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प्रश्न
Who am I?
Land and water get heated due to me.
उत्तर
Sunrays
संबंधित प्रश्न
Draw a neat labelled diagram of a laboratory thermometer.
Convert – 40°F to the Celsius scale.
Name two substances which expand on heating.
Why does a substance expand on heating?
Why are bridges made of steel girders put on rollers?
The hot metal ball is suspended from a string in a metal box as shown in the following figure
(i) What are the ways in which the ball loses heat
(ii) Which side of the box will be the hottest and which the least hot after some time? Explain.
Analogy
Heat : Joule :: Temperature : _____
When a window is accidentally left open on a winter night, will you feel uncomfortable because the cold is getting in, or because the heat is escaping from the room?
The dimensions of a substance are increased if the temperature of the substance is decreased.
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.
Temperature is the average ______ of the molecules of a substance.
When we cool the object the temperature of the object will be increased.
A small change in the temperature causes change in ______ of a liquid.
Heat energy flows from a body at a low temperature to a body at a higher temperature.
Match the following:
| Column-I | Column-II | |
| 1. | Temperature | Beam balance |
| 2. | Mass | Ruler |
| 3. | Length | Digital clock |
| 4. | Time | Thermometer |
Give reasons why –
chimneys are located high up in kitchens and factories
Define absolute zero.
