12-Minute Test: Temperature and its Measurement - Class 6 MCQ

A digital thermometer uses heat sensors to measure temperature. These thermometers are quick, safe, and easy to read because they display the temperature on a digital screen. Unlike mercury or alcohol thermometers, digital thermometers do not contain harmful substances and are more commonly used today.

Eye color does not affect body temperature. However, factors like age, activity level, and time of day can influence body temperature. For example, body temperature may be slightly different for young children or older adults, and it can vary depending on whether you're active or resting, or what time of day it is.

A laboratory thermometer is commonly used to measure the temperature of liquids and other substances in scientific experiments. It is designed to accurately measure temperature in various laboratory settings.

On the Celsius scale, water boils at 100°C. This is the temperature at which water changes from a liquid to a gas (vapor).

A barometer is used to measure atmospheric pressure, not temperature. Clinical thermometers, mercury thermometers, and laboratory thermometers are all used to measure temperature.

Laboratory thermometers commonly use alcohol (often colored red) or mercury as the liquid inside the thermometer. These liquids expand and contract with temperature changes, allowing the thermometer to measure the temperature accurately.

The normal body temperature of a healthy human adult is around 37°C, although slight variations can occur depending on factors like time of day, activity level, and age.

The boiling point of water is 100°C on the Celsius scale. To convert Celsius to Kelvin, you add 273.15:

• 100°C + 273.15 = 373.15 K
  So, the boiling point of water on the Kelvin scale is 373.15 K.
• Option A (273.15 K) is the freezing point of water (0°C), not the boiling point.
• Option C (273.15°C) is a Celsius value, not Kelvin.
• Option D (373.15°F) is Fahrenheit, not Kelvin.
  Only B is correct.

The Kelvin scale is most commonly used in scientific work. It starts at absolute zero and is used in many areas of science, especially physics.

Correct Answer: B. Some bodies have higher temperatures than others.

In the chapter "Temperature and its Measurement," we learn that temperature tells us how hot or cold something is. When you touch different things, like a cup of hot water and a cup of cold water, you can feel that one is warmer than the other. This shows that some things are hotter, and others are cooler. The chapter talks about how we can measure these differences in temperature using tools like thermometers. So, the correct answer is that some bodies (like water, air, or objects) are hotter than others.