491. Very high sulphur in pig iron makes ___________________?
A. Its casting unsound
B. Its hard and machinable
C. Its brittle and malleable
D. All A., B. & C.

492. The material of construction of bearings is__________________?
A. Cast iron
B. Babbitt metal
C. Pig iron
D. Steel

493. Duriron is__________________?
A. Acid resistant, brittle and very hard
B. High silicon iron
C. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal
expansion
D. All A., B. and C.

494. Biological shield in a nuclear power reactor is made of________________?
A. Concrete
B. Steel
C. Cadmium
D. Zircaloy

495. Combination of metals and ceramics are called___________________?
A. Metalloy
B. Cermets
C. Pellets
D. Non-crystalline ceramics

496. Dry chlorine can be handled in a vessel made of__________________?
A. Iron or steel
B. PVC
C. Nickel
D. Brass

497. Vycor, a widely used material for making ‘thermal wells’ in temperature measurement, is a_______________?
A. Cermet
B. Glass
C. Thermosetting plastic
D. Metallic alloy

498. Galvanising is generally done on___________________?
A. Non-ferrous metals
B. Low carbon steel
C. Stainless steel
D. Cast iron

499. Wrought iron is a suitable material of construction for handling _____________ solutions?
A. Dilute acidic
B. Concentrated acidic
C. Alkalis & alkaline
D. None of these

500. Anodic material used for the cathodic protection of underground buried steel pipeline is_________________?
A. Nickel or copper
B. Zinc or magnesium
C. Bronze
D. Brass

NOTE
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