Question

Copper is not present as an alloying constituent in:

• A. Nichrome
• B. Delta metal
• C. Silicone bronze
• D. Constantan

Hint:

Nichrome is a heat-resistant alloy used in heating elements. It is made of Nickel and Chromium — not copper.

Answer 1

The Correct Option is A

Step 1: Composition of Each Alloy - Nichrome is an alloy of Nickel (Ni) and Chromium (Cr). It typically contains: - 80% Nickel, - 20% Chromium, - No copper content. - Delta Metal: A type of brass (an alloy of Copper and Zinc), also includes a small percentage of iron. - Silicon Bronze: A bronze alloy containing Copper, Silicon, and sometimes Zinc. - Constantan: An alloy of Copper (55%) and Nickel (45%). Step 2: Elimination Copper is a constituent in options (B), (C), and (D), but not in Nichrome (A). Conclusion: The correct answer is Nichrome, as it contains no copper.