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Which is the most widely used metal for castings?
کاسٹنگ کے لئے سب سے زیادہ استعمال ہونے والی دھات کون سی ہے؟
  1. Cast iron
  2. Aluminum
  3. Brass
  4. Magnesium alloys
Explanation

Cast iron has excellent fluidity, allowing it to fill moulds easily.

It is economical and widely used for machine parts, pipes, and engine blocks.

Cast iron is the most commonly used metal for casting.

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In_____, diffusion current is measured as a function of scanning potential difference.
ذیل میں سے کس عمل میں ڈفیوژن کرنٹ کو سکین کرنا ممکنہ فرق کے ساتھ ناپا جاتا ہے؟
  1. Chromatography
  2. Potentiometric
  3. Voltammetry
  4. Amperometry
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Which combination will produce a precipitate?
مندرجہ ذیل میں سے کون سا امتزاج پریسیپیٹیٹ بنائے گا؟
  1. NH₄OH (aq) and HCl (aq)
  2. AgNO₃ (aq) and Ca(C₂H₃O₂)₂ (aq)
  3. NaOH (aq) and Fe(NO₃)₃ (aq)
  4. NaCl (aq) and HC₂H₃O₂ (aq)
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Based on the equations below, which metal is the most active: Pb(NO₃)₂ (aq) + Ni (s) → Ni(NO₃)₂ (aq) + Pb (s), Pb(NO₃)₂ (aq) + Ag (s) → No reaction Cu(NO₃)₂ (aq) + Ag (s) → No reaction?
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Which of the following statements is not true about precision of data? It is the variability among replicate measurements, Low standard deviation within measurements mean good precision, It reflects how close the values in a series of results are to each other, It is the difference between the obtained value and the true value
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  4. It is the difference between the obtained value and the true value
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