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The ends of a rod of uniform thermal conductivity are maintained at different (constant) temperatures. After the steady state is achieved,

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Important Questions on Transmission Of Heat

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JEE Main

IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 15

The thermal conductivity of a material in

CGS

system is

0.4

. In steady state, the rate of flow of heat is

10 cal s^{- 1} {cm}^{- 2}

. Then the thermal gradient will be _____

° C {cm}^{- 1}

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 16

Two vessels of different materials are similar in size in every respect. The same quantity of ice filled in them gets melted in

20 minutes

and

30 minutes

. The ratio of their thermal conductivities will be _____.

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JEE Main

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 17

Two walls of thicknesses

d_{1}

and

d_{2}

and thermal conductivities

K_{1}

and

K_{2}

are in contact. In the steady state, if the temperatures at the outer surfaces are

T_{1}

and

T_{2}

, then the expression involving temperature at the common wall is

θ (K_{1} d_{2} + K_{2} d_{1}) = K_{1} d_{2} T_{1}

_____

K_{2} d_{1} T_{2}

, Complete the expression of temperature.

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 18

Two identical plates of different metals are joined to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are

2

and

3

, respectively, then the conductivity of composite plate will be _____.

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 19

The ratio of the diameters of two metallic rods of the same material is

2 : 1

and their lengths are in the ratio

1 : 4

. If the temperature difference between their ends are equal and the rate of flow of heat in them will be in the ratio of

\frac{2 α}{1}

then

α =

_____.

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IMPORTANT

Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 20

Two cylinders

P

and

Q

have the same length and diameter and are made of different materials having thermal conductivities in the ratio

2 : 3

. These two cylinders are combined to make a cylinder. One end of

P

is kept at

100 ° C

and another end of

Q

0 ° C

. The temperature at the interface of

P

and

Q

is _____

° C

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 1

Half part of the ice block is covered with black cloth and rest half is covered with white cloth and then it is kept in sunlight. After some time, clothes are removed to see the melted ice. Which of the following statements is correct?

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Chapterwise/Topicwise Daily Practice Problems (DPP) Waves & Thermodynamics JEE Main & Advanced>Chapter 2 - Transmission Of Heat>DPP>Q 2

Two thermometers

A

and

B

are exposed to sunlight. The valve of

A

is painted black, but that of

B

is not painted. The correct statement regarding this case is

The ends of a rod of uniform thermal conductivity are maintained at different (constant) temperatures. After the steady state is achieved,

Important Questions on Transmission Of Heat

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