Advertisements
Advertisements
प्रश्न
Why are gaps left between successive rails on a railway track ?
Advertisements
उत्तर
The rails of railway track are made of steel. While laying the railway track, a small gap is left between the two successive length of rails. The reason is that the rails expand in summer. The gap is provided to allow for this expansion. If no gap is left, the expansion in summer will cause the rails to bend sideways. This may result in a train accidents.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
_________ determines the degree of hotness or coldness of a body.
Fill in the blank
We use a ________ for measuring the temperature of a body.
Select the correct alternative
Which of the statement is correct
The fig. shows a glass tumbler containing hot milk which is placed in a tub of cold water. State the direction in which heat will flow.
State one application of thermal expansion of liquids.
An empty glass bottle is fitted with a narrow tube at its mouth. The open end of the tube is kept in a beaker containing water. When the bottle is heated, bubbles of air are seen escaping into the water. Explain the reason.
Why do we use cooking utensils made up of copper.
During day time, air blows from ______ to ______.
Mention the factors affecting the flow of heat.
When heat energy is added to a substance, the kinetic energy of its particles ______ and so the particles move at a higher speed.
