141. Structural steel contains following principal alloying elements
A.Nickel, chromium and manganese
B.Tungsten, molybdenum and phosphorous
C.Lead, tin, aluminium
D.Zinc, sulphur, and chromium

---

142. Aluminium bronze contains aluminium and copper in the ratio of
A.50 : 50
B.40 : 60
C.60 : 40
D.10 : 90

---

143. Bronze contains
A.70% copper and 30% zinc
B.90% copper and 10% tin
C.85-92% copper and rest tin with little lead and nickel
D.70-75% copper and rest tin

---

144. Muntz metal contains copper and zinc in the ratio of
A.50 : 50
B.40 : 60
C.60 : 40
D.20 : 80

---

145. Gun metal contains
A.70% copper and 30% zinc
B.90% copper and 10% tin
C.85-92% copper and rest tin with little lead and nickel
D.70-78% copper and rest tin

---

146. Perminvar alloy having constant permeability is an alloy of
A.Nickel, copper and iron
B.Nickel, copper and zinc
C.Copper, nickel and antimony
D.Iron, zinc and bismuth

---

147. The alloy used for making electrical resistances and heating elements is
A.Nichrome
B.Invar
C.Magnin
D.Elinvar

---