Class 9 Exam  >  Class 9 Notes  >  Lab Manuals for Class 9  >  Viva Voce: Melting Point of Ice & Boiling Point of Water

Viva Voce: Melting Point of Ice & Boiling Point of Water | Lab Manuals for Class 9 PDF Download

Q.1. State the temperature at which water and ice co-exist.

Water and ice co-exist at 0°C/ 273 K.


Q.2. When ice and cold water both are at 0°C then why does ice floats on water?

Density of ice is less than water.


Q.3. What is the principle of working of a pressure cooker?

In pressure cooker the pressure is increased. The water boils at temperature more than 100°C.


Q.4. What is the latent heat of fusion of ice?

336 kJ/kg.


Q.5. At what temperature is the density of water maximum?

At 4°C.


Q.6. What is the melting point of pure water ice cubes?

0°C.


Q.7. In cold countries why do people sprinkle common salt over it?

The ice melts faster when salt is sprinkled over it and the clearance of ice from the path becomes easier and faster impurities decreases the melting point.


Q.8. Which of the two contains more heat energy, water at 100°C or steam at 100°C?

Steam at 100°C, contains more heat energy.


Q.9. At what temperature will you get the latent heat of fusion for water?

At 0°C.


Q.10. What is the boiling point of pure water?

100°C

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