Advertisements
Advertisements
प्रश्न
Select the correct alternative
The vacuum kept in between the walls of a thermos flask reduces the heat transfer by
विकल्प
conduction only
convection only
radiation only
conduction and convection
Advertisements
उत्तर
conduction and convection
APPEARS IN
संबंधित प्रश्न
Write true or false for a given statement.
Medium is necessary for the transfer of heat by radiation.
Fill in the blank
A hot metallic piece is placed in tap water contained in a bucket. Heat will flow from _______ to _________
Fill in the blank
Heat transfer in liquids and gases is by ________.
Select the correct alternative
In the process of convection, heat travel
Maximum heat is absorbed by a ______ coloured object.
Match the items in column-I to the items in column-II
| Column-I | Column-II | ||
| 1. | Linear expansion | (a) | change in volume |
| 2. | Superficial expansion | (b) | hot body to cold body |
| 3. | Cubical expansion | (c) | 1.381 X 10-23 JK-1 |
| 4. | Cubical expansion | (d) | change in length |
| 5. | Boltzmann constant | (e) | change in area |
The handles of cooking utensils are made of ______.
Heat is the transfer of energy between two objects at different temperatures.
When ice changes into a liquid, it absorbs energy.
Wrap a thin paper strip tightly around an iron rod. Try to burn the paper with candle while rotating the iron rod continuously. Does it burn? Explain your observation.
