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

  • question_answer
    An incandescent lamp consuming \[P=54\text{ }W\]is immersed into a transparent calorimeter containing \[V={{10}^{3}}c{{m}^{3}}\]of water. In 420s the water is heated by\[4{}^\circ C\]. The percentage of the energy consumed by the lamp that passes out of the calorimeter in the form of radiant energy is

    A) 81.5%  

    B) 26%

    C) 40.5% 

    D) 51.5%

    Correct Answer: B

    Solution :

    [b] Power sent to heat the water in the calorimeter \[P'=\frac{ms\Delta \theta }{t}=\frac{Vps\Delta \theta }{t}=\frac{{{10}^{3}}\times {{10}^{-6}}\times {{10}^{3}}\times 4200\times 4}{420}=40W\] Required ratio \[=\frac{P-P'}{P}=\frac{54-40}{54}=\frac{14}{54}=26\]%


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