- (A) body centred cubic
- (B) face centred cubic
- (C) hexagonal close packed
- (D) cubic structure
- (E) orthorhombic crystal
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- (A) molecular change
- (B) physical change
- (C) allotropic change
- (D) solidus change
- (E) atomic change
- (A) below 723°C
- (B) 770 – 910°C
- (C) 910-1440°C
- (D) 1400-1539°C
- (E) above 1539°C
- (A) 770°C
- (B) 910°C
- (C) 1050°C
- (D) below recrystallisation temperature
- (E) above recrystallization temperature
- (A) austenite
- (B) pearlite
- (C) ferrite
- (D) cementlte
- (E) bainite
- (A) has a fixed structure under all conditions
- (B) exists in several crystal forms at different temperatures
- (C) responds to heat treatment
- (D) has its atoms distributed in a random pattern
- (E) none of the above
- (A) stages at which allotropic forms change
- (B) stages at which further heating does not increase temperature for some time
- (C) stages at which properties do not change with increase in temperature
- (D) there is nothing like points of arrest
- (E) none of the above
- (A) malleable iron
- (B) nodular iron
- (C) spheroidal iron
- (D) grey iron
- (E) none of the above
- (A) 80% or more iron
- (B) 50% or more iron
- (C) alloying elements like chromium, tungsten nickel and copper
- (D) elements like phosphorus, sulphur and silicon in varying quantities
- (E) high quantities of sulphur
- (A) tenacity
- (B) brittleness
- (C) plasticity
- (D) corrosion resistance
- (E) hardness
