Apedia Logo Apedia
Join

Choose Language

Select your preferred reading language
🇬🇧
English
✔
🇮🇳
हिन्दी
✔
✕
Full View
Environment
Pollution
EN हिंदी
✕
UPSC Prelims 2021 Paper-1 📅 10 Oct, 2021

Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following?
1. Brakes of motor vehicles
2. Engines of motor vehicles
3. Microwave stoves within homes
4. Power plants
5. Telephone lines

Select the correct answer using the code given below.

A
1, 2, 3 and 5 only
B
1, 2 and 4 only
C
3, 4 and 5 only
D
1, 2, 3, 4 and 5
Result Summary
Logo

APEDIA

UPSC Prelims
2021 • 10 Oct, 2021 • Paper-1
Magnetite particles, suspected to cause neurodegenerative problems, are generated as environmental pollutants from which of the following?
1. Brakes of motor vehicles
2. Engines of motor vehicles
3. Microwave stoves within homes
4. Power plants
5. Telephone lines

Select the correct answer using the code given below.
Correct Answer
1, 2 and 4 only
Source Mechanisms: Magnetite nanoparticles are typically formed under high-temperature conditions involving iron, such as intense friction or the combustion of ......
Ref/Book : UPSC Prelims 2021
Ref. Subject Environment
Chapter -
Ref. Topic Pollution
Pg. No -
💡 Analysis & Explanation
Source Mechanisms ▼
Magnetite nanoparticles are typically formed under high-temperature conditions involving iron, such as intense friction or the combustion of fossil fuels.
Identifying the Polluters ▼
In an urban environment, the friction generated by the brake pads of motor vehicles, the internal combustion within vehicle engines, and the large-scale industrial combustion processes in power plants are major sources of airborne magnetite pollution. Thus, items 1, 2, and 4 are correct.
Eliminating Incorrect Sources ▼
Microwave stoves use electromagnetic radiation to heat food and do not involve combustion or heavy mechanical friction of iron components. Similarly, telephone lines transmit electrical signals and do not emit particulate matter. Thus, items 3 and 5 are incorrect.
Conclusion ▼
Motor vehicles (brakes and engines) and power plants are the primary generators of these specific particles.
← Prev
25 / 100
Next →