Green manure is obtained from: MCQ with Answer and Explanation

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Green manure is obtained from:

A. Animal waste

B. Chemical synthesis

C. Decomposed plant material

D. Fungal cultures

Answer: Option C

Solution (By JKSSB Mock Tests)

Green manure refers to crops (like sunn hemp or dhaincha) that are grown specifically to be plowed back into the soil while they are still green. This decomposing plant material enriches the soil with organic matter, nitrogen, and other nutrients, improving soil structure and fertility.

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Question #1

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Which alloy is composed of iron, nickel, and chromium and is known for its resistance to corrosion?

A. Bronze

B. Stainless steel

C. Brass

D. Solder

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Correct Answer: Option B

Explanation:
Stainless steel is an alloy of iron with chromium (minimum 10.5%), often nickel, and sometimes molybdenum. Chromium forms a passive oxide layer (Cr₂O₃) that prevents rusting. Brass is Cu + Zn. Bronze is Cu + Sn. Solder is Pb + Sn. Stainless steel is used in kitchen utensils, surgical instruments, and architecture. The most common type is 304 stainless (18% Cr, 8% Ni).

This question belongs to: Science chemistry

Question #2

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In a redox reaction:

A. Only reduction occurs.

B. Neither oxidation nor reduction occurs.

C. Only oxidation occurs.

D. Oxidation and reduction occur simultaneously.

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Correct Answer: Option D

Explanation:
Redox stands for reduction-oxidation. In any redox reaction, oxidation (loss of electrons) and reduction (gain of electrons) always occur simultaneously. The substance oxidized acts as a reducing agent, and the substance reduced acts as an oxidizing agent. One cannot happen without the other.

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Question #3

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Which of the following is NOT a method of concentration of ore?

A. Leaching

B. Magnetic separation

C. Froth flotation

D. Smelting

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Correct Answer: Option D

Explanation:
Smelting is a reduction process, not concentration. Concentration (beneficiation) methods include gravity separation, magnetic separation, froth flotation, and leaching (chemical). Smelting involves heating concentrated ore with a reducing agent to extract metal. For example, hematite concentrated by washing, then smelted in blast furnace.

This question belongs to: Science chemistry

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