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
371
The Red Data Book maintains records of:
Answer:
Plants and animals that are endangered
The Red Data Book, published by the IUCN, lists endangered and threatened species. It categorizes them into levels of threat such as “critically endangered” or “vulnerable.” It is a key tool for conservation.
---
372
The dominant second trophic level in a lake ecosystem is:
Answer:
Zooplankton
Zooplankton are primary consumers that feed on phytoplankton (the first trophic level). They serve as a critical link to fish and other higher consumers. Benthos live at the bottom and are not dominant in the second level.
---
373
The association of animals in which both partners benefit is called:
Answer:
ssociation of animals in which both partners benefit is called:
In mutualism, both partners gain—like pollinators and flowering plants. Commensalism benefits one without affecting the other, and ammensalism harms one without benefit. Colonies are social groups of the same species.
---
374
Pick the correct food chain:
Answer:
Phytoplankton → Zooplankton → Fish
In aquatic ecosystems, phytoplankton are producers consumed by zooplankton, which in turn feed fish. The other sequences are not logically correct food chains. This linear energy flow illustrates trophic levels.
---
375
Which statement is true about ecosystems?
Answer:
bout ecosystems?
Producers form the base of food chains, supplying energy to all consumers. They are more numerous and diverse than herbivores or carnivores. Without abundant producers, ecosystems cannot sustain higher trophic levels.
---
376
Total Earth’s surface covered by water is approximately:
Answer:
overed by water is approximately:
About three-quarters of Earth’s surface is covered by oceans, seas, lakes, and rivers. Most of this water is saline, with only a small fraction as freshwater. This coverage regulates global climate and weather.
---
377
The major raw material for biogas production is:
Answer:
Cow dung
Cow dung provides the best feedstock for biogas plants due to its high organic content and bacterial population. Kitchen waste and other biomass can also be used but are less stable as the main input.
---
378
Which one of the following is **not** a fossil fuel?
Answer:
fossil fuel?
Uranium is a radioactive mineral fuel used in nuclear power, but it is not derived from fossilized organic matter. Coal, petroleum, and natural gas are fossil fuels formed from ancient biological material.
---
379
Which of the following is an example of non-renewable resources?
Answer:
Coal and minerals
Coal and minerals are finite, formed over millions of years, and cannot be replenished within human timescales. Wind, water, and vegetation renew naturally. Hence, they are non-renewable.
---
380
Non-renewable resources, once used:
Answer:
Remain on Earth in a different form
Non-renewables like coal, oil, and minerals cannot be regenerated on human timescales. They remain in altered forms (e.g., CO₂ after combustion). This makes them fundamentally different from renewable resources.
---