Question 1
The normal temperature of a healthy human is close to: (i) 98.6 °C (ii) 37.0 °C (iii) 32.0 °C (iv) 27.0 °C.
Steps only
(ii) 37.0 °C.
Answer
(ii) 37.0 °C.
CLASS 6 · SCIENCE · CHAPTER 7
Temperature and its Measurement
Simple, clear solutions to all 14 end questions, with practical thermometer guidance and answers to the main chapter prompts.
30 worked answersComplete chapter answers
30 worked answers · short steps first, explanations when you need them
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Textbook pages 137–140
Question 2
37 °C is equal to: (i) 97.4 °F (ii) 97.6 °F (iii) 98.4 °F (iv) 98.6 °F.
Steps only
(iv) 98.6 °F.
Answer
(iv) 98.6 °F.
Question 3
Fill in: (i) Hotness or coldness is determined by ___. (ii) Ice-cold water cannot be measured by a ___ thermometer. (iii) The unit is degree ___.
Steps only
(i) temperature (ii) clinical (iii) Celsius.
Answer
- (i) temperature
- (ii) clinical
- (iii) Celsius.
Question 4
The usual range of a laboratory thermometer is: (i) 10 °C to 100 °C (ii) –10 °C to 110 °C (iii) 32 °C to 45 °C (iv) 35 °C to 42 °C.
Steps only
(ii) –10 °C to 110 °C.
Answer
(ii) –10 °C to 110 °C.
Question 5
Four students use a laboratory thermometer as shown in Fig. 7.6. Who measures the temperature correctly?
Steps only
Student 2 (ii).
Answer
Student 2 (option ii). The bulb is immersed but does not touch the beaker, and the thermometer is held correctly.
Question 6
Colour the thermometer drawings to show 14 °C, 17 °C, and 7.5 °C.
Steps only
Mark the liquid at 14 °C, 17 °C, and halfway between 7 °C and 8 °C.
Answer
Show the columns at 14 °C, 17 °C, and halfway between 7 °C and 8 °C (7.5 °C), respectively.
Question 7
Observe Fig. 7.8. (i) What type is it? (ii) What is its reading? (iii) What is its smallest division?
Steps only
Clinical; 37.5 °C; smallest division 0.1 °C.
Answer
- (i) Clinical thermometer
- (ii) 37.5 °C
- (iii) 0.1 °C.
Question 8
Why is a laboratory thermometer not used to measure body temperature?
Steps only
It is not designed for body readings; use a clinical thermometer.
Answer
A laboratory thermometer is not designed specifically for body temperature and must be read while its bulb is still immersed. A clinical thermometer is designed for body readings.
Question 9
Vaishnavi’s recorded temperatures are shown in Table 7.4. (i) What was her highest? (ii) When was it recorded? (iii) On which day did it return to normal?
Steps only
(i) 40.0 °C (ii) Day One at 7 pm (iii) Day Three at 4 pm.
Answer
- (i) 40.0 °C
- (ii) Day One, 7 pm
- (iii) Day Three, at 4 pm it reached 37.0 °C.
Question 10
Which thermometer should measure 22.5 °C: a clinical one (35–42 °C, 0.1 °C divisions), a laboratory one (–10–110 °C, 1 °C divisions), or a laboratory one (–10–110 °C, 0.5 °C divisions)?
Steps only
Use thermometer 3 (–10 to 110 °C; 0.5 °C divisions).
Answer
Use the third thermometer: its range includes 22.5 °C and its smallest division is 0.5 °C.
Question 11
Choose the temperature shown in Fig. 7.10: (i) 28.0 °C (ii) 27.5 °C (iii) 26.5 °C (iv) 25.3 °C.
Steps only
(iii) 26.5 °C.
Answer
(iii) 26.5 °C.
Question 12
A laboratory thermometer has 50 equal divisions between 0 °C and 100 °C. What does one division measure?
Steps only
100 °C ÷ 50 = 2 °C per division.
Answer
Each division measures 2 °C.
Question 13
Draw the part of a thermometer scale from 10 °C to 20 °C when the smallest division is 0.5 °C.
Steps only
Mark every whole degree and add a half-degree mark between each.
Answer
Draw long marks for each whole degree from 10 °C to 20 °C. Add a short mark halfway between every pair of whole-degree marks to show each 0.5 °C step.
Question 14
Komal says she has a fever of 101 degrees. Does she mean Celsius or Fahrenheit?
Steps only
Fahrenheit (°F).
Answer
She means 101 °F (Fahrenheit).
Chapter Questions and Activities
Textbook pages 123–136, 140–141
Question Prompt 1
Can touch alone always tell us whether someone has a fever?
Steps only
No. Confirm with a clinical thermometer.
Answer
No. Touch is not reliable enough to confirm fever. Use a clinical thermometer according to its instructions.
Question Prompt 2
In the three-container activity, why might each hand feel the same tap water differently?
Steps only
The two hands adapt differently, so the same water feels different.
Answer
The hands adapt to different starting temperatures, so the same tap water can feel cool to one hand and warm to the other. Touch is not a reliable thermometer.
Question Prompt 3
What is temperature and what instrument measures it?
Steps only
Temperature measures hot/cold; thermometer measures temperature.
Answer
Temperature measures hotness or coldness; a thermometer measures temperature.
Question Prompt 4
What kind of thermometer can measure temperature without touching a person?
Steps only
A non-contact infrared thermometer.
Answer
A non-contact infrared thermometer can measure without touching the person.
Question Prompt 5
What precautions should be followed when measuring body temperature with a digital thermometer?
Steps only
Follow instructions; clean tip; keep display dry; wait for beep/signal.
Answer
Follow its instructions, clean the tip before and after, keep the display dry, and wait for the signal before reading.
Question Prompt 6
Will every healthy person always have exactly 37.0 °C?
Steps only
No; 37.0 °C is an average and normal readings vary slightly.
Answer
No. 37.0 °C is an average; a healthy person’s temperature may be slightly different.
Question Prompt 7
Why might one thermometer show 37 °C and another show 98.6 °F?
Steps only
Different scales, same temperature.
Answer
They use different scales: 37 °C is equal to 98.6 °F.
Question Prompt 8
Can a clinical thermometer measure ice-cold water or boiling water?
Steps only
No; use a suitable laboratory thermometer under supervision.
Answer
No. They are outside a clinical thermometer’s range. Use a suitable laboratory thermometer, with adult/teacher supervision for hot water.
Question Prompt 9
What is the range of the thermometer shown in Fig. 7.3a?
Steps only
–10 °C to 110 °C.
Answer
–10 °C to 110 °C.
Question Prompt 10
How do you find the smallest value a laboratory thermometer can read?
Steps only
Divide the gap between numbered marks by the number of small divisions.
Answer
Smallest division = difference between labelled marks ÷ number of small divisions. In the example, it is 1 °C.
Question Prompt 11
What is the correct way to use a laboratory thermometer in water?
Steps only
Vertical; bulb immersed, not touching; read in water at eye level.
Answer
Keep the thermometer vertical, bulb immersed without touching the beaker, and read at eye level while it is still in the water.
Question Prompt 12
Why can repeated readings of melting ice and boiling water stay nearly constant while they change state?
Steps only
During melting/boiling, temperature remains nearly constant until the change is complete.
Answer
While a substance changes state, its temperature remains nearly constant until the change is complete.
Question Prompt 13
Why might students record slightly different boiling-water temperatures?
Steps only
Reading/placement errors and local conditions can cause differences.
Answer
Differences can come from reading technique, thermometer placement, or local conditions such as air pressure.
Question Prompt 14
How can you analyse ten days of maximum and minimum air-temperature readings?
Steps only
Record the highs and lows, then compare patterns over the ten days.
Answer
Make a 10-day table, compare daily highs and lows, and describe any changes. They usually vary with weather and season.
Question Prompt 15
Can age affect body temperature?
Steps only
Age can have an effect, but people vary; measure rather than assume.
Answer
Age can affect temperature, but it is not safe to assume every child or older person has a certain temperature. Use an appropriate thermometer and seek adult or medical help when concerned.
Question Prompt 16
How can a class compare room temperature with water temperature during a day?
Steps only
Take paired readings at set times, record, and compare over days.
Answer
Record room and water temperatures at the same times each day for two weeks, then compare patterns. Follow the teacher’s setup and safety instructions.