Chapter 7. Temperature and its Measurement Science Curiosity class 6 in English Medium ncert book solutions Extra Questions Examination Based

Chapter 7. Temperature and its Measurement

Temperature is an important concept in science that helps us understand how hot or cold an object is. In this chapter, students will learn about different types of thermometers, temperature scales, and the correct methods of measuring temperature.

Important Questions with Answers

The following important questions are designed according to the latest CBSE pattern. They cover conceptual understanding, application-based learning, and examination-oriented practice.

1 Mark Questions

Question 1. What is temperature?

Answer: Temperature is the measure of the degree of hotness or coldness of a body.

Question 2. Name the instrument used to measure temperature.

Answer: A thermometer is used to measure temperature.

Question 3. What is the SI unit of temperature?

Answer: The SI unit of temperature is kelvin (K).

Question 4. What is the normal body temperature of a healthy adult in Celsius?

Answer: Approximately 37°C.

Question 5. Which thermometer is used to measure human body temperature?

Answer: A clinical thermometer.

Question 6. Name the thermometer used in science laboratories.

Answer: A laboratory thermometer.

Question 7. Why is our sense of touch not reliable for measuring temperature?

Answer: Our sense of touch depends on previous exposure to hot or cold objects and cannot measure temperature accurately.

Question 8. Which temperature scale is commonly used in daily life?

Answer: The Celsius scale (°C).

Question 9. What type of thermometer became popular during the COVID-19 pandemic?

Answer: An infrared (non-contact) thermometer.

Question 10. Why are digital thermometers preferred over mercury thermometers?

Answer: They are safer, easier to read, and do not contain toxic mercury. :contentReference[oaicite:0]{index=0}

2 Marks Questions

Question 1. Differentiate between a clinical thermometer and a laboratory thermometer.

Answer:

Question 2. Why should a thermometer be cleaned before and after use?

Answer:

• To maintain hygiene.
• To prevent the spread of germs from one person to another.

Question 3. Write any two precautions while using a laboratory thermometer.

Answer:

• Keep the thermometer vertical.
• The bulb should not touch the sides or bottom of the container.

Question 4. Name the three commonly used temperature scales.

Answer:

• Celsius Scale
• Fahrenheit Scale
• Kelvin Scale

Question 5. Why is a laboratory thermometer not suitable for measuring body temperature?

Answer:

• It is designed for experiments, not for the human body.
• Its reading changes immediately after it is removed from the object being measured.

3 Marks Questions

Question 1. Explain why touching an object is not always a correct way to judge its temperature.

Answer:

Our skin senses temperature relatively rather than absolutely. If one hand is kept in hot water and the other in cold water, the same lukewarm water feels cold to one hand and warm to the other. Therefore, our sense of touch cannot accurately determine temperature. A thermometer should always be used for reliable measurement.

Question 2. Explain the correct method of measuring body temperature using a digital clinical thermometer.

Answer:

• Wash the thermometer tip before use.
• Switch on or reset the thermometer.
• Place it under the tongue (or in the armpit when required).
• Wait for the beep.
• Read the displayed temperature.
• Clean the thermometer after use.

Question 3. Explain the correct method of using a laboratory thermometer.

Answer:

• Immerse only the bulb in the liquid.
• Hold the thermometer vertically.
• Do not let the bulb touch the container.
• Read the temperature while the thermometer is still inside the liquid.
• Keep your eye level with the liquid column.

Question 4. Explain the importance of measuring temperature accurately.

Answer:

Accurate temperature measurement is essential for diagnosing illnesses, conducting scientific experiments, preparing weather forecasts, maintaining food safety, industrial production, and many daily-life activities. Incorrect measurements may lead to wrong decisions and unsafe situations.

Question 5. Compare Celsius, Fahrenheit and Kelvin scales.

Answer:

Long Answer Questions

Question 1. Explain the different types of thermometers and their uses.

Answer:

Different thermometers are designed for different purposes.

• Clinical Thermometer: Used for measuring human body temperature.
• Digital Clinical Thermometer: Gives quick and safe electronic readings.
• Laboratory Thermometer: Measures temperatures of liquids and other materials during experiments.
• Room Thermometer: Measures surrounding air temperature.
• Infrared Thermometer: Measures temperature without touching the body.

Each thermometer is specially designed for its particular purpose, so the correct thermometer should always be used.

Question 2. Describe the precautions to be followed while using a laboratory thermometer.

Answer:

• Handle it carefully because it is made of glass.
• Do not hold it by the bulb.
• Keep it vertical.
• The bulb should not touch the container.
• Read the temperature while it is immersed.
• Take the reading at eye level to avoid parallax error.

Question 3. Explain why digital thermometers have replaced mercury thermometers.

Answer:

Earlier, mercury thermometers were commonly used to measure body temperature. However, mercury is highly poisonous and may cause health and environmental hazards if the thermometer breaks. Digital thermometers use electronic heat sensors instead of mercury. They provide faster readings, are easier to read, safer for children, more hygienic, and require less maintenance. These advantages have made digital thermometers the preferred choice in homes and hospitals. :contentReference[oaicite:1]{index=1}

Question 4. Explain the importance of temperature measurement in daily life.

Answer:

Temperature measurement plays a vital role in our everyday life. Doctors use thermometers to detect fever and monitor patients. Scientists depend on accurate temperature readings during experiments. Weather departments measure air temperature to prepare forecasts. Industries monitor temperature during manufacturing processes. Refrigerators preserve food at suitable temperatures, while farmers and environmental scientists study temperature changes to improve agriculture and understand climate. Thus, accurate temperature measurement supports health, science, safety, and modern technology.

Question 5. Describe the three temperature scales used in science.

Answer:

The three commonly used temperature scales are Celsius, Fahrenheit, and Kelvin.

• Celsius Scale (°C): Most commonly used in schools, homes, and laboratories.
• Fahrenheit Scale (°F): Used mainly in a few countries for weather and body temperature.
• Kelvin Scale (K): The SI unit of temperature used in scientific research. Unlike Celsius and Fahrenheit, the Kelvin scale does not use the degree symbol.

Each scale measures the same physical quantity but uses different reference points and units.

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