Temperature and its Measurement Class 6 Question Answer Science Chapter 7

Temperature and its Measurement Class 6 Questions and Answers NCERT Solutions

Class 6 Science Chapter 7 Temperature and its Measurement Question Answer

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Question 1.
The normal temperature of a healthy human being is close to (page 137)
(i) 98.6° C
(ii) 37.0° C
(iii) 32.0° C
(iv) 27.0° C
Answer:
(ii) 37.0° C

Question 2.
237° 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

Question 3.
Fill 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 _______.
Answer:
(i) temperature
(ii) clinical
(iii) Celsius

Question 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

Question 5.
Four students used a laboratory thermometer to measure the temperature of water as shown in the figure (Page 137)

Who do you think followed the correct way for measuring temperature?
(i) Student 1
(ii) Student 2
(iii) Student 3
(iv) Student 4
Answer:
(ii) Student 2

Question 6.
Colour to show the red column on the drawings of thermometers as per the temperatures written below (Page 138)

Answer:

Question 7.
Observe the part of thermometer shown in the given figure 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?
Answer:
(i) It is a laboratory thermometer.
(ii) 26° C
(iii) There are 10 divisions between 10° C and 20° C. So, on dividing the value by the no. of divisions, the smallest value that this thermometer can measure will be, 10 / 10 = 1° C.

Question 8.
A laboratory thermometer is not used to measure our body temperature. Give a reason.
Answer:
A laboratory thermometer is not used to measure our body temperature as it doesn’t have a kink. The kink, in a clinical thermometer, prevents mercury level from falling on its own so that temperature can be read even when the thermometer is no longer in contact with our body.

Question 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 the table given.

(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?
Answer:
(i) Vaishnavi’s highest recorded temperature was 40.0° C.
(ii) Vaishnavi’s highest temperature was recorded on day One at 7 pm .
(iii) Vaishnavi’s temperature returned to normal orn day Three.

Question 10.
If you have to measure the temperature 22.5° C, which of the following three thermometers will you use (see the figure)? Explain.

Answer:
Thermometer (b) can be used to measure the temperature 22.5° C appropriately. The least temperature that can be measured by using thermometer (b) is 0.5° C. While for (a) and (c), it is 1° C and 2° C respectively. Therefore, to measure a temperature having 0.5° C of preciseness, thermometer (b) is appropriate.

Question 11.
The temperature shown by the thermometer in the given figure is (Page 141)

(i) 28.0° C
(ii) 27.5° C
(iii) 26.5° C
(iv) 25.3° C
Answer:
(ii) 27.5° C

Question 12.
A laboratory thermometer has 50 divisions between 0° C and 100° C. What does each division of this thermometer measure?
Answer:
Each division of thermometer = Value/No. of divisions
= 100 / 50  = 2° C

Question 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.
Answer:

Question 14.
Someone tells you that she has a fever of 101 degrees. Does she mean it on the Celsius scale or Fahrenheit scale?
Answer:
She is mentioning about the Fahrenheit scale. Because in Fahrenheit scale, the normal human body temperature is measured to be 98.6° F and if the body temperature increases by 2-3 degrees from this value, then the person is said to be suffering from fever.

NCERT Solutions for Class 6 Science Chapter 7 Temperature and its Measurement

Intext Questions

Question 1.
Can it always be correctly judged that a person has fever, only by touching the person? (Page 123)
Answer:
No, sense of touch is not always reliable to judge whether a person is suffering from fever or not. Measuring body temperature is advised to check if a person is suffering from fever.

Question 2.
Do small children generally have slightly higher body temperatures as compared to adults? (Page 128)
Answer:
A child’s normal body temperature can range from 36.1° C to 37.9° C, whereas the average adult body temperature is around 37° C. So, we can say that small children have slightly higher body temperature as compared to adults.

Question 3.
Do old people, even when healthy, generally have lower body temperatures than young adults? (Page 128)
Answer:
Yes, the given statement is true. As a person ages, he loses fat and the skin becomes drier, both of these changes cause loss of body heat. Metabolism, which also generates heat, tends to slow down.

Question 4.
I have seen a friend of mine using a digital thermometer that reads temperature on a different scale. It shows the normal temperature of a healthy human body as 98.6° F.
What is the reason for this difference? (Page 128)
Answer:
There is another scale of temperature known as Fahrenheit scale. On this scale, the unit of temperature is degree Fahrenheit and is denoted by ° F. A temperature measured as 37.0° C on Celsius scale is equivalent to 98.6° F on Fahrenheit scale.

Question 5.
Can a clinical thermometer be used for measuring the temperature of boiling water or for measuring the temperature of ice? (Page 129)
Answer:
No, the range of clinical thermometer is from 35° C to 42° C and the temperatures of boiling water and ice are outside the range of a clinical thermometer.

Question 6.
How can we measure temperatures beyond the range of a clinical thermometer? (Page 129)
Answer:
We can use a laboratory thermometer to measure the temperatures beyond the range of a clinical thermometer. The range of a laboratory thermometer is from -10° C to 110° C.

Question 7.
Can we use a laboratory thermometer for measuring body temperature of a person? (Page 132)
Answer:
A laboratory thermometer can’t be used to measure body temperature as it doesn’t have a kink. The kink, in a clinical thermometer, prevents mercury level from falling on its own, so that temperature can be read even when the thermometer is no longer in contact with our body.

Let’s Investigate

Activity 1 (Page 124)

Aim : To understand whether we can rely upon our sense of touch to decide correctly whether a body is hot or cold.
Materials required Three large beakers or containers, ice cold water, hot water and tap water.

Procedure and Observations :

1. Take three large containers and label them as A, B and C.
2. Pour warm water in container A, tap water in B and ice cold water in C.
3. Dip your right hand in A and left hand in C and keep them there for 1-2 minutes.
4. Now, take out your hands from containers A and C and place both hands simultaneously in B.

5. Write down your predictions and observations in the table.

Prediction	Observation
Both the hands will feel the same on dipping them in container B.	Right hand felt the tap water to be cold while the left hand felt the same water to be warm.

6. Compare whether your observations match with your predictions.

7. You must have observed that your right hand felt that the water in container B is cool, while your left hand felt that the same water is warm.

Conclusion : We can conclude that we cannot always rely upon our sense of touch to decide correctly whether a body is hot or cold.

Viva Questions :

1. How does the heat flow?
2. What did you observe when you placed both hands in container B after keeping them in different temperatures?

Activity 2 (Page 127)

Aim : To use a digital clinical thermometer to measure body temperature.
Materials required A digital clinical thermometer.

Procedure and Observations :

1. Wash your hands and the tip of the digital thermometer with soap and water.
2. Reset the thermometer by pressing the reset button.
3. Place the thermometer under the tongue and close your mouth.
4. Wait till the thermometer makes a beeping sound or flashes a light.
5. Take it out from the mouth and read the temperature on the digital display.
6. Record the temperature in a table. (Temperatures may vary)
7. Clean the tip of the thermometer with soap and water, and dry it.
8. Repeat the above steps for measuring the temperatures of your friends and record them in the table. (Temperatures may vary)

S. No.	Name	Temperature °C
1.	Your name	37.2
2.	Nikhil	35.5
3.	Priya	36.0
4.	Seema	37
5.	Raju	36.8

9. You will observe that the temperature of healthy human body lies between 35° C to 37.2° C.

Conclusion : The normal temperature of a healthy human body is taken to be 37.0° C but we can conclude that the temperature can slightly vary from this value based on several factors, such as age, time of the day and activity level.

Viva Questions :

1. What happens when the human body temperature goes beyond 37.2° C ?
2. What is one advantage of digital thermometer above mercury thermometer?

Activity 3 (Page 130)

Aim : To find the temperature range of a given laboratory thermometer.
Materials required A laboratory thermometer.

Procedure and Observations :

1. Take a laboratory thermometer and observe it carefully.
2. Note down the lowest temperature that it can measure.
3. You will observe that it is -10° C.
4. Note down the highest temperature that it can measure.
5. You will observe that it is 110° C.
6. This gives you the range of a laboratory thermometer.

Conclusion : We can conclude that the range of a laboratory thermometer is from -10° C to 110° C.

Viva Questions :

1. Can we hold a laboratory thermometer by its bulb?
2. How can you tell if a thermometer is working properly?
3. Which liquid is used in laboratory thermometer?

Activity 4 (Page 131)

Aim To find the smallest value that a given laboratory thermometer can read.

Materials required A laboratory thermometer.

Procedure and Observations :

1. Again, take the same laboratory thermometer which you used in Activity 3 and observe it carefully. Its close up part is shown in the figure.

1. Note that the temperature difference indicated between 0 { ° C and 10° C or between 10° C and 20° C is 10° C.
2. Also, note that the number of divisions between these marks are 10 divisions.
3. So, one small division can read 10 / 10 = 1° C.
4. Therefore, the smallest value that this thermometer can read is 1° C.

Conclusion : We can conclude that the smallest value that this thermometer can read is 1° C.
Note The range and the value of the smallest division may be different. It is, therefore, always necessary to look carefully at the thermometer you are about to use.

Viva Questions :

1. Is the smallest value that a laboratory thermometer can read always same for all types of laboratory thermometers?
2. Write one use of laboratory thermometer.

Activity 5 (Page 132)

Aim : To understand the correct way of measuring temperature using a laboratory thermometer.
Materials required A laboratory thermometer and a beaker filled with water.

Procedure and Observations :

1. Take some warm water in a beaker.
2. Dip the thermometer in water, so that the bulb is immersed in water as shown in figure.
3. Observe the rise of liquid column in the thermometer.
4. Wait till the column stops rising and note the temperature.
5. Note down the temperature reading.
6. You will observe that as soon as you take the thermometer out of the water, the level of liquid column begins to fall.

Conclusion : We can conclude that while measuring temperature through laboratory thermometer, its bulb should not touch the bottom or the sides of the beaker. Also, the temperature must be read while the thermometer is immersed in water.

Activity 6 (Page 133)

Aim : To compare the temperature readings of boiling water measured by different students.
Materials required Temperature readings of the boiling water taken by different students.

Procedure and Observations :

1. Observe the temperature readings of the boiling water taken by Phiban and her classmates in Shillong. (Given in the table below)
2. Compare the temperatures of boiling water recorded by different students.
3. You will observe a difference in the readings taken by different students.

Conclusion : We can conclude that the correct way of reading temperature was not followed by all the students, and hence, there are differences in their readings. The possible reasons for not getting the correct readings are given as follows
– The mercury bulb was touching the surface of the container.
– The thermometer was tilted.

Viva Questions (Activity 5-6 combined)

1. What is the boiling point of water?
2. What are the correct ways of measuring temperature by laboratory thermometer?
3. Can we use a laboratory thermometer to measure human body temperature?

Activity 7 (Page 134)

Aim : To analyse the data of maximum and minimum air temperature of successive 10 days.
Materials required Weather reports of a place for 10 successive days.

Procedure and Observations :

1. Read or listen to the weather reports of a place for 10 successive days.
2. Record the maximum and minimum air temperature for each day in a table. (Data may vary)
3. Analyse the data in the table.

4. You will observe that the maximum and minimum temperature do not stay the same during these days.

Conclusion : We can conclude that these temperatures usually vary every day because weather depends on several factors.

Viva Questions :

1. What do you understand by air temperature?
2. Why do the maximum and minimum temperature of a place not stay the same during successive days?

Do it yourself (DIY)

To explore more about the boiling and melting point of water.

Curiosity Class 6 Science Book Solutions