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CBSE - Class 9 Science Matter in Our Surroundings Worksheet

Give two reasons to justify— (a) water at room temperature is a liquid.

Give two reasons to justify— (b) an iron almirah is a solid at room temperature.

Why is ice at 273 K more effective in cooling than water at the same temperature?

What is the physical state of water at— (a) $25^{\circ}$C ?

Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, oxygen.

Give reason for the following observations. (b) We can get the smell of perfume sitting several metres away.

What is the physical state of water at— (c) $100^{\circ}$C ?

Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid.

What produces more severe burns, boiling water or steam?

10.

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

11.

What is the physical state of water at— (b) $0^{\circ}$C ?

12.

Convert the following temperatures to the celsius scale. (a) 293 K

13.

Convert the following temperatures to the celsius scale. (b) 470 K

14.

Convert the following temperatures to the kelvin scale. (a) $25^{\circ}$C

15.

Which of the following materials fall in the category of a “pure substance”? (c) Iron

16.

Convert the following temperatures to the kelvin scale. (b) $373^{\circ}$C

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