7th Class Science Sample Paper Science Sample Paper - 10

  • question_answer
    Compare the burning characteristics of cotton, nylon, silk and wool.

    Answer:

    Fibre Smell Burning Characteristics Residue
    Cotton Burning paper Burns with light smoke Fine ash which crumbles on touching.
    Nylon Burning plastic Melts and shrinks Dry hard bead.
    Silk Burning hair Burns slowly Silvery beads which easily crush to powder.
    Wool Burning hair Burns slowly; stops burning when removed from the flame. Brown shiny hollow beads which crumble on pressing.


You need to login to perform this action.
You will be redirected in 3 sec spinner