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. RRB NTPC
  6. ›
  7. 2021
  8. ›
  9. Q78

RRB NTPC 2021 · Question 78 of 131

What is the area of the largest square that is inscribed in a semicircle of radius 10 cm?

  1. A70 cm²
  2. B90 cm²
  3. C80 cm²Correct
  4. D120 cm²

Answer: C. 80 cm²

Explanation

ATQ- x2+(x/2)2= (10)2 x2+x2/4 =100 5x2/4=100 x2 =20×4=80 x2=80

Source: RRB NTPC 2021 CBT 1 Previous Year Paper (3 Feb) — ixambee compilation with answer key · reliable-secondary

← Q77View full paper (131 questions)Q79 →

Practice the full RRB NTPC 2021 paper

Timed test with all 131 questions, just like the real exam.

Start test