81). The slant height of a cone is 85 cm. Its altitude is 13 cm. The total surface area is.
| A). 44616 sq. cm. |
| B). 44661 sq. cm. |
| C). 46461 sq. cm. |
| D). 66441 sq.cm. |
|
82). The diameter of a sphere whose volume is 1\( \Large 179\frac{2}{3} \) cubic metres is.
| A). 7 mts. |
| B). 9 mts. |
| C). 5 mts. |
| D). 11 mts. |
|
83). A cube of volume \( \Large 27 m^{3} \) is coloured on all the faces. Now the cube is divided into 27 equal cubes of volume 1 cubic metre. The number of cubes which are not coloured on all the faces is.
| A). 4 |
| B). 1 |
| C). 6 |
| D). None of these |
|
84). Total surface area of a solid cylinder with a diameter of 14 cm and height 20 cms, is.
| A). \( \Large 2376 cm^{2} \) |
| B). \( \Large 1188 cm^{2} \) |
| C). \( \Large 880 cm^{2} \) |
| D). \( \Large 594 cm^{2} \) |
|
85). A cone, a hemisphere and a cylinder stand on equal bases and have same height. The ratio of their volumes is.
| A). 2: 3: 4 |
| B). 1: 3: 2 |
| C). 1: 2: 3 |
| D). 4: 3: 1 |
|
86). The area of a rectangular field is 460 square metres. If the length is 15 per cent more than the breadth, what is breadth of the rectangular field ?
| A). 15 metres |
| B). 26 metres |
| C). 34.5 metres |
| D). None of these |
|
87). What will be the cost of gardening 1 metre broad boundary around a rectangular plot having perimeter of 340 metres at the rate of Rs.10 per square metre ?
| A). Rs. 3,400/- |
| B). Rs. 1,700/- |
| C). Rs. 3,440/- |
| D). Cannot be determined |
|
88). What would be the cost of building a 7 metres wide garden around a circular field with diameter equal to 280 metres if the cost per sq. metre for building the garden is Rs. 21 ?
| A). Rs. 1,56,242 |
| B). Rs. 2,48,521 |
| C). Rs. 1,11,624 |
| D). None of these |
|
89). The ratio of length and breadth of a rectangular plot is 8 : 5 respectively. If the breadth is 60 metre less than the length, what is the perimeter of the rectangular plot ?
| A). 260 metres |
| B). 1600 metres |
| C). 500 metres |
| D). None of these |
|
90). What will be the area (in square metres) of 1.5 metre wide garden developed around all the four sides of a rectangular field having area equal to 300 square metres and breadth equal to three-fourth of the length ?
| A). 96 |
| B). 105 |
| C). 114 |
| D). Cannot be determined |
|
