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11th West Bengal Board

IMPORTANT

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One end of a metal rod is kept in a boiling water and the other end in melting ice

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Important Questions on Heat Transfer

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 26

Why metals are good conductors of heat ?

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 27

Why Cork is a good insulator.

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 28

Three rods made of same material and having same cross-section have been joined as shown in figure. Each rod has same length. The left and right ends are kept at

0 ° C

and

90 ° C

respectively. What is the temperature of the junction of the three rods will be?

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MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 29

1.56 \times 10^{5} J

of heat is conducted through a

2 m^{2}

wall of

12 cm

thickness in one hour. Temperature difference between the two sides of the wall is

20 ° C

. The thermal conductivity of the material of the wall is (in

{Wm}^{- 1} k^{- 1}

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 30

Three identical rods

A, B

and

C

are placed end to end.

A

temperature difference is maintained between the free ends of

A

and

C

. The thermal conductivity of

B

is thrice that of

C

and half of that of

A

. The effective thermal conductivity of the system will be (

K_{A}

is the thermal conductivityof rod

A

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 31

Two rods of equal lengths and areas of cross-section are kept parallel and hanged between temperatures

20 ° C

and

80 ° C

. The ratio of their effective thermal conductivity to that of the first rod is ( the ratio

= \frac{K_{1}}{K_{2}} = \frac{3}{4}

)

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 32

A long metallic bar is carrying heat from one of its ends to the other end under steady state. The variation of temperature

θ

along the length

x

of the bar from its hot end is best described by which of the following figures?

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 33

One end of a thermally insulated rod is kept at a temperature

T_{1}

and the other at

T_{2}

, Fig. The rod is composed of two sections of length

l_{1}

and

l_{2}

and thermal conductivities

K_{1}

and

K_{2}

respectively. The temperature at the interface of the two sections is

One end of a metal rod is kept in a boiling water and the other end in melting ice

Important Questions on Heat Transfer

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