2. Solved Papers
  3. Railways

Railways RRB (Assistant Loco Pilot & Technician) Solved Paper-2 (2014)

  • question_answer
    A hot body will radiate heat most rapidly if its surface is

    A)  white and rough       

    B)  white and polished

    C)  black and rough       

    D)  black and polished

    Correct Answer: C

    Solution :

    Radiation is greater from a rough surface because its effective area is greater than its geometric area. Black colour is a good radiator. Hence, black and rough surface shall radiate heat rapidly.


You need to login to perform this action.
You will be redirected in 3 sec spinner