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NEET Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Mock Test - Thermal Properties of Matter

  • question_answer
    Two plates identical in size, one of black and rough surface (\[{{B}_{1}}\]) and the other smooth and polished (\[{{A}_{2}}\]) are interconnected by a thin horizontal pipe with a mercury pellet at the centre. Two more plates \[{{A}_{1}}\] (identical to\[{{A}_{2}}\]) and\[{{B}_{2}}\] (identical to\[{{B}_{1}}\]) are heated to the same temperature and placed closed to the plates \[{{B}_{1}}\] and \[{{A}_{2}}\] as shown in figure. The mercury pellet

    A) moves to the right

    B)  moves to the left

    C)  remains stationary

    D)  starts oscillating left and right

    Correct Answer: C

    Solution :

    [c] Smooth and polished plates are poor radiators of heat. Hence, heat coming out from A is small, even though B being a black and rough plate is a good absorber. Effectively the heat coming to the left of pellet P is small. Black and rough plates are good radiators of heat. Hence, plate \[{{B}_{2}}\] radiates heat to a satisfactory level; however, plate\[{{A}_{2}}\], being smooth and polished, is a bad absorber. Effectively, the heat coming to the right of P is also small.


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