Question

Questions in this section carry 1 mark each.
The Case study based question is compulsory. Attempt all 4 sub-parts from
each question 7 (i - iv)
7. A metal box with a square base and vertical sides to contain 1024 cm of water.
The material for the top and bottom costs Rs.5 per cm2 and the material for
the side costs Rs.2.5 per cm? Answer the following:
(i) Amount of water the box can hold?
(a) 1024
(b) 102400L (C) 1.024L
(ii) Length, Breadth and Height of the box is respectively:
(a) x, x, y
(b) x, y, x
(C) y, x, x
(d) y, x, x
(iii) Least Surface area of the box is?
(a) 600cma
(b) 611cm2 (c) 609cm2
(d) 605.6cm
(iv) Least cost of making box?
(a) Rs.2000.0
(b) Rs.1920.0 (c) Rs.1500.0 (d) Rs.1800.0
(d) 10.24L

Answer 1

Answer:

step by step explanation

Answer 2

Answer:

Given the volume of the box = 1024 cm3

Let the length of the side of square base be x cm and height of the box be y cm.

∴ volume of the box V = x2y = 1024