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CBSE - Class 9 Science Matter in Our Surroundings Worksheet

1.
Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.
2.
What is the physical state of water at— (a) $25^{\circ}$C ?
3.
What produces more severe burns, boiling water or steam?
4.

Name A,B,C,D,E and F in the following diagram showing change in its state

5.
Convert the following temperatures to the celsius scale. (b) 470 K
6.
What is the physical state of water at— (b) $0^{\circ}$C ?
7.
Convert the following temperatures to the kelvin scale. (a) $25^{\circ}$C
8.
Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid.
9.
Which of the following materials fall in the category of a “pure substance”? (c) Iron
10.
Convert the following temperatures to the kelvin scale. (b) $373^{\circ}$C
11.
Convert the following temperatures to the celsius scale. (a) 293 K
12.
Why is ice at 273 K more effective in cooling than water at the same temperature?
13.
Give two reasons to justify— (b) an iron almirah is a solid at room temperature.
14.
What is the physical state of water at— (c) $100^{\circ}$C ?
15.
Give reason for the following observations. (b) We can get the smell of perfume sitting several metres away.
16.
Give two reasons to justify— (a) water at room temperature is a liquid.

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