James Chadwick discovered the neutron in the year: MCQ with Answer and Explanation

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Question #1

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Faraday's first law: mass deposited ∝ quantity of electricity. The constant of proportionality (electrochemical equivalent) depends on:

A. Temperature

B. Current

C. Time

D. Nature of the substance

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Correct Answer: Option D

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Explanation:
Electrochemical equivalent (Z) is mass deposited per unit charge. It depends on molar mass and number of electrons transferred (valency). Z = M/(nF). It differs for different substances. Current and time affect total charge but not Z.

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Question #2

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Which of the following alloys contains lead?

A. Bronze

B. Duralumin

C. Solder

D. Brass

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Correct Answer: Option C

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Explanation:
Solder is an alloy primarily used for welding electrical components and pipes. It is traditionally composed of lead (Pb) and tin (Sn), typically in a 60:40 or 50:50 ratio. Brass is copper and zinc, bronze is copper and tin, and duralumin is an alloy of aluminum, copper, magnesium, and manganese.

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Question #3

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Enzymes in yeast catalyze the conversion of glucose to ethanol. This is an example of:

A. Saponification

B. Fermentation

C. Oxidation

D. Esterification

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Correct Answer: Option B

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Explanation:
Fermentation is an anaerobic biological process in which enzymes (zymase) convert glucose to ethanol and CO₂: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Oxidation would require oxygen. Esterification forms esters, saponification makes soap. Fermentation is used in brewing, winemaking, and baking (where CO₂ makes bread rise). The temperature is kept around 30-35°C.

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