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Matter in Our Surroundings Exercises Solutions
- Q1(a): Convert the following temperatures to the celsius scale. (a) 293 K
- Q1(b): Convert the following temperatures to the celsius scale. (b) 470 K
- Q2(a): Convert the following temperatures to the kelvin scale. (a) $25^{\circ}$C
- Q2(b): Convert the following temperatures to the kelvin scale. (b) $373^{\circ}$C
- Q3(a): Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid.
- Q3(b): Give reason for the following observations. (b) We can get the smell of perfume sitting several metres away.
- Q4: Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.
- Q5(a): What is the physical state of water at— (a) $25^{\circ}$C ?
- Q5(b): What is the physical state of water at— (b) $0^{\circ}$C ?
- Q5(c): What is the physical state of water at— (c) $100^{\circ}$C ?
- Q6(a): Give two reasons to justify— (a) water at room temperature is a liquid.
- Q6(b): Give two reasons to justify— (b) an iron almirah is a solid at room temperature.
- Q7: Why is ice at 273 K more effective in cooling than water at the same temperature?
- Q7(c): Which of the following materials fall in the category of a “pure substance”? (c) Iron
- Q8: What produces more severe burns, boiling water or steam?
- Q9: Name A,B,C,D,E and F in the following diagram showing change in its state
Chapters in CBSE - Class 9 Science
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