State whether the statements given below are True [T] or False [F]. Correct the False statement(s).
Wood is translucent while glass is opaque.
False. Wood is opaque while glass is transparent.
Aluminium foil has lustre while an eraser does not.
True. Aluminium is a metal and has a shiny (lustrous) surface, while an eraser is made of rubber which is non-lustrous.
Sugar dissolves in water whereas sawdust does not.
True. Sugar is soluble in water and dissolves completely, while sawdust is insoluble and does not dissolve in water.
An apple is a matter because it occupies no space and has mass.
False. An apple is matter because it occupies space AND has mass.
Explanation
(i) The chapter states on Page 9 that wood is an opaque material through which nothing can be seen, while glass is a transparent material through which things can be seen clearly. (ii) The chapter explains on Page 7 that metals like aluminium have lustrous (shiny) surfaces, while non-lustrous materials like rubber do not have shiny surfaces. (iii) The chapter explains on Page 11 that soluble materials like sugar and salt disappear when mixed in water, while insoluble materials like sawdust do not mix with water and do not disappear even after stirring. (iv) The chapter defines matter on Page 15 as anything that occupies space AND has mass. An apple has both properties - it takes up space and has mass, making it matter.