Talc
Gypsum
Rubber
None of these
✅ The correct answer is option A.
Engineering
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1962. Light weight metallic alloy used in aircraft industry is
Aluminium
High silicon (14%) iron
Duralumin
Phosphor bronze
✅ The correct answer is option C.
1963. Kel-F is a material, which is
Chemically known as polychlorotrifluor-oethylene (PTFE)
Having excellent chemical & high temperature resistance (upto 200°C)
Having elastomeric properties
All of the above
✅ The correct answer is option D.
1964. Hot working of lead is carried out at
75° C
373° K
150° C
Room temperature
✅ The correct answer is option D.
1965. Which one occupies the lowermost position in the electromotive series of metals?
Aluminium
Noble metals (Ag, Pt, Au)
Zinc
Alkali metals (K, Na, Li)
✅ The correct answer is option B.
1966. The carbonating tower used in Solvay process of soda ash manufacture is made of
Cast iron
Stainless steel
Karbate
Lead lined steel
✅ The correct answer is option A.
1967. Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
Acidic refractory
Rubber
Karbate
Lead or acid-proof bricks
✅ The correct answer is option D.
1968. Vycor, a widely used material for making ‘thermal wells’ in temperature measurement, is a
Cermet
Glass
Thermosetting plastic
Metallic alloy
✅ The correct answer is option B.
1969. Sheardising process is used for
Surface coating
Heat treatment of high speed steel
Cold working on metals
None of these
✅ The correct answer is option A.
1970. The temperature at which new grains are formed in the metal is called the __________ temperature.
Eutectic
Recrystallisation
Upper critical
Lower critical
✅ The correct answer is option B.