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Answer :

A: Melting / Fusion

B: Evaporation / Vapourisation

C: Condensation

D: Solidification

E: Sublimation

F: Sublimation

- Convert the following temperature to Celsius scale. (a) 293K (b) 470K
- Convert the following temperatures to the Kelvin scale. (a) \( 25°C \) (b) \( 373°C \)
- Give reason for the following observations: (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume while sitting several metres away.
- Arrange the following in increasing order of forces of attraction between the particles – water, sugar, oxygen.
- What is the physical state of water at – (a) 25°C (b) 0°C (c) 100°C?
- Give two reasons to justify – (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature.
- Why is ice at 273K more effective in cooling than water at the same temperature?
- What produces more severe burns, boiling water or steam?

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- NCERT solutions for class 9 maths chapter 10 Circles
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- NCERT solutions for class 9 science chapter 3 Atoms and Molecules
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- NCERT solutions for class 9 science chapter 5 The Fundamental Unit of Life
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- NCERT solutions for class 9 science chapter 10 Gravitation
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