Evaporation and Cooling Effect MCQs
Practice Evaporation and Cooling Effect multiple-choice questions from Matter in Our Surroundings (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Evaporation and Cooling EffectQuiz - Solve & Score
Q1. A potter sprinkles 4 g of water onto a freshly fired earthen jar and it turns entirely to vapour; if the latent heat of vaporisation of water is 2260 J/g, how much heat does the vapour carry off the jar?
- A.565 J
- B.2264 J
- C.9040 J
- D.9.04 J
Answer: C. 9040 J
Heat absorbed Q = m*L = 4 g * 2260 J/g = 9040 J, drawn from the surroundings as the water evaporates.
Q2. In a chemistry class 8 g of distilled water evaporates completely from an open watch-glass over an afternoon; given a latent heat of vaporisation of 2260 J/g, what heat is absorbed from the room?
- A.18.08 J
- B.2268 J
- C.18080 J
- D.282.5 J
Answer: C. 18080 J
Heat absorbed Q = m*L = 8 g * 2260 J/g = 18080 J, drawn from the surroundings as the water evaporates.
Q3. A trekker hangs a damp scarf in a tent overnight and 12 g of its water evaporates by morning; if vaporising water requires 2260 J/g, how much heat does this remove from the tent air?
- A.27120 J
- B.2272 J
- C.188.3333 J
- D.27.12 J
Answer: A. 27120 J
Heat absorbed Q = m*L = 12 g * 2260 J/g = 27120 J, drawn from the surroundings as the water evaporates.
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