Page 1
NATIONAL TALENT SEARCH EXAMINATION, 2017-18
MENTAL ABILITY ANSWER KEY
QUE. 1 2 3 4 5 6 7 8 9 10
ANS. 1 4 1 4 2 4 3 1 4 1
QUE. 11 12 13 14 15 16 17 18 19 20
ANS. 2 2 1 3 2 2 4 3 4 3
QUE. 21 22 23 24 25 26 27 28 29 30
ANS. 3 1 3 2 2 3 1 3 2 4
QUE. 31 32 33 34 35 36 37 38 39 40
ANS. 3 1 3 2 3 4 2 3 1 1
QUE. 41 42 43 44 45 46 47 48 49 50
ANS. 2 1 4 2,4 2 1 1 3 4 3
MENTAL ABILITY SOLUTIONS
1. (1) FN
Logic B J D L H P P X F N
2 10 4 12 8 16 16 24 32 40
32 = 26 + 6 = F
40 = 26 + 14 = N
2. (4)
+4 +4 +4 +4
AYCD EUGH IQKL MZBC
MZBC
(3
rd
placed – 1) will give 2
nd
place and opposite like B – 1 = A opposite Z.
3. (1)
Only 141 is not a prime no.
4. (4)
Sum of all number
6 + 1 + 3 + 1 = 11
2 + 1 + 9 + 1 ? 13
3 + 3 + 1 + 2 ? 9
3 + 1 + 6 + 4 ? 14 (14 is even)
5. (2)
4 8 12 16
D H L P
6 14 21 28
F N U B
11 22 33 44
K V G R
Page 2
NATIONAL TALENT SEARCH EXAMINATION, 2017-18
MENTAL ABILITY ANSWER KEY
QUE. 1 2 3 4 5 6 7 8 9 10
ANS. 1 4 1 4 2 4 3 1 4 1
QUE. 11 12 13 14 15 16 17 18 19 20
ANS. 2 2 1 3 2 2 4 3 4 3
QUE. 21 22 23 24 25 26 27 28 29 30
ANS. 3 1 3 2 2 3 1 3 2 4
QUE. 31 32 33 34 35 36 37 38 39 40
ANS. 3 1 3 2 3 4 2 3 1 1
QUE. 41 42 43 44 45 46 47 48 49 50
ANS. 2 1 4 2,4 2 1 1 3 4 3
MENTAL ABILITY SOLUTIONS
1. (1) FN
Logic B J D L H P P X F N
2 10 4 12 8 16 16 24 32 40
32 = 26 + 6 = F
40 = 26 + 14 = N
2. (4)
+4 +4 +4 +4
AYCD EUGH IQKL MZBC
MZBC
(3
rd
placed – 1) will give 2
nd
place and opposite like B – 1 = A opposite Z.
3. (1)
Only 141 is not a prime no.
4. (4)
Sum of all number
6 + 1 + 3 + 1 = 11
2 + 1 + 9 + 1 ? 13
3 + 3 + 1 + 2 ? 9
3 + 1 + 6 + 4 ? 14 (14 is even)
5. (2)
4 8 12 16
D H L P
6 14 21 28
F N U B
11 22 33 44
K V G R
G 33 ? 26 + 7
R 26 + 18 ? R
6. (4)
7. (3)
155 by BODMAS
200
25 20 5 10
5
? ? ? ?
8. (1)
4 side divided into 4
10 side divided into 10
9. (4)
Mirror image + Centre rotating
10. (1)
11. (2)
1 6 5
1 3 1
2 3 4
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
difference
Similarly
5 3 3
2 6 2
7 9 1
12. (2)
Logical
13. (1)
B E A T
28
2 5 1 20 2 5 1 20 7
4
? ? ? ? ? ?
Logic ? Sum of all place then divide by 4.
14. (3)
Logic Pattern N K M L J O Q P K
15. (2)
Logical
16. (2)
S O L V E
0 1 2 3 4 logic
S P N Y I
? ? ? ? ?
17. (4)
L A R G E
1 1 1 1 1
K Z Q F D
? ? ? ? ?
18. (3)
Logical
M T K A S N
3 4 1 , 5 7 2 , 7 8 1 , 9 9 0
+2 +2 +2
3 + 1 = 4
5 + 2 = 7
7 + 1 = 8
9 + 0 = 9
Page 3
NATIONAL TALENT SEARCH EXAMINATION, 2017-18
MENTAL ABILITY ANSWER KEY
QUE. 1 2 3 4 5 6 7 8 9 10
ANS. 1 4 1 4 2 4 3 1 4 1
QUE. 11 12 13 14 15 16 17 18 19 20
ANS. 2 2 1 3 2 2 4 3 4 3
QUE. 21 22 23 24 25 26 27 28 29 30
ANS. 3 1 3 2 2 3 1 3 2 4
QUE. 31 32 33 34 35 36 37 38 39 40
ANS. 3 1 3 2 3 4 2 3 1 1
QUE. 41 42 43 44 45 46 47 48 49 50
ANS. 2 1 4 2,4 2 1 1 3 4 3
MENTAL ABILITY SOLUTIONS
1. (1) FN
Logic B J D L H P P X F N
2 10 4 12 8 16 16 24 32 40
32 = 26 + 6 = F
40 = 26 + 14 = N
2. (4)
+4 +4 +4 +4
AYCD EUGH IQKL MZBC
MZBC
(3
rd
placed – 1) will give 2
nd
place and opposite like B – 1 = A opposite Z.
3. (1)
Only 141 is not a prime no.
4. (4)
Sum of all number
6 + 1 + 3 + 1 = 11
2 + 1 + 9 + 1 ? 13
3 + 3 + 1 + 2 ? 9
3 + 1 + 6 + 4 ? 14 (14 is even)
5. (2)
4 8 12 16
D H L P
6 14 21 28
F N U B
11 22 33 44
K V G R
G 33 ? 26 + 7
R 26 + 18 ? R
6. (4)
7. (3)
155 by BODMAS
200
25 20 5 10
5
? ? ? ?
8. (1)
4 side divided into 4
10 side divided into 10
9. (4)
Mirror image + Centre rotating
10. (1)
11. (2)
1 6 5
1 3 1
2 3 4
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
difference
Similarly
5 3 3
2 6 2
7 9 1
12. (2)
Logical
13. (1)
B E A T
28
2 5 1 20 2 5 1 20 7
4
? ? ? ? ? ?
Logic ? Sum of all place then divide by 4.
14. (3)
Logic Pattern N K M L J O Q P K
15. (2)
Logical
16. (2)
S O L V E
0 1 2 3 4 logic
S P N Y I
? ? ? ? ?
17. (4)
L A R G E
1 1 1 1 1
K Z Q F D
? ? ? ? ?
18. (3)
Logical
M T K A S N
3 4 1 , 5 7 2 , 7 8 1 , 9 9 0
+2 +2 +2
3 + 1 = 4
5 + 2 = 7
7 + 1 = 8
9 + 0 = 9
19. (4)
Logical
20. (3)
8
21. (3)
9 10 34 35
57 58 66 67
61 44 48 63
22. (1)
See the logic of the numbers from pattern.
23. (3)
27 ? 2 ? 5 + 2 ? 2 ? 3 + 1 ? 5
24. (2)
13
25. (2)
26. (3)
N
2
– 8
27. (1)
Logic pattern
28. (3)
2 ? 2 + 2 ? 6
6 ? 3 + 3 ? 21
21 ? 4 + 4 ? 88
88 ? 5 + 5 ? 445
29. (2)
2
2
+ 2 ? 6
3
3
+ 3 ? 30
4
2
+ 2 ? 18
5
3
+ 3 ? 128
6
2
+ 2 ? 38
30. (4)
02, 13, 34, 56
Check row and column.
31. (3)
11, 13, 67, 69
Check row and column.
32. (1)
1 October was Monday So, 4 November will be Sunday
33. (3)
All boxes shifting one down the column.
34. (2)
Logical
35. (3)
A M K
18 , 3 , 1
S P J
?
?
? ? ?
?
?
?
Similarly,
K N M
18 , 3 , 1
C Q L
?
?
? ? ?
?
?
?
36. (4)
Page 4
NATIONAL TALENT SEARCH EXAMINATION, 2017-18
MENTAL ABILITY ANSWER KEY
QUE. 1 2 3 4 5 6 7 8 9 10
ANS. 1 4 1 4 2 4 3 1 4 1
QUE. 11 12 13 14 15 16 17 18 19 20
ANS. 2 2 1 3 2 2 4 3 4 3
QUE. 21 22 23 24 25 26 27 28 29 30
ANS. 3 1 3 2 2 3 1 3 2 4
QUE. 31 32 33 34 35 36 37 38 39 40
ANS. 3 1 3 2 3 4 2 3 1 1
QUE. 41 42 43 44 45 46 47 48 49 50
ANS. 2 1 4 2,4 2 1 1 3 4 3
MENTAL ABILITY SOLUTIONS
1. (1) FN
Logic B J D L H P P X F N
2 10 4 12 8 16 16 24 32 40
32 = 26 + 6 = F
40 = 26 + 14 = N
2. (4)
+4 +4 +4 +4
AYCD EUGH IQKL MZBC
MZBC
(3
rd
placed – 1) will give 2
nd
place and opposite like B – 1 = A opposite Z.
3. (1)
Only 141 is not a prime no.
4. (4)
Sum of all number
6 + 1 + 3 + 1 = 11
2 + 1 + 9 + 1 ? 13
3 + 3 + 1 + 2 ? 9
3 + 1 + 6 + 4 ? 14 (14 is even)
5. (2)
4 8 12 16
D H L P
6 14 21 28
F N U B
11 22 33 44
K V G R
G 33 ? 26 + 7
R 26 + 18 ? R
6. (4)
7. (3)
155 by BODMAS
200
25 20 5 10
5
? ? ? ?
8. (1)
4 side divided into 4
10 side divided into 10
9. (4)
Mirror image + Centre rotating
10. (1)
11. (2)
1 6 5
1 3 1
2 3 4
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
difference
Similarly
5 3 3
2 6 2
7 9 1
12. (2)
Logical
13. (1)
B E A T
28
2 5 1 20 2 5 1 20 7
4
? ? ? ? ? ?
Logic ? Sum of all place then divide by 4.
14. (3)
Logic Pattern N K M L J O Q P K
15. (2)
Logical
16. (2)
S O L V E
0 1 2 3 4 logic
S P N Y I
? ? ? ? ?
17. (4)
L A R G E
1 1 1 1 1
K Z Q F D
? ? ? ? ?
18. (3)
Logical
M T K A S N
3 4 1 , 5 7 2 , 7 8 1 , 9 9 0
+2 +2 +2
3 + 1 = 4
5 + 2 = 7
7 + 1 = 8
9 + 0 = 9
19. (4)
Logical
20. (3)
8
21. (3)
9 10 34 35
57 58 66 67
61 44 48 63
22. (1)
See the logic of the numbers from pattern.
23. (3)
27 ? 2 ? 5 + 2 ? 2 ? 3 + 1 ? 5
24. (2)
13
25. (2)
26. (3)
N
2
– 8
27. (1)
Logic pattern
28. (3)
2 ? 2 + 2 ? 6
6 ? 3 + 3 ? 21
21 ? 4 + 4 ? 88
88 ? 5 + 5 ? 445
29. (2)
2
2
+ 2 ? 6
3
3
+ 3 ? 30
4
2
+ 2 ? 18
5
3
+ 3 ? 128
6
2
+ 2 ? 38
30. (4)
02, 13, 34, 56
Check row and column.
31. (3)
11, 13, 67, 69
Check row and column.
32. (1)
1 October was Monday So, 4 November will be Sunday
33. (3)
All boxes shifting one down the column.
34. (2)
Logical
35. (3)
A M K
18 , 3 , 1
S P J
?
?
? ? ?
?
?
?
Similarly,
K N M
18 , 3 , 1
C Q L
?
?
? ? ?
?
?
?
36. (4)
N 9 M
2 , 2 , 4
P 11 Q
?
?
? ? ?
?
?
?
Similarly,
K N M
2 , 12 , 4
C Q L
?
?
? ?
?
?
?
37. (2)
6 km (Direction sense test question)
38. (3)
Logic 0001 0011 0111 1111
39. (1)
PLAYERS Foot Ball Base Ball Cricket Volley Ball Hockey
Hemant ? ? ? ? ?
Madhav ? ? ? ? ?
Govind ? ? ? ? ?
Ramesh ? ? ? ? ?
Anant ? ? ? ? ?
40. (1)
PLAYERS Foot Ball Base Ball Cricket Volley Ball Hockey
Hemant ? ? ? ? ?
Madhav ? ? ? ? ?
Govind ? ? ? ? ?
Ramesh ? ? ? ? ?
Anant ? ? ? ? ?
41. (2)
Logical
42. (1)
Logical
43. (4)
Folding logic
44. (2) & (4) both option are correct
45. (2)
13 1 3 4
So, 10 4 6
19 1 9 10
? ? ? ?
? ?
?
? ? ?
?
Similarly,
31 3 1 4
So, 10 4 6
37 3 7 10
? ? ? ?
? ?
?
? ? ?
?
46. (1)
2
3
8 64
7 343
?
?
2
3
7 49
6 216
?
?
Similarly,
2
3
6 36
8 512
?
?
47. (1)
Logic unfolding
48. (3)
Logical
49. (4)
Logical Venn Diagram
Page 5
NATIONAL TALENT SEARCH EXAMINATION, 2017-18
MENTAL ABILITY ANSWER KEY
QUE. 1 2 3 4 5 6 7 8 9 10
ANS. 1 4 1 4 2 4 3 1 4 1
QUE. 11 12 13 14 15 16 17 18 19 20
ANS. 2 2 1 3 2 2 4 3 4 3
QUE. 21 22 23 24 25 26 27 28 29 30
ANS. 3 1 3 2 2 3 1 3 2 4
QUE. 31 32 33 34 35 36 37 38 39 40
ANS. 3 1 3 2 3 4 2 3 1 1
QUE. 41 42 43 44 45 46 47 48 49 50
ANS. 2 1 4 2,4 2 1 1 3 4 3
MENTAL ABILITY SOLUTIONS
1. (1) FN
Logic B J D L H P P X F N
2 10 4 12 8 16 16 24 32 40
32 = 26 + 6 = F
40 = 26 + 14 = N
2. (4)
+4 +4 +4 +4
AYCD EUGH IQKL MZBC
MZBC
(3
rd
placed – 1) will give 2
nd
place and opposite like B – 1 = A opposite Z.
3. (1)
Only 141 is not a prime no.
4. (4)
Sum of all number
6 + 1 + 3 + 1 = 11
2 + 1 + 9 + 1 ? 13
3 + 3 + 1 + 2 ? 9
3 + 1 + 6 + 4 ? 14 (14 is even)
5. (2)
4 8 12 16
D H L P
6 14 21 28
F N U B
11 22 33 44
K V G R
G 33 ? 26 + 7
R 26 + 18 ? R
6. (4)
7. (3)
155 by BODMAS
200
25 20 5 10
5
? ? ? ?
8. (1)
4 side divided into 4
10 side divided into 10
9. (4)
Mirror image + Centre rotating
10. (1)
11. (2)
1 6 5
1 3 1
2 3 4
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
difference
Similarly
5 3 3
2 6 2
7 9 1
12. (2)
Logical
13. (1)
B E A T
28
2 5 1 20 2 5 1 20 7
4
? ? ? ? ? ?
Logic ? Sum of all place then divide by 4.
14. (3)
Logic Pattern N K M L J O Q P K
15. (2)
Logical
16. (2)
S O L V E
0 1 2 3 4 logic
S P N Y I
? ? ? ? ?
17. (4)
L A R G E
1 1 1 1 1
K Z Q F D
? ? ? ? ?
18. (3)
Logical
M T K A S N
3 4 1 , 5 7 2 , 7 8 1 , 9 9 0
+2 +2 +2
3 + 1 = 4
5 + 2 = 7
7 + 1 = 8
9 + 0 = 9
19. (4)
Logical
20. (3)
8
21. (3)
9 10 34 35
57 58 66 67
61 44 48 63
22. (1)
See the logic of the numbers from pattern.
23. (3)
27 ? 2 ? 5 + 2 ? 2 ? 3 + 1 ? 5
24. (2)
13
25. (2)
26. (3)
N
2
– 8
27. (1)
Logic pattern
28. (3)
2 ? 2 + 2 ? 6
6 ? 3 + 3 ? 21
21 ? 4 + 4 ? 88
88 ? 5 + 5 ? 445
29. (2)
2
2
+ 2 ? 6
3
3
+ 3 ? 30
4
2
+ 2 ? 18
5
3
+ 3 ? 128
6
2
+ 2 ? 38
30. (4)
02, 13, 34, 56
Check row and column.
31. (3)
11, 13, 67, 69
Check row and column.
32. (1)
1 October was Monday So, 4 November will be Sunday
33. (3)
All boxes shifting one down the column.
34. (2)
Logical
35. (3)
A M K
18 , 3 , 1
S P J
?
?
? ? ?
?
?
?
Similarly,
K N M
18 , 3 , 1
C Q L
?
?
? ? ?
?
?
?
36. (4)
N 9 M
2 , 2 , 4
P 11 Q
?
?
? ? ?
?
?
?
Similarly,
K N M
2 , 12 , 4
C Q L
?
?
? ?
?
?
?
37. (2)
6 km (Direction sense test question)
38. (3)
Logic 0001 0011 0111 1111
39. (1)
PLAYERS Foot Ball Base Ball Cricket Volley Ball Hockey
Hemant ? ? ? ? ?
Madhav ? ? ? ? ?
Govind ? ? ? ? ?
Ramesh ? ? ? ? ?
Anant ? ? ? ? ?
40. (1)
PLAYERS Foot Ball Base Ball Cricket Volley Ball Hockey
Hemant ? ? ? ? ?
Madhav ? ? ? ? ?
Govind ? ? ? ? ?
Ramesh ? ? ? ? ?
Anant ? ? ? ? ?
41. (2)
Logical
42. (1)
Logical
43. (4)
Folding logic
44. (2) & (4) both option are correct
45. (2)
13 1 3 4
So, 10 4 6
19 1 9 10
? ? ? ?
? ?
?
? ? ?
?
Similarly,
31 3 1 4
So, 10 4 6
37 3 7 10
? ? ? ?
? ?
?
? ? ?
?
46. (1)
2
3
8 64
7 343
?
?
2
3
7 49
6 216
?
?
Similarly,
2
3
6 36
8 512
?
?
47. (1)
Logic unfolding
48. (3)
Logical
49. (4)
Logical Venn Diagram
50. (3)
Logical Venn Diagram
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