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
151
The best practice to minimize construction and demolition (C&D) waste is:
Answer:
est practice to minimize construction and demolition (C&D) waste is:
Planning connections and modules allows future reuse. Salvage reduces virgin material demand. Recycling aggregates diverts waste from landfills.
---
152
A rapidly renewable material used as a low-carbon building resource is:
Answer:
Bamboo
Bamboo grows quickly and stores carbon. Engineered bamboo products can replace high-impact materials. Certification ensures sustainable sourcing.
---
153
The principal hazard of arsenic in groundwater is:
Answer:
Skin lesions and cancer with chronic exposure
Long-term ingestion causes hyperpigmentation, keratosis, and internal cancers. Treatment includes adsorption and coagulation. Source switching is often the fastest remedy.
---
154
The most efficient orientation for passive solar gain (in the Northern Hemisphere) is:
Answer:
South-facing glazing
South orientation maximizes winter sun and allows summer shading with overhangs. East/west exposures are harder to shade. Design balances daylight, glare, and heat.
---
155
A “carbon sink” is defined as a system that:
Answer:
Absorbs more carbon than it emits
Forests, soils, and oceans are major sinks. Degradation can convert sinks into sources. Enhancing sinks is a mitigation strategy.
---
156
A major co-benefit of shifting freight from road to rail is:
Answer:
Lower emissions and reduced road wear
Rail is more energy-efficient per ton-km and alleviates highway congestion. Electrified rail further cuts emissions. Intermodal logistics enable efficient transfers.
---
157
The safest disposal route for sharps (medical needles) is:
Answer:
Secure sharps containers and regulated treatment
Proper containers prevent injuries and infections. Treatment may include autoclaving or incineration per rules. Improper disposal endangers workers and the public.
---
158
A common metric for building energy performance is:
Answer:
common metric for building energy performance is:
It normalizes energy use by floor area over a year for comparison. Lower values indicate better performance. It informs codes and certifications.
---
159
The best strategy to protect pollinators in agriculture is to:
Answer:
est strategy to protect pollinators in agriculture is to:
Floral resources and habitat connectivity support pollinator health. Targeted IPM reduces harmful exposures. Timing sprays away from bloom and evenings helps.
---
160
The primary purpose of a sedimentation basin in water treatment is to:
Answer:
Settle flocculated particles
After coagulation–flocculation, basins allow solids to settle by gravity. Clarified water moves on to filtration and disinfection. Proper detention time is essential.
---