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As we know that, K = Q L A ∆ T t Where, K = thermal conductivity Q = the amount of heat transferred through the material A = the area of the body ∆ T = temperature difference t = time Now, putting unit of these values K = M L 2 T - 2 L L 2 K T or, we can write the dimensional formula for Thermal conductivity M L T - 3 K - 1

E M B I B E

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 7

HARD

11th West Bengal Board

IMPORTANT

Earn 100

What are conductivity and coefficient of thermal conductivity? Is conductivity different for different materials? What is its unit in the CGS and SI system? What is its dimension?

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 8

What is the difference between thermal conductivity and thermal diffusivity.

MEDIUM

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 9

Find the dimensions of thermal conductivity.

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 10

Thermal conductivity of glass is

0.67

S.I.- explain the statement fully.

MEDIUM

11th West Bengal Board

IMPORTANT

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

Two metal bars

A

and

B

of the same size but of different materials are coated with equal thickness of wax and placed each with one end in a hot bath. It is noted that at first the wax on

A

melts at a greater rate than that on

B

but that when a steady state has been reached, a greater length of wax has melted on

B

than on

A

. Explain.

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 12

When a piece of metal cooled by liquid nitrogen (temperature

= - 180 ° C

) is touched, a sensation of scorching is produced. Why?

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 13

In a place near the sea, a breeze blows from the sea to the land in the day time but it blows in the opposite direction at night. Why?

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 14

Two identical metallic cans contain some hot water. The walls of one can are polished while those of the other are blackened. In which can, the water will cool rapidly? Give reasons for your answer.

EASY

11th West Bengal Board

IMPORTANT

A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 15

What do you mean by diathermanous and athermanous bodies?