A. Lead
B. Zinc
C. Aluminium
D. Copper
Related Mcqs:
- In “Imperial Smelting Process” for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _______________________?
A. Jet of water at high pressure
B. Blast of air
C. Mixture of water and air
D. Rain of molten lead - Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of_____________________?
A. 90% tungsten carbide and 10% cobalt
B. 70% aluminium oxide & 30% silica
C. 30% nickel, 15% chromium & 55% tungsten
D. 65% tungsten & 35% zirconium - Titanium is added to molten aluminium alloys before casting for the purpose of_____________________?
A. Grain refinement
B. Increasing corrosion resistance
C. Reducing porosity
D. Improving fluidity - Enzymes belong to the category of_____________________?
A. Proteins
B. Carbohydrates
C. Vitamins
D. Fats - ____________________ flux is used for the extraction of metal from its self fluxing ores?
A. No
B. Acid
C. Basic
D. Neutral - The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the _____________ of the slag ?
A. Fluidity
B. Basicity
C. Acidity
D. Viscosity - Which of the following is an undesirable property of slag produced during the Pyrometallurgical method of metal extraction from its ore ?
A. High fusibility & fluidity
B. High thermal conductivity
C. Low density
D. High chemical activity - Electrometallurgical methods of metal extraction is normally used for those metals___________________?
A. Whose oxide/ore is not reduced by carbon
B. Which fall in the category of alkali & alkaline earth metals
C. Which stands higher in the electrochemical series of the metal
D. All A, B. & C. - Electrometallurgy is not involved in the extraction of ___________________ from its ore?
A. Aluminium
B. Tin
C. Lead
D. Both B. & C. - Plastics as a material of construction suffer from the drawback of low_________________?
A. Machinability
B. Density
C. Strength
D. Plastic deformation
