Advertisements
Advertisements
प्रश्न
Give reasons for the following:
Telephone wires sag in summer.
Advertisements
उत्तर
Telephone wires sag in summer because due to heat of the sun, the wire expands and increases in length, thus they sag in summer.
APPEARS IN
संबंधित प्रश्न
Kerosene contracts on heating.
A longer rod expands ........... than a shorter rod on being heated to the same temperature.
An iron washer is heated. State the effect on its internal diameter.
Give scientific reason.
An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.
Give scientific reason.
The telephone wires which sag in summer become straight in winter.
Define the following term:
Coefficient of superficial expansion
Complete the following sentence:
When ice melts its volume ______ and density _______.
Thermal expansion is always a nuisance.
When the vibrations move from one molecule to another molecule heat will flow.
