You need to have containers for collection of (i) food waste,
(ii) broken glass and (iii) wastepaper. Which materials will
you choose for containers of these types of waste? What
properties of materials do you need to think of?
We see chairs made up of various materials, such as wood,
iron, plastic, bamboo, cement and stones. Following are
some desirable properties of materials which can be used
to make chairs. Which materials used to make chairs fulfil
these properties the most?
(i) Hardness (does not bend or shake on sitting even after
long use).
(ii) Lightweight (easy to lift or to take from one place to
another).
(iii) Does not feel very cold when sitting during winters.
(iv) Can be cleaned regularly and made to look new even
after long use.
State whether the statements given below are True [T] or
False [F]. Correct the False statement(s).
(i) Wood is translucent while glass is opaque. [ ]
(ii) Aluminium foil has lustre while an eraser
does not. [ ]
(iii) Sugar dissolves in water whereas sawdust
does not. [ ]
(iv) An apple is a matter because it occupies no
space and has mass. [ ]
The containers which are used to store materials in shops and
at home are usually transparent. Give your reasons for this.
Visit your kitchen and observe how your parents have
organised various edibles. Can you suggest a better sorting
method? Write it in your notebook.
A shirt with marked price Rs 800 was sold at Rs 680.
The rate of discount allowed on the shirt is
(a) 10% (b) 15% (c) 20% (d) 25%
The diameter of the Sun is 1.4 × 109 m and the diameter of the Earth
is 1.2756 × 107 m. Compare their diameters by division.
Find three repeater machines that will do the same work as a (×64)
machine. Draw them, or describe them using exponents
There are 864,00 seconds in a day. How many days long is a second?
Express your answer in scientific notation.
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