Q5.)(a)Give two examples of objects which shine.
(b.) Give two examples of objects which are made
of wood.
(c.) Give two examples of objects which float on
water.
Q 6.)What is sieving? Where is it used ?
Q7.) Give three examples to explain the difference
between changes which can or cannot be reversed
Q 8.) Why do we need to separate different
components of a mixture? Give two examples also.
Answers
Q5.) (a) GLASS BOWL, STEEL SPOON (b) CRICKET BAT, TABLE . (c) PAPER, ICE
6) Sieving is a simple technique for separating particles of different sizes. A sieve such as used for sifting flour has very small holes. Sieves are also used to separate stones from sand.
Q7) Melting of ice is a reversible change. ... When ice cubes are kept at room temperature, they turn into water after some time. On the other hand, burning of a piece of paper is an irreversible change.
Q8) Among different components of mixture there are many substances which are harmful or not useful for us. To remove these harmful or unuseful components we need to separate them. For example: (a) Tea leaves are separated from the liquid with a strainer while preparing tea.
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