While measuring the thermal conductivity...

While measuring the thermal conductivity of liquids the upper part is kept hot and lower cooled so that .

convection many be stopped

radiation may be stopped

heat conduction is easier downwards

it is easier and more convenient to do so

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Assertion : While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer kept cold. Reason : This avoids heating of liquid by convection.

Two identical plates with thermal conductivities K and 3K are joined together to form a single plate of double thickness. The equivalent thermal conductivity of one composite plate so formed for the flow of heat through its thickness is.

Assertion : The S.I. unit of thermal conductivity is watt m ^(1)1 K^(1) . Reason : Thermal conductivity is a measure of ability of the material to allow the passage of heat through it.

Two liquids of densities p_(1) and p_(2) (p2_= 6 p1 ) are filled up behind a square wall of side 8 m as shown in figure. The liquids have height as shown. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing)

PQ is a fully-lagged metal bar, containing a section XY of a material of lower thermal conductivity. The thermal conductivities of the two materials are independent of temperature. Ends P and Q are maintained at different temperature. In the steady , the temperature difference across XY would be independent of :

Two liquids of densities rho_1 and rho_2(rho_2 = 3 rho_1) are filled up behind a square wall of side 6 m as shown in figure. Each liquid has a height of 3 m. The ratio of the forces due to these liquids exerted on upper part MN to that at the lower part NO is (Assume that the liquids are not mixing)2

Equivalent thermal conductivity of figure given below will be given that length of eachh cylinder is l and area of cylinder having thermal conductivity K_(1) & K_(3) is A while middle cylinder is having K_(2) .

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