Chapter 7 of Class 6 Science, Temperature and its Measurement, explains the basic features that make an organism live. Through simple questions and answers, students can easily understand this chapter.

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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

Answer: (ii) 37.0 °C

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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: (iv) 98.6 °F

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3. Fill in the blanks:

(i) The hotness or coldness of a system is determined by its ______.
Answer: temperature

(ii) The temperature of ice-cold water cannot be measured by a ______ thermometer.
Answer: clinical

(iii) The unit of temperature is degree ______.
Answer: Celsius

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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: (ii) –10 °C to 110 °C

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5. Four students used a laboratory thermometer to measure the temperature of water (Fig. 7.6). Who followed the correct way?

(i) Student 1
(ii) Student 2
(iii) Student 3
(iv) Student 4

Answer: (iii) Student 3

Reason:

The reading should be taken while the thermometer is still inside the water.

The thermometer should be held vertically.

The bulb should not touch the sides or bottom of the beaker.

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6. Colour to show the red column on the drawings of thermometers as per the temperatures written below:

14 °C
17 °C
7.5 °C

Answer:

• For 14 °C → Colour up to 14 mark.
• For 17 °C → Colour up to 17 mark.
• For 7.5 °C → Colour halfway between 7 °C and 8 °C.

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7. Observe the thermometer shown in Fig. 7.8 and answer:

(i) What type of thermometer is it?
Answer: Laboratory thermometer

(ii) What is the reading of the thermometer?
Answer: The reading is approximately 30 °C (as shown in the figure).

(iii) What is the smallest value that this thermometer can measure?
Answer: 1 °C

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

Answer:
A laboratory thermometer does not have a kink to hold the mercury level.
The mercury falls immediately when removed from the body.
Also, its range is wider and not suitable for measuring body temperature accurately.

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9. Vaishnavi’s temperature record (Table 7.4)

(i) What was Vaishnavi’s highest recorded temperature?
Answer: 40.0 °C

(ii) On which day and at what time was it recorded?
Answer: On Day One at 7 pm

(iii) On which day did her temperature return to normal?
Answer: On Day Three

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10. If you have to measure 22.5 °C, which thermometer will you use? Explain.

Answer:
Use the thermometer that can measure decimal values (0.5 °C divisions).
Because 22.5 °C requires a half-degree measurement.

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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

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

100 ÷ 50 = 2

Answer:
Total temperature difference = 100 °C
Number of divisions = 50

Each division = 100 ÷ 50 = 2 °C

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13. Draw the scale of a thermometer in which the smallest division reads 0.5 °C (between 10 °C and 20 °C).

Between every 1 °C mark, draw one small line in between.
Each small line will represent 0.5 °C.

14. Komal tells you that she has a fever of 101 degrees. Does she mean Celsius or Fahrenheit?

Answer:
She means 101 °F (Fahrenheit scale).

Because 101 °C would be extremely high and impossible for the human body.

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📌 Important Points (Exam Revision)

✔ Normal body temperature = 37 °C
✔ SI unit of temperature = Kelvin (K)
✔ Laboratory thermometer range = –10 °C to 110 °C
✔ Boiling water temperature ≈ 100 °C
✔ Ice melting temperature = 0 °C