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Monday 25 June 2012

OFFICIAL ANSWER KEY OF NTSE STAGE 2-DECLARED BY NCERT


Official Answer Keys MAT-http://www.ncert.nic.in/oth_anoun/Keys-2012.pdf
Official Answer keys SAT-http://www.ncert.nic.in/oth_anoun/Keys-2012.pdf
pdf file: Click here

SAT Answer Key
  1. 1
  2. 3
  3. 4
  4. 1
  5. 2
  6. 2
  7. As per NCERT , Q not considered ----------------2
  8. 4 - Not a good question. Many times the grain produced is also used as a seed in case of wheat, rice etc. - NCERTalso has decided not to include this question while calculating marks.
  9. 1
  10. 3
  11. 2
  12. As per NCERT - 3 - Aerobic respiration is respiration which uses oxygen:
    glucose + oxygen = water + carbon dioxide + ENERGY
    C6H12O6 + 6O2 = 6H2O + 6CO2 + ENERGY
    Aerobic respiration is the same in animals and plants.

    2) Anaerobic respiration is respiration without using oxygen. This is different in plants and animals.
    In plants:
    glucose = carbon dioxide + ethanol (alcohol) + ENERGY
    C6H12O6 = 2CO2 + 2C2H5OH + ENERGY
    In animals:
    glucose = lactic acid + ENERGY
    C6H12O6 = 2C3H6O3 + ENERGY . If we start eliminating options, 2 comes out to be the only answer. It is helping in photosynthesis and nothing to do directly with respiration.
  13. 1
  14. 3
  15. 3
  16. 1
  17. 2
  18. 2
  19. 1
  20. 1
  21. 4 - The heads of safety matches are composed of a single part. They contain antimony trisulfide, potassium chlorate, sulfur, powdered glass, inert fillers, and animal glue. They may also include a water-soluble dye. Antimony trisulfide cannot be ignited by the heat of friction, even in the presence of an oxidizing agent like potassium chlorate, and it requires another source of ignition to start the combustion. That source of ignition comes from the striking surface, which is deposited on the side of the matchbox or on the back cover of the matchbook. The striking surface contains red phosphorus, powdered glass, and an adhesive such as gum arabic or urea formaldehyde. When a safety match is rubbed against the striking surface, the friction generates enough heat to convert a trace of the red phosphorus into white phosphorus. This immediately reacts with the potassium chlorate in the match head to produce enough heat to ignite the antimony trisulfide and start the combustion.
  22. 4
  23. 2
  24. 2
  25. 4
  26. 1
  27. 3
  28. 2
  29. 1
  30. 3
  31. 2.
    This question was exactly copy paste by the NCERT -
    Atmospheric pressure in the center of a tropical cyclone is ______________.
    A)very high because of converging winds
    B)very high because of sinking warm air
    C)very low because of rising warm air
    D)very low because of dense sinking air
  32. 2
  33. 1
  34. 2
  35. 3
  36. 1
  37. 1
  38. 1
  39. 1
  40. 3
  41. 2
  42. 3
  43. 4
  44. 3
  45. 2
  46. 2
  47. 1
  48. 3
  49. 4
  50. 4
  51. 2
  52. 3
  53. 4
  54. 4
  55. As per NCERT - 2 ---------------------3
  56. 3
  57. 3
  58. As per NCERT 1 ---------------------------------3
  59. 3
  60. 3
  61. 4
  62. 3
  63. 1
  64. 1
  65. 3
  66. 2
  67. As per NCERT - 2 ------------------------3
  68. 4
  69. 2
  70. As per NCERT - 4 -----------------------------------------3 - 3 is the correct option, but in NCERT it was mentioned according to which correct option is 4. Student should be given bonus point in this case.
  71. As per NCERT - Q not consideredt ----------------------4
  72. 3
  73. 2
  74. 4
  75. 3
  76. 2
  77. 3
  78. 4
  79. 4
  80. 4
  81. 1
  82. As per NCERT - 2 -------------------------------3
  83. 4
  84. 4
  85. 2
  86. 4
  87. 3
  88. 3
  89. 1
  90. 4
  91. 3
  92. 4
  93. 3
  94. 4
  95. 3
  96. 2
  97. 3
  98. 4
  99. 2
  100. 3
In case if you find any error, then please email us with details.
MAT Answer Key (to be uploaded)
  1. 2
  2. 2
  3. 3
  4. 1
  5. 2
  6. 3
  7. 4
  8. 1
  9. 4
  10. 4
  11. 3
  12. 4
  13. 2
  14. 3
  15. x There are 12 such numbers
  16. 2
  17. 4
  18. 3
  19. 2
  20. 1
  21. 1
  22. 2
  23. 4
  24. 3
  25. 2
  26. 3
  27. 1
  28. Q not considered by NCERT - 3
  29. 3
  30. 2
  31. 4
  32. 3
  33. 4
  34. 1
  35. 2
  36. 2
  37. 4
  38. 1
  39. 2
  40. 2
  41. 2
  42. 1
  43. 1
  44. 3
  45. 3
  46. 2
  47. 4
  48. 3
  49. 1
  50. 1
  51. Question not considered by NCERT - 1 - to be updated
  52. Question not considered by NCERT - 3 - - to be updated
  53. 2
  54. 4
  55. 3
  56. 1
  57. 2
  58. 1
  59. 2
  60. 2
  61. As per NCERT - 2 --------------------------3
  62. 2
  63. 1
  64. 2
  65. 2
  66. 3
  67. 4
  68. 4
  69. 3
  70. 2
  71. 2
  72. 2
  73. 4
  74. 1
  75. 2
  76. 1
  77. 2
  78. 3
  79. 3
  80. 4
  81. 3
  82. 1
  83. 3
  84. 2
  85. As per NCERT, Q not considered. 1
  86. 1
  87. 2
  88. 2
  89. 1
  90. 2
  91. 2
  92. 2
  93. 4
  94. 2
  95. 3
  96. 1
  97. 1
  98. 3
  99. 4
  100. 2



Question No. 90 (SAT): In English it is mentioned “ cold streams” while in Hindi it is written “garam dharayein” . All Hindi students should be given bonus points.
There are few questions, which could have been more clear if NCERT has taken some precau
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