Advertisements
Advertisements
प्रश्न
A small gap is left between two iron rails of the railway track. Why?
Advertisements
उत्तर
Gaps are left in the railway tracks because the tracks gets heated during the day and as a result they increase in length. If the gaps are not provided, the railway line would buckle outward and may cause derailment.
APPEARS IN
संबंधित प्रश्न
Explain the following
Water pipes in colder countries often burst in winter.
At 0°C and 760 mm Hg pressure, a gas occupies a volume of 10Q cm3. The Kelvin temperature (Absolute temperature) of the gas is increased by one-fifth while the pressure is increased one and a half times. Calculate the final volume of the gas. [80 cc.]
Why does a piece of ice when touched with hands appear cold?
Define coefficient of linear expansion. Write its SI unit.
State the advantages and disadvantages of mercury and alcohol as thermometric liquids.
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
Define the process of conduction.
Distinguish between heat and temperature.
