Evaporation and Cooling EffectPractice Questions & MCQs
Practice Evaporation and Cooling Effect questions from Matter in Our Surroundings (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then 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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Where can I practise Evaporation and Cooling Effect questions for Class 9 Science?
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Are these Evaporation and Cooling Effect questions important for the exam?
Yes. These Evaporation and Cooling Effect important questions follow the Science exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
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