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UPPSC PCS 2019 · Question 145 of 150

A liquid remains hot or cold for a long time in thermos flask because there is no loss or gain of heat by

Science & Tech

  1. AConduction
  2. BConvection and radiation
  3. CBoth (a) and (b)Correct
  4. DNone of the above

Answer: C. Both (a) and (b)

Explanation

A thermos prevents heat transfer by conduction, convection and radiation.

Source: https://theexampillar.com/uppsc-pcs-acf-and-rfo-pre-exam-paper-2019-paper-1-in-english-answer-key/

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