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
How is the size of a degree defined on a Celsius scale ?
Two bodies at different temperatures are placed in contact. State the direction in which the heat will flow.
Is conduction possible in vacuum?
Define coefficient of volume 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.
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
Out of metals, liquids, and gases:
Which one is the best conductor of heat?
One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be
