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Sushil Kumar from dpsnoida, Noida
Subject :NSO    Class : Class 6

Observe the given Venn diagram carefully and fill in the blanks by choosing an appropriate option.

1 2 3 4
A Falling of
trees		 Occurrence of
rainbow		 Growth of
plants		 Tearing paper
into pieces
B Knitting sweater
from wool		 Setting of milk
to form curd		 Making rice
puddings		 Dissolving sugar
in water
C Expansion of mercury
in thermometer		 Breaking of
glass		 Lighting LPG
stove 		Boiling an
egg
D Filling a water
bottle		 Melting of
ice		 Burning of
paper		 Boiling of
water


Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1
Answer: C 1 : Expansion of mercury in thermometer is a physical change which is reversible as mercury returns to its original position (contracts) on cooling. 2 : Breaking of glass is a physical change which is irreversible as broken pieces of glass cannot be joined back. 3 : Lighting LPG stove involves both physical and chemical changes. When LPG comes out of the cylinder it changes from liquid to gaseous state which is a physical change. Then the gas burns in the air which is a chemical change. 4. Boiling of an egg is a chemical change, liquid egg converts to solid egg having different texture and taste which is irreversible as boiled egg cannot be changed into original liquid form.

Ans 2:

from Gitanjali Public School ,
Class : Class 8
c

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