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Q1. The degree of hotness or coldness of a body is called its:
Temperature is a measure of how hot or cold an object or substance is. It is determined by the average kinetic energy of the particles in the substance. The higher the temperature, the faster the particles move.
Q2. The SI unit of temperature is the:
The SI unit of temperature is the Kelvin (K). It is the base unit of temperature in the International System of Units. The Kelvin scale starts at absolute zero, which is the point where particles have minimum possible energy.
Q3. The scale of temperature that is commonly used in our daily life is the:
The Celsius scale is the most commonly used temperature scale in our daily life. It is used in weather reports, cooking and many other everyday applications. On this scale, the freezing point of water is 0°C and the boiling point is 100°C.
Q4. The temperature scale where water freezes at 0°C and boils at 100°C is the:
The Celsius scale, also called the centigrade scale, has 0°C as the freezing point of water and 100°C as the boiling point of water at standard atmospheric pressure. It is named after the Swedish astronomer Anders Celsius. This scale is widely used around the world.
Q5. The temperature scale where water freezes at 32°F and boils at 212°F is the:
The Fahrenheit scale is commonly used in the United States for weather and cooking. On this scale, water freezes at 32°F and boils at 212°F at standard atmospheric pressure. It was developed by Gabriel Fahrenheit in 1724.
Q6. The unit of temperature on the Celsius scale is called:
The unit of temperature on the Celsius scale is called degree Celsius (°C). It is used to measure temperature in most parts of the world. The term “degree” indicates a specific temperature level on the scale.
Q7. The unit of temperature on the Fahrenheit scale is called:
The unit of temperature on the Fahrenheit scale is called degree Fahrenheit (°F). It is used mainly in the United States and a few other countries. The degree Fahrenheit is a smaller unit than the degree Celsius.
Q8. The device used to measure temperature is called a:
A thermometer is an instrument used to measure temperature. It works on the principle that liquids like mercury or alcohol expand when heated and contract when cooled. Different types of thermometers are used for different purposes.
Q9. A thermometer used to measure the temperature of the human body is called a:
A clinical thermometer is specially designed to measure the temperature of the human body. It has a narrow range from about 35°C to 42°C and has a kink that prevents the mercury from falling back quickly. This allows the user to read the temperature even after removing it from the body.
Q10. A thermometer used in scientific experiments and laboratories is called a:
A laboratory thermometer is used to measure temperature in scientific experiments and in the laboratory. It has a wide range from about -10°C to 110°C and does not have a kink. It is used for measuring the temperature of liquids, air and other substances.
Q11. The liquid commonly used in thermometers is:
Mercury and alcohol are the two most common liquids used in thermometers. Mercury is a metal that remains liquid at room temperature and expands uniformly with heat. Alcohol is used in thermometers for very low temperatures because it does not freeze like mercury.
Q12. The expansion of mercury in a thermometer is used to measure:
Mercury expands when it is heated and contracts when it is cooled. This property of expansion and contraction is used to measure temperature. The level of mercury in the glass tube indicates the temperature of the substance.
Q13. The normal body temperature of a healthy human being is about:
The normal body temperature of a healthy human being is about 37°C (98.6°F). This temperature is measured using a clinical thermometer. Body temperature can vary slightly depending on the time of day and the person’s activity.
Q14. The normal body temperature of a healthy human being is about:
The normal body temperature of a healthy human being is about 98.6°F. This is the equivalent of 37°C. The Fahrenheit scale is used in some countries, particularly in the United States, to measure body temperature.
Q15. A clinical thermometer has a kink near the bulb to:
The kink (or constriction) in a clinical thermometer prevents the mercury from flowing back into the bulb immediately. This allows the user to take the thermometer out of the mouth and read the temperature at their convenience. The mercury stays in place until the thermometer is shaken to reset it.
Q16. The range of a clinical thermometer is from:
A clinical thermometer has a narrow range of 35°C to 42°C. This is because the human body temperature normally lies within this range. This range allows for accurate measurement of body temperature.
Q17. The range of a laboratory thermometer is from:
A laboratory thermometer has a wide range of -10°C to 110°C. This allows it to measure very cold and very hot substances. It is used in experiments to measure the temperature of water, chemicals and other materials.
Q18. The Fahrenheit scale was developed by:
Gabriel Fahrenheit was a German physicist who developed the Fahrenheit temperature scale in 1724. He based his scale on three fixed points: the freezing point of a brine solution, the freezing point of water and the human body temperature. The Fahrenheit scale is still used in some countries.
Q19. Gabriel Fahrenheit developed his temperature scale in the year:
Gabriel Fahrenheit invented the mercury thermometer and developed the Fahrenheit scale in 1714. This was a significant advancement in temperature measurement. His invention of the mercury thermometer was more accurate than previous alcohol thermometers.
Q20. The freezing point of water on the Fahrenheit scale is:
On the Fahrenheit scale, water freezes at 32°F and boils at 212°F under standard atmospheric pressure. This difference of 180 degrees between the freezing and boiling points is used to define the scale. Gabriel Fahrenheit chose these numbers for practical reasons.
Q21. The boiling point of water on the Fahrenheit scale is:
On the Fahrenheit scale, water boils at 212°F under standard atmospheric pressure. This is much higher than the boiling point on the Celsius scale (100°C). The difference between the freezing and boiling points on the Fahrenheit scale is 180 degrees.
Q22. The freezing point of water on the Celsius scale is:
On the Celsius scale, water freezes at 0°C under standard atmospheric pressure. This makes it easy to remember that 0°C is the freezing point of water. The Celsius scale is based on the properties of water.
Q23. The boiling point of water on the Celsius scale is:
On the Celsius scale, water boils at 100°C under standard atmospheric pressure. This is exactly 100 degrees above the freezing point. The Celsius scale is also called the centigrade scale because of this 100-degree interval.
Q24. The air temperature is measured using a:
Weather thermometers are used to measure the temperature of the air. They are placed outdoors in a shaded area to give an accurate reading. These thermometers can be liquid-in-glass or digital.
Q25. The temperature of the human body is measured using a:
A clinical thermometer is used to measure the temperature of the human body. It is placed under the tongue, in the armpit or in the rectum for a few minutes. Digital clinical thermometers are also commonly used today.
Q26. When the temperature of a substance increases, the mercury in a thermometer:
When a substance is heated, its temperature increases, and the particles gain energy and move more. This causes the mercury to expand and rise in the thermometer tube. The expansion of mercury is directly proportional to the increase in temperature.
Q27. When the temperature of a substance decreases, the mercury in a thermometer:
When a substance is cooled, its temperature decreases, and the particles lose energy and move less. This causes the mercury to contract and fall in the thermometer tube. The contraction of mercury is directly proportional to the decrease in temperature.
Q28. A clinical thermometer should be shaken before use to:
A clinical thermometer has a kink that holds the mercury in place after reading. Before using it, you must shake the thermometer vigorously to bring the mercury level back down. This ensures that the reading starts from the bulb.
Q29. The temperature of boiling water is:
The temperature of boiling water at normal atmospheric pressure is 100°C. This is the boiling point of water on the Celsius scale. Boiling occurs when the vapour pressure of the water equals the atmospheric pressure.
Q30. The temperature of ice is:
The temperature of ice at its melting point is 0°C under normal conditions. This is the temperature at which ice and water can coexist in equilibrium. Ice can be colder than 0°C if it is in a freezer.
Q31. A laboratory thermometer does not have a kink because:
A laboratory thermometer does not have a kink because it is used for continuous readings while the thermometer is still in the liquid. It does not need to hold the mercury in place. The kink is only useful for a clinical thermometer where the reading is taken after removal.
Q32. The temperature of a person with fever is usually:
A person with a fever has a body temperature above the normal 37°C. A fever is a sign that the body is fighting an infection. Temperatures above 38°C are considered a fever in adults.
Q33. The temperature of a person with hypothermia is usually:
Hypothermia is a condition where the body temperature drops below 35°C. This can occur due to exposure to cold weather or cold water. It is a medical emergency and requires immediate attention.
Q34. The normal temperature of a healthy person in Fahrenheit is:
The normal body temperature of a healthy person is 98.6°F on the Fahrenheit scale. This is equivalent to 37°C on the Celsius scale. This temperature can vary slightly from person to person.
Q35. The normal temperature of a healthy person in Celsius is:
The normal body temperature of a healthy person is 37°C on the Celsius scale. This is equivalent to 98.6°F on the Fahrenheit scale. Body temperature can be measured using a clinical thermometer.
Q36. The temperature scale used in most countries around the world is the:
The Celsius scale is the most widely used temperature scale around the world. It is the standard scale in many countries for weather, cooking and scientific measurements. It is also the scale used in the International System of Units (SI) for everyday applications.
Q37. The temperature scale used in the United States is primarily the:
The United States primarily uses the Fahrenheit scale for weather, cooking and many other applications. This is a legacy of the early use of the Fahrenheit scale in the country. Other countries that use the Fahrenheit scale include the Bahamas and Belize.
Q38. A thermometer works on the principle that:
Thermometers work on the principle that substances expand when heated and contract when cooled. Most thermometers use liquids like mercury or alcohol. The expansion and contraction of these liquids indicate the temperature.
Q39. Mercury is used in thermometers because it:
Mercury is used in thermometers for many reasons. It remains liquid at room temperature, expands uniformly when heated, and does not stick to the glass tube. This allows for accurate and precise temperature measurements.
Q40. Alcohol is used in thermometers for:
Alcohol is used in thermometers for measuring very low temperatures because it does not freeze like mercury. Mercury freezes at -39°C, while alcohol can measure temperatures as low as -115°C. This makes alcohol thermometers suitable for cold weather and laboratory use.
Q41. A hot object has:
A hot object has more heat energy than a cold object. This is because the particles in a hot object are moving faster and have more kinetic energy. Temperature is a measure of this average kinetic energy.
Q42. A cold object has:
A cold object has less heat energy than a hot object. This is because its particles are moving more slowly and have less kinetic energy. Temperature is a measure of this average kinetic energy.
Q43. The temperature of boiling water in Fahrenheit is:
The temperature of boiling water at normal atmospheric pressure is 212°F on the Fahrenheit scale. This is the temperature at which water changes from liquid to gas. It is equivalent to 100°C on the Celsius scale.
Q44. The temperature of melting ice in Fahrenheit is:
The temperature of melting ice at normal atmospheric pressure is 32°F on the Fahrenheit scale. This is the temperature at which ice changes from solid to liquid. It is equivalent to 0°C on the Celsius scale.
Q45. The temperature of boiling water in Celsius is:
The temperature of boiling water at normal atmospheric pressure is 100°C on the Celsius scale. This is the temperature at which water changes from liquid to gas. It is equivalent to 212°F on the Fahrenheit scale.
Q46. The temperature of melting ice in Celsius is:
The temperature of melting ice at normal atmospheric pressure is 0°C on the Celsius scale. This is the temperature at which ice changes from solid to liquid. It is equivalent to 32°F on the Fahrenheit scale.
Q47. A digital thermometer works using:
A digital thermometer uses electronic sensors to measure temperature. These sensors convert the temperature into an electrical signal that is displayed on a screen. Digital thermometers are commonly used in medicine and are easy to read.
Q48. An infrared thermometer measures temperature:
An infrared thermometer measures temperature without contact by detecting the infrared radiation emitted by an object. This is useful for measuring the temperature of objects that are dangerous or hard to reach. They are commonly used in the food and medical industries.
Q49. The temperature on the Kelvin scale is measured in:
The temperature on the Kelvin scale is measured in Kelvins (K), not degrees. The Kelvin scale is the SI base unit of temperature. It starts at absolute zero (0 K), which is the point where all molecular motion stops.
Q50. Absolute zero is the temperature at which:
Absolute zero is the lowest possible temperature (0 K), at which all molecular motion theoretically stops. At this temperature, particles have the minimum possible energy. Absolute zero is a theoretical concept and has never been reached in practice.
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Q51. The Celsius scale was invented by:
Anders Celsius was a Swedish astronomer who invented the Celsius temperature scale in 1742. He originally defined the scale with 0°C as the boiling point and 100°C as the freezing point, but this was later reversed. Today, 0°C is the freezing point and 100°C is the boiling point.
Q52. The Kelvin scale was invented by:
The Kelvin scale was invented by Lord Kelvin (William Thomson), a British physicist, in 1848. He proposed an absolute temperature scale where 0 K is absolute zero. The Kelvin scale is the SI base unit of temperature.
Q53. The normal temperature of a healthy person in Kelvin is:
The normal body temperature of a healthy person (37°C) is equivalent to 310 K. This is because 0°C is equal to 273.15 K. The Kelvin scale is often used in scientific calculations.
Q54. The temperature at which water freezes on the Kelvin scale is:
The freezing point of water (0°C) is equal to 273.15 K on the Kelvin scale. This is a fundamental reference point in thermodynamics. The Kelvin scale does not use degrees and is written as K.
Q55. The temperature at which water boils on the Kelvin scale is:
The boiling point of water (100°C) is equal to 373.15 K on the Kelvin scale. This is another important reference point in thermodynamics. The Kelvin scale is used in most scientific applications.
Q56. The conversion from Celsius to Fahrenheit is given by:
To convert a temperature from Celsius to Fahrenheit, you multiply the Celsius temperature by 9/5 and then add 32. This is because the Fahrenheit scale has a different zero point and a different degree size compared to the Celsius scale. This formula is widely used for temperature conversion.
Q57. The conversion from Fahrenheit to Celsius is given by:
To convert a temperature from Fahrenheit to Celsius, you subtract 32 from the Fahrenheit temperature and then multiply by 5/9. This formula reverses the Celsius to Fahrenheit conversion. It is commonly used in weather and science.
Q58. The conversion from Celsius to Kelvin is given by:
To convert a temperature from Celsius to Kelvin, you add 273 to the Celsius temperature. This is because 0°C is equal to 273.15 K. This conversion is widely used in scientific experiments and calculations.
Q59. The conversion from Kelvin to Celsius is given by:
To convert a temperature from Kelvin to Celsius, you subtract 273 from the Kelvin temperature. This is because 0 K is absolute zero, which is equal to -273.15°C. This conversion is often used in scientific contexts.
Q60. The highest temperature ever recorded on Earth is about:
The highest temperature ever recorded on Earth was 56.7°C (134°F) in Death Valley, California, in 1913. This is the highest ambient air temperature measured. Extreme temperatures like this are rare and usually occur in desert regions.