Advertisements
Advertisements
प्रश्न
Explain the following
Water pipes in colder countries often burst in winter.
उत्तर
On winter nights, as the atmospheric pressure starts falling below 4°C, water in the pipe lines expand and exert a great pressure on the pipes, causing them to burst.
APPEARS IN
संबंधित प्रश्न
Who is telling the truth?
Heat flows from an object at higher temperature to an object at lower temperature.
Which is more, a calorie or a joule?
Two bodies are at same temperature. Do they necessarily contain same amount of heat?
Is it possible to boil water in a thin paper container? Explain with a reason.
A spiral cut from a thick chart paper is pivoted at 0 and is held slightly above a burning candle You will notice that the spiral starts moving. Explain.
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?
For setting curd, a small amount of curd is added to warm milk. The microbes present in the curd help in setting if the temperature of the mixture remains approximately between 35°C to 40°C. At places, where room temperature remains much below the range, the setting of curd becomes difficult. Suggest a way to set curd in such a situation.
Give reasons why –
a steam burn is more damaging than a burn caused by boiling water at the same temperature.
