51. 2.2 cubic dm of lead is to be drawn into a cylindrical wire 0.50 cm diameter. Find the length of the wire in metres.
A.252m B.112m
C.212m D.111m
52.
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A cistern of capacity 8000 litres measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. The thickness of the bottom is:
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53. The radii of two cylinders are in the ratio 3: 5 and their heights are in tbe ratio of 2 : 3. Find the ratio of their curved surface areas.
A.5.2 B.2.5
C.1.5 D.None
54.
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What is the total surface area of a right circular cone of height 14 cm and base radius 7 cm?
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344.35 cm2
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462 cm2
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498.35 cm2
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None of these
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55. How many cubes of 10 cm edge can be put in a cubical box of 1 m edge?
A. 10 B. 100
C. 1000 D. 10000
56. A rectangular block 6 cm by 12 cm by 15 cm is cut up into an exact number of equal cubes. Find the least possible number of cubes.
A.40 B.10
C.25 D.5
57. The cost of the paint is Rs. 36.50 per kg. If 1 kg of paint covers 16 squares feet, how much will it cost to paint outside of a cube having 8 feet each side?
A. Rs. 692 B. Rs. 768
C. Rs. 876 D. Rs. 972
58.
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A large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. What is the ratio of the total surface areas of the smaller cubes and the large cube?
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2 : 1
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3 : 2
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25 : 18
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27 : 20
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59. A cube of edge 15 cm is immersed completely in a rectangular vessel containing water . If the dimensions of the base of vessel are 20 cm x 15 cm, find the rise in water level.
A.25.1cm B.11.25cm
C.5.1 cm D.None
60.
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How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?
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