NCERT Class 6 Science Chapter 7: Temperature and its Measurement Solutions by PW

You may describe an object as hot or cold by touching it, but your sense of touch cannot tell you its exact temperature. To measure temperature correctly, you need a thermometer and must know how to read its scale and use it properly.

PW Class 6 Science Chapter 7 Solutions help you work through questions from Temperature and its Measurement. The solutions cover normal body temperature, clinical and laboratory thermometers, Celsius and Fahrenheit scales, thermometer readings, smallest divisions, and correct measurement methods.

Class 6 Science Chapter 7 Solutions

The PW Class 6 Science Chapter 7 Solutions include direct, numerical, figure-based, and reasoning questions. Try each question first and then use the solutions to check whether you have understood the measurement and thermometer concepts correctly.

Question 1: The normal temperature of a healthy human being is close to:

(a) 98.5°C
(b) 37°C
(c) 32°C
(d) 27°C

Answer: (b) 37°C

The normal body temperature of a healthy human being is approximately 37°C or 98.6°F, although it can vary slightly from person to person.

Question 2: 37°C is the same temperature as:

(a) 97.4°F
(b) 97.6°F
(c) 98.4°F
(d) 98.6°F

Answer: (d) 98.6°F

To convert Celsius into Fahrenheit:

°F = °C × 9/5 + 32

Therefore,

37 × 9/5 + 32 = 98.6°F

Question 3: 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

Question 4: The range of a laboratory thermometer is usually:

(a) 10°C–100°C
(b) −10°C–110°C
(c) 32°C–45°C
(d) 35°C–42°C

Answer: (b) −10°C–110°C

A laboratory thermometer can measure a wider range of temperatures, making it suitable for different substances and experiments.

Question 5: Four students use a laboratory thermometer to measure the temperature of water. Who follows the correct method?

Answer: Student 2

The thermometer should be held vertically, immersed to the required level, and should not touch the sides of the container. The figure in the source shows Student 2 following these conditions correctly.

Question 6: Observe the thermometer shown in the figure and answer the following.

(i) What type of thermometer is it?
Answer: Laboratory thermometer

(ii) What is its reading?
Answer: 26°C

(iii) What is the smallest value that it can measure?
Answer: 1°C

The scale shown in the source has ten divisions across a 10°C interval, making each division equal to 1°C.

Question 7: Why is a laboratory thermometer not used to measure body temperature?

Answer: A laboratory thermometer is designed to measure a much wider range of temperatures, typically from −10°C to 110°C, and is not designed for convenient measurement of human body temperature. Clinical thermometers are designed specifically for this purpose and are easier and safer to use.

Question 8: Vaishnavi’s body temperature was recorded for three days. What was her highest recorded temperature?

Answer: Her highest recorded temperature was 40.0°C. According to the table, this temperature was recorded on Day One at 7 p.m.

Question 9: On which day did Vaishnavi’s temperature return to normal?

Answer: Her temperature returned to normal on Day Three at 4 p.m., when the recorded temperature was 37.0°C.

Question 10: If you have to measure a temperature of 22.5°C, which of the three thermometers shown in the figure would you use?

Answer: Thermometer (b) would be the most suitable.

Its smaller scale divisions allow a more precise reading of 22.5°C. The other thermometers have larger divisions, making it difficult to measure this specific temperature accurately.

Question 11: What is the temperature shown by the thermometer in the figure?

(a) 28°C
(b) 27.5°C
(c) 26.5°C
(d) 25.3°C

Answer: (b) 27.5°C

Question 12: A laboratory thermometer has 50 divisions between 0°C and 100°C. What does each division measure?

Answer:

Total temperature range = 100°C − 0°C = 100°C

Number of divisions = 50

Therefore,

Value of each division = 100 ÷ 50 = 2°C

So, each division measures 2°C.

Class 6 Science Chapter 7 Solutions PDF

The Class 6 Science Chapter 7 Solutions PDF brings the chapter questions and answers together for revision. You can use it to revisit thermometer types, body temperature, temperature scales, correct measurement methods, and numerical questions involving thermometer readings.

Continue Your Class 6 Science Preparation with PW Resources

After completing Temperature and its Measurement, you can use other PW Class 6 Science resources to revise concepts and practise different types of questions.

• Class 6 Science Syllabus – Check the complete Science syllabus and keep track of the chapters and topics you need to cover.

• PW Class 6 Science Notes – Revise chapter concepts before attempting more questions.

• PW Class 6 Science Solutions – Continue solving textbook exercises from other Science chapters.

• Class 6 Science Important Questions – Practise additional chapter-based questions to check your understanding and application of Science concepts.

• Class 6 Science Sample Papers – Combine questions from different chapters and practise answering them in an exam-style format.

The PW Class 6 Science Chapter 7 Solutions can help you move beyond simply identifying whether something is hot or cold. As you revise, focus on choosing the correct thermometer, reading its scale carefully, and understanding why proper measurement is more reliable than your sense of touch. Pay particular attention to figure-based and numerical questions, as these require you to apply the concepts rather than only recall them.

Also Check: PW Class 6 Science Solutions