Question
UPSC Prelims 2021 Question:
- Brakes of motor vehicles
- Engines of motor vehicles
- Microwave stoves within homes
- Power plants
- Telephone lines
Select the correct answer using the code given below.
Answer (Detailed Solution Below)
Option 2: 1, 2 and 4 only
Detailed Solution
Explanation:
- Magnetite is an iron-oxide mineral that occurs naturally on Earth. However, it can be released to the environment through human activities:
- It has been identified in diesel exhaust, as brake-abrasion particles, in the air of underground stations, along railway lines, at welding workplaces, and in the emissions from industrial combustion processes. There is no evidence of generation of magnetite particles from either domestic microwave stoves or telephone lines.
Therefore, option (2) is the correct answer.
Relevance: Toxic air pollution particles found in human brains
Subject: Environment
Latest UPSC Exam 2026 Updates
Last updated on March, 2026
