Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Olympiad workbookNSEPThermal Properties of Matter

Consider a composite slab consisting of two different materials having equal thickness and equal area of cross-section. The thermal conductivities are K and 2 K respectively. The equivalent thermal conductivity of the composite slab is

Options

  1. A2 ~K 3
  2. B2 ~K
  3. C3 K
  4. D4 ~K 3

Correct answer

D. 4 ~K 3

Step-by-step solution

No Solution

Practice Thermal Properties of Matter on Quantrex Academy →

More from Thermal Properties of Matter

A small pond of depth 0.5 m deep is exposed to a cold winter with outside temperature of 263 K . Thermal conductivity of ice is K=2.2 Wm ⁻¹ ~K ⁻¹ , latent heat L=3.4 10^5 Jkg ⁻¹ anTwo identical rods made of two different metals A and B with thermal conductivities K_ A and K_ B respectively are joined end to end. The free end of A is kept at a temperature T₁ A steel cooking pan has copper coating at its bottom. The thickness of copper coating is half the thickness of steel bottom. The conductivity of copper is three times that of steelTwo identical rooms in a house are connected by an open doorway. The temperatures in the two rooms are maintained at two different values. Therefore,A metallic wire of length l is held between two supports under some tension. The wire is cooled through ^ . Let Y be the Young's modulus, the density and the thermal coefficient ofA sphere and a cube having equal surface area are made of the same material. The two are heated to the same temperature and kept in identical surrounding. The ratio of their initiaPlots of intensity (I) of radiation emitted by a black body versus wavelength ( ) at three different temperatures T ₁, ~T ₂ and T ₃ respectively are shown in figure. Choose the corThe temperature of an isolated black body falls from T₁ to T₂ in time t . Then, t=C x where x is Full Thermal Properties of Matter list All Olympiad workbook PYQs