The chapter, Temperature and its Measurement,introduces students to temperature and how we measure it. It begins with the story of Lambok and his sister Phiban, who live in Shillong. Lambok feels unwell and Phiban places her hand on his forehead and suspects he has a fever. She gets a thermometer to check and it shows his temperature is perfectly normal. Our sense of touch tells us one thing, but a scientific instrument tells us something completely different. Touch was wrong and understanding why it was wrong is the core of the chapter.
Through a three-container activity with warm water, room-temperature water,and ice-cold water, students discover that the same container of water can feel warm to one hand and cool to the other at the same time, depending on what each hand was in before. This proves that touch is unreliable for measuring temperature and that a consistent, objective tool is needed. That tool is the thermometer. NCERT Solutions for Class 6 Science for this chapter cover all in-text, activity-based and back exercise questions, which include MCQs, fill in the blanks, short answer and long answer questions, helping CBSE Board Class 6 students prepare for every question type that can be asked in the exams.
Download NCERT Solutions for Class 6 Science Chapter 7 PDF
Download the NCERT Solutions for Class 6 Science Chapter 7 Temperature and its Measurement PDF for free and study anytime, anywhere. These solutions provide accurate, step-by-step answers to all NCERT exercise questions in simple language. Use this PDF to revise important concepts such as temperature scales, thermometers, laboratory and clinical thermometers, and temperature measurement while preparing confidently for your school exams.
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NCERT Exercise Solutions for Class 6 Science Chapter 7 Temperature and its Measurement
NCERT Solutions for Class 6 Science Chapter 7 given below cover all the questions in this chapter. These solutions are prepared according to the latest CBSE Board Class 6 syllabus and are designed to help students understand the concepts clearly and write accurate and well-structured answers. By practicing these solutions regularly, students can improve their understanding of the chapter and prepare confidently for school tests and exams.
Q1. The normal temperature of a healthy human being is close to ______.
(i) 98.6 °C
(ii) 37.0 °C
(iii) 32.0 °C
(iv) 27.0 °C
Answer: (ii) 37.0 °C
Explanation: The normal body temperature of a healthy person is 37.0 °C, which is equal to 98.6 °F.
Q2. 37 °C is the same temperature as ______.
(i) 97.4 °F
(ii) 97.6 °F
(iii) 98.4 °F
(iv) 98.6 °F
Answer: (iv) 98.6 °F
Explanation: A body temperature of 37 °C is equal to 98.6 °F, which is considered the normal body temperature of a healthy adult.
Q3. Fill in the blanks.
(i) The hotness or coldness of a system is determined by its ______.
Answer: Temperature
(ii) The temperature of ice-cold water cannot be measured by a ______ thermometer.
Answer: Clinical
(iii) The unit of temperature is degree ______.
Answer: Celsius (°C)
Q4. The range of a laboratory thermometer is usually ______.
(i) 10 °C to 100 °C
(ii) –10 °C to 110 °C
(iii) 32 °C to 45 °C
(iv) 35 °C to 42 °C
Answer: (ii) –10 °C to 110 °C
Explanation: A laboratory thermometer has a wide temperature range because it is used to measure the temperature of different substances during science experiments.
Q5. Four students used a laboratory thermometer to measure the temperature of water as shown in Fig. 7.6. Who do you think followed the correct way for measuring temperature?
(i) Student 1
(ii) Student 2
(iii) Student 3
(iv) Student 4
Answer: (ii) Student 2
Explanation: Student 2 is using the laboratory thermometer correctly because:
The thermometer is kept upright (vertical).
The bulb is completely dipped in the water.
The bulb does not touch the sides or the bottom of the container.
These are the correct precautions while using a laboratory thermometer.
Q6. Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below.
14 °C
17 °C
7.5 °C
Answer: This is an activity-based question. Colour the red column of each thermometer up to the given temperature.
First thermometer: Colour up to 14 °C.
Second thermometer: Colour up to 17 °C.
Third thermometer: Colour up to 7.5 °C, which is halfway between 7 °C and 8 °C.
Q7. Observe the part of thermometer shown in Fig. 7.8 and answer the following questions.
(i) What type of thermometer is it?
Answer: It is a laboratory thermometer.
(ii) What is the reading of the thermometer?
Answer:
The thermometer shows 18 °C.
(iii) What is the smallest value that this thermometer can measure?
Answer: The smallest value that this thermometer can measure is 1 °C.
Q8. A laboratory thermometer is not used to measure our body temperature. Give a reason.
Answer: A laboratory thermometer is not used to measure body temperature because it does not have a kink (constriction). As soon as it is removed from the body, the liquid level falls quickly, making it difficult to read the temperature accurately.
A clinical thermometer is used to measure body temperature because it has a kink that holds the reading for some time.
Q9. Vaishnavi has not gone to school as she is ill. Her mother has kept a record of her body temperature for three days as shown in Table 7.4.
(i) What was Vaishnavi's highest recorded temperature?
Answer: The highest recorded temperature was 40.0 °C.
(ii) On which day and at what time was Vaishnavi's highest temperature recorded?
Answer: Her highest temperature was recorded on Day One at 7:00 pm.
(iii) On which day did Vaishnavi's temperature return to normal?
Answer: Her temperature returned to normal on Day Three, when it gradually came down to around 37 °C.
Q10. If you have to measure the temperature 22.5 °C, which of the following three thermometers will you use (Fig. 7.9)? Explain.
Answer: I would use Thermometer (b).
Explanation: Thermometer (b) has smaller divisions, so it can measure temperatures with greater accuracy. Since 22.5 °C lies halfway between 22 °C and 23 °C, a thermometer with finer divisions is the most suitable choice.
Q11. The temperature shown by the thermometer in Fig. 7.10 is
(i) 28.0 °C
(ii) 27.5 °C
(iii) 26.5 °C
(iv) 25.3 °C
Answer: (ii) 27.5 °C
Explanation: The liquid level is halfway between 27 °C and 28 °C. Therefore, the correct temperature reading is 27.5 °C.
Q12. A laboratory thermometer has 50 divisions between 0 °C and 100 °C. What does each division of this thermometer measure?
Answer: Temperature range = 100 °C − 0 °C = 100 °C
Number of divisions = 50
Value of one division:
100 ÷ 50 = 2 °C
Answer: Each division of the thermometer measures 2 °C.
Q13. Draw the scale of a thermometer in which the smallest division reads 0.5 °C. You may draw only the portion between 10 °C and 20 °C.
Answer: This is a drawing-based activity.
Draw a thermometer scale from 10 °C to 20 °C and divide each 1 °C interval into two equal parts.
The markings should be:
10, 10.5, 11, 11.5, 12, 12.5, 13, 13.5, 14, 14.5, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20
This makes the smallest division equal to 0.5 °C.
Q14. Komal tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?
Answer: Komal is referring to 101 °F (Fahrenheit).
A body temperature of 101 °F indicates a fever and is common during illness.
If it were 101 °C, it would be much higher than the boiling point of water and is not possible for a human body.
Therefore, Komal means 101 °F, not 101 °C.
Class 6 Science Chapter 7 Temperature and its Measurement Overview
The chapter starts with an activity that shows why the sense of touch cannot be used to measure temperature accurately. Students place one hand in warm water and the other in cold water before putting both hands into a container of room-temperature water. One hand feels the water as cold, while the other feels it as warm. This demonstrates that the sense of touch is relative and unreliable for measuring temperature. The chapter discusses the three commonly used temperature scales: Celsius (°C), Fahrenheit (°F) and Kelvin (K). It explains that Kelvin is the SI unit of temperature and is written without the degree symbol.
Students also learn the relationship between the Celsius and Kelvin scales using the formula K = °C + 273.15. The chapter explains standard temperatures such as the melting point of ice (0 °C), the boiling point of water (100 °C) and the normal human body temperature (37.0 °C or 98.6 °F). Students learn about the clinical thermometer, which is used to measure human body temperature. The chapter explains its range (35 °C to 42 °C), its kink or constriction that prevents the liquid from falling back immediately and the normal body temperature of a healthy adult.
It also discusses digital and infrared thermometers, explaining how infrared thermometers became widely used during the COVID-19 pandemic because they could measure temperature without touching the body. The chapter also explains the laboratory thermometer and how it differs from a clinical thermometer. A laboratory thermometer has a wider range, usually from −10 °C to 110 °C, does not have a kink and is used to measure the temperature of different substances during experiments.
Students also learn the correct precautions for using a laboratory thermometer, such as keeping it upright, ensuring the bulb is fully surrounded by the substance being measured and reading the scale at eye level. The chapter also explains air temperature as the measure of the warmth or coolness of the air and its importance in weather reports. In the end, it discusses the contributions of Anna Mani, the "Weather Woman of India," whose work in developing weather instruments helped advance meteorological research in India.
Topics Covered in This Chapter
- Why the sense of touch is unreliable for judging temperature: the three-container activity.
- Definition of temperature.
- The scales of temperature: Celsius, Fahrenheit and Kelvin.
- The SI unit of temperature.
- The Celsius to Kelvin conversion formula.
- Normal human body temperature: 37.0 °C or 98.6 °F.
- Thermometers: the clinical thermometer, the infrared thermometer and the laboratory thermometer.
- Difference between clinical and laboratory thermometers.
- Reading a thermometer scale.
- Choosing the right thermometer for a given situation.
- Precautions for using a laboratory thermometer correctly.
- Air temperature and its role in weather reports.
- Anna Mani: the Weather Woman of India and her contributions to meteorological instruments.
How to Prepare for This Chapter Using NCERT Solutions?
For Chapter 7, start by reading the NCERT textbook throughly and focus first on understanding why touch fails as a measuring tool. You should perform the three-container activity to understand the core concept of the chapter, as it will help you realise why our sense of touch cannot measure temperature accurately. If you are unsure about any textbook question, use the NCERT Solutions to understand the correct reasoning after attempting it yourself. Next, learn the differences between the clinical thermometer and the laboratory thermometer. Learn their ranges, the presence or absence of a kink, their uses and the precautions for each.
While studying temperature scales and thermometers, remember that the SI unit of temperature is Kelvin, written as K, without a degree sign. Students very commonly write Celsius as the SI unit, which is incorrect. The Celsius scale is the everyday scale, but Kelvin is the internationally recognized SI unit used in all scientific work. For the numerical questions on reading thermometer scales, practice the formula regularly. Divide the total range by the total number of divisions to get the value of each division. Then use that value to read any marked point on the scale. Practice this with multiple values.
Students often confuse the Celsius and Fahrenheit scales while writing fever temperatures. You should always remember that a fever of 101 degrees refers to the Fahrenheit scale. If it were 101 °C, it would be above the boiling point of water and is impossible for a living human body. Therefore, a fever of 101 degrees always refers to the Fahrenheit scale, where it translates to approximately 38.3 °C, which is a common fever temperature. Understanding this logic will help you avoid one of the most common mistakes in school exams.
After completing the chapter, practice all NCERT textbook questions yourself before checking the solutions. For Class 6 Temperature and its Measurement MCQs, the most frequently asked questions are the normal human body temperature in both Celsius and Fahrenheit, the range of the clinical thermometer, the range of the laboratory thermometer, the SI unit of temperature, the purpose of the kink, why a laboratory thermometer cannot be used to measure body temperature and the Celsius to Kelvin conversion.
Benefits of Studying this Chapter
Understanding Temperature: This chapter helps students understand why touch cannot be used to measure temperature accurately and explains the need for thermometers. The three-container activity demonstrates this concept in a simple way, building a strong scientific understanding of temperature.
Learning About Thermometers: Students learn the differences between clinical and laboratory thermometers, including their ranges, uses, the presence or absence of a kink and the precautions that must be followed while using them. These are important practical concepts used in science and everyday life.
Improving Measurement Skills: Students learn how to read thermometer scales by calculating the value of each division and interpreting temperature readings correctly. They also understand the difference between the Celsius and Fahrenheit scales, including why a fever of 101 degrees refers to the Fahrenheit scale and not Celsius.
Learning Scientific Units: The chapter explains that Kelvin (K) is the SI unit of temperature, while Celsius is the scale commonly used in daily life. Understanding the difference between these temperature scales helps students build a strong foundation for higher classes and prevents common mistakes.
Building a Strong Foundation: The concepts covered in this chapter form the basis for future topics related to heat, temperature and thermometers. The practical knowledge gained is useful in laboratory work, everyday life and school examinations, making this an important foundation chapter in Class 6 Science
