A) alloying with cobalt B) increasing carbon percentage C) reducing carbon percentage D) purifying it. Ans : (A)
A) Silver & Copper B) Silver, Copper & Zinc C) Silver & Gold D) Nickel, Copper & Zinc. Ans : (D)
A) gold leaf electroscope B) radioactive emanations C) X-rays D) heat. Ans : (A)
A) reduces the saturation magnetization B) reduces the hysteresis loss C) increases the electrical resistivity of iron D) none of the above. Ans : (B)
A) Fe2C B) FeC2 C) Fe3C D) Fe3C2. Ans : (C)
A) iron-dust B) small particles of iron C) silicon-iron D) ferric-oxide. Ans : (D)
A) 81% Cu + 2% Zn + 10% Sn B) 86% Cu + 9% Zn + 5% Sn C) 84% Cu + 15% Zn + 1% Sn D) 80% Cu + 15% Zn + 5% Sn. Ans : (A)
A) Copper and zinc B) Copper & aluminium C) Copper and nickel D) Copper and lead. Ans : (C)
A) magneto-calorization B) magnetostriction C) magnetic expansion D) magnetic hysteresis. Ans : (B)
A) depends on method of heating B) decreases with increasing temperature C) increases with increasing temperature D) is independent of temperature. Ans : (B)