Q : 8 Parveen wanted to make a temporary shelter for her car, by making a box-like structure with tarpaulin that covers all the four sides and the top of the car (with the front face as a flap which can be rolled up). Assuming that the stitching margins are very small, and therefore negligible, how much tarpaulin would be required to make the shelter of height , with base dimensions ?
Q : 7 Shanti Sweets Stall was placing an order for making cardboard boxes for packing their sweets. Two sizes of boxes were required. The bigger of dimensions , and the smaller of dimensions . For all the overlaps, of the total surface area is required extra. If the cost of the cardboard is Rs 4 for , find the cost of cardboard required for supplying 250 boxes of each kind.
Q : 6 A small indoor greenhouse (herbarium) is made entirely of glass panes (including base) held together with tape. It is 30 cm long, 25 cm wide and 25 cm high.
(ii) How much of tape is needed for all the 12 edges?
Q : 6 A small indoor greenhouse (herbarium) is made entirely of glass panes (including
base) held together with tape. It is long, wide and high.
(i) What is the area of the glass?
Q : 5 A cubical box has each edge and another cuboidal box is long, wide and high.
(ii) Which box has the smaller total surface area and by how much?
Q : 5 A cubical box has each edge and another cuboidal box is long, wide and high.
(i) Which box has the greater lateral surface area and by how much?
Q : 4 The paint in a certain container is sufficient to paint an area equal to . How many bricks of dimensions can be painted out of this container?
Q : 3 The floor of a rectangular hall has a perimeter . If the cost of painting the four walls at the rate of Rs 10 per is Rs 15000, find the height of the hall.
[Hint : Area of the four walls Lateral surface area.]
Q : 2 The length, breadth and height of a room are , and respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of per .
Q : 1 A plastic box long, wide and deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:
(ii) The cost of sheet for it, if a sheet measuring costs Rs 20.
Q : 1 A plastic box long, wide and deep is to be made. It is opened at the top. Ignoring the thickness of the plastic sheet, determine:
(i) The area of the sheet required for making the box.