Chapter 7. Temperature and its Measurement Science Curiosity class 6 in English Medium ncert book solutions NCERT TextBook Questions With Answers

Chapter 7. Temperature and its Measurement

NCERT Textbook Exercise

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

Options:

• (A) 98.6 °C
• (B) 37.0 °C
• (C) 32.0 °C
• (D) 27.0 °C

Answer: (B) 37.0 °C

Explanation: The average normal body temperature of a healthy human being is about 37°C, which is equivalent to 98.6°F. However, slight variations may occur depending on age, activity, and time of the day. :contentReference[oaicite:0]{index=0}

Question 2. 37°C is the same temperature as __________.

Options:

• (A) 97.4°F
• (B) 97.6°F
• (C) 98.4°F
• (D) 98.6°F

Answer: (D) 98.6°F

Explanation: Celsius and Fahrenheit are two commonly used temperature scales. A body temperature of 37°C is equal to 98.6°F. :contentReference[oaicite:1]{index=1}

Question 3. Fill in the blanks.

(i) The hotness or coldness of a system is determined by its __________________.

Answer: temperature

Explanation: Temperature tells us how hot or cold an object is compared with another object.

(ii) The temperature of ice-cold water cannot be measured by a __________________ thermometer.

Answer: clinical

Explanation: A clinical thermometer is designed only for measuring human body temperature. Ice-cold water is outside its measuring range. :contentReference[oaicite:2]{index=2}

(iii) The unit of temperature is degree __________________.

Answer: Celsius

Explanation: The commonly used unit for measuring temperature is degree Celsius (°C).

Question 4. The range of a laboratory thermometer is usually __________.

Options:

• (A) 10°C to 100°C
• (B) –10°C to 110°C
• (C) 32°C to 45°C
• (D) 35°C to 42°C

Answer: (B) –10°C to 110°C

Explanation: Laboratory thermometers have a much wider range than clinical thermometers and are suitable for measuring the temperatures of different substances. :contentReference[oaicite:3]{index=3}

Question 5. Four students used a laboratory thermometer to measure the temperature of water as shown in the figure. Who followed the correct method?

Options:

• (A) Student 1
• (B) Student 2
• (C) Student 3
• (D) Student 4

Answer: (C) Student 3

Explanation:

• The thermometer should be held vertically.
• The bulb should remain immersed in water.
• The bulb should not touch the sides or bottom of the container.
• The reading should be taken while the thermometer is still inside the water.

Student 3 follows all these precautions correctly. :contentReference[oaicite:4]{index=4}

Question 6. Colour the liquid column on the thermometer diagrams to show the following temperatures:

• (i) 14°C
• (ii) 17°C
• (iii) 7.5°C

Answer:

This is a practical activity. Draw the red liquid column up to the given temperature marks on each thermometer carefully using a ruler.

Explanation: Ensure that the top of the coloured column exactly matches the required temperature marking.

Question 7. Observe the thermometer shown in the figure 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: Read the temperature by observing the top of the liquid column in the given figure. (The exact value depends on the printed diagram in the textbook.)

(iii) What is the smallest value that this thermometer can measure?

Answer: 1°C

Explanation: The thermometer has ten equal divisions between two successive 10°C markings. Therefore, each small division represents 1°C. :contentReference[oaicite:5]{index=5}

Question 8. A laboratory thermometer is not used to measure our body temperature. Give a reason.

Answer:

A laboratory thermometer is designed for measuring the temperature of liquids and other substances over a wide range. It does not have the design features required to safely and accurately measure human body temperature. Unlike a clinical thermometer, its reading changes immediately when removed from the object being measured, making it unsuitable for measuring body temperature.

Explanation:

• Clinical thermometers are specially designed for the human body.
• Laboratory thermometers are meant for experiments.
• Using the correct thermometer ensures accurate and safe temperature measurement.

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