Question

1. (i) Edge of a metal cube is 3 cm. Find the total
surface area of the cube.
(ii) A rectangular box is filled with 30 such cubes.
Calculate the internal volume of the box.
(iii) If the weight of the box is 1.5 kg and the total
weight of the box with the thirty cubes is
2.4 kg, calculate the weight of each cube
giving your answer in grams.
2. (1) A solid metal bar is in the shape of a cuboid
of length 250 cm and volume 4840 cm. The
cross-section is a square of side x cm. Find .
(ii) A box, cuboid in shape, measures 250 cm by
88 cm by h cm. 120 such metal bars fit exactly
in the box. Find h.
3. How many square glazed tiles of side 8 cm
will be required to cover the walls of a room
4 m by 3 m by 2 m? If 25 tiles cost 40, find the
cost of tiling the walls of the room.
4. The length of a room is double its breadth
and height is 3 m. If the area of four walls is
108 m2, find the volume of the room.
5. A 4 cm edge cube is cut into 1 cm edge cubes.
Calculate the total surface area of all the small
cubes.


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Answer 1

Answer:

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