Q1. The main component of biogas (gobar gas) is:
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Answer: D. Methane
Biogas is mainly methane (about 75%).
Chemistry - Everyday Chemistry Questions for SSC CGL (with Answers)
9 Chemistry - Everyday Chemistry MCQs from the General Awareness section, with answers and short explanations.
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Q2. The main raw material used for making glass is:
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Answer: A. Silica (sand)
Silica, SiO2 (sand), is the main ingredient of glass.
Q3. The three primary plant nutrients supplied by NPK fertilisers are:
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Answer: C. Nitrogen, phosphorus and potassium
N, P and K stand for nitrogen, phosphorus and potassium.
Q4. Which gas is commonly used in fire extinguishers?
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Answer: C. Carbon dioxide
CO2 cuts off the oxygen supply to the fire.
Q5. The main component of LPG (liquefied petroleum gas) is:
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Answer: A. Butane
LPG consists mainly of butane.
Q6. Which fuel has the highest calorific value?
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Answer: D. Hydrogen
Hydrogen has the highest calorific value (about 150 kJ/g) among common fuels.
Q7. Which compound is added to LPG so that a leak can be detected by its smell?
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Answer: B. Ethyl mercaptan
LPG itself is odourless; ethyl mercaptan is added to give it a strong smell.
Q8. Which compound is used for artificial rain by cloud seeding?
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Answer: D. Silver iodide
Silver iodide crystals act as nuclei for ice formation in clouds.
Q9. Approximately what percentage of nitrogen by mass is present in urea, CO(NH2)2? (C = 12, O = 16, N = 14, H = 1)
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Answer: D. 46.7%
N = 28 of 60, i.e. 28/60 x 100 = about 46.7%.
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