Class 6 Science Portal
Chapter 7: Temperature and its Measurement (NCERT / Curiosity)
SET 1: Practice Test Paper
Subject: Science | Grade: 6 | Max Marks: 40 | Time: 1.5 Hours
Section A: Multiple Choice Questions (1 Mark Each)
1. The normal temperature of a healthy human body on the Celsius scale is approximately:
Answer: (ii) 37.0°C.
Explanation: The average normal body temperature of a healthy human adult is taken to be 37.0°C[cite: 149].
Explanation: The average normal body temperature of a healthy human adult is taken to be 37.0°C[cite: 149].
2. What is the SI unit of temperature?
Answer: (iii) Kelvin.
Explanation: In scientific work, the SI unit for temperature is kelvin (denoted by K)[cite: 128].
Explanation: In scientific work, the SI unit for temperature is kelvin (denoted by K)[cite: 128].
Section B: Short Answer Questions (2 Marks Each)
3. Why can we not always rely upon our sense of touch to judge hotness or coldness? Explain with an activity reference.
Answer: Our sense of touch is subjective and relative. For example, in Activity 7.1, if we dip one hand in warm water and another in ice-cold water, and then put both in tap water, one hand feels it cool while the other feels it warm[cite: 124]. Thus, we cannot always rely on our touch[cite: 124].
4. State two precautions to be taken while using a digital clinical thermometer.
Answer:
1. Wash the tip with soap and water before and after use[cite: 127].
2. Keep the digital display portion out of water while washing[cite: 127].
2. Keep the digital display portion out of water while washing[cite: 127].
Section C: Long Answer Questions (4 Marks Each)
5. Differentiate between a clinical thermometer and a laboratory thermometer with respect to their temperature range and usage.
Answer:
- **Clinical Thermometer:** Used exclusively for measuring human body temperature[cite: 125]. Its normal range spans around 35°C to 42°C[cite: 141].
- **Laboratory Thermometer:** Used for science experiments in labs (e.g., measuring water or liquid temperatures)[cite: 125, 130]. Its typical range spans from -10°C to 110°C[cite: 143, 149].
- **Laboratory Thermometer:** Used for science experiments in labs (e.g., measuring water or liquid temperatures)[cite: 125, 130]. Its typical range spans from -10°C to 110°C[cite: 143, 149].
SET 2: Practice Test Paper
Subject: Science | Grade: 6 | Max Marks: 40 | Time: 1.5 Hours
Section A: Multiple Choice Questions (1 Mark Each)
1. 37°C on the Celsius scale is equivalent on the Fahrenheit scale to:
Answer: (iv) 98.6°F[cite: 171].
Explanation: Normal human body temperature 37.0°C corresponds exactly to 98.6°F[cite: 128, 171].
Explanation: Normal human body temperature 37.0°C corresponds exactly to 98.6°F[cite: 128, 171].
2. The typical temperature range of a laboratory thermometer is:
Answer: (ii) -10°C to 110°C[cite: 143, 171].
Section B: Short Answer Questions (2 Marks Each)
3. Why can a clinical thermometer **not** be used to measure the temperature of boiling water?
Answer: The temperature of boiling water (100°C) is well above the maximum range (42°C) of a clinical thermometer, which would cause the thermometer to break or get damaged[cite: 129, 141].
4. How do you convert Celsius temperature to Kelvin scale? Give the formula.
Answer: Temperature in Kelvin scale = Temperature in Celsius scale + 273.15[cite: 129].
Section C: Long Answer Questions (4 Marks Each)
5. List three essential rules/precautions for correctly reading a laboratory thermometer while measuring the temperature of warm water in a beaker.
Answer:
1. The thermometer must be held vertically upright and should not be tilted[cite: 132].
2. The bulb must be immersed in water but should not touch the bottom or sides of the beaker[cite: 132].
3. The reading must be taken while the thermometer is still immersed in the water, keeping the eye directly in line with the liquid level[cite: 132].
2. The bulb must be immersed in water but should not touch the bottom or sides of the beaker[cite: 132].
3. The reading must be taken while the thermometer is still immersed in the water, keeping the eye directly in line with the liquid level[cite: 132].
SET 3: Practice Test Paper
Subject: Science | Grade: 6 | Max Marks: 40 | Time: 1.5 Hours
Section A: Multiple Choice Questions (1 Mark Each)
1. What type of thermometer is usually hung on walls in hospitals and clinics to show room temperature?
Answer: (ii) Room thermometer[cite: 134].
2. What is absolute zero temperature on the Kelvin scale?
Answer: (i) 0 K[cite: 141].
Explanation: Absolute zero is close to -273.15°C or 0 kelvin[cite: 141].
Explanation: Absolute zero is close to -273.15°C or 0 kelvin[cite: 141].
Section B: Short Answer Questions (2 Marks Each)
3. Why are mercury thermometers being replaced by digital thermometers nowadays?
Answer: Mercury is an extremely toxic substance and is hazardous to dispose of if the glass thermometer breaks accidentally[cite: 126]. Digital thermometers pose no such risk and are easier to read[cite: 126].
4. What are infrared thermometers and why were they widely used during the COVID-19 pandemic?
Answer: Infrared thermometers (non-contact thermometers) measure body temperature from a distance without touching the person[cite: 126], reducing the risk of spreading infectious diseases[cite: 126].
Section C: Long Answer Questions (4 Marks Each)
5. Write a short note on the monumental contributions of Indian scientist **Anna Mani** to weather measurement instruments.
Answer: Anna Mani (1918–2001) was a celebrated Indian scientist known as the 'Weather Woman of India'[cite: 135]. She invented and built a large number of weather measurement instruments, reducing India's dependence on foreign nations[cite: 135]. She also pioneered research in wind and solar energy, helping position India as a global leader in renewable energy[cite: 135].
SET 4: Practice Test Paper
Subject: Science | Grade: 6 | Max Marks: 40 | Time: 1.5 Hours
Section A: Multiple Choice Questions (1 Mark Each)
1. The hotness or coldness of a body is reliably determined by its:
Answer: (ii) Temperature[cite: 125].
2. What happens to the temperature of water while it is boiling or ice while it is melting?
Answer: (ii) Remains constant[cite: 133].
Section B: Short Answer Questions (2 Marks Each)
3. Why is pulse rate alone not considered a reliable indicator of fever in olden medicine?
Answer: Although fever affects pulse rate, several other physical conditions and emotional factors can also alter pulse rate, making it unreliable on its own[cite: 129].
4. How is the temperature of small children or old people sometimes measured if placing under the tongue is difficult? How does it compare?
Answer: It can be placed in the armpit[cite: 128]. The temperature measured this way is about 0.5°C to 1°C lower than the actual body core temperature[cite: 128].
Section C: Long Answer Questions (4 Marks Each)
5. Explain how to calculate the smallest value (least count) that a given laboratory thermometer can measure.
Answer:
1. Note the temperature difference between two consecutive bigger marks (e.g., between 0°C and 10°C, difference is 10°C)[cite: 131].
2. Count the number of smaller divisions between these two bigger marks (e.g., 10 divisions)[cite: 131].
3. Divide the temperature difference by the number of small divisions: Value = 10°C / 10 = 1°C per small division[cite: 131].
2. Count the number of smaller divisions between these two bigger marks (e.g., 10 divisions)[cite: 131].
3. Divide the temperature difference by the number of small divisions: Value = 10°C / 10 = 1°C per small division[cite: 131].
SET 5: Practice Test Paper
Subject: Science | Grade: 6 | Max Marks: 40 | Time: 1.5 Hours
Section A: Multiple Choice Questions (1 Mark Each)
1. If a laboratory thermometer has 50 equal divisions between 0°C and 100°C, what does each division measure?
Answer: (iii) 2.0°C[cite: 140].
Explanation: 100°C / 50 divisions = 2.0°C per division[cite: 140].
Explanation: 100°C / 50 divisions = 2.0°C per division[cite: 140].
2. Which of the following scientists is the Fahrenheit temperature scale named after?
Answer: (ii) Daniel Gabriel Fahrenheit[cite: 129].
Section B: Short Answer Questions (2 Marks Each)
3. What are the formatting conventions for writing temperature units like degree Celsius and Kelvin (capitalization and degree signs)?
Answer: The word 'degree' starts with a lowercase letter while Celsius/Fahrenheit start with uppercase (°C, °F)[cite: 129]. Kelvin starts with a lowercase 'k' (symbol K) and no degree sign (°) is written with K[cite: 129].
4. Why does the liquid column in a laboratory thermometer begin to fall as soon as it is taken out of warm water?
Answer: Unlike clinical thermometers which have a constriction to hold the reading, laboratory thermometers lack this feature, causing the liquid column to drop immediately when removed from the heat source[cite: 132].
Section C: Long Answer Questions (4 Marks Each)
5. Discuss why body temperatures of healthy humans vary slightly across individuals and are influenced by external factors.
Answer: The normal temperature 37.0°C is merely the average body temperature of a large group of healthy people[cite: 128]. A perfectly healthy individual can have a slightly different temperature because body temperature is influenced by age, time of day, and physical activity level[cite: 128].
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