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CBSE - Class 9 Science Matter in Our Surroundings Worksheet

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

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

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

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

What produces more severe burns, boiling water or steam?

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

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

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

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

10.

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

11.

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

12.

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

13.

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

14.

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

15.

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

16.

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

Worksheet Answers

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