JEE Advanced 2021 Full Test 2 Paper 1

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SECTION – C (Numerical Answer Type)
This section contains 06 questions. The answer to each question is a NUMERICAL VALUE. For each question, enter the correct numerical value (in decimal notation, truncated/rounded‐off to the second decimal place; e.g. XXXXX.XX).

Question : 18 of 54

Marks: +1, -0

A 20mm diameter copper pipe is used to carry heated water. The external surface of the pipe is at T=80°C and its surrounding is at T0=20°C. The outer surface of the pipe radiates like a black body and also loses heat due to convection. The convective heat loss per unit area per unit time is given by h(T−T0) where h=6W(m2K)−1. Calculate the total heat lost by the pipe in unit time for one meter of its length.

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