At Bodhiclasses, we believe in making science engaging and crystal-clear. These additional practice questions help reinforce key concepts from NCERT Chapter 7: Temperature and Its Measurement, offering a blend of multiple choice, True/False, short answers, and HOTS (Higher Order Thinking Skills) to sharpen understanding.
MCQs – Multiple Choice Questions of Temperature and Its Measurement
- Which instrument is used to measure the temperature of a human body?
(A) Barometer
(B) Thermometer
(C) Hygrometer
(D) Anemometer
✅ Answer: (B) Thermometer - The SI unit of temperature is:
(A) Celsius
(B) Fahrenheit
(C) Kelvin
(D) Degree
✅ Answer: (C) Kelvin - The normal body temperature in Fahrenheit is:
(A) 100 °F
(B) 98.6 °F
(C) 96.4 °F
(D) 37.0 °F
✅ Answer: (B) 98.6 °F - Which thermometer is best for checking body temperature from a distance?
(A) Mercury thermometer
(B) Laboratory thermometer
(C) Digital thermometer
(D) Infrared thermometer
✅ Answer: (D) Infrared thermometer - What does the red liquid inside most lab thermometers represent?
(A) Water
(B) Oil
(C) Alcohol
(D) Blood
✅ Answer: (C) Alcohol - A thermometer must be held:
(A) Horizontally
(B) Tilted
(C) Vertically
(D) Inverted
✅ Answer: (C) Vertically - What is the temperature range of a clinical thermometer?
(A) 0 °C to 100 °C
(B) 35 °C to 42 °C
(C) –10 °C to 110 °C
(D) 32 °F to 100 °F
✅ Answer: (B) 35 °C to 42 °C - Which of the following is a non-contact thermometer?
(A) Laboratory thermometer
(B) Clinical mercury thermometer
(C) Infrared thermometer
(D) None of the above
✅ Answer: (C) Infrared thermometer - Who is known as the “Weather Woman of India”?
(A) Kalpana Chawla
(B) Indira Gandhi
(C) Anna Mani
(D) Ritu Karidhal
✅ Answer: (C) Anna Mani - Which of these is NOT a correct temperature scale?
(A) Celsius
(B) Kelvin
(C) Newton
(D) Fahrenheit
✅ Answer: (C) Newton
True/False Questions for Temperature and Its Measurement
- Clinical thermometers are used to measure weather temperature.
❌ False - Kelvin is the SI unit of temperature.
✅ True - Mercury thermometers are safer than digital ones.
❌ False - Temperature of boiling water can be measured using a clinical thermometer.
❌ False - Laboratory thermometers contain alcohol or mercury.
✅ True - Digital thermometers give quick and safe readings.
✅ True - Fahrenheit scale is widely used in scientific research.
❌ False - Infrared thermometers can detect temperature without touching the object.
✅ True - Body temperature never goes above 42 °C.
✅ True - Celsius scale is used in everyday weather forecasts.
✅ True
One Mark Questions with Answers
- What is the SI unit of temperature?
→ Kelvin (K) - What is the normal body temperature in Celsius?
→ 37.0 °C - Name the thermometer used in laboratories.
→ Laboratory thermometer - What is the substance filled in most traditional clinical thermometers?
→ Mercury - What type of thermometer is used during a pandemic?
→ Infrared thermometer - Name one non-contact thermometer.
→ Infrared thermometer - Which scientist is known as the ‘Weather Woman of India’?
→ Anna Mani - Which scale does not use the degree symbol?
→ Kelvin - What is the freezing point of water in Celsius?
→ 0 °C - What is the boiling point of water in Celsius?
→ 100 °C - How is temperature written with its unit?
→ Example: 37 °C (with space between number and unit) - Which thermometer is unsafe if broken?
→ Mercury thermometer - What is the full form of °C?
→ Degree Celsius - Which thermometer has a range from –10 °C to 110 °C?
→ Laboratory thermometer - Which scale is most commonly used in weather reporting?
→ Celsius scale
Two Mark Questions with Answers
- Why should the thermometer be held vertically while measuring temperature?
→ To avoid parallax error and get an accurate reading. - What precautions should be taken while using a laboratory thermometer?
→ Do not touch the bulb to surfaces; hold it vertically; read while immersed. - Why are digital thermometers preferred over mercury thermometers?
→ They are safer, quicker, and easier to read. - Write the formula to convert Celsius into Kelvin.
→ K = °C + 273.15 - What are the three temperature scales used in science?
→ Celsius (°C), Fahrenheit (°F), and Kelvin (K) - Why is mercury not used in modern thermometers?
→ It is toxic and hazardous when spilled. - Mention two differences between clinical and laboratory thermometers.
→ Clinical: 35–42 °C range, used on humans; Lab: –10 to 110 °C, used in labs. - What is meant by ‘normal body temperature’?
→ The average temperature of a healthy human, 37 °C or 98.6 °F. - How is a digital thermometer used?
→ Place under the tongue/armpit, wait for beep, and read the display. - Can we use a lab thermometer to measure body temperature? Why/why not?
→ No, because it must be read while immersed, and it has a larger temperature range.
HOTS (Higher Order Thinking Skills) Questions with Answers
- If a person’s temperature is 99.5 °F, is it fever? Justify using scale conversion.
→ 99.5 °F ≈ 37.5 °C. Slightly above 37.0 °C suggests mild fever. - Why does the same water feel hot to one hand and cold to the other in Activity 7.1?
→ Because touch is subjective; prior exposure changes perception—scientific measurement is objective. - What would happen if the thermometer bulb touches the beaker’s bottom while measuring water temperature?
→ It may give an incorrect reading due to direct contact with the hot surface. - Suggest improvements to traditional mercury thermometers for safer use.
→ Use alcohol-based or digital thermometers with plastic casing and audible signals. - How does accurate temperature measurement impact health and science?
→ It helps diagnose illnesses, monitor weather, and perform precise experiments.
