CBSE Important Questions Class 6 Science Chapter 7 – Temperature and its Measurement

Class 6 Science Chapter 7 Temperature and its Measurement is part of the new NCERT textbook Curiosity. It teaches students that temperature is the measure of how hot or cold something is, and that we need a thermometer to measure it correctly instead of just touching. Students learn about the clinical thermometer used for the human body, the laboratory thermometer used in experiments, digital thermometers, and the Celsius, Fahrenheit and Kelvin scales.

These CBSE important questions for Class 6 Science Chapter 7 cover why air temperature matters for weather, how a clinical thermometer works and what its parts are, the differences between clinical and laboratory thermometers, how to take an accurate reading with a digital thermometer, and converting temperatures between Celsius, Fahrenheit and Kelvin. Every question has a clear step-by-step answer in simple English, so students can practise on their own, parents can check the working, and teachers can use them for class tests. A free printable PDF of these important questions is also available on this page.

Q1. Why is air temperature an important weather parameter?

Answer: Air temperature tells us how hot or cold the air is, and many things in the weather depend on it.
• Warm air rises and cool air moves in to take its place. This movement of air is wind.
• Warm air can hold more water vapour. When this air cools, the vapour turns into rain or snow.
• Very high or very low temperatures affect crops, animals and people. Heatwaves can cause heatstroke and cold waves can cause hypothermia.
• Weather forecasters use air temperature to predict storms, winds and rain, so that people can prepare in advance.

Q2. How does a clinical thermometer indicate body temperature?

Answer: A clinical thermometer has a thin glass tube with a bulb at one end filled with mercury (or a coloured liquid). When the bulb is placed under the tongue or in the armpit, the heat of the body makes the liquid expand and rise up the tube. The level reached by the liquid is read on the scale marked along the tube. We wait for about a minute until the liquid stops rising, and then read the temperature. The normal body temperature is about 37 °C.

Q3. What is the main use of a clinical thermometer?
(a) Measuring room temperature
(b) Measuring body temperature
(c) Measuring water temperature
(d) Measuring air pressure

Answer: (b) Measuring body temperature
A clinical thermometer is made only for the human body. Its scale runs from 35 °C to 42 °C, which is the range of human body temperature.

Q4. Which of these is NOT a temperature scale?
(a) Celsius
(b) Fahrenheit
(c) Kelvin
(d) Newton

Answer: (d) Newton
Celsius, Fahrenheit and Kelvin are the scales used to measure temperature. Newton is the unit of force, not a temperature scale.

Q5. What is the freezing point of water on the Celsius scale?
(a) 0 °C
(b) 32 °C
(c) 100 °C
(d) −273 °C

Answer: (a) 0 °C
Water freezes into ice at 0 °C and boils at 100 °C on the Celsius scale. On the Fahrenheit scale the freezing point is 32 °F.

Q6. Neha visited the doctor because she was feeling unwell. The doctor used a clinical thermometer to check her body temperature. Neha was curious about how the thermometer worked and what parts made up the device. Later, in her science class, she also learned about the laboratory thermometer used in experiments and wondered how it was similar to or different from the clinical thermometer.
(a) Name the components of a clinical thermometer.
(b) Write two similarities and two differences between a laboratory thermometer and a clinical thermometer.

Answer: (a) A clinical thermometer has a long, narrow glass tube of uniform width, a bulb at one end filled with mercury, a small bend called a kink just above the bulb, and a scale marked from 35 °C to 42 °C along the tube.
(b) Similarities: 1. Both use mercury (or a similar liquid) to show the temperature. 2. Both are made of a glass tube with a bulb.
Differences: 1. A laboratory thermometer reads from −10 °C to 110 °C, while a clinical thermometer reads only from 35 °C to 42 °C. 2. In a laboratory thermometer the mercury falls on its own when it is taken out, but a clinical thermometer has a kink that stops the mercury from falling back, so the reading can be taken after removing it from the mouth.

Q7. In a science class, students use a digital thermometer to measure the temperature of water in different containers.
(a) Why is it important to use a digital thermometer for accurate readings?
(b) What should students do to ensure they get an accurate temperature reading?

Answer: (a) A digital thermometer shows the temperature as a number on a small screen, so there is no mistake in reading the scale. It gives a quick and exact reading, and it has no mercury, which makes it safer for students.
(b) The tip of the thermometer should be fully dipped in the water but must not touch the bottom or the sides of the container. Students should wait until the number on the screen stops changing, and only then note the reading.

Q8. Can you name a situation where measuring temperature is important?

Answer: Cooking is one situation where measuring temperature is important. When we bake a cake, the oven must be at the right temperature. If it is too low the cake does not rise properly, and if it is too high the cake burns outside while staying raw inside. Other examples are checking body temperature during fever, and keeping a refrigerator cold enough to stop food from spoiling.

Q9. If the relation between the Celsius and Fahrenheit scales is given by C/5 = (F − 32)/9, then the temperature equivalent to 11 °C on the Fahrenheit scale would be
(a) 45.2
(b) 51.8
(c) −12.2
(d) 49.6

Answer: (b) 51.8
C/5 = (F − 32)/9
11/5 = (F − 32)/9
2.2 × 9 = F − 32
19.8 = F − 32
F = 19.8 + 32 = 51.8 °F

Q10. Arun is feeling low as if he has a fever and his body temperature is found to be 18 °C. His body temperature on the Kelvin scale would be
(a) 281
(b) 301
(c) 291
(d) 311

Answer: (c) 291
Temperature in Kelvin = Temperature in Celsius + 273
= 18 + 273 = 291 K

Q11. Convert 383.33 K into degrees Celsius.
(a) 110.18 °C
(b) 656.48 °C
(c) 283.33 °C
(d) 183.33 °C

Answer: (a) 110.18 °C
Temperature in Celsius = Temperature in Kelvin − 273.15
= 383.33 − 273.15 = 110.18 °C

Q12. When temperatures on different scales are compared, a temperature of 222 on the Celsius scale is equal to a temperature of ........... on the Kelvin scale.
(a) 595.15 K
(b) −51.15 K
(c) 435.15 K
(d) 495.15 K

Answer: (d) 495.15 K
K = °C + 273.15
= 222 + 273.15 = 495.15 K

Related Study Material on Extramarks

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