MEDIUM
11th West Bengal Board
IMPORTANT
Earn 100

Why do birds puff their feathers out on a cold day?

Important Questions on Heat Transfer

EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 5
Why are motor car radiators provided with metallic fins?
MEDIUM
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 5
A house with a straw roof keeps cool in summer and warm in winter. How?
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 5
In summer the upper surface of water in a tank is warm, but lower surface is cold. In winter, the lower surface of water is hot, but the water at the upper surface is cold. Why?
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 5
Bodies of human beings wrapped up in rugs keep warm in winter but a piece of ice similarly wrapped up keeps cold in summer. Why?
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 5
A stonefloor feels very cold to bare feet in winter but a carpet in the same room feels comfortably warm. Why?
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 5
What should be the nature of the bottom of a cooking vessel - polished or dull, black or white?
EASY
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 6
What is the fastest process for the transmission of heat between conduction, convection and radiation?
HARD
11th West Bengal Board
IMPORTANT
A Text Book of PHYSICS PART I : CLASS 11>Chapter 18 - Heat Transfer>EXERCISE>Q 7
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?