Calorimetry is the branch of physics that deals with the measurement of heat exchanged between bodies during a physical or chemical process.
The principle of calorimetry states that:
Heat lost by the hot body = Heat gained by the cold body
This principle is based on the law of conservation of energy.
A calorimeter is an instrument used to measure the quantity of heat gained or lost by a substance.
Heat gained or lost by a body is given by:
Q = m c ΔT
When two substances at different temperatures are mixed, the final temperature is obtained by applying:
Heat lost = Heat gained
Q1. Calorimetry deals with measurement of: A) Temperature B) Heat C) Pressure D) Volume Answer: B Q2. Principle of calorimetry is based on: A) Newton’s law B) Law of gravitation C) Law of conservation of energy D) Hooke’s law Answer: C Q3. According to calorimetry principle: A) Heat gained = Heat lost B) Heat lost = Heat gained C) Heat gained > Heat lost D) Heat lost > Heat gained Answer: B Q4. Instrument used in calorimetry is: A) Thermometer B) Barometer C) Calorimeter D) Hygrometer Answer: C Q5. Formula used in calorimetry is: A) Q = m g h B) Q = (1/2) m v² C) Q = m c ΔT D) Q = F × s Answer: C Q6. When hot and cold water are mixed, the final temperature is obtained by: A) Averaging temperatures B) Ignoring mass C) Heat lost = Heat gained D) Ignoring specific heat Answer: C Q7. In calorimetry problems, usually assumed that: A) Heat is lost to surroundings B) No heat exchange occurs C) No heat is lost to surroundings D) Temperature remains same Answer: C Q8. Which quantity is conserved in calorimetry? A) Mass B) Volume C) Energy D) Temperature Answer: C
Study of measurement of heat exchange between bodies.
Heat lost by hot body = Heat gained by cold body
Q = m c ΔT
Calorimeter
Numericals are frequently asked on mixing of liquids using principle of calorimetry.
