**Temperature** = reliable measure of hotness or coldness of a body.
**Thermometer** = device that measures temperature.
**Clinical Thermometer** = used to measure human body temperature (digital type is safer).
**Normal Body Temperature** = 37.0°C for a healthy person.
**Temperature Scale** = Celsius (°C) used in India and science; 1 °C = 1 degree Celsius.
**Healthy Temperature Range** = 35°C to 42°C (below or above is not normal).
**How to Use Digital Thermometer:**
1. Wash tip with soap and water
2. Place under tongue, close mouth
3. Wait for beep
4. Read number on display
5. Wash tip again with soap and water
**Why Not Touch Alone?** = Same water can feel warm to one hand and cold to another—our senses trick us.
**Old Mercury Thermometers** = Dangerous (poisonous), now replaced by digital ones.
**Factors That Change Body Temperature** = age, time of day, activity level.
**Diagrams to Remember:** Digital thermometer parts—tip, display screen, reset button.
**Don't Confuse:** Temperature (number we measure, like 37°C) ≠ Hotness (what we feel by touch).
Q1. What is the normal body temperature of a healthy human being?
Answer: A — The normal body temperature of a healthy human is 37.0°C, which is the average temperature measured in many healthy people.
Q2. Which of the following is a device used to measure temperature?
Answer: B — A thermometer is the tool designed specifically to measure the temperature of a body or substance.
Q3. Why should we not rely only on our sense of touch to decide if something is hot or cold?
Answer: B — The activity showed that the same water can feel warm to one hand (that was in cold water) and cold to another hand (that was in warm water) at the same time, proving our senses can trick us.
Q4. What is the Celsius scale used for in a clinical thermometer?
Answer: C — The Celsius scale (°C) is the temperature measurement scale used in clinical thermometers to show body temperature.
Q5. Why are digital thermometers preferred over mercury thermometers?
Answer: B — Digital thermometers are safer because mercury is a toxic substance that can harm you if accidentally released from a broken thermometer.
Q6. What should you do before using a digital clinical thermometer?
Answer: B — According to the precautions, you must wash the tip of the thermometer with soap and water before and after each use to keep it clean.
Q7. In Activity 7.1, when you dip your hands in containers A and C first, then put both in container B, what happens?
Answer: B — The hand from warm water (A) feels B as cool, while the hand from cold water (C) feels B as warm—showing our senses can give different feelings for the same water.
Q8. What is the lowest temperature that a healthy human body normally reaches?
Answer: C — The chapter states that healthy human body temperature does not normally go below 35°C.
Q9. __________ is a reliable measure of how hot or cold a body is.
Answer: B — Temperature, measured with a thermometer and shown as a number, is the reliable way to know exactly how hot or cold something is.
Q10. When measuring body temperature using a digital thermometer under the tongue, what should you do while waiting?
Answer: C — According to Activity 7.2, you must close your mouth after placing the thermometer under your tongue and wait until it makes a beeping sound.
What is temperature?
Temperature is a reliable measure of how hot or cold something is, shown as a number in degrees.
What is a thermometer?
A thermometer is a tool or device that measures the temperature of something.
What is a clinical thermometer used for?
A clinical thermometer is used to measure the body temperature of a human being.
What is the normal body temperature of a healthy person?
The normal body temperature of a healthy human is 37.0°C.
Why can we not always trust our sense of touch to know if something is hot or cold?
Our sense of touch can be tricked because the same water can feel warm to one hand and cold to another hand at the same time.
What is the Celsius scale?
The Celsius scale is a way to measure temperature where the unit is degree Celsius, written as °C.
Why are digital thermometers better than mercury thermometers?
Digital thermometers are safer because mercury is poisonous and can hurt you if the thermometer breaks.
Where should you place a digital thermometer to measure body temperature?
Place the thermometer under your tongue and close your mouth until it beeps.
What should you do with a thermometer before and after using it?
Wash the tip of the thermometer with soap and water before and after using it.
What is the range of normal body temperature in healthy humans?
A healthy human body temperature does not normally go below 35°C or above 42°C.
What is temperature? [1 mark]
Temperature is a reliable measure of how hot or cold something is; it is shown as a number using degrees (°C for Celsius).
Why can we not always trust our sense of touch to know if something is hot or cold? Explain with an example from Activity 7.1. [2 marks]
In Activity 7.1, the same water (container B) felt warm to the left hand (which was in cold water) and cool to the right hand (which was in warm water). This shows our senses can be tricked by what they felt before.
Describe the steps you would follow to measure your own body temperature using a digital clinical thermometer. Why should you wash the thermometer before and after use? [3 marks]
Steps: wash tip, reset, place under tongue, close mouth, wait for beep, read display, wash tip again. Washing prevents spreading germs and keeps the thermometer clean for accurate readings.
Draw and label a digital clinical thermometer. Explain: (a) What is the normal body temperature of a healthy human? (b) Why are digital thermometers better than mercury thermometers? (c) Why does body temperature vary slightly in different healthy people? [5 marks]
Label: tip, display screen, reset button. Normal temp = 37.0°C. Digital thermometers are safer because mercury is poisonous. Temperature varies due to age, time of day, and activity level.
True or False: A person who has a body temperature of 36.5°C must have a fever. Give a reason for your answer. [2 marks]
False—because normal body temperature is 37.0°C, but healthy people can have normal temperatures slightly lower or higher (like 36.5°C) depending on age, time of day, and activity level. A perfectly healthy person is not automatically sick with just a 36.5°C reading.
Practice with interactive flashcards, mind maps, upload your own chapters and get AI study kits instantly
Try StudyOS Free →