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प्रश्न
Name three devices which are used to detect heat radiations.
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उत्तर
Three devices used to detect heat radiations are
(a). Blackened bulb thermometer
(b). Differential air thermo scope
(c). Thermopile
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संबंधित प्रश्न
Define temperature on a conventional basis.
State two uses of a bimetallic strip.
Convert the following temperature into Fahrenheit scale:
1000C
Give a scientific reason for the following:
In winter the human body covered with a blanket keeps warm.
Explain the following:
Why is the cooling in a refrigerator kept near the top?
The following figure shows a rectangular box with two tubes P and Q at the top. A burning candle R is placed under the tube P. The candle burns brightly.
Explain:
(i) How is the air in the box circulating?
(ii) What will happen if the opening Q is closed?
Kelvin is written as K also known as absolute scale as it starts from absolute zero temperature.
Match the following:
| Column-I | Column-II | |
| 1. | Length | s |
| 2. | Mass | m |
| 3. | Time | k |
| 4. | Temperature | kg |
