Matter IN Our Surroundings | Chapter-1 | Class 9 General Science NCERT School Question Answer | Matter IN Our Surroundings Lesson 1 Class 9 General Science NCERT School Question Answer and Solutions For Assam |

 Chapter 1

Matter IN Our Surroundings

Exercises

1.  Convert the following temperatures to the celsius scale.

(a) 293 k          (b) 470 k.

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(2)  Convert the following temperatures to the kelvin scale.

 (a) 25॰C       (b) 373॰C  

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(3) Give reason for the following observations.

        (a) Naphthalene balls disappear with time without leaving any solid. (b)  We can get the smell of perfume sitting several metrees away. 

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(4)  Arrange the following substances in  increasing order of forces of attraction between the particles- water, sugar, oxygen.

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(5) what is the physical state of water at-

      (a) 25॰C          (b) 0॰C     (c) 100॰C ?

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(6) Give two reasons to justify-

(a) water at room temperature is a liquid.

(b) an iron almirah is a solid at room temperature.

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(7) why is ice at 273 k more effective in cooling than water at the same temperature ?

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(8) what produces more severe burns, boiling water or steam ?

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

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type: kalpana hazarika

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