CBSE · NCERT · Class 6 Science · Chapter 7

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

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Chapter-wise NCERT intext questions and exercise answers for Temperature and its Measurement, grounded in the official textbook.

Questions are taken verbatim from the NCERT textbook; answers were grounded against the chapter's content during generation. Items needing review are marked.
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Q.1The 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 °Cv
  1. i. 98.6 °C
  2. ii. 37.0 °C
  3. iii. 32.0 °C
  4. iv. 27.0 °C
Solution

The chapter states that the normal body temperature of a healthy human being is about 37.0 °C.

Answer:

(ii) 37.0 °C

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Q.237 °C is the same temperature as ----------------. (i) 97.4 °F (ii) 97.6 °F (iii) 98.4 °F (iv) 98.6 °Fv
  1. i. 97.4 °F
  2. ii. 97.6 °F
  3. iii. 98.4 °F
  4. iv. 98.6 °F
Solution

Normal human body temperature is commonly written as 37 °C or 98.6 °F.

Answer:

(iv) 98.6 °F

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Q.3Fill 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 ----------------.v
Solution

Temperature tells how hot or cold something is. A clinical thermometer has a limited range for body temperature and is not suitable for ice-cold water. In this chapter, temperature is measured in degree Celsius.

Answer:

(i) temperature (ii) clinical (iii) Celsius

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Q.4The 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 °Cv
  1. i. 10 °C to 100 °C
  2. ii. -10 °C to 110 °C
  3. iii. 32 °C to 45 °C
  4. iv. 35 °C to 42 °C
Solution

A laboratory thermometer usually measures temperatures from -10 °C to 110 °C, which is wider than the clinical thermometer range.

Answer:

(ii) -10 °C to 110 °C

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Q.5Four 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 4v
  1. i. Student 1
  2. ii. Student 2
  3. iii. Student 3
  4. iv. Student 4
Solution

The thermometer should be held upright with its bulb dipped in water, without touching the bottom or sides of the container. In the figure, Student 3 follows this method.

Answer:

(iii) Student 3

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Q.6Colour to show the red column on the drawings of thermometers (Fig. 7.7) as per the temperatures written below: 14 °C, 17 °C, 7.5 °C.v
Solution

Read the Celsius scale and stop the coloured column exactly at the mark for each given temperature. For 7.5 °C, stop halfway between 7 °C and 8 °C if each small division is 1 °C, or at the marked half-degree if the scale shows it.

Answer:

The red column should be drawn up to 14 °C on the first thermometer, 17 °C on the second thermometer and 7.5 °C on the third thermometer.

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Q.7Observe 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?v
Solution

The scale shown is the wide laboratory thermometer scale. The red column ends at the middle mark between 20 °C and 30 °C, which is 25 °C. The smallest marked division on the scale is 1 °C.

Answer:

(i) It is a laboratory thermometer. (ii) The reading is 25 °C. (iii) The smallest value it can measure is 1 °C.

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

Clinical thermometers are designed specifically for the human body temperature range and for safe, convenient body-temperature readings.

Answer:

A laboratory thermometer is not suitable for body temperature because it does not have the special design of a clinical thermometer that holds the reading after removal from the body. It also has a wider range and is less convenient for body-temperature measurement.

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Q.9Vaishnavi 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?v
Solution

Comparing all entries in Table 7.4, the largest value is 40.0 °C at 7 pm on Day One. The Day Three readings are around the normal body temperature range and decrease from 37.6 °C to 36.6 °C.

Answer:

(i) Vaishnavi's highest recorded temperature was 40.0 °C. (ii) It was recorded on Day One at 7 pm. (iii) Her temperature returned to normal on Day Three.

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Q.10If you have to measure the temperature 22.5 °C, which of the following three thermometers will you use (Fig. 7.9)? Explain.v
Solution

To measure 22.5 °C accurately, the thermometer must have a least count of 0.5 °C or smaller. In Fig. 7.9, thermometer (b) has sufficiently fine divisions to read 22.5 °C.

Answer:

Thermometer (b) should be used.

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Q.11The 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 °Cv
  1. i. 28.0 °C
  2. ii. 27.5 °C
  3. iii. 26.5 °C
  4. iv. 25.3 °C
Solution

The red column ends halfway between 27 °C and 28 °C, so the reading is 27.5 °C.

Answer:

(ii) 27.5 °C

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Q.12A laboratory thermometer has 50 divisions between 0 °C and 100 °C. What does each division of this thermometer measure?v
Solution

Temperature interval = 100 °C - 0 °C = 100 °C. Number of divisions = 50. Value of one division = 100 °C ÷ 50 = 2 °C.

Answer:

Each division measures 2 °C.

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Q.13Draw 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.v
Solution

Since the least count is 0.5 °C, each 1 °C interval must be divided into two equal parts.

Answer:

Between 10 °C and 20 °C, mark every 1 °C clearly and add one smaller division halfway between each pair of consecutive degree marks. Each small division will then represent 0.5 °C.

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Q.14Komal tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?v
Solution

A body temperature of 101 °C is impossible for a living human body and is far above the boiling point of water. Fever readings such as 101 degrees are commonly on the Fahrenheit scale.

Answer:

She means 101 °F, on the Fahrenheit scale.

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