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Matter in Our Surroundings CBSE Class 9

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Matter in Our Surroundings Topics

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Question 1/20

Q 1. Inter-conversion of matter is brought about by changing 

Solution

Inter-conversion of matter is brought about by changing temperature and pressure. 

Q 2. Inter-conversion of matter is brought about by changing 

Solution

Inter-conversion of matter is brought about by changing temperature and pressure. 

Q 3. 290 K = ___C 

Solution

1C = 273 K. Therefore, 290 K = 17C. 

Q 4. A puddle formed by rainwater dries up in the Sun by 

Solution

A puddle formed by rainwater dries up inbright sunshine by evaporation. 

Q 5. Sugar dissolved in water can be separated by the method of 

Solution

Sugar dissolved in water is separated by the method of evaporation. 

Q 6. For any substance, the temperature remains the same during the phase change because of 

Solution

For any substance, temperature remains the same during the phase change because of latent heat. 

Q 7. For any substance, the temperature remains the same during the phase change because of 

Solution

For any substance, temperature remains the same during the phase change because of latent heat. 

Q 8. Latent heat is related to 

Solution

Latent heat is related to fusion or vaporisation. 

Q 9. LPG used at home is in the 

Solution

LPG used at home is in the compressed form. 

Q 10. Latent heat is related to 

Solution

Latent heat is related to fusion or vaporisation. 

Q 11. The phase change during the fusion process is 

Solution

Fusion is the process in which solid changes to liquid. 

Q 12. Which of the following has the highest kinetic energy? 

Solution

Particles of steam at 100°Care in the gaseous state. Gases have the highest kinetic energy. 

Q 13. At the melting point, the temperature remains constant on heating because 

Solution

At the melting point, the temperature remains constant on heating becauseheatis used to break the force of attraction. 

Q 14. The colour of vapour formed on sublimation of iodine is 

Solution

The colour of vapour formed on sublimation of iodine is violet. 

Q 15. The colour of vapour formed on sublimation of iodine is 

Solution

The colour of vapour formed on sublimation of iodine is violet. 

Q 16. The phase change during the fusion process is 

Solution

Fusion is the process in which solid changes to liquid. 

Q 17. At the melting point, the temperature remains constant on heating because 

Solution

At the melting point, the temperature remains constant on heating becauseheatis used to break the force of attraction. 

Q 18. Which of the following has the highest kinetic energy? 

Solution

Particles of steam at 100°Care in the gaseous state. Gases have the highest kinetic energy. 

Q 19. Which of the following substances can sublime? 

Solution

Camphor, ammonium chloride and solid CO2 all can sublime. 

Q 20. Which of the following have the least intermolecular spaces between molecules? 

Solution

Solids have the least intermolecular spaces between molecules. 

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