Advertisements
Advertisements
प्रश्न
Give reason for the following
The electric wire which sag in summer become straight in winter.
Advertisements
उत्तर
In summer the electric wire is expanded by high temperature. So it sags in summer. In winter die electric wire is contracted by low temperature. Hence it becomes straight in winter.
APPEARS IN
संबंधित प्रश्न
What is meant by the term temperature.
What is the Fahrenheit scale of temperature ?
Why does a piece of ice when touched with a hand, appear cool? Explain.
What is the unit of coefficient of linear expansion?
One liter of mercury at 100C is heated to 300C. Find the increase in the volume of mercury. The coefficient of cubical expansion of mercury is 1.8 X 10-4 0C-1.
What is meant by the lower and upper fixed points of a thermometer?
The following figure shows a copper washer. Explain, giving reasons, whether the following characteristics of the washer increase, decrease, or remain the same when it is heated.
(a) Internal diameter
(b) Volume
(c) Mass
(d) Density
(e) External diameter
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?
Mention the three units which are used to measure the temperature.
Which factor determines the direction of flow of heat from one body to another?
