All questions of Temperature and its Measurement for Class 6 Exam

On the Kelvin scale, the boiling point of water is 373.15 K.

Understanding Temperature Differences
When we talk about the temperatures of different bodies, the concept of temperature is crucial in understanding how heat is distributed among objects.
Observation of Temperature Variations
The correct answer is option 'B': Some bodies have higher temperatures than others. This observation is fundamental in science and can be explained through several key points:
Heat and Temperature
- Temperature is a measure of how hot or cold an object is.
- It indicates the average kinetic energy of the particles in a substance; the higher the temperature, the more energy the particles have.
Different Materials, Different Temperatures
- Different materials absorb and release heat differently. For example, metal feels colder than wood at the same temperature because metal conducts heat away from your skin more efficiently.
- The same amount of heat can raise the temperature of one material more than another due to differences in specific heat capacity.
Measurement Tools
- Temperature can be measured using various instruments like thermometers, which provide a numerical value to the sensation of warmth or coldness.
- The ability to measure temperature allows us to quantify these differences between bodies.
Real-World Examples
- In everyday life, we can observe this when touching ice (which feels cold) compared to a hot cup of coffee. They have significantly different temperatures.
- Even in the environment, the sun heats some surfaces more than others, leading to variations in temperature.
In summary, recognizing that some bodies have higher temperatures than others is essential to understanding thermal dynamics and the behavior of materials in our world.

Understanding Water Boiling Point
Water boils at a specific temperature depending on the scale used to measure temperature. In the Celsius scale, water boils at 100°C.
Why Does Water Boil at 100°C?
- Boiling Point Definition: The boiling point of a liquid is the temperature at which it changes from a liquid to a gas. For water, this occurs when it reaches 100°C at standard atmospheric pressure (1 atmosphere or 101.3 kPa).
- Molecular Activity: At this temperature, water molecules have enough energy to overcome the forces holding them together in the liquid state. As they gain energy, they move faster and eventually break free to become steam (gas).
Comparison with Other Temperatures
- 0°C: This is the freezing point of water, where it changes from liquid to solid.
- 32°C: This is equivalent to 0°C in the Fahrenheit scale, not relevant for boiling.
- 273°C: This temperature is not standard for boiling water; it relates to absolute zero in Kelvin.
Conclusion
In summary, the correct answer to the question regarding the boiling point of water on the Celsius scale is 100°C. This is a fundamental concept in understanding phase changes in water, which is crucial for various scientific and practical applications.

Body temperature can be influenced by age, activity level, and time of day, but not by eye color.

Digital thermometers use electronic sensors to measure and display the temperature digitally.