1890. Mild steel is a/an __________ steel.
Low carbon
Medium carbon
High carbon
High alloy
✅ The correct answer is option A.
1892. The hardest material just prior to diamond in Mho’s scale is
Topax
Carborundum
Corrundum
Calcite
✅ The correct answer is option C.
1894. Super conductors are those substances, which
Offer no resistance to current flow
Conduct electricity at low temperature
Offer high resistance to current flow
Conduct electricity at high temperature
✅ The correct answer is option A.
1896. Silicone rubber is not resistant to the corrosive action of
Sulphuric acid (10%)
Sulphuric acid (95%)
Ether
Both B and C
✅ The correct answer is option D.
1898. When iron is rusted, it is
Converted to a fine powder
Reduced
Oxidised
None of these
✅ The correct answer is option C.
1900. Shock resisting steels should possess high
Hardness
Toughness
Tensile strength
Wear resistance
✅ The correct answer is option B.
1902. Duriron is
Acid resistant, brittle and very hard
High silicon iron
Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
All of the above
✅ The correct answer is option D.
1904. An ideal material of construction for the storage of 50% caustic soda solution would be
Karbate
High silicon cast iron
Monel
None of these
✅ The correct answer is option C.
1907. Mild steel is used for making
Fish plates
Die block
Channels
Drop forging
✅ The correct answer is option C.
1910. Atmospheric corrosion of metals result from their
Slow oxidation
Fast oxidation
Fast hydration
Slow dehydration
✅ The correct answer is option A.