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11th ICSE

IMPORTANT

Earn 100

Two plates of equal areas are placed in contact with each other. Their thicknesses are $2.0 cm$ and $3.0 cm$ respectively. The temperature of the external surface of the first plate is $- 25 ° C$ and that of the external surface of the second plate is $25 ° C$ . What will be the temperature of the contact-surface, have thermal conductivities in the ratio $2 : 3$ .

Important Questions on Thermal Conduction

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11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>NUMERICALS>Q 19

An ice box made of

1.75 cm

thick wood has on the inner side a

2.0 cm

thick layer of cork. If, the temperature of the inner surface of the cork is

0 ° C

and that of the outer surface of wood is

12 ° C

, then find the temperature of the interface. Thermal conductivity of wood is

5

times that of cork.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>NUMERICALS>Q 20

A square sheet of cork of side

20 cm

and thickness

3.0 mm

is placed in contact of a square glass sheet of side

20 cm

and thickness

5.0 mm

. The outer faces of this composite sheet are maintained at

100 ° C

and

20 ° C

, the cork face being at higher temperature. Find the temperature of the cork-glass interface. The thermal conductivities of cork and glass are

0.063 W m^{- 1} K^{- 1}

and

0.72 W m^{- 1} K^{- 1}

respectively.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>NUMERICALS>Q 21

A bar of copper of length

0.75 m

and a bar of stainless steel of length

1.25 m

are joined end to end, each having a cross-sectional area of

101 m^{2}

. The free ends of the copper and the steel bars are maintained at

100 ° C

and

0 ° C

respectively. Find the temperature of the copper-steel junction.

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>NUMERICALS>Q 21

A bar of copper of length

0.75 m

and a bar of stainless steel of length

1.25 m

are joined end to end, each having a cross-sectional area of

101 m^{2}

. The free ends of the copper and the steel bars are maintained at

100 ° C

and

0 ° C

respectively. Calculate the rate of heat transmission across the junction. Thermal conductivities of copper and steel are

400

and

14 J m^{- 1} s^{- 1} K^{- 1}

respectively.

MEDIUM

11th ICSE

IMPORTANT

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

Heat is transmitted from a region of higher temperature to a region of lower temperature through molecular collisions in:

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 2

In the steady state, the temperature of a rod:

EASY

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 3

The rate of heat conduction perpendicular to the surface of a flat plate depends upon:

MEDIUM

11th ICSE

IMPORTANT

ISC Physics Class XI Part 1>Chapter 24 - Thermal Conduction>FOR DIFFERENT COMPETITIVE EXAMINATIONS>Q 4

Which of the following cylindrical rods of the same metal and having same temperature-difference between their ends will conduct heat at the highest rate?

Important Questions on Thermal Conduction

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