AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

Read the following statements :
A. When small temperature difference between a liquid and its surrounding is doubled, the rate of loss of heat of the liquid becomes twice.
B. Two bodies P and Q having equal surface areas are maintained at temperature 10ºC and 20 ºC. The thermal radiation emitted in a given time by P and Q are in the ratio 1 : 1.15
C. A Carnot Engine working between 100 K and 400 K has an efficiency of 75%
D. When small temperature difference between a liquid and its surrounding is quadrupled, the rate of loss of heat of the liquid becomes twice.
Choose the correct answer from the options given below :

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

A, B, C only

A, B only

A, C only

B, C, D only

answer is A.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Heat Transfer

A. by Newton’s low of colling $\frac{dθ}{dt} =\propto ΔT$

B. $H = \frac{dθ}{dt} = σ {eAT}^{4} \Rightarrow \frac{H_{P}}{H_{Q}} = {(\frac{T_{P}}{T_{Q}})}^{4} = {(\frac{283}{293})}^{4}$

$H_{P} : H_{Q} = 1 (1 .03)^{4} = 1 : (1 .03)^{4} = 1 : 1 .15 \Rightarrow B is correct$

C. $η = 1 - \frac{100}{400} = \frac{3}{4} = 75 %$

D. is wrong as $\frac{dθ}{dt} \propto ΔT$

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!