JEE Main 2021 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 27 August 2021, Shift 2, Physics Q7

Question 7 of 90 in this shift, Physics question 7 of 30, Section A.

The height of victoria falls is 63 m. What is the difference in temperature of water at the top and at the bottom of fall ? [Given 1 cal

=4.2

J and specific heat of water

=1

cal

\mathrm{g^{-1}\ ^\circ C^{-1}}

]

(1) $0.014^\circ\mathrm{C}$
(2) $0.147^\circ\mathrm{C}$ Official answer
(3) $1.476^\circ\mathrm{C}$
(4) $14.76^\circ\mathrm{C}$

Official answer

Option 2

NTA final key.

Chapter: Thermodynamics
Topic: Calorimetry
Idea tested: Specific Heat Capacity

Same idea in other shifts

Asked 3× in all

26 Jun 2022, Shift 2 · Q54A geyser heats water flowing at a rate of 2.0 kg per minute from $30^\circ$ C to $70^\circ$ C. If geyser operates on a gas burner, the rate…EasyNumerical value
26 Aug 2021, Shift 2 · Q12The temperature of equal masses of three different liquids $x$ , $y$ and $z$ are $10^\circ$ C, $20^\circ$ C and $30^\circ$ C respectively. The…MediumSingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.