211. Aluminium has low density and addition of silicon improves its fluidity and therefore, its castability.
Correct
Incorrect
✅ The correct answer is option A.
Engineering Materials MCQs
212. The percentage of phosphorus is phosphor bronze is
0.1
1
11.1
98
✅ The correct answer is option A.
213. In iron, the presence of carbon in free form is called graphite.
Agree
Disagree
✅ The correct answer is option A.
214. Manganese is added in low carbon steel to
make the steel tougher and harder
raise the yield point
make the steel ductile and of good bending qualities
all of the above
✅ The correct answer is option C.
215. Grey cast iron is __________ than white cast iron.
softer
harder
✅ The correct answer is option A.
216. The property of a material which enables it to retain the deformation permanently, is called
brittleness
ductility
malleability
plasticity
✅ The correct answer is option D.
217. The coordination number of a face centred cubic space lattice is
six
twelve
eighteen
twenty
✅ The correct answer is option B.
218. The slag from the blast furnace
is used as a ballast for rail road
is mixed with tar for road making
consists of calcium, aluminium and ferrous silicates
all of the above
✅ The correct answer is option D.
219. In a close packed hexagonal space lattice, there are
nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre
twelve atoms, all of which are located at the twelve corners of a hexagonal prism
fourteen atoms out of which eight atoms are located at the coners of the cube and six atoms at the centres of six faces
none of the above
✅ The correct answer is option D.
220. The fuel used in a blast furnace is
coal
coke
wood
producer gas
✅ The correct answer is option B.