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NTSE  2019 SOLUTIONS – Stage I (Andhra Pradesh State) 
(For class X Students) 
 
SCHOLASTIC APTITUDE TEST 
 
HISTORY 
 1. 1  2. 2  3. 4  4. 4  
 5. 4  6. 3  7. 1  8. 2  
 9. 3  10. 3  11. 3  12. 3  
PHYSICS 
 
 13. 2  14. 4  15. 3  16. 2 
17. 2  18. 3  19. 1  20.1 & 3 
21. 3  22. 1  23. 3  24. 4 
25. 4 
ECONOMICS 
 
26. 1  27. 1  28. 2  29. 3  
30. 4  31. 4  32. 4  33. 2 
 
POLITICAL SCIENCE 
 
34. 3  35. 2  36. 3  37. 1  
38. 3  39. 4  40. 2  41. 1 
 
CHEMISTRY 
 
42. 3  43. 4  44. 1  45. 2 
46. 2  47. 3  48. 4  49. 1 
50. 3  51. 3  52.  4  53. 4 
54. 2 
GEOGRAPHY 
55. 3  56. 1  57. 4  58. 3 
59. 3  60. 3  61. 3  62. 2  
63. 4  64. 4  65. 3  66. 2  
Page 2


   
 
NTSE  2019 SOLUTIONS – Stage I (Andhra Pradesh State) 
(For class X Students) 
 
SCHOLASTIC APTITUDE TEST 
 
HISTORY 
 1. 1  2. 2  3. 4  4. 4  
 5. 4  6. 3  7. 1  8. 2  
 9. 3  10. 3  11. 3  12. 3  
PHYSICS 
 
 13. 2  14. 4  15. 3  16. 2 
17. 2  18. 3  19. 1  20.1 & 3 
21. 3  22. 1  23. 3  24. 4 
25. 4 
ECONOMICS 
 
26. 1  27. 1  28. 2  29. 3  
30. 4  31. 4  32. 4  33. 2 
 
POLITICAL SCIENCE 
 
34. 3  35. 2  36. 3  37. 1  
38. 3  39. 4  40. 2  41. 1 
 
CHEMISTRY 
 
42. 3  43. 4  44. 1  45. 2 
46. 2  47. 3  48. 4  49. 1 
50. 3  51. 3  52.  4  53. 4 
54. 2 
GEOGRAPHY 
55. 3  56. 1  57. 4  58. 3 
59. 3  60. 3  61. 3  62. 2  
63. 4  64. 4  65. 3  66. 2  
   
 
BIOLOGY 
 
67.  4  68. 4  69. 3  70. 1  
71. 1  72. 4  73. 4  74. 4  
75. 1  76. 2  77. 1   78. 4 
79. 4  80. 2  
 
MATHEMATICS 
81. 4  82. 4  83. 2  84. 3 
85. 1  86. 1  87. 1  88. 2 
89. 1  90. 4  91.  3  92. 2 
93. 3  94.  2  95. 1  96. 3 
97. 1  98. 3  99.  1  100. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Page 3


   
 
NTSE  2019 SOLUTIONS – Stage I (Andhra Pradesh State) 
(For class X Students) 
 
SCHOLASTIC APTITUDE TEST 
 
HISTORY 
 1. 1  2. 2  3. 4  4. 4  
 5. 4  6. 3  7. 1  8. 2  
 9. 3  10. 3  11. 3  12. 3  
PHYSICS 
 
 13. 2  14. 4  15. 3  16. 2 
17. 2  18. 3  19. 1  20.1 & 3 
21. 3  22. 1  23. 3  24. 4 
25. 4 
ECONOMICS 
 
26. 1  27. 1  28. 2  29. 3  
30. 4  31. 4  32. 4  33. 2 
 
POLITICAL SCIENCE 
 
34. 3  35. 2  36. 3  37. 1  
38. 3  39. 4  40. 2  41. 1 
 
CHEMISTRY 
 
42. 3  43. 4  44. 1  45. 2 
46. 2  47. 3  48. 4  49. 1 
50. 3  51. 3  52.  4  53. 4 
54. 2 
GEOGRAPHY 
55. 3  56. 1  57. 4  58. 3 
59. 3  60. 3  61. 3  62. 2  
63. 4  64. 4  65. 3  66. 2  
   
 
BIOLOGY 
 
67.  4  68. 4  69. 3  70. 1  
71. 1  72. 4  73. 4  74. 4  
75. 1  76. 2  77. 1   78. 4 
79. 4  80. 2  
 
MATHEMATICS 
81. 4  82. 4  83. 2  84. 3 
85. 1  86. 1  87. 1  88. 2 
89. 1  90. 4  91.  3  92. 2 
93. 3  94.  2  95. 1  96. 3 
97. 1  98. 3  99.  1  100. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
SOLUTIONS: 
HISTORY 
1.1 2.2 3.4 4.4 5.4 6.3 7.1 8.2 9.3 
10.3 11.3 12.3  
PHYSICS 
 
13.2 
Sol. If speed vs time graph is not a straight line then acceleration is variable 
14.4 
Sol. 
1 1 1 1 1 1
30 20 V u f V
? ? ? ? ?
?
 
 
1 1 1 1
20 30 60 V
? ? ? ? 
 60 V c m ? 
15.3 
Sol. Factual question 
 
j upi t e r s a t u r n e ar t h ma r s
g g g g ? ? ? 
16.2 
Sol. 
2 2
1 1 1
0
V U
V u f V U
? ?
? ? ? ? ? 
17.2 
Sol. 
2 2 55
0.33
330
s ou nd
l
t i m e s
V
?
? ? ? 
18.3 
Sol. 
2
V
R
P
? 
2 2
1 2
1 2
1 2
: :
V V
R R
P P
? ? 
19.1 
Sol. Conceptual 
20.1 & 3 
Sol. 
? ?
F q V B ? ?
? ? ? ?
 
 A is at positive potential / charge 
 B is at negative potential / charge 
21.3 
Sol. Gravitational field is conservative 
22.1 
Sol. Using Kirchoff’s laws 
Page 4


   
 
NTSE  2019 SOLUTIONS – Stage I (Andhra Pradesh State) 
(For class X Students) 
 
SCHOLASTIC APTITUDE TEST 
 
HISTORY 
 1. 1  2. 2  3. 4  4. 4  
 5. 4  6. 3  7. 1  8. 2  
 9. 3  10. 3  11. 3  12. 3  
PHYSICS 
 
 13. 2  14. 4  15. 3  16. 2 
17. 2  18. 3  19. 1  20.1 & 3 
21. 3  22. 1  23. 3  24. 4 
25. 4 
ECONOMICS 
 
26. 1  27. 1  28. 2  29. 3  
30. 4  31. 4  32. 4  33. 2 
 
POLITICAL SCIENCE 
 
34. 3  35. 2  36. 3  37. 1  
38. 3  39. 4  40. 2  41. 1 
 
CHEMISTRY 
 
42. 3  43. 4  44. 1  45. 2 
46. 2  47. 3  48. 4  49. 1 
50. 3  51. 3  52.  4  53. 4 
54. 2 
GEOGRAPHY 
55. 3  56. 1  57. 4  58. 3 
59. 3  60. 3  61. 3  62. 2  
63. 4  64. 4  65. 3  66. 2  
   
 
BIOLOGY 
 
67.  4  68. 4  69. 3  70. 1  
71. 1  72. 4  73. 4  74. 4  
75. 1  76. 2  77. 1   78. 4 
79. 4  80. 2  
 
MATHEMATICS 
81. 4  82. 4  83. 2  84. 3 
85. 1  86. 1  87. 1  88. 2 
89. 1  90. 4  91.  3  92. 2 
93. 3  94.  2  95. 1  96. 3 
97. 1  98. 3  99.  1  100. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
SOLUTIONS: 
HISTORY 
1.1 2.2 3.4 4.4 5.4 6.3 7.1 8.2 9.3 
10.3 11.3 12.3  
PHYSICS 
 
13.2 
Sol. If speed vs time graph is not a straight line then acceleration is variable 
14.4 
Sol. 
1 1 1 1 1 1
30 20 V u f V
? ? ? ? ?
?
 
 
1 1 1 1
20 30 60 V
? ? ? ? 
 60 V c m ? 
15.3 
Sol. Factual question 
 
j upi t e r s a t u r n e ar t h ma r s
g g g g ? ? ? 
16.2 
Sol. 
2 2
1 1 1
0
V U
V u f V U
? ?
? ? ? ? ? 
17.2 
Sol. 
2 2 55
0.33
330
s ou nd
l
t i m e s
V
?
? ? ? 
18.3 
Sol. 
2
V
R
P
? 
2 2
1 2
1 2
1 2
: :
V V
R R
P P
? ? 
19.1 
Sol. Conceptual 
20.1 & 3 
Sol. 
? ?
F q V B ? ?
? ? ? ?
 
 A is at positive potential / charge 
 B is at negative potential / charge 
21.3 
Sol. Gravitational field is conservative 
22.1 
Sol. Using Kirchoff’s laws 
   
 
 Net resistance of circuit is 8 ? 
 Current = 
3
0.375
8
A
R
?
? ? 
23.3 
Sol. 2
e f f l e ns m i r r o r
P P P ? ? 
 
1
l e ns
l e ns
P
f
? ,  
1
m i rror
m i r r o r
P
f
?
? 
 
2 1 1
1
1 20
? ? ? ?
? ? ?
? ? ? ?
?
? ? ? ?
 
1
10
? 
 
1 1
2
10 5
e f f
P ? ? ? 
 Focal length = 5cm 
24.4 
Sol. If particle is in uniform circular motion velocity changes but speed does not change. 
25.4 
Sol. 
r e d y e l l ow gr e e n b l u e
f f f f ? ? ? 
 
ECONOMICS 
 
26.1 27.1 28.2 29.3 30.4 31.4 32.4 33.2 
 
POLITICAL SCIENCE 
 
34.3 35.2 36.3 37.1 38.3 39.4 40.2 41.1 
 
CHEMISTRY 
 
42.3 
Sol. 
3 2 2
A l Mg F O
? ? ? ?
? ? ? 
 
? ?
? ?
? ? ? ?
3 2 2
9 13 8
12
10 10 10
10
: / A l M g F O z e v al ue s
? ? ? ?
? ? ? 
43.4 
Sol.  
Element (given) Atomic number Element name 
A 9 Fluorine 
Page 5


   
 
NTSE  2019 SOLUTIONS – Stage I (Andhra Pradesh State) 
(For class X Students) 
 
SCHOLASTIC APTITUDE TEST 
 
HISTORY 
 1. 1  2. 2  3. 4  4. 4  
 5. 4  6. 3  7. 1  8. 2  
 9. 3  10. 3  11. 3  12. 3  
PHYSICS 
 
 13. 2  14. 4  15. 3  16. 2 
17. 2  18. 3  19. 1  20.1 & 3 
21. 3  22. 1  23. 3  24. 4 
25. 4 
ECONOMICS 
 
26. 1  27. 1  28. 2  29. 3  
30. 4  31. 4  32. 4  33. 2 
 
POLITICAL SCIENCE 
 
34. 3  35. 2  36. 3  37. 1  
38. 3  39. 4  40. 2  41. 1 
 
CHEMISTRY 
 
42. 3  43. 4  44. 1  45. 2 
46. 2  47. 3  48. 4  49. 1 
50. 3  51. 3  52.  4  53. 4 
54. 2 
GEOGRAPHY 
55. 3  56. 1  57. 4  58. 3 
59. 3  60. 3  61. 3  62. 2  
63. 4  64. 4  65. 3  66. 2  
   
 
BIOLOGY 
 
67.  4  68. 4  69. 3  70. 1  
71. 1  72. 4  73. 4  74. 4  
75. 1  76. 2  77. 1   78. 4 
79. 4  80. 2  
 
MATHEMATICS 
81. 4  82. 4  83. 2  84. 3 
85. 1  86. 1  87. 1  88. 2 
89. 1  90. 4  91.  3  92. 2 
93. 3  94.  2  95. 1  96. 3 
97. 1  98. 3  99.  1  100. 2 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
SOLUTIONS: 
HISTORY 
1.1 2.2 3.4 4.4 5.4 6.3 7.1 8.2 9.3 
10.3 11.3 12.3  
PHYSICS 
 
13.2 
Sol. If speed vs time graph is not a straight line then acceleration is variable 
14.4 
Sol. 
1 1 1 1 1 1
30 20 V u f V
? ? ? ? ?
?
 
 
1 1 1 1
20 30 60 V
? ? ? ? 
 60 V c m ? 
15.3 
Sol. Factual question 
 
j upi t e r s a t u r n e ar t h ma r s
g g g g ? ? ? 
16.2 
Sol. 
2 2
1 1 1
0
V U
V u f V U
? ?
? ? ? ? ? 
17.2 
Sol. 
2 2 55
0.33
330
s ou nd
l
t i m e s
V
?
? ? ? 
18.3 
Sol. 
2
V
R
P
? 
2 2
1 2
1 2
1 2
: :
V V
R R
P P
? ? 
19.1 
Sol. Conceptual 
20.1 & 3 
Sol. 
? ?
F q V B ? ?
? ? ? ?
 
 A is at positive potential / charge 
 B is at negative potential / charge 
21.3 
Sol. Gravitational field is conservative 
22.1 
Sol. Using Kirchoff’s laws 
   
 
 Net resistance of circuit is 8 ? 
 Current = 
3
0.375
8
A
R
?
? ? 
23.3 
Sol. 2
e f f l e ns m i r r o r
P P P ? ? 
 
1
l e ns
l e ns
P
f
? ,  
1
m i rror
m i r r o r
P
f
?
? 
 
2 1 1
1
1 20
? ? ? ?
? ? ?
? ? ? ?
?
? ? ? ?
 
1
10
? 
 
1 1
2
10 5
e f f
P ? ? ? 
 Focal length = 5cm 
24.4 
Sol. If particle is in uniform circular motion velocity changes but speed does not change. 
25.4 
Sol. 
r e d y e l l ow gr e e n b l u e
f f f f ? ? ? 
 
ECONOMICS 
 
26.1 27.1 28.2 29.3 30.4 31.4 32.4 33.2 
 
POLITICAL SCIENCE 
 
34.3 35.2 36.3 37.1 38.3 39.4 40.2 41.1 
 
CHEMISTRY 
 
42.3 
Sol. 
3 2 2
A l Mg F O
? ? ? ?
? ? ? 
 
? ?
? ?
? ? ? ?
3 2 2
9 13 8
12
10 10 10
10
: / A l M g F O z e v al ue s
? ? ? ?
? ? ? 
43.4 
Sol.  
Element (given) Atomic number Element name 
A 9 Fluorine 
   
 
B 10 Neon 
C 11 Sodium 
D 12 Magnesium 
 ? ? ? ? ? ? ? ? B i n e r t ga s A h al og e n D f ul l y f i l l e d s o rbi t al C al k al i m e t al ? ? ? ? 
44.1 
Sol. Stainless steel is iron – chromium – nickel alloy with small amounts of carbon 
45.2 
Sol. Based on metal reactivity series (Fe – black ppt) 
46.2 
Sol. Ethane : 
3
3 3
: 2 C H C H s p c ar bon s ? 
 Ethylene : 
2
2 2
: 2 C H C H sp ? carbons 
 Acetylene : : 2 C H C H s p ? carbons 
 Benzene :   : 
2
6 s p carbons 
47.3 
Sol. 
4 12 20 38
, , , B e Mg C a Sr 
48.4 
Sol. 
. 1.9 1.22 2.5 3.0
S i P C N
E N
? ? ?
?
 
 In the periodic table : 
C
N
S i P
. E N d e c r e a s e s
. E N i n c r e a s e s
 
49.1 
Sol. 
? ?
? ?
? ?
? ? 3 2 3
2
2 2
aq a q
s
y e l l ow ppt
K I P b N O P bI K N O ? ? ? ? 
50.3 
Sol. 
C H
3
C
CH
3
OH
CH
2
C O O H
4
3
2
1
 
 3 – Hydroxy – 3- methyl butanoic acid 
51.3 
Sol. A (group IIIA) ? valency = 3

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Document Description: Andhra Pradesh: State Level Answer Key (SAT) - 2019-20 for Class 10 2024 is part of NTSE for Class 10 preparation. The notes and questions for Andhra Pradesh: State Level Answer Key (SAT) - 2019-20 have been prepared according to the Class 10 exam syllabus. Information about Andhra Pradesh: State Level Answer Key (SAT) - 2019-20 covers topics like and Andhra Pradesh: State Level Answer Key (SAT) - 2019-20 Example, for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Andhra Pradesh: State Level Answer Key (SAT) - 2019-20.

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