The fuel with the highest calorific value per gram is: MCQ with Answer and Explanation

The fuel with the highest calorific value per gram is:
A. Coal
B. Hydrogen
C. Wood
D. Methane
Answer: Option B
Solution (By JKSSB Mock Tests)
Hydrogen has about 141.9 kJ/g, the highest of any fuel. Methane ~55.5 kJ/g, coal ~25-35 kJ/g, wood ~17 kJ/g. Hydrogen produces only water on combustion, making it a clean fuel.

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Practice More chemistry Questions

Question #1
The pH of a solution that turns red litmus blue is most likely:
A. 7
B. 6
C. 11
D. 3

Correct Answer: Option C


Explanation:
Red litmus turning blue indicates a basic solution, pH > 7. pH 11 is strongly basic. pH 3 and 6 are acidic (blue litmus turns red). pH 7 is neutral (litmus remains purple). Litmus is a common natural indicator.

This question belongs to: Science chemistry
Question #2
Which of the following is a renewable fuel source?
A. Petroleum
B. Biofuel
C. Natural gas
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Correct Answer: Option B


Explanation:
Biofuels like ethanol (from sugarcane), biodiesel (from plant oils), and biogas (from organic waste) are renewable as they can be replenished within a human lifespan. Coal, petroleum, and natural gas are fossil fuels, formed over millions of years, and are non-renewable. Using renewable fuels helps reduce greenhouse gas emissions. Another renewable fuel is hydrogen produced from water electrolysis using solar power.

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Which of the following is a biofertilizer?
A. Ammonium sulfate
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C. Superphosphate
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Correct Answer: Option B


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