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CBSE MATH STUDY: Assignment CBSE IX Mathematics Surface area and... : 1.The diameter of garden cylindrical roller is 2.8m long . How much area will it cover in 100 revolutions. 2. A rectangular piece of paper 16 cm by 3.5cm is rotated about the longer side. Find the total surface area of the solid so generated. 3. In a hot water heating system, there is a cylindrical pipe of length 35m and radius 4cm find the total radiating surface in the system 4. Find the curved surface area of the right circular cone whose slant height is 10cm and base radius is 7cm. IX Mathematics Surface area and... :

1. Relative density of silver is 10.8. The density of water is 10 3   Kgm -3 . What is the density of silver in SI unit?  Ans: Relative density of silver = 10.8 Relative density of water = 10 3   Kgm -3 Density of silver = Relative density of silver x Relative density of water = 10.8 x 10 3   Kgm -3 2. Is potential energy a vector or a scalar quantity? Ans: Potential energy is a scalar quantity. 3. (i) Give any two examples of longitudinal waves.(ii) What is the most essential property of a wave motion and why? Ans: (a) i. Waves produced in air. ii. When a freely suspended spring is pulled downwards and released, longitudinal waves are produced. (b) The most essential property of a wave motion is its frequency. Frequency of a wave is its inherent characteristic and does not change by the change in temperature, pressure or change in medium. 4. (a) Calculate the work done in lifting 200 kg of water through a vertical height 6 meter. (Assuming g = 10m

CBSE CTET Answer Key 2012 Paper-I Primary Classes (set-A) 01. (4)   02. (2)   03. (4)   04. (3)   05. (2)     06. (3)   07. (4)   08. (2)   09. (1)   10. (4) 11. (2)   12. (3)   13. (3)   14. (3)   15. (1)    16. (4)   17. (1)   18. (3)   19. (3)   20. (1) 21. (1)   22. (4)   23. (1)   24. (1)   25. (4)     26. (4)   27. (2)   28. (2)   29. (3)   30. (3) 31. (2)   32. (2)   33. (3)   34. (3)   35. (4)    36. (2)   37. (3)   38. (2)   39. (4)   40. (3) 41. (1)   42. (4)   43. (4)   44. (3)   45. (2)   46. (3)   47. (4)   48. (4)   49. (3)   50. (4) 51. (3)   52. (1)   53. (3)   54. (1)   55. (4)  56. (3)   57. (4)   58. (3)   59. (3)   60. (3) 61. (4)   62. (1)   63. (1)   64. (4)   65. (3)   66. (2)   67. (1)   68. (2)   69. (2)   70. (4) 71. (2)   72. (3)   73. (4)   74. (1)   75. (3)   76. (3)   77. (4)   78. (3)   79. (3)   80. (3) 81. (1)   82. (1)   83. (3)   84. (4)   85. (2)  86. (4)   87. (3)   88. (4)   89. (2)   90. (1) 91. (3)   92. (2)   93. (3)   94. (4)   95. (2)  96. (1