Advertisements
Advertisements
प्रश्न
Explain why rails have gaps at specific distances.
Advertisements
उत्तर
All solids expand on heating. As rails are made up of steel, these also expand in summers and contract in winters. This expansion and contraction can cause sagging and bending of rails which could derail the trains running on them. Thus, the rails have been provided with gaps at a specific distance so as to prevent this bending of rails. These spaces get closer in summers and wider in winters.
संबंधित प्रश्न
Whom should I Pair with?
| Group A | Group B | ||
| a. | Temperature of a healthy human body | i. | 296 K |
| b. | Boiling point of water | ii. | 98.6°F |
| c. | Room temperature | iii. | 0°C |
| d. | Freezing point of water | iv. | 212∘F |
Who is telling the truth?
Objects contract on heating.
The apparatus used to measure heat is called a ______.
The heat contained in a substance is the measures of the ______ kinetic energy of atoms in the substance.
At 15∘C the height of Eifel tower is 324 m. If it is made of iron, what will be the increase in length in cm, at 30∘C?
Steam is formed when heat is released from water.
Make a list of electrical equipments at home which we get heat from.
When ______ flows through a conductor, heat energy is produced.
Match the following:
| 1. | Source of heat | a. | heat energy |
| 2. | Electric current | b. | calorie |
| 3. | Gasoline | c. | 37°C |
| 4. | Unit of heat | d. | Electric kettle |
| 5. | Human body temperature | e. | sun |
List and describe the sources of heat.
