State whether the statements given below are ‘true’ or ‘false’.
(i) Stone is transparent, while glass is opaque.
(ii) A notebook has lustre while eraser does not
(iii) Chalk dissolves in water.
(iv) A piece of wood floats on water.
(v) Sugar does not dissolve in water.
(vi) Oil mixes with water.
(vii) Sand settles down in water.
(viii) Vinegar dissolves in water.

(i) False
Stone is opaque because light does not pass through stone but glass is transparent as light can easily pass through the glass.
Note: Opaque substances are those substances through which objects cannot be seen, e.g., wood, stone.
Translucent substances are those substances through which objects can be seen but not clearly, e.g., oiled paper, frosted glass.
Transparent substances are those substances through which objects can be seen clearly e.g., glass, clear water.

(ii) False
No, notebooks and erasers don't have luster as they are not shiny objects.

(iii) False
No chalk does not dissolve in water because chalk is not a soluble substance.

(iv) True.
Wood being lighter than water, floats on water.

(v) False
Sugar dissolves in water because it is a soluble substance.

(vi) False
No, oil does not mix with water as oil is insoluble in water.

(vii) True.
Sand is insoluble in water, hence, on mixing sand and water, it settles down in the water when left undisturbed.

(viii) True.
Vinegar is soluble in water, hence, it dissolves in water.

Updated on: 10-Oct-2022

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