General Science/Everyday Science MCQs
Topic Notes: General Science/Everyday Science
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
311
Which resources are inexhaustible?
Answer:
re inexhaustible?
Renewable resources like sunlight, wind, and tides are virtually inexhaustible on human timescales. Fossil fuels and minerals are exhaustible because they take millions of years to form.
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312
Solar energy is stored in:
Answer:
Fossil fuels
Fossil fuels are ancient solar energy stored as chemical bonds in carbon-rich deposits. Plants originally captured solar energy via photosynthesis. Biomass is a shorter-term storage system.
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313
Which energy source is less eco-friendly than others?
Answer:
Nuclear
Although nuclear power emits little COâ‚‚, radioactive waste and accident risks make it less eco-friendly. Wind, solar, and biogas have lower long-term risks.
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314
OTEC (Ocean Thermal Energy Conversion) refers to technology that:
Answer:
onversion) refers to technology that:
OTEC exploits the temperature difference between warm surface water and cold deep water to run turbines. This renewable technology is most viable in tropical regions with stable thermal gradients.
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315
Uranium is a ______ mineral.
Answer:
______ mineral.
Uranium is a naturally radioactive mineral, used as nuclear fuel. Its isotopes U-235 and U-238 are key for nuclear energy production. It is not electromagnetic or radiowave in nature.
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316
A major disadvantage of most renewable energy sources is:
Answer:
Unreliable or intermittent supply
Solar and wind power depend on weather and time, making supply variable. Storage technologies can reduce this problem. Renewable energy is otherwise clean and has low running costs.
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317
Which of the following is NOT a renewable energy source?
Answer:
Fossil fuels
Fossil fuels like coal, oil, and natural gas are finite and take millions of years to form. Solar, wind, and tidal energy are renewable as they naturally replenish.
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318
The Chernobyl nuclear disaster occurred in:
Answer:
1986
The Chernobyl accident in Ukraine (then USSR) in April 1986 was the worst nuclear disaster in history. It released massive radioactive contamination, affecting millions and leaving long-term ecological damage.
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319
Biomass power generation uses:
Answer:
All of the above
Biomass energy is derived from organic matter including crop residues, wood, and animal dung. These materials are renewable if managed sustainably. Biomass helps reduce reliance on fossil fuels.
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320
Oil and gas are preferred fuels because of:
Answer:
All of the above
Oil and gas are energy-dense, relatively cheap, and easily transported through pipelines and tankers. These advantages made them dominant fuels, despite environmental drawbacks.
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