Testwala logoTestwala
HomeMocksPracticePYQsDashboard
Testwala logoTestwala

Timing-accurate mock tests and PYQs for SSC, Banking and Railway exams — so the real paper feels like a revision.

Exams

  • SSC exams
  • Banking exams
  • Railway exams
  • All exams

Practice

  • Practice questions
  • Mock test series
  • Sectional tests
  • Year-wise PYQs
  • Performance analytics

Company

  • About us
  • Help Centre
  • Pricing
  • Sign in

Legal

  • Privacy Policy
  • Terms of Service

Contact

  • hello@testwala.co.in
  • Telegram
  • +91 62816 87760

Practice interface modeled on the official exam pattern — not the official examination. Testwala is not affiliated with the Staff Selection Commission, IBPS, SBI, RBI, NABARD, SEBI or Indian Railways.

© 2026 Testwala. All rights reserved.

Built for aspirants, by aspirants.

HomeMocksPracticeStats
  1. Home
  2. ›
  3. PYQs
  4. ›
  5. UPPSC PCS
  6. ›
  7. 2011
  8. ›
  9. Q71

UPPSC PCS 2011 · Question 71 of 103

Helium is preferred to hydrogen in air balloons because it

General Knowledge

  1. Ais cheaper
  2. Bis less dense
  3. Chas greater lifting power
  4. Ddoes not form an explosive mixture with air.Correct

Answer: D. does not form an explosive mixture with air.

Explanation

Answer per Examrace/exampyq.com solved paper (2011).

Source: Examrace/exampyq.com UPPSC General Studies 2011 Solved Paper

← Q70View full paper (103 questions)Q72 →

Practice the full UPPSC PCS 2011 paper

Timed test with all 103 questions, just like the real exam.

Start test