Physics · 2021
JEE Main · 27 July 2021, Shift 1 · Q13
A body takes 4 min. to cool from 61^° C to 59^° C. If the temperature of the surroundings is 30°C, the time taken by the body to cool from 51°C to…
A body takes $\displaystyle 4$ min. to cool from $\displaystyle 61^{\circ} \mathrm{C}$ to $\displaystyle 59^{\circ} \mathrm{C}$. If the temperature of the surroundings is $\displaystyle 30$°C, the time taken by the body to cool from $\displaystyle 51$°C to $\displaystyle 49$°C is :
Official answer
(3)
$\displaystyle 6$ min.
More from Heat Transfer
- As per the given figure, two plates A and B of thermal conductivity K and 2 K are joined together to form a compound plate. The thickness of plates…2022
- A bowl filled with very hot soup cools from 98^° C to 86^° C in 2 minutes when the room temperature is 22°C. How long it will take to cool from 75°C…2023
- Two identical metal wires of thermal conductivities K_1 and K_2 respectively are connected in series. The effective thermal conductivity of the…2021
- A body cools from 80^° C to 60^° C in 5 minutes. The temperature of the surrounding is 20^° C. The time it takes to cool from 60^° C to 40^° C is:2023
- Which is the correct graph to explain the Newton's law of cooling. T and T_0 are the temperatures of hot body and surrounding respectively.2021
- A rod CD of thermal resistance 10.0 KW^-1 is joined at the middle of an identical rod AB as shown in figure. The ends A, B and D are maintained at…2021
- The temperature of a body in air falls from 40^° C to 24^° C in 4 minutes. The temperature of the air is 16°C. The temperature of the body in the…2025
- A cup of coffee cools from 90^° C to 80^° C in t minutes when the room temperature is 20^° C. The time taken by the similar cup of coffee to cool…2025
JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.