Temperature and Its Measurement
Temperature and its Measurements
1. The normal temperature of a healthy human being is close to:
Answer: (ii) 37.0 °C
2. 37 °C is the same temperature as:
Answer: (iv) 98.6 °F
3. Fill in the blanks:
- (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:
Answer: (ii) –10 °C to 110 °C
5. Four students used a laboratory thermometer to measure the temperature of water (refer to Fig. 7.6). Who did it correctly?
Answer: Student 2, as the thermometer should be held vertically without touching the sides or bottom of the container.
6. Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written: 14 °C, 17 °C, 7.5 °C.
Answer: The answer will be uploaded soon.
7. Observe the part of the thermometer shown in Fig. 7.8 and answer the following:
- (i) What type of thermometer is it?
Answer: Clinical thermometer. - (ii) What is the reading of the thermometer?
Answer: 26 °C. - (iii) What is the smallest value that this thermometer can measure?
Answer: 10 °C.
8. Why is a laboratory thermometer not used to measure our body temperature?
Answer: It must be read while immersed in the substance. Measuring body temperature requires the thermometer to be removed for reading.
9. Vaishnavi has not gone to school as she is ill. Her mother has kept a record of her body temperature for three days (refer to Table 7.4). Answer the following:
- (i) What was Vaishnavi’s highest recorded temperature?
Answer: 40.0 °C. - (ii) On which day and at what time was this highest temperature recorded?
Answer: Day One, 7 pm. - (iii) On which day did her temperature return to normal?
Answer: On Day Three.
10. If you have to measure the temperature of 22.5 °C, which of the following three thermometers (refer to Fig. 7.9) will you use? Explain your choice.
| Thermometer | Scale Range Description |
|---|---|
| (a) | Includes 22.5 °C |
| (b) | Includes 22.5 °C |
| (c) | Starts from 30 °C (too high) |
Answer: Thermometer (a) or (b) should be used because their scales include 22.5 °C; Thermometer (c) is unsuitable due to its starting value.
11. The temperature shown by the thermometer in Fig. 7.10 is:
| Option | Temperature |
|---|---|
| (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 measure?
Answer: Each division measures 2 °C (100 °C / 50 = 2 °C per division).
13. Draw the scale of a thermometer in which the smallest division reads 0.5 °C. (Only the portion between 10 °C and 20 °C is needed.)
Answer: This question requires a drawing, which cannot be provided in this text format.
14. Komal tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?
Answer: She means it on the Fahrenheit scale, as 101 °C would be unrealistically high for a human body temperature.
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