N.C.E.R.T. Simplified

Ch. 1 Matter In Our Surroundings Ch. 10 Gravitaion Ch. 15 Improvement In Food Resources

            Ch.1 Matter In Our Surroundings Exercises Q1. Convert the following temperatures to the celsius scale.       (a) 293 K               (b)  470 K A1.   (a)  *(t)K = (t) ° c   + 273            ⇒  293 =  (t) ° c +273           ⇒    (t) ° c = 293 - 273           ⇒    (t) ° c = 20 ° c                (b)   (t)K = (t) ° c   + 273           ⇒  470 =  (t) ° c + 273            ⇒ (t) ° c = 470 - 273            ⇒ (t) ° c  = 197 ° c *(t) refers to temperature. Q2.  Covert the following temperatures to the Kelvin scale.         (a)  25 ° c                              (b)  373 ° c A2.   (a)   (t)K = (t) ° c   + 273          ⇒ (t)K = 25 + 273          ⇒  (t)K = 298 K                  (b )   (t)K = (t) ° c   + 273         ⇒ (t)K = 373 + 273                       ⇒ (t)K = 646 K Q3. Give reason for the following observations.         (a)  Naphthalene balls disappear with time without leaving any solid.         (b) We can get the smell of perfume si