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
351
The major purpose of most dams worldwide is:
Answer:
Irrigation
While dams serve multiple purposes, irrigation is the most common globally. They also generate hydroelectricity, control floods, and supply water. In agricultural economies, irrigation dominates usage.
---
352
Eutrophication refers to:
Answer:
Accumulation of nutrients in water bodies
Excess nitrogen and phosphorus lead to algal blooms and oxygen depletion. This disrupts aquatic ecosystems, causing fish kills and biodiversity loss. Eutrophication often results from agricultural runoff and sewage.
---
353
Earth Day is held every year on:
Answer:
April 22
Earth Day, first celebrated in 1970, is now a global event promoting environmental awareness. It highlights issues like climate change, biodiversity, and conservation. June 5 is World Environment Day, not Earth Day.
---
354
A key element of Environmental Impact Assessment (EIA) is:
Answer:
key element of Environmental Impact Assessment (EIA) is:
Scoping identifies the scope of issues, impacts, and alternatives that must be studied in an EIA. It ensures focused, efficient assessment. Ignoring alternatives or stakeholders undermines the EIA process.
---
355
Vehicular pollution depends on:
Answer:
epends on:
Engine design, vehicle age, and traffic patterns all influence emissions. Older engines emit more pollutants, and congested traffic increases idling emissions. Integrated measures are needed to control vehicular pollution.
---
356
To protect health along roadsides, one should:
Answer:
long roadsides, one should:
Roadside plantations absorb pollutants, reduce dust, and act as noise barriers. They improve air quality for nearby communities. Relocation and bans are less practical compared to afforestation.
---
357
The most common method of mining is:
Answer:
Surface mining
Surface mining is the most widely used method due to its lower cost and efficiency. It includes open-pit and strip mining. Subsurface and underground methods are used where deposits are deeper.
---
358
A sustainable society is one that:
Answer:
Meets present needs without harming future generations
This aligns with the Brundtland Commission’s definition of sustainable development. It emphasizes balancing economic growth, environmental protection, and social equity. Sustainability ensures long-term human and ecological well-being.
---
359
What is a watershed?
Answer:
Both (a) and (c)
A watershed is an area of land where all precipitation drains into a common outlet, such as a river or lake. It defines the hydrological boundary of catchment systems. Proper watershed management prevents floods and maintains water quality.
---
360
Which of the following would NOT traditionally support an eco-friendly economy?
Answer:
n eco-friendly economy?
Supporting clean energy vehicles is essential for reducing emissions. Cutting subsidies discourages adoption. All the other practices strengthen a sustainable economy.
---