Thermal Properties of Matter - Result Question 46

47. An object kept in a large room having air temperature of 25C takes 12 minutes to cool from 80C to 70C.

The time taken to cool for the same object from 70C to 60C would be nearly.

[NEET Odisha 2019]

(a) 15min

(b) 10min

(c) 12min

(d) 20min

Show Answer

Answer:

Correct Answer: 47. (a)

Solution:

  1. (a) According to Newton’s law of cooling

(T1T2)t=K(T1+T22T0)

(i)(8070)12=K(7525)(ii)(7060)t=K(6525)

t=12×=15min



NCERT Chapter Video Solution

Dual Pane