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

Intext Questions

(Page no. 123)

Question 1.
Can it always be corretly judged, that a person has fevet, only by touching the person?
Answer:
It cannot always be correctly judged that a person has fever, only by touching the person. If a person has a normal body temperature and the hand touching that person is cold, the person will feel to be warm to the hand.

If the hand touching a person is warm, the person with fever may be felt as at normal temperature. For correct judgement that a person has fever or not, we must use clinical thermometer correctly.

(Page no. 128)

Question 1.
Do small children generally have slightly higher body temperatures as compared to adults?
Answer:
Yes, small children usually have slightly higher body temperatures compared to adults. This is because their bodies are working hard to grow quickly, which makes more heat. For kids, a normal body temperature is usually between 37°C and 37.5°C For adults, it’s a bit lower, usually between 36.1°C and 37.2°C.

Question 2.
Do old people, even when healthy, generally have lower body temperatures than young adults?
Answer:
Yes, even healthy older people generally have lower body temperatures than young adults. As people age, their bodies slow down and don’t produce as much heat, For older adults, normal body temperature is often around 36.2°C to 36.8°C, which is slightly lower than the typical range for younger adults.

(Page no. 129)

Question 1.
Can a clinical thermometer be used for measuring the temperature of boiling water? or for measuring the temperature of ice?
Answer:
A clinical thermometer has a range of 35°C to 42°C. The temperature of boiling water is 100 °C and is beyond the range of a clinical thermometer. Also the temperature of ice is 0°C or below, and is beyond the range of clinical thermometer. Therefore a clinical thermometer cannot used for measuring the temperatures of boiling water or of ice.

Let Us Enhance Our Learning

Question 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

Question 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

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 can not be measured by a …………….. thermometer.
(iii) The unit of temperature is degree …………….
Answer:
(i) temperature,
(ii) elinical thermo-meter,
(iii) Celcius

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 Fig. 7 :

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 (Fig. 8) as per the temperatures written below :

Answer:
Hint : 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.

Question 7.
Observe the part of thermometer shown, in Fig. 9. 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) 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) The reading of the thermometer is 26°C.
(iii) 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

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 because as soon as we take out the bulb of the laboratory thermometer from our mouth, the level of mercury in the tube will start falling quickly. This will give a wrong value of the body temperature.

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 table.

(i) What was Vaishnavi’s highest recorded temperature?
(ii) On which day and what time was. Vaishnavi’s highest temperature recorded?
(iii) On which day did Vaishnavi’s temperature return to normal?
Answer:
(i) 40.0°C
(ii) Day one. Time : 7 p.m.
(iii) Three day.

Question 10.
If you have to measure the temperature 22.5°C, which of the following three thermometers will you use (Fig. 10) ? Explain.
Answer:
We will use thermometer (c) because the smallest value that this thermometer can read is 0.5°C

Question 11.
The temperature shown by the thermometer in Fig. 11. is:

(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:
\(\frac{100}{50}=2^{\circ}\)
Each division of this thermometer measure =2°

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:
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.

Activities

Activity 1.

Aim: To find out if our sense of touch can give us a reliable judgement about the hotness or coldness.
Materials Required : A large containers (3), bearable hot water, lukewarm water and ice cold water.

Procedure:

• Take three large containers and label them A, B and C.
• Pour warm (hot) water in Container A, tap water in B and ice cold water in C.
• Dip your right hand in A and left hand in C and keep them there for 1-2 minutes.
• Take out your hands from containers A and C, and place both hands simultaneously in B.

Observations:

Fingers of		Fingers of
Right hand	Left hand	Right hand	Left hand
Container A : Hot	Container B : Cold	Container C : Cold	Container B : Hot

The right hand fingers feel water in container B to be cold.
The right hand fingers feel water in container B to be hot.

Conclusion : Our sense of touch is not reliable in finding out the degree of hotness or coldness.

Activity 2.

Aim : To measure body temperature using digital clinical thermometer.
Observations: Digital clinical thermometer, soap, water.

Procedure:

• Wash your hands and the tip of the digital thermometer with soap and water.
• Reset the thermometer by pressing the reset button.
• Place the thermometer under the tongue and close your mouth.
• Wait till the thermometer makes a beeping sound or flashes a light.
• Take it out from the mouth and read the temperature on the digital display.
• Record the temperature in a table.
• Clean the tip of the thermometer with soap and water and dry it.
• Repeat the above steps for measuring the temperature of your friends.

Observations:

S.No.	Name	Temperature (°C)
1.	Ramesh	37.1 °C
2.	Suresh	37.2 °C
3.	Mohan	37 °C
4.	Madhav	36.9 °C
5.	Prem	37.1 °C
6.	Ashok	37 °C
7.	Nirmal	37.2 °C
8.	Rana	37 °C
9.	Amar	37.1 °C
10.	Munna	37 °C

Calculation:
Average temperature

Result: Number of friends having normal body temperature =3
Number of friends having body temperature above normal =6
Number of friends having body temperature below normal =1
Average temperature =37.06

Precautions:

• Thermometer should be used after reading the instruction manual of the thermometer.
• Tip of the thermometer should be washed with soap and water before and after use.
• While washing, care should be taken to keep the digital portion such as the display out of water.
• Do not hold the thermometer by the tip.

Activity 5.

Aim: To find the temperature of warm water.
Materials Required: Beaker, warm water, laboratory thermometer.

Procedure :

• Take some warm water in a beaker.
• Dip the thermometer in water so that the bulb is immersed in water.
• Observe the rise of liquid column in the thermometer.
• Wait till the column stops rising and note the temperature.

Result: Temperature of water = ……°C.

Precautions:

• The thermometer should be held vertically.
• The bulb of the thermometer should be well surrounded by water whose temperature is to be measured.
• The bulb should not touch the bottom or sides of the beaker
• The eye should be kept at the level of mercury.

Activity 6.

Aim : To compare the temperatures of boiling water recorded by different students.

Material Required: Experimental set-up for measuring temperature of boiling water.

Procedure:

• The teacher will arrange the experimental set for measuring temperature of boiling water.
• In a beaker, take some water and insert a thermometer in it with the help of a clamp.
• Put the beaker on a tripod stand and heat the beaker.
• We see a steady steam of bubbles. This temperature is the boiling point of water.
• Note this or temperature.

Observation: The temperature readings of the boiling water taken by Phiban and her classmates are given follow :

Name	Temperature of boiling water (in °C)
Phiban	97.8
Shemphang	98.0
Onestar	97.9
Kloi	98.0
Bandarisha	98.1

Result: The average boiling point of water
\(=\frac{97.8+98.0+97.9+98.0+98.1}{5}=\frac{489.8}{5}=97.9^{\circ} \mathrm{C} \)
The main reason of differences in their readings is that the correct way of reading temperature was not followed by all the students.

Activity 7.

Aim: To collect the weather reports of a room for last 10 successive days.
Material Required: Room thermometer.

Procedure:

• Read or listen to the weather reports for a place for to successive days.
• Record the maximum and minimum air temperature for each day.
• Analyse the data

Observations:

S.No.	Date	Maximum air temperature	Minimum air temperature
1.	1-8-2024	36 °C	26 °C
2.	2-8-2024	35 °C	26 °C
3.	3-8-2024	35 °C	25 °C
4.	4-8-2024	37 °C	27 °C
5.	5-8-2024	37 °C	26 °C
6.	6-8-2024	30 °C	25 °C
7.	7-8-2024	30 °C	25 °C
8.	8-8-2024	29 °C	26 °C
9.	0-8-2024	29 °C	26 °C
10.	10-8-2024	30 °C	25 °C

Conclusion: The maximum and minimum temperature does not at the same level during these days.

Weather depends on several factors. These temperature usually vary every day. Generally, as we approach the summer season the temperature rises and during the winter season it falls. Air temperature is an important weather parameter and is monitored at weather stations all over the world. The data gathered on air temperature along with various other parameters are used for making weather forecasts.

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