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Two metal boxes and with heat capacity and respectively are interconnected by a rod of length , cross-sectional area and Thermal conductivity . At , temperature of and is and respectively. Find time when temperature of is .
(a)
(b)
(c)
(d)

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Important Questions on Thermal Properties of Matter
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In an experiment with a continuous flow calorimeter, an input power of produced a rise of in the liquid. When the power was tripled, the same temperature rise was achieved by making the rate, of flow of liquid $n$ times its initial value. If the power lost to the surrounding in each case is , value of is

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A brass rod and an aluminium rod each of length and same cross section area are placed in contact with each other as shown. Temperature of both the rods is raised by . The coeffcients of linear expansion of brass and aluminium are and respectively. If the Young's moduli of brass and aluminium are and respectively then stress in the rods is

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Two metallic rods of equal length and cross-section but thermal conductivities and are welded together end to end. The resulting thermal conductivity of this resulting rod will be

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A metal sphere having inner radius a and outer radius has thermal conductivity . The thermal resistance between inner and outer surface for radial heat flow is

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The figure shows the face and interface temperature of a composite slab consisting of four materials, of identical thickness, through which the heat transfer is steady. Which material has maximum thermal conductivity?

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In a room where the temperature is a body cools from to in . The time (in min) taken by the body to cool from to will be

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A block of ice at is slowly heated and converted to steam at . Which of the following curves represent the phenomenon qualitatively?

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The wavelength corresponding to maximum spectral radiancy of a black body is . Consider another black body whose surface area is twice that of and total radiant energy emitted by is times that emitted by . The wavelength corresponding to maximum spectral radiancy for will be
