UPSC PYQPrelims 2021

Civil Services Examination · Question 25

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.

  1. 1, 2, 3 and 5 only
  2. 1, 2 and 4 only
  3. 3, 4 and 5 only
  4. 1, 2, 3, 4 and 5
Show answer & explanation

Answer: (B) 1, 2 and 4 only

Explanation

Airborne magnetite nanoparticles (linked to Alzheimer's in studies) come from combustion and friction: vehicle brakes, engines and power plants.