Mastery

Temperature and its Measurement — Mastery

30 questions 30 min Full-chapter mastery

Q1. In the opening of the chapter, Lambok and his elder sister Phiban live in
- A. Mumbai
- B. Chennai
- C. Jaipur
- D. Shillong
Q2. Two bodies P and Q are at temperatures 30 degrees C and 45 degrees C respectively. From this, we can say that
- A. Q is hotter than P, because a hotter body has a higher temperature
- B. P is hotter than Q, because lower numbers mean hotter bodies
- C. P and Q are equally hot
- D. Hotness cannot be compared from these readings
Q3. From Activity 7.1 in the chapter, what is the main conclusion drawn?
- A. Touch is the most accurate way to find temperature
- B. Cold water always feels warm
- C. Warm water and ice-cold water feel the same
- D. We cannot always rely on the sense of touch to decide whether a body is hot or cold
Q4. In a laboratory thermometer, the liquid is contained inside the
- A. Display unit at the top of the tube
- B. Bulb at one end of the glass tube
- C. Plastic handle of the thermometer
- D. Outer rubber cap
Q5. In a laboratory thermometer, the temperature reading is taken at the mark of the Celsius scale that
- A. Lies in the middle of the bulb
- B. Lies at the lowest visible point of the liquid column
- C. Coincides with the top level of the liquid column
- D. Lies at the bottom of the tube
Q6. The 'smallest value' that a laboratory thermometer can read is best described as
- A. The temperature shown by the bulb
- B. The temperature represented by one small division of its scale
- C. The lowest temperature in its range
- D. The highest temperature in its range
Q7. While measuring the temperature of warm water, a student tilts the laboratory thermometer to one side. The chapter advises against this because
- A. The bulb would freeze
- B. The thermometer should be held vertically; tilting it gives an incorrect reading
- C. The Celsius scale becomes negative when tilted
- D. Tilted thermometers always break
Q8. On a laboratory thermometer, the temperature difference between two consecutive bigger marks is 10 degrees C. Between these two bigger marks, there are 5 small divisions. What is the smallest value this thermometer can read?
- A. 0.5 degrees C
- B. 1.0 degrees C
- C. 5.0 degrees C
- D. 2.0 degrees C
Q9. Komal's father has a friend in another country who tells him his fever is 100.4 degrees F. From the chapter, what is the closest Celsius value he should compare it with?
- A. Below 37.0 degrees C, so no fever
- B. About 37.0 degrees C, so normal
- C. Cannot be compared without converting to kelvin
- D. Above 37.0 degrees C, so the friend has a fever
Q10. Using the formula Temperature in kelvin = Temperature in degrees C + 273.15, the normal body temperature 37.0 degrees C in kelvin is approximately
- A. 273.15 K
- B. 236.15 K
- C. 310.15 K
- D. 337.00 K
Q11. Consider the following statements about the limits of temperature, based on the chapter. I. The temperature at the core of the Sun reaches as high as 15 million degrees Celsius. II. There is no limit on the highest temperature that can exist. III. There is a limit to the lowest temperature, close to -273.15 degrees C. Which are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q12. A Class 6 student in Bhopal insists, 'My touch can always tell whether water is hot or cold.' Which of the following is the BEST way for the teacher to address this misconception?
- A. Tell the student she is simply wrong and move on
- B. Let her conduct Activity 7.1 with three containers and observe whether the same container B feels different to her two hands
- C. Give her a worksheet with definitions of hot and cold
- D. Ask her to memorise that touch is unreliable
Q13. Before students take readings with a digital clinical thermometer, the BEST first step for a Class 6 teacher is to
- A. Let the children share one thermometer in random order
- B. Ask each child to memorise 98.6 degrees F first
- C. Ask the class to read the instruction manual of the thermometer together and discuss the precautions
- D. Skip the precautions and start measuring immediately
Q14. Ravi notices that his temperature taken just after running is slightly higher than his temperature taken early in the morning. According to the chapter, this difference is best explained by
- A. His thermometer being faulty
- B. Body temperature being influenced by age, time of the day and activity level
- C. Different colour of his clothes
- D. Different size of his classroom
Q15. Before thermometers were developed, fever was sometimes detected by the pulse rate of a person. However, the chapter cautions that
- A. Pulse rate is the most reliable indicator of fever
- B. Pulse rate never changes during fever
- C. Pulse rate cannot be felt during fever
- D. Pulse rate alone is not a reliable indicator of fever, as some other situations also affect it
Q16. Asha gives the following list of 'do nots' for a digital clinical thermometer. Which one matches the chapter's precaution box?
- A. Do not use the thermometer in dim light
- B. Do not let any classmate read it
- C. Do not hold the thermometer by the tip
- D. Do not write the reading in your notebook
Q17. In a digital thermometer, the temperature is determined with the help of
- A. Heat sensors
- B. Magnets inside the bulb
- C. A small mirror near the tip
- D. Sound waves from the display
Q18. A nurse in a primary school in Pune finds that the normal body temperature of small children is sometimes slightly higher than that of healthy young adults. From the chapter, this is best explained by
- A. Errors in the thermometer
- B. Errors made by the nurse
- C. Children always running a low-grade fever
- D. Body temperature being influenced by factors such as age
Q19. The chapter asks whether old, healthy people generally have lower body temperatures than young adults. The correct stance from the chapter is that
- A. Body temperature is the same for every age
- B. Body temperature depends on age, time of the day and activity, so older healthy people may have a slightly lower normal temperature
- C. Only old people have body temperatures of 37.0 degrees C exactly
- D. Body temperature has nothing to do with age
Q20. Consider the following statements comparing mercury and digital clinical thermometers from the chapter. I. Mercury is an extremely toxic substance. II. The numbers on the display of a digital thermometer are easier to read. III. Mercury thermometers are being widely replaced by digital ones. Which are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q21. Inside a laboratory thermometer, alcohol is often coloured red. The most likely reason for this colouring is to
- A. Make the alcohol non-toxic
- B. Increase the boiling point of alcohol
- C. Lower the freezing point of alcohol
- D. Make the liquid column easily visible against the scale
Q22. Assertion (A): Two laboratory thermometers can have the same range but different smallest values. Reason (R): The smallest value depends on the number of small divisions between consecutive bigger marks of the Celsius scale.
- A. Both A and R are true, and R is the correct explanation of A.
- B. Both A and R are true, but R is NOT the correct explanation of A.
- C. A is true, R is false.
- D. A is false, R is true.
Q23. According to the chapter, in most scientific studies today, which scale of temperature is generally not used?
- A. Fahrenheit scale
- B. Celsius scale
- C. Kelvin scale
- D. Every scale is used equally
Q24. The three temperature scales — Celsius, Fahrenheit and Kelvin — are named in honour of the scientists who
- A. First discovered fire
- B. Invented the steam engine
- C. Developed these scales
- D. Founded the SI unit system
Q25. Consider the following statements about absolute zero, based on the chapter. I. Absolute zero is close to -273.15 degrees C. II. Absolute zero corresponds to 0 K on the Kelvin scale. III. There are bodies in the universe colder than absolute zero. Which are correct?
- A. I and II only
- B. II and III only
- C. I and III only
- D. All three
Q26. Air temperature is an important weather parameter and is monitored at weather stations all over the world. The data on air temperature, along with other parameters, is used mainly for
- A. Designing thermometers
- B. Making weather forecasts
- C. Setting the SI unit of temperature
- D. Naming temperature scales
Q27. Apart from building weather instruments, Anna Mani also explored the possibilities of
- A. Coal-based power plants
- B. Diesel engines
- C. Using wind and solar energy in India
- D. Building nuclear submarines
Q28. A Class 6 teacher in Lucknow wants to assess whether students have understood air temperature and weather. Which of the following assessment tasks BEST connects this chapter to real-life data?
- A. A multiple-choice quiz on the SI unit of temperature
- B. A homework sheet of definitions of 'thermometer' and 'temperature'
- C. Having students read weather reports for ten successive days and record maximum and minimum temperatures in Table 7.3
- D. Asking students to memorise Anna Mani's date of birth
Q29. While giving a hands-on session on the laboratory thermometer, a teacher in Patna tells students two precautions. Which pair correctly reflects the chapter's precaution box?
- A. Run with the thermometer; hold it by the bulb
- B. Handle with care because it can break if it hits something hard; do not hold it by the bulb
- C. Heat it on a candle first; clean it with petrol
- D. Hold the bulb tightly; tap it on the desk before use
Q30. Based on the chapter's discussion of the limits of temperature, which of the following lists is in the correct order from coldest to hottest?
- A. Core of the Sun, boiling water, normal body temperature, absolute zero
- B. Normal body temperature, absolute zero, boiling water, core of the Sun
- C. Absolute zero, core of the Sun, boiling water, normal body temperature
- D. Absolute zero, normal body temperature, boiling water, core of the Sun

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