Class 6 Science Chapter 7 Extra Questions Temperature and its Measurement
Class 6 Science Chapter 7 Temperature and its Measurement Important Extra Questions and Answers
Temperature and its Measurement Class 6 Extra Questions Very Short Answer Type
Question 1.
Which temperature scale has no negative values and why?
Answer:
The kelvin scale has no negative values because it starts from absolute zero, which is the lowest possible temperature.
Question 2.
Write the units of temperature along with their symbols.
Answer:
Kelvin (K), degree Fahrenheit (°F) and degree Celsius (°C).
Question 3.
What are the two types of thermometers? Also, mention the range of the two.
Ans.
(i) Clinical thermometer: 35°C to 42°C
(ii) Laboratory thermometer: -10°C to 110°C
Question 4.
Where can a digital clinical thermometer be placed for measuring the body temperature of small children or old people?
Answer:
For measuring the body temperature of small children or old people, the digital thermometer can be placed in the rectum, mouth or armpit.
Question 5.
Which type of thermometers were used during the COVID-19 pandemic?
Answer:
Non-contact thermometers, also called infrared thermometers were used during the COVID-19 pandemic.
Question 6.
How does the temperature in a digital thermometer determined?
Answer:
Temperature in a digital thermometer is determined with the help of heat sensors.
Question 7.
What is the principle of working of a mercury thermometer?
Answer:
Mercury thermometer works on the principle of thermal expansion of liquids.
Question 8.
Why is it advised not to hold the thermometer by its bulb?
Answer:
It is advised not to hold the thermometer by its bulb as the actual reading can fluctuate due to the temperature of our hand.
Question 9.
Why a clinical thermometer is not used to measure the temperature of ice?
Answer:
A clinical thermometer is not used to measure the temperature of ice because the temperature of ice is 0° C which is outside the range of a clinical thermometer.
Question 10.
Which two liquids are generally used in a laboratory thermometer?
Answer:
The liquids used in the laboratory thermometer are generally alcohol and mercury.
Temperature and its Measurement Class 6 Extra Questions Short Answer Type
Question 1.
Why is the range of a clinical thermometer kept between 35° C to 42° C ?
Answer:
The clinical thermometer is designed to measure the temperature of human body only. The temperature of human body normally does not go below 35° C or above 42° C. This is the reason that clinical thermometer has the range from 35° C to 42° C.
Question 2.
Write the precautions to be taken while using a digital clinical thermometer.
Answer:
Refer to text 7.3 Precautions to be taken while using a digital clinical thermometer.
Question 3.
Why does the temperature of a substance remains constant during melting and boiling even when heat is being supplied to it’continuously?
Answer:
The temperature of a substance remains constant during melting and boiling even when heat is being supplied to it continuously because the heat that is supplied is being used up in changing the state of matter by overcoming the intermolecular force of attraction.
Question 4.
Write a short note on air temperature and its measurement.
Answer:
Air temperature is a measure of how hot or cold the air is. It is the most commonly measured weather parameter. Air temperature can be measured in numerous way inducing maximum and minimum thermometer, thermistor, etc.
Question 5.
Calculate the boiling point of water in kelvin.
Answer:
Boiling point of water is 100° C.
We know,
K =° C + 273.15
= 100 + 273.15 = 373.15 ~K
Question 6.
What conclusion can be drawn, if the temperature of a patient is (i) 40° C (ii) 35.5° C.
Answer:
(i) If the temperature of a patient is 40° C, it means that the person is suffering from fever.
(ii) If the temperature of a patient is 35.5° C, it means that the person’s body does not generate enough heat.
Question 7.
You want to quickly check the soup’s temperature without using a thermometer. Which of the following methods could give you a rough idea of the temperature: tasting, touching the pot, or observing steam? Justify your answer.
Answer:
Observing steam rising from the soup can give a rough idea that the temperature is close to or above 100° C. Water starts to boil at 100° C and slowly converts into gaseous state. Therefore, formation of steam indicates that the temperature of the soup is around 100° C. However, using a thermometer is the most accurate and safest method.
Question 8.
Explain why mercury thermometers are being replaced by digital thermometers.
Answer:
Mercury is an extremely toxic substance and is difficult to dispose off, if the thermometer breaks accidently. Digital thermometers pose no such risks and also the numbers in its display are easier to read. Therefore, mercury thermometers are being replaced by digital thermometers.
Temperature and its Measurement Class 6 Extra Questions Long Short Answer Type
Question 1.
Explain the structure of a laboratory thermometer.
Answer:
A laboratory thermometer consists of a long, narrow, uniform glass tube which is sealed. A bulb is present at one end of the tube which contains a liquid. In the tube, a narrow column of liquid can be seen. There is a Celsius scale marked along the tube. The liquid column rises or falls with change in temperature. The mark on the Celsius scale with which the top level of the liquid column coincides is the temperature reading.
Question 2.
Is the body temperature of every human 37° C ? Justify your answer.
Answer:
The temperature of every human may not be 37° C. What we call a normal temperature is the average body temperature of a large number of healthy people. A perfectly healthy person may have a normal temperature slightly different from 37,0° C. The body temperature of every human is not 37° C because it is influenced by several factors, such as age, time of the day and activity level.
Question 3.
Write the correct ways of measuring temperature using a laboratory thermometer.
Answer:
- When the thermometer is immersed in water, its bulb should not touch the bottom or the sides of the beaker.
- The thermometer should be held vertically. It should not be tilted.
- The temperature must be read while the thermometer is immersed in water.
- While reading the thermometer, the eye should be directly in line with the level of the liquid column to be read.
Question 4.
Write an activity to find the lowest temperature that a laboratory thermometer can measure.
Answer:
Activity :
- Take a laboratory thermometer and observe it carefully.
- Note the temperature difference between two bigger marks. Let say it is 10° C.
- Also, note the number of divisions between these marks. Let say there are 10 divisions.
- So, one small division can read 10 / 10 = 1° C.
- Therefore, the smallest value that this thermometer can read is 1° C.
Question 5.
Why mercury is preferred in most of the thermometers?
Answer:
Mercury is in liquid state at room temperature. It is used in thermometers because
- It expands even for a slight change in temperature.
- It also has a high boiling point which makes it suitable for measuring higher temperatures.
- It does not stick to the glass of the thermometer tube which helps in getting almost correct reading of temperature.
Temperature and its Measurement Class 6 Extra Questions Skill Based
Question 1.
Which out of the following thermometers can most easily read the temperature 22° C. Color the red column on the drawing of all the thermometers to represent 22° C. Thlnking Skill
Question 2.
Use the diagram of the Celsius thermometers to answer the following- Analytical skill
(i) (a) Which thermometer diagram A, B, C and D would you guess to be the average thermometer reading for a comfortable room?
Answer:
diagram D
(b) What is the average thermometer reading for a comfortable room on a Fahrenheit thermometer scale?
Answer:
around 71.6 fahrenheit
(ii) (a) Which thermometer diagram A, B, C, and D show is the average body temperature reading?
Answer:
(a) (c)
(b) What is the average body temperature reading on a Fahrenheit thermometer scale?
Answer:
98.6
Question 3.
Find out the words from the puzzle by using the hints given below. Thinking Skill
(a) A scale for measuring temperature having minimum temperature as 0 .
(b) A thermometric fluid
(c) Non-contact thermometers
(d) A thermometer measures human body temperature
(e) Most commonly used unit of temperature
