Which of the following statement(s) is/are correct? P. Bell metal consists of Cu, Sn and little Zn. Q. Wood metal is used in the making of automatic sprinkles. R. Duralumin is used in the manufacturing of aeroplane parts and consists of Al, Cu, Mg and Mn.

Bell metal is an alloy and consists of Cu = 80%, Sn = 20%. Wood metal consists of Bi = 50%, Pb = 25%, Sn = 12.5% & Cd = 12.5% and is used in the making of automatic sprinkles as it melts in hot water (m.p.= 68 oC). Duralumin is used in the manufacturing of aeroplane parts and consists of Al = 95.5%, Cu = 4%, Mg = 0.5% and Mn = 0.5%.