Quantitative Apitude-Volume & Surface Area
Quantitative Apitude-Volume & Surface Area
21. A tank 4 m long, 2.5 m wide and 1.5 m wide is dug in a field 31 m long and 10 m wide. If the earth dug out is evenly sperad out is evenly spread out over the field, the rise in level of the field is :
- 3.1 cm
- 6.2 cm
- 5 cm
- 4.8 cm
22. If each edgeoff a cube is doubled, then its volume :
- is doubed
- becomes 4 times
- Becomes 6 times
- becomes 8 times
23. If each edge of a cube is increased by 25 %, then the percentage increase in its surface area is :
- 25%
- 50%
- 48.75%
- 56.25%
24. Two cubes have their volumes in the ratio 8 : 27. The ratio of their surface area is :
- 2 : 3
- 3 : 2
- 4 : 9
- 64 : 729
25. A cube of side 6 cm is cut into a number of cubes, each of side 2 cm. The number of cubes will be :
- 6
- 9
- 12
- 27
26. If the areas of three adjacent faces of a rectangular block are in the ratio of 2 : 3 : 4 and its volume is 9000 cu.cm; then the length of the shortest side is :
- 10 cm
- 15 cm
- 20 cm
- 30 cm
27. The percentage increase in the surface area of a cube when each side is doubled, is :
- 25 %
- 50 %
- 150 %
- 300 %
28. The radii of two cylinders are in the ratio of 2 : 3 and their heights are in the ratio 5 : 3. The ratio o their volumes is :
- 4 :9
- 9 : 4
- 20 : 27
- 27 : 20
29. The number of coins 1.5 cm in diameter and 0.2 cm thick to be melted to form a right circular cylinder of height 10 cm and diameter 4.5 cm, is :
- 380
- 450
- 472
- 540
30. A cylindrical vessel 60 cm in diameter is partially filled with water. A sphere 30 cm is diameter is dropped into it. The increse in the level of water in the vessel is :
- 2 cm
- 3 cm
- 4 cm
- 5 cm