Advertisements
Advertisements
Question
Explain why rails have gaps at specific distances.
Solution
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.
RELATED QUESTIONS
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.
Who is telling the truth?
Atoms of a solid are free.
Who is telling the truth?
The average kinetic energy of atoms in a hot object is less than the average kinetic energy of atoms in a cold object.
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.
Analogy
Total Kinetic Energy of molecules: Heat :: Average Kinetic Energy : ______.
Make a list of electrical equipments at home which we get heat from.
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 |
