Chapter 7 Temperature and its Measurement Class 6 Science Curiosity NCERT Solutions
Chapter 7 Temperature and its Measurement NCERT Solutions Class 6 Science
Question 1. Can it always be correctly judged, that a person has fever, only by touching the person?
Answer
It cannot always be correctly judged that a person has fever, only by touching the person as we are not able to calculate accurate temperature of the body.
If the palm of the hand is cold, the person with normal temperature may be judged with fever.
Also, if the palm of the hand is already warm, the person with fever may be felt at normal temperature.
For correct judgement that a person has fever or not, we must use clinical thermometer correctly.
Question 2. Do small children generally have slightly higher body temperatures as compared to adults?
Answer
Yes, small children usually have slightly higher body temperatures compared to adults because their bodies are working hard to grow quickly, which makes more heat.
For kids, a normal body temperature is usually between 37.0°C and 37.5°C . For adults, it’s a bit lower, usually between 36.1°C and 37.2°C.
Question 3. Do old people, even when healthy, generally have lower body temperatures than young adults?
Answer
Yes, even healthy older people generally have lower body temperatures than young adults. As people age, their bodies slow down and don’t produce as much heat. For older adults, normal body temperature is often around 36.2°C to 36.8°C, which is slightly lower than the typical range for younger adults.
Question 4. Can a clinical thermometer be used for measuring the temperature of boiling water? Or for measuring the temperature of ice?
Answer
A clinical thermometer has a range of 35 °C to 42 °C. The temperature of boiling water is 100 °C and is beyond the range of a clinical thermometer. Also the temperature of ice is 0 °C or below, and is beyond the range of clinical thermometer.
Therefore a clinical thermometer cannot used for measuring the temperatures of boiling water or of ice.
Let us enhance our learning
1. 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
2. 37 °C is the same temperature as _____.
(i) 97.4 °F
(ii) 97.6 °F
(iii) 98.4 °F
(iv) 98.6 °F
Answer
(iii) 98.4 °F
3. Fill in the blanks:
(i) The hotness or coldness of a system is determined by its _____.
(ii) The temperature of ice-cold water cannot be measured by a _____ thermometer.
(iii) The unit of temperature is degree _____.
Answer
(i) The hotness or coldness of a system is determined by its temperature.
(ii) The temperature of ice-cold water cannot be measured by a clinical thermometer.
(iii) The unit of temperature is degree celsius.
4. 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
(i) 10 °C to 100 °C
5. 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
Student 2 measured the temperature of the water by following the correct way, as the thermometer was placed in an upright position without touching the sides or the bottom of the beaker.
6. Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below:
- In the first thermometer for 14°C, colour up to two small lines above mark 10 (each small line indicates 2 degrees Celsius).
- In the second thermometer for 17°C, colour up to seven small lines above mark 10 (each small line indicates 1 degree Celsius).
- In the third thermometer for 7.5°C, colour up to fifteen small lines above mark 0 (each small line indicates 0.5 degree Celsius).
Red lines are marked alongside the respective thermometers for information.
7. Observe the part of thermometer shown in Fig. 7.8 and answer the following questions:
(i) What type of thermometer is it?
(ii) What is the reading of the thermometer?
(iii) What is the smallest value that this thermometer can measure?
Answer
(i) The given thermometer has a minimum temperature marking of -10 degrees. Since laboratory thermometers typically have a temperature range from -10°C to 110°C, this indicates that it is a laboratory thermometer.
(ii) The reading of the thermometer is 26°C.
(iii) Since the minimum temperature marking on the thermometer is -10°C, this is the lowest temperature it can measure.
8. A laboratory thermometer is not used to measure our body temperature. Give a reason.
Answer
(i) It has a wide temperature range, from -10°C to 110°C, and the lowest temperature it can measure is 1°C, which makes it unsuitable for detecting small temperature changes in the human body.
(ii) The temperature on a laboratory thermometer must be read while it is in contact with the heat source because, as soon as you remove it, the temperature will begin to decrease rapidly, making it unsuitable for measuring body temperature.
9. 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?
(ii) On which day and at what time was Vaishnavi’s highest temperature recorded?
(iii) On which day did Vaishnavi’s temperature return to normal?
Answer
(i) 40°C.
(ii) Vaishnavi's highest temperature was recorded at 7 p.m. on the Day one. (iii) Day three.
10. If you have to measure the temperature 22.5 °C, which of the following three thermometers will you use (Fig. 7.9)? Explain.
Answer
Thermometer (b) would be the best choice, as it has markings that allow for reading half- degree increments, making it possible to accurately measure a temperature of 22.5°C.
11. 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
12. A laboratory thermometer has 50 divisions between 0 °C and 100 °C. What does each division of this thermometer measure?
Answer
50 divisions of the thermometer = 100°C
1 division of the thermometer = 100°C/50 = 2°C
13. 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
14. Someone tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?
Answer
If someone says they have a fever of 101 degrees, they are referring to the Fahrenheit scale Since normal human body temperature is around 37°C, 101°C would be an intolerable temperature for the body to bear.