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NCERT Class 6 Science Chapter 7 Temperature and its Measurement
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Temperature and its Measurement
Chapter: 7
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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.
Ans: (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.
Ans: (iv) 98.6 °F.
3. Fill in the blanks:
(i) The hotness or coldness of a system is determined by its _____________.
Ans: Temperature.
(ii) The temperature of ice-cold water cannot be measured by a ______________ thermometer.
Ans: Clinical.
(iii) The unit of temperature is degree _____________.
Ans: 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.
Ans: (ii) –10 °C to 110 °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.
Ans: (iii) Student 2.
Student 2 has the thermometer vertically immersed in the water without touching the sides or bottom of the beaker, which is the correct method for measuring temperature with a laboratory thermometer.
6. Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below:
Ans:
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 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?
Ans: The lowest mark on the thermometer is -10’ so this is a laboratory thermometer that has a measuring range of -10 °C to 110 °C.
(ii) What is the reading of the thermometer?
Ans: The reading of the thermometer is 26 °C.
(iii) What is the smallest value that this thermometer can measure?
Ans: There are 10 small line marks between any 10 degrees (0-10, 10-20 and so on) on the thermometer. So the thermometer can measure the smallest value of – 10°C.
8. A laboratory thermometer is not used to measure our body temperature. Give a reason.
Ans: There are 10 small line marks between any 10 degrees (0-10, 10-20 and so on) on the thermometer. So the thermometer can measure the smallest value of – 10°C.
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.
Table 7.4: Body temperature record of Vaishnavi
| Temperature at | ||||||
| DAY | 7am | 10am | 1pm | 4pm | 7pm | 10pm |
| One | 38.0 °C | 37.8 °C | 38.0 °C | 38.0 °C | 40.0 °C | 39.0 °C |
| Two | 38.6 ° C | 38.8 °C | 39.0 °C | 39.0 °C | 39.0 °C | 38.0 °C |
| Three | 37.6 °C | 37.4 °C | 37.2 °C | 37.0 °C | 36.8 °C | 36.6 °C |
(i) What was Vaishnavi’s highest recorded temperature?
Ans: Vaishnavi’s highest recorded temperature is 40.0 °C.
(ii) On which day and at what time was Vaishnavi’s highest temperature recorded?
Ans: Day one at 7 pm.
(iii) On which day did Vaishnavi’s temperature return to normal?
Ans: 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.
Ans: We will use thermometer (b) Thermometer (a) can measure the smallest value of 1°C and thermometer (c) can measure the smallest value of 2°C as per the small line markings on these. Only thermometer (b) has the markings on it to measure the smallest value of 0.5°C which is necessary for measuring 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.
Ans: (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?
Ans: A laboratory thermometer with 50 divisions between 0°OC and 100°C means each division represents a specific temperature increment. To determine the value of each division, divide the total temperature range by the number of divisions. Here, the range is 100°C (from 0°C to 100°C) and there are 50 divisions. Therefore, each division measures Value of each division = 100°C/50 = 2°C.
Thus, each division on this laboratory thermometer represents 2°C. This allows for measurements to be read with an accuracy of 2°C increments.
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.
Ans:
The scale will have 20 divisions between 10°C and 20°C, with each division representing 0.5°C.
14. Someone tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?
Ans: If someone tells me that she has a fever of 101 degrees, she means it on the Fahrenheit scale. A body temperature of 101 degrees Fahrenheit indicates a fever, as the normal human body temperature is approximately 98.6°F. In Celsius, 101 degrees would be extremely high and life-threatening, since normal body temperature is around 37°C and 101°C is far beyond human tolerance. Therefore, it is clear that the fever is being referred to in Fahrenheit.
