Change of State (Melting, Boiling, Sublimation)Practice Questions & MCQs
Practice Change of State (Melting, Boiling, Sublimation) 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.
Change of State (Melting, Boiling, Sublimation)Quiz - Solve & Score
Q1. An ice carver must just melt a 15 g chip of ice that is already sitting at 0 degrees C into water at the same temperature; what heat input does this need?
- A.33900 J
- B.63 J
- C.5010 J
- D.334 J
Answer: C. 5010 J
Melting at a constant 0 degrees C: Q = m x Lf = 15 x 334 = 5010 J.
Q2. A glass of cola contains 12 g of ice cubes at 0 degrees C that gradually become water at 0 degrees C; what amount of heat do the cubes draw from the drink?
- A.334 J
- B.4008 J
- C.50.4 J
- D.27120 J
Answer: B. 4008 J
Melting at a constant 0 degrees C: Q = m x Lf = 12 x 334 = 4008 J.
Q3. A laboratory demonstration converts 50 g of finely crushed ice at 0 degrees C entirely to water at 0 degrees C; how much energy must be supplied?
- A.16700 J
- B.334 J
- C.113000 J
- D.210 J
Answer: A. 16700 J
Melting at a constant 0 degrees C: Q = m x Lf = 50 x 334 = 16700 J.
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Where can I practise Change of State (Melting, Boiling, Sublimation) questions for Class 9 Science?
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Are these Change of State (Melting, Boiling, Sublimation) questions important for the exam?
Yes. These Change of State (Melting, Boiling, Sublimation) 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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