing D. Carburising
Hardened steel is softened by___________________? A. NormalisingB. Tempering C. Annealing D. Carburising
The ‘bomb’ in the bomb calorimeter is made of___________________? A. Molybdenum stainless steel B. Mild steel C. High silicon iron (14% Si) D. Copper
_____________________ is used for determining the tensile strength of steels ? A. Hydraulic pressB. Universal testing machine C. Mechanical press D. None of these
For storing water and acid free benzol, use a ______________ vessel? A. Steel B. Karbate C. Stainless steel D. None of these
Gas holder of a gobar (cow-dung) gas plant is made of___________________? A. Molybdenum stainless steel B. TinC. Mild steel D. Aluminium
Copper is dissolved from its ore by H2SO4 in a percolation tank made of_________________? A. Wood B. Stainless steelC. Reinforced concrete lined with lead D. High silicon iron (14% Si)
Addition of ______________ in steel is helpful in increasing the depth of hardness? A. Chromium B. Sulphur C. Vanadium D. Tungsten
Addition of nickel to copper improves its_________________? A. Machinability B. Ductility C. StrengthD. Hardness
Clock pendulums are usually made of _______________ steel? A. High speed B. Stainless C. Heat resistingD. None of these
A chemical change takes place when iron_____________? A. Rusts B. Melts C. Is heated D. None of these