Duralumin contains

A. 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium

B. 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium

C. 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium

D. 5 to 6% tin, 2 to 3% copper and rest aluminium

Answer: Option A

Solution(By Examveda Team)

In addition to aluminium, the main materials in duralumin are copper, manganese and magnesium. For instance, Duraluminium 2024 consists of 91-95% aluminium, 3.8-4.9% copper, 0.3-0.9% manganese, 1.2-1.8% magnesium, <0.5% iron, <0.5% silicon, <.0.25% zinc, <0.15% titanium, <0.10% chromium and no more than 0.15% of other elements together.