What is Heat vs Temperature ? āϤāĻžāĻĒ āĻŦāύāĻžāĻŽ āĻāώā§āĻŖāϤāĻž
1. Definition / āϏāĻāĻā§āĻāĻž
i. Heat (āϤāĻžāĻĒ): Energy transferred from a hotter body to a colder body. (āĻāĻāĻž āĻ āϧāĻŋāĻ āĻā§°āĻŽ āĻŦāϏā§āϤā§ā§° āĻĒā§°āĻž āĻāĻŽ āĻā§°āĻŽ āĻŦāϏā§āϤā§āϞ⧠āϏā§āĻĨāĻžāύāĻžāύā§āϤ⧰ āĻšā§ā§ąāĻž āĻļāĻā§āϤāĻŋāĨ¤)
ii. Temperature (āĻāώā§āĻŖāϤāĻž): Measure of the degree of hotness or coldness of a body. (āĻā§āύ⧠āĻŦāϏā§āϤ⧠āĻāĻŋāĻŽāĻžāύ āĻā§°āĻŽ āĻŦāĻž āĻ āĻžāĻŖā§āĻĄāĻž āϤāĻžā§° āĻĒā§°āĻŋāĻŽāĻžāĻĒāĨ¤)
2. Nature / āĻĒā§ā§°āĻā§āϤāĻŋ
i. Heat: A form of energy. (āĻāĻāĻž āĻļāĻā§āϤāĻŋā§° ā§°ā§āĻĒāĨ¤)
ii. Temperature: A measure of thermal state. (āϤāĻžāĻĒā§āϝāĻŧ āĻ ā§ąāϏā§āĻĨāĻžā§° āĻĒā§°āĻŋāĻŽāĻžāĻĒāĨ¤)
3. Symbol / āĻāĻŋāĻšā§āύ: i. Heat: Q, ii. Temperature: T
4. Unit / āĻāĻāĻ
i. Heat: Joule (J) or calorie (āĻā§āϞ (J) āĻŦāĻž āĻā§āϞ⧰āĻŋ)
ii. Temperature: Degree Celsius (°C), Kelvin (K), or Degree Fahrenheit (°F) {āĻĄāĻŋāĻā§ā§°ā§ āĻā§āϞāĻāĻŋāϝāĻŧāĻžāĻ (°C), āĻā§āϞāĻāĻŋāύ (K), āĻŦāĻž āĻĄāĻŋāĻā§ā§°ā§ āĻĢāĻžā§°ā§āύāĻšāĻžāĻāĻ (°F)}
5. Depends on Amount / āĻĒā§°āĻŋāĻŽāĻžāĻŖā§° āĻāĻĒā§°āϤ āύāĻŋā§°ā§āĻā§°āĻļā§āϞāϤāĻž
i. Heat: Depends on mass and material. (āĻā§° āĻā§°ā§ āĻĒāĻĻāĻžā§°ā§āĻĨā§° āĻāĻĒā§°āϤ āύāĻŋā§°ā§āĻā§° āĻā§°ā§āĨ¤)
ii. Temperature: Does not depend on amount of substance. (āĻĒāĻĻāĻžā§°ā§āĻĨā§° āĻĒā§°āĻŋāĻŽāĻžāĻŖā§° āĻāĻĒā§°āϤ āύāĻŋā§°ā§āĻā§° āύāĻā§°ā§āĨ¤)
6. Measurement / āĻĒā§°āĻŋāĻŽāĻžāĻĒ
i. Heat: Measured by calorimetry. (āĻā§āϞ⧰āĻŋāĻŽā§āĻā§ā§°āĻŋā§° āϏāĻšāĻžāϝāĻŧāϤ āĻā§āĻāĻž āĻšāϝāĻŧāĨ¤)
ii. Temperature: Measured with a thermometer. (āĻĨāĻžā§°ā§āĻŽā§āĻŽāĻŋāĻāĻžā§°ā§° āϏāĻšāĻžāϝāĻŧāϤ āĻā§āĻāĻž āĻšāϝāĻŧāĨ¤)
7. Example / āĻāĻĻāĻžāĻšā§°āĻŖ
i. Heat: Hot tea gives heat to a spoon. (āĻā§°āĻŽ āĻāĻžāĻšā§ āĻāĻžāĻŽā§āĻāϞ⧠āϤāĻžāĻĒ āĻĻāĻŋāϝāĻŧā§āĨ¤)
ii. Temperature: A thermometer shows 70°C. (āĻĨāĻžā§°ā§āĻŽā§āĻŽāĻŋāĻāĻžā§°ā§ 70°C āĻĻā§āĻā§ā§ąāĻžāϝāĻŧāĨ¤)
Main Difference / āĻŽā§āĻā§āϝ āĻĒāĻžā§°ā§āĻĨāĻā§āϝ
- Heat = Transfer of energy (āϤāĻžāĻĒ = āĻļāĻā§āϤāĻŋā§° āϏā§āĻĨāĻžāύāĻžāύā§āϤ⧰)
- Temperature = Degree of hotness or coldness (āĻāώā§āĻŖāϤāĻž = āĻā§°āĻŽ āĻŦāĻž āĻ āĻžāĻŖā§āĻĄāĻžā§° āĻŽāĻžāϤā§ā§°āĻž)
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MCQ on Heat vs Temperature (āϤāĻžāĻĒ āĻā§°ā§ āĻāώā§āĻŖāϤāĻžā§° āĻāĻĒā§°āϤ MCQ)
1. What is heat ? (ā§§. āϤāĻžāĻĒ āĻāĻŋ ?)
(a) A type of matter (b) A form of energy (c) A force (d) A gas
Ans / āĻāϤā§āϤ⧰: (b) A form of energy
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Heat is a form of energy transferred from a hotter body to a colder body. āϤāĻžāĻĒ āĻšā§āĻā§ āĻ āϧāĻŋāĻ āĻā§°āĻŽ āĻŦāϏā§āϤā§ā§° āĻĒā§°āĻž āĻāĻŽ āĻā§°āĻŽ āĻŦāϏā§āϤā§āϞ⧠āϏā§āĻĨāĻžāύāĻžāύā§āϤ⧰ āĻšā§ā§ąāĻž āĻļāĻā§āϤāĻŋāĨ¤
2. Temperature measures the degree of: (⧍. āĻāώā§āĻŖāϤāĻžāĻ āĻāĻŋāĻšā§° āĻŽāĻžāϤā§ā§°āĻž āĻā§āĻā§ ?)
(a) Weight (b) Pressure (c) Hotness or coldness (d) Force
Ans / āĻāϤā§āϤ⧰: (c) Hotness or coldness
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Temperature tells how hot or cold a body is. (āĻāώā§āĻŖāϤāĻžāĻ āĻā§āύ⧠āĻŦāϏā§āϤ⧠āĻāĻŋāĻŽāĻžāύ āĻā§°āĻŽ āĻŦāĻž āĻ āĻžāĻŖā§āĻĄāĻž āϤāĻžāĻ āĻāύāĻžāϝāĻŧāĨ¤)
3. Which symbol is used for heat ? (ā§Š. āϤāĻžāĻĒā§° āĻŦāĻžāĻŦā§ āĻā§āύāĻā§ āĻāĻŋāĻšā§āύ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?)
(a) T (b) H (c) Q (d) K
Ans / āĻāϤā§āϤ⧰: (c) Q
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: The symbol commonly used for heat is Q. (āϤāĻžāĻĒā§° āĻŦāĻžāĻŦā§ āϏāĻžāϧāĻžā§°āĻŖāϤ⧠Q āĻāĻŋāĻšā§āύ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧāĨ¤)
4. Which instrument is used to measure temperature ? (ā§Ē. āĻāώā§āĻŖāϤāĻž āĻā§āĻāĻžā§° āĻŦāĻžāĻŦā§ āĻā§āύāĻā§ āϝāύā§āϤā§ā§° āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧ ?)
(a) Barometer (b) Thermometer (c) Ammeter (d) Lactometer
Ans / āĻāϤā§āϤ⧰: (b) Thermometer
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: A thermometer is used to measure temperature. (āĻĨāĻžā§°ā§āĻŽā§āĻŽāĻŋāĻāĻžā§° āĻāώā§āĻŖāϤāĻž āĻā§āĻāĻžā§° āĻŦāĻžāĻŦā§ āĻŦā§āĻ¯ā§ąāĻšāĻžā§° āĻā§°āĻž āĻšāϝāĻŧāĨ¤)
5. SI unit of heat is: (ā§Ģ. āϤāĻžāĻĒā§° SI āĻāĻāĻ āĻāĻŋ ?)
(a) Degree Celsius (b) Kelvin (c) Joule (d) Watt
Ans / āĻāϤā§āϤ⧰: (c) Joule
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: The SI unit of heat energy is joule (J). (āϤāĻžāĻĒ āĻļāĻā§āϤāĻŋā§° SI āĻāĻāĻ āĻšā§āĻā§ āĻā§āϞ (J)āĨ¤)
6. Which of the following does not depend on the amount of substance ? (ā§Ŧ. āϤāϞ⧰ āĻā§āύāĻā§ āĻĒāĻĻāĻžā§°ā§āĻĨā§° āĻĒā§°āĻŋāĻŽāĻžāĻŖā§° āĻāĻĒā§°āϤ āύāĻŋā§°ā§āĻā§° āύāĻā§°ā§ ?)
(a) Heat (b) Mass (c) Temperature (d) Weight
Ans / āĻāϤā§āϤ⧰: (c) Temperature
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Temperature does not depend on the quantity of substance. (āĻāώā§āĻŖāϤāĻž āĻĒāĻĻāĻžā§°ā§āĻĨā§° āĻĒā§°āĻŋāĻŽāĻžāĻŖā§° āĻāĻĒā§°āϤ āύāĻŋā§°ā§āĻā§° āύāĻā§°ā§āĨ¤)
7. Heat flows from: (ā§. āϤāĻžāĻĒ āĻ’ā§° āĻĒā§°āĻž āĻ’āϞ⧠āϝāĻžāϝāĻŧ ?)
(a) Colder body to hotter body (b) Hotter body to colder body (c) Equal temperature bodies (d) Vacuum to matter
Ans / āĻāϤā§āϤ⧰: (b) Hotter body to colder body
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Heat naturally flows from a hot body to a cold body. (āϤāĻžāĻĒ āϏā§āĻŦāĻžāĻāĻžā§ąāĻŋāĻāĻāĻžā§ąā§ āĻā§°āĻŽ āĻŦāϏā§āϤā§ā§° āĻĒā§°āĻž āĻ āĻžāĻŖā§āĻĄāĻž āĻŦāϏā§āϤā§āϞ⧠āϝāĻžāϝāĻŧāĨ¤)
8. Which of the following is a unit of temperature? (ā§Ž. āϤāϞ⧰ āĻā§āύāĻā§ āĻāώā§āĻŖāϤāĻžā§° āĻāĻāĻ ?)
(a) Joule (b) Calorie (c) Kelvin (d) Newton
Ans / āĻāϤā§āϤ⧰: (c) Kelvin
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Kelvin is a unit used to measure temperature. (āĻā§āϞāĻāĻŋāύ āĻāώā§āĻŖāϤāĻž āĻā§āĻāĻžā§° āĻāĻāĻāĨ¤)
9. Hot tea giving heat to a spoon is an example of: ⧝. āĻā§°āĻŽ āĻāĻžāĻšā§ āĻāĻžāĻŽā§āĻāϞ⧠āϤāĻžāĻĒ āĻĻāĻŋāϝāĻŧāĻž āĻāĻŋ āĻāĻĻāĻžāĻšā§°āĻŖ ?
(a) Temperature (b) Heat transfer (c) Force (d) Reflection
Ans / āĻāϤā§āϤ⧰: (b) Heat transfer
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Heat transfers from the hot tea to the cooler spoon. (āĻā§°āĻŽ āĻāĻžāĻšā§° āĻĒā§°āĻž āĻ āĻžāĻŖā§āĻĄāĻž āĻāĻžāĻŽā§āĻāϞ⧠āϤāĻžāĻĒ āϏā§āĻĨāĻžāύāĻžāύā§āϤ⧰ āĻšāϝāĻŧāĨ¤)
10. Which one is NOT a unit of temperature ?(ā§§ā§Ļ. āϤāϞ⧰ āĻā§āύāĻā§ āĻāώā§āĻŖāϤāĻžā§° āĻāĻāĻ āύāĻšāϝāĻŧ ?)
(a) Celsius (b) Fahrenheit (c) Kelvin (d) Joule
Ans / āĻāϤā§āϤ⧰: (d) Joule
Explanation / āĻŦā§āϝāĻžāĻā§āϝāĻž: Joule is a unit of heat energy, not temperature. (āĻā§āϞ āĻšā§āĻā§ āϤāĻžāĻĒ āĻļāĻā§āϤāĻŋā§° āĻāĻāĻ, āĻāώā§āĻŖāϤāĻžā§° āύāĻšāϝāĻŧāĨ¤)