PYQPulse
HomeMocksPracticePYQsDashboard
PYQPulse

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. PYQPulse is not affiliated with the Staff Selection Commission, IBPS, SBI, RBI, NABARD, SEBI or Indian Railways.

© 2026 PYQPulse. All rights reserved.

Built for aspirants, by aspirants.

HomeMocksPracticeStats
  1. Home
  2. ›
  3. PYQs
  4. ›
  5. UPPSC PCS
  6. ›
  7. 2021
  8. ›
  9. Q128

UPPSC PCS 2021 · Question 128 of 150

With reference to the radioactivity, which of the following statements is/are correct? 1. Radioactivity is a nuclear property. 2. Hydrogen bomb is prepared on the principle of nuclear fission.

Science & Tech

  1. AOnly 1Correct
  2. BOnly 2
  3. CBoth 1 and 2
  4. DNeither 1 nor 2

Answer: A. Only 1

Explanation

Radioactivity is a nuclear property; the hydrogen bomb works on nuclear fusion, not fission.

Source: https://www.drishtiias.com/images/pdf/UPPSC 2021 Prelims GS Paper -1.pdf

← Q127View full paper (150 questions)Q129 →

Practice the full UPPSC PCS 2021 paper

Timed test with all 150 questions, just like the real exam.

Start test