14,988+ Questions · 21 Subjects · Free to Practice

MCQ Questions

Questions

Practice mode — a mixed feed of questions and articles for each subject. Prefer reading first? Browse the Articles index instead →

Articles

Study mode — the full article library for each subject, no practice questions mixed in. Want to practice instead? Browse Questions by subject →

The Iron Pillar at Mehrauli in Delhi, from the Gupta period, has famously resisted rusting for over 1,600 years. What causes this resistance?

Please wait…

1. The Iron Pillar at Mehrauli in Delhi, from the Gupta period, has famously resisted rusting for over 1,600 years. What causes this resistance?

A thin protective layer that forms naturally from the iron’s specific composition and manufacturing process

A modern chemical coating applied during a 20th-century restoration

The pillar being kept permanently indoors, away from any weather

A layer of gold plating applied by Gupta craftsmen

Loading…

MCQquestion.com

Free MCQ practice for UPSC and State competitive exams — 30,000+ questions across 21 subjects, with the reasoning behind every answer.