PYQPulse
HomeMocksPracticePYQsUpdatesDashboard
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. TNPSC Group-I
  6. ›
  7. 2021
  8. ›
  9. Q135

TNPSC Group-I 2021 · Question 135 of 148

A hemispherical tank of radius 1.75 m is full of water. It is connected with a pipe which empties the tank at the rate of 7 litres per second. How much time will it take to empty the tank completely approximately?

Aptitude - Mensuration

  1. A27 minutesCorrect
  2. B26 minutes
  3. C72 minutes
  4. D62 minutes

Answer: A. 27 minutes

Explanation

Volume = (2/3)π(1.75)^3 ≈ 11,224 litres; at 7 litres/sec this takes about 1603 seconds ≈ 27 minutes.

Source: TNPSC Group-I Prelims (held 3 Jan 2021) - official paper via examrace.com

← Q134View full paper (148 questions)Q136 →

Practice the full TNPSC Group-I 2021 paper

Timed test with all 148 questions, just like the real exam.

Start test