Created by Bodhiclasses – Simplifying Science for Young Learners | Temperature and Its Measurement
Instructions:
- Time: 45 minutes
- Maximum Marks: 30
- All questions are compulsory. Attempt every section carefully.
Section A: Multiple Choice Questions for Temperature and Its Measurement (1 mark each)
Choose the correct option.
- What is the normal body temperature of a human being in Celsius?
(A) 37.5 °C
(B) 37.0 °C
(C) 36.5 °C
(D) 35.0 °C - The SI unit of temperature is:
(A) Celsius
(B) Fahrenheit
(C) Degree
(D) Kelvin - Which thermometer is used in hospitals to measure body temperature?
(A) Laboratory thermometer
(B) Clinical thermometer
(C) Room thermometer
(D) Barometer - The temperature at which water boils in Celsius is:
(A) 0 °C
(B) 50 °C
(C) 100 °C
(D) 273 °C - Mercury thermometers are being replaced because mercury is:
(A) Cheap
(B) Harmless
(C) Toxic
(D) Cold - What scale is used in most scientific temperature measurement?
(A) Celsius
(B) Kelvin
(C) Fahrenheit
(D) Newton - Which device is used to measure air temperature?
(A) Digital thermometer
(B) Clinical thermometer
(C) Room thermometer
(D) Barometer - A thermometer should be read:
(A) While in the mouth
(B) While immersed
(C) After shaking it
(D) When kept on a table - Which thermometer can read temperature from a distance?
(A) Mercury thermometer
(B) Digital thermometer
(C) Infrared thermometer
(D) Laboratory thermometer - What is the freezing point of water in Celsius?
(A) 100 °C
(B) –10 °C
(C) 37 °C
(D) 0 °C
Section B: True/False for Temperature and Its Measurement (1 mark each)
- Digital thermometers contain mercury.
- Clinical thermometers have a range of –10 °C to 110 °C.
- The temperature should be read while the thermometer is still immersed in water.
- 98.6 °F equals 37 °C.
- Infrared thermometers were used widely during COVID-19.
- Fahrenheit scale is widely used in scientific studies.
- Laboratory thermometers can be used to check body temperature.
- The thermometer should be held vertically while measuring.
- Temperature can be felt accurately by touch.
- Kelvin scale starts at absolute zero.
Section C: One Mark Questions on Temperature and Its Measurement (1 mark each)
- Define temperature.
- What is the full form of °C?
- Name the scientist known as the “Weather Woman of India.”
- What is the temperature of boiling water in °C?
- Which thermometer is used in experiments?
- What does an infrared thermometer do?
- What is the unit of Kelvin scale?
- Name one reason digital thermometers are better than mercury ones.
- What should you do before and after using a thermometer?
- What is the average temperature of a healthy human body in Fahrenheit?
Section D: Two Mark Questions on Temperature and Its Measurement(2 marks each)
- Mention any two precautions while using a clinical thermometer.
- How does a digital thermometer work?
- Why can’t we use a clinical thermometer to measure boiling water?
- What is the difference between Celsius and Kelvin scales?
- How does our body temperature vary throughout the day?
Section E: HOTS – Higher Order Thinking Skills (2 marks each)
- A student measures boiling water with a clinical thermometer and it breaks. What might have gone wrong and why is this dangerous?
- Why is it important to hold the thermometer vertically while reading?
- Explain with reason: A body at 98.6 °F is healthy, but at 101 °F has fever.
- What would happen if someone uses a laboratory thermometer to check body temperature and forgets to read it immediately?
- Why is Celsius scale preferred in weather reports instead of Fahrenheit?
🧾 Answer Key – Solution Paper
Section A: MCQs
- (B) 37.0 °C
- (D) Kelvin
- (B) Clinical thermometer
- (C) 100 °C
- (C) Toxic
- (B) Kelvin
- (C) Room thermometer
- (B) While immersed
- (C) Infrared thermometer
- (D) 0 °C
Section B: True/False
- ❌ False
- ❌ False
- ✅ True
- ✅ True
- ✅ True
- ❌ False
- ❌ False
- ✅ True
- ❌ False
- ✅ True
Section C: One Mark Answers
- Temperature is the measure of hotness or coldness of a body.
- Degree Celsius
- Anna Mani
- 100 °C
- Laboratory thermometer
- It measures temperature without touching the body.
- Kelvin (K)
- It is safer, does not use toxic mercury.
- Wash and dry the tip with soap and water.
- 98.6 °F
Section D: Two Mark Answers
- (i) Do not hold from the bulb.
(ii) Read temperature at eye level while immersed. - It uses sensors to detect heat and displays temperature on a screen.
- Clinical thermometers can break as they are not designed for high temperatures like boiling water.
- Celsius uses °C and starts at 0, while Kelvin uses K and starts at absolute zero (–273.15 °C).
- It fluctuates slightly based on activity, time of day, and metabolism.
Section E: HOTS
- Clinical thermometers are not meant for high temperatures; mercury can leak and is highly poisonous.
- To prevent parallax error and get a correct reading.
- Because 98.6 °F is the standard average, anything above may indicate fever or infection.
- The reading may drop immediately, giving a wrong value.
- Celsius is simpler for everyday use and is part of the metric system used globally.
