A. in a random manner
B. in a haphazard way
C. in circular motion
D. back and forth like tiny pendulums
E. do not move
A. 770°C
B. 910°C
C. 1440°C
D. 1539°C
E. none of the above
A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
A. body centred cubic
B. face centred cubic
C. hexagonal close packed
D. cubic structure
E. orthorhombic crystal
A. 0.1 to 1.2%
B. 1.5 to 2.5%
C. 2.5 to 4%
D. 4 to 4.5%
E. 4.5 to 6.3%.
A. raw material for blast furnace
B. product of blast furnace made by reduction of iron ore
C. iron containing huge quantities of carbon
D. iron in molten form in the ladles
E. iron scrap
A. cementite
B. free carbon
C. flakes
D. spheroids
E. nodular aggregates of graphite
A. hard
B. high in strength
C. highly resistant to corrosion
D. heat treated to change its properties
E. least resistant to corrosion
A. It contains carbon of the order of 0 to 0.25%
B. It melts at 1535°C
C. It is very soft and ductile
D. It can be easily forge welded
E. It is made by adding suitable percent¬age of carbon to molten iron and subjecting the product to repeated hammering and rolling
A. allotropic change
B. recrystallisation
C. heat treatment
D. precipitation
E. austempering