A composite block is made of slabs $A$ , $B$ , $C$ , $D$ and $E$ of different thermal conductivities (given in terms of a constant $K$ ) and sizes (given in terms of length, $L$ ) as shown in the figure. All slabs are of same width. Heat $Q$ flows only from left to right through the blocks. Then, in steady state:

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Important Questions on Thermal Conduction

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 17

A water-drop is sprinkled on a red-hot iron plate. The drop becomes spherical and does not vaporise at once because :

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 18

While measuring the thermal conductivity of a liquid, we keep the upper part hot and the lower part cold, because :

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 19

It is hotter at the same distance over the top of a fire than it is on the side of it, mainly because :

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 20

In which of the following processes, convection of heat does not take place?

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ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 21

Two rectangular blocks, having identical dimensions, can be arranged either in configuration $(i)$ or in configuration $(i i)$ , as shown in the figure. One of the blocks has thermal conductivity $K$ and the other $2 K$ . The temperature difference between the ends along the $X$ axis is the same in both the configurations. It takes $9 s$ to transport a certain amount of heat from the hot end to the cold end in the configuration $(i)$ . The time to transport the same amount of heat in the configuration $(i i)$ is: