1954. __________ does not contain copper as an alloying element,
Nichrome
Manganin
Perminivar
Monel metal
✅ The correct answer is option A.
1957. Which of the following heat treatment processes is used for softening the hardened material?
Normalising
Tempering
Annealing
None of these
✅ The correct answer is option B.
1959. A material capable of undergoing large permanent deformation, when subjected to compression is termed as
Malleable
Ductile
Brittle
None of these
✅ The correct answer is option A.
1961. The softest material in Mho’s scale (for measuring hardness) is
Talc
Gypsum
Rubber
None of these
✅ The correct answer is option A.
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.
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.
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.
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.
1971. __________ is used for examining the macro-structure of a material.
Metallurgical microscope
Optical microscope
X-rays
Visual inspection by naked eye
✅ The correct answer is option D.
1973. Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of
Concrete
Steel
Zircalloy
Graphite
✅ The correct answer is option B.