Advertisements
Advertisements
प्रश्न
Give a scientific reason for the following:
In winter the birds fluff up their feathers.
Advertisements
उत्तर
In winter the birds fluff their feathers in order to trap air in their feathers so that the air provides heat insulation to their body from the surroundings and keeps them warm and saves them from winter.
APPEARS IN
संबंधित प्रश्न
A given mass of water is cooled from 10°C to 0°C. State the volume changes you will observe. Represent these changes on a temperature-volume graph.
S.I. unit of temperature is :
Fill in the blank with the correct word, from the words in option:
All the temperature on the kelvin scale are in ____ figures.
Define calorie. How many joules make one calorie?
Define temperature and write its SI unit.
What is the principle of the thermometer?
The following figure shows a container in which a lighted candle has been kept. The container has two openings, p, and Q. Which way the smoke from an external source placed near P moves when it reaches P and leaves from Q. Give a reason for your answer.
One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be
Assertion: When water is heated up to 100°C, there is no raise in temperature until all water gets converted into water vapour.
Reason: Boiling point of water is 10°C.
Match the following:
| Column-I | Column-II | |
| 1. | Temperature | Beam balance |
| 2. | Mass | Ruler |
| 3. | Length | Digital clock |
| 4. | Time | Thermometer |
