Fossil fuels are formed from: MCQ with Answer and Explanation

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Fossil fuels are formed from:

A. Direct combination of elements

B. Volcanic eruptions

C. Meteorites

D. Remains of dead plants and animals buried millions of years ago

Answer: Option D

Solution (By JKExamLibrary)

Fossil fuels (coal, petroleum, natural gas) are formed from organic matter deposited in sedimentary layers, subjected to heat and pressure over geological timescales. They are non-renewable because their formation takes millions of years.

This question belongs to: Science chemistry

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Question #1

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Vulcanization of rubber uses:

A. Nitrogen

B. Sulfur

C. Oxygen

D. Carbon

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Correct Answer: Option B

Explanation:
Sulfur forms cross-links between polyisoprene chains, converting sticky raw rubber into strong, elastic material. Process discovered by Goodyear.

This question belongs to: Science chemistry

Question #2

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Faraday's second law: When same charge is passed, masses deposited are proportional to:

A. Molecular masses

B. Atomic masses

C. Densities

D. Equivalent weights

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Correct Answer: Option D

Explanation:
m₁/m₂ = E₁/E₂ where E = atomic mass / valency. This is Faraday's second law of electrolysis. It relates mass to chemical equivalent.

This question belongs to: Science chemistry

Question #3

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Which of the following alloys contains lead?

A. Solder

B. Brass

C. Bronze

D. Duralumin

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Correct Answer: Option A

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.

This question belongs to: Science chemistry

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