NCERT SOLUTION CLASS 9 SCIENCE PAGE-9

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NCERT SOLUTION OF CHAPTER 1 OF CBSE BOARD CLASS 9 ( MATTER IN OUR SURROUNDINGS)

PAGE 9

QUESTION NO 1

     Convert the following temperature to celsius scale ;
    (a) 300 K    (b) 573 K

ANSWER: 

    (A) 300K  =   (300-273) = 27 Degree centigrade.
    (B) 573 K =  (573-273)  =  300 Degree centigrade.

QUESTION NO 2

   What is the physical state of water at ;
(A) 250 Degree centigrade  (B) 100 Degree Centigrade 

ANSWER NO 2 

(A)  Water at 250 degree centigrade exists in gaseous state.
(B)  At 100 degree centigrade water can exists in both liquid and gaseous form. At this temperature,after getting the heat equal to the latent heat of vaporization,water starts changing from liquid state to gaseous state.  

QUESTION NO 3

   For any substance,why does the temperature remain constant during the change of state?

ANSWER NO 3

  During the change of state,the temperature remains constant. This is due to all the heat supplied to increase the to increase the temperature is utilised (as latent heat) in changing the state by overcoming the force of attraction between the particles. Therefore, this heat does not contribute in increasing the temperature of the substance.

QUESTION NO 4

  Suggest a method to liquefy atmospheric gases.

ANSWER 

  Atmospheric gases can be liquefied by applying pressure and reducing temperature.

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