Page 1
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
FIITJEE ANSWER KEYS
1. Bonus 2. 1 3. 3 4. 2
5. 3 6. 4 7. 1 8. 2
9. 4 10. 2 11. 2 12. 4
13. 1 14. 4 15. 1 16. 3
17. 4 18. 2 19. 4 20. 1
21. 4 22. 3 23. 4 24. 4
25. 3 26. 2 27. 1 28. 1
29. 3 30. 4 31. 4 32. 2
33. 1 34. 3 35. 2 36. 1
37. 3 38. 4 39. 1 40. 3
41. 1 42. 4 43. 1 44. 2
45. 3 46. 2 47. Bonus 48. 4
49. 3 50. 2 51. 4 52. 3
53. 2 54. 2 55. 3 56. 1
57. 2 58. 4 59. 2 60. 4
61. 1 62. 1 63. 2 64. 4
65. 3 66. 2 67. 3 68. 1
69. 3 70. 2 71. 4 72. 1
73. 3 74. 4 75. 3 76. 1
77. Bonus 78. 2 79. 4 80. 4
81. 3 82. 3 83. 4 84. 4
85. 2 86. 3 87. 3 88. 2
89. 3 90. 3 91. 1 92. 4
93. 4 94. 3 95. 2 96. 2
97. 3 98. 4 99. 2 100. 4
Page 2
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
FIITJEE ANSWER KEYS
1. Bonus 2. 1 3. 3 4. 2
5. 3 6. 4 7. 1 8. 2
9. 4 10. 2 11. 2 12. 4
13. 1 14. 4 15. 1 16. 3
17. 4 18. 2 19. 4 20. 1
21. 4 22. 3 23. 4 24. 4
25. 3 26. 2 27. 1 28. 1
29. 3 30. 4 31. 4 32. 2
33. 1 34. 3 35. 2 36. 1
37. 3 38. 4 39. 1 40. 3
41. 1 42. 4 43. 1 44. 2
45. 3 46. 2 47. Bonus 48. 4
49. 3 50. 2 51. 4 52. 3
53. 2 54. 2 55. 3 56. 1
57. 2 58. 4 59. 2 60. 4
61. 1 62. 1 63. 2 64. 4
65. 3 66. 2 67. 3 68. 1
69. 3 70. 2 71. 4 72. 1
73. 3 74. 4 75. 3 76. 1
77. Bonus 78. 2 79. 4 80. 4
81. 3 82. 3 83. 4 84. 4
85. 2 86. 3 87. 3 88. 2
89. 3 90. 3 91. 1 92. 4
93. 4 94. 3 95. 2 96. 2
97. 3 98. 4 99. 2 100. 4
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
SOLUTIONS
1. Bonus
2. 1
2. 20% of x = y
20
xy
100
??
=
??
??
y % of 20
y 20 1
20 x 20
100 100 100
??
? = ? ?
??
??
=
4x
4% of x
100
=
3. 3
3.
nn
a 3 4 =+
Put n = 1, 1, 3 [series will be 7, 10, 13, …]
a = 7, d = 2, n = 12
( )
12
n
s 2a n 1 d
2
?? = + -
??
= ( ) ( )
12
2 7 12 1 3
2
?? +-
??
= ( ) 6 14 39 282 +=
4. 2
4. Time taken by slower train to pass the driver ? distance would be 500 m.
Time =
500 18
24 sec
45 30 5
?=
+
5. 3
5. 18, 50, 98,...
3 2,5 2,7 2 9 2 162 ?=
6. 4
6.
pq
am
+
=
pq
an
-
=
( ) a p q 1 d m + + - = ( ) a p q 1 d n + - - =
Add both equations
( ) 2a 2 p 1 d m n + - = +
P
th
term ( )
mn
a p 1 d
2
+
+ - =
Page 3
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
FIITJEE ANSWER KEYS
1. Bonus 2. 1 3. 3 4. 2
5. 3 6. 4 7. 1 8. 2
9. 4 10. 2 11. 2 12. 4
13. 1 14. 4 15. 1 16. 3
17. 4 18. 2 19. 4 20. 1
21. 4 22. 3 23. 4 24. 4
25. 3 26. 2 27. 1 28. 1
29. 3 30. 4 31. 4 32. 2
33. 1 34. 3 35. 2 36. 1
37. 3 38. 4 39. 1 40. 3
41. 1 42. 4 43. 1 44. 2
45. 3 46. 2 47. Bonus 48. 4
49. 3 50. 2 51. 4 52. 3
53. 2 54. 2 55. 3 56. 1
57. 2 58. 4 59. 2 60. 4
61. 1 62. 1 63. 2 64. 4
65. 3 66. 2 67. 3 68. 1
69. 3 70. 2 71. 4 72. 1
73. 3 74. 4 75. 3 76. 1
77. Bonus 78. 2 79. 4 80. 4
81. 3 82. 3 83. 4 84. 4
85. 2 86. 3 87. 3 88. 2
89. 3 90. 3 91. 1 92. 4
93. 4 94. 3 95. 2 96. 2
97. 3 98. 4 99. 2 100. 4
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
SOLUTIONS
1. Bonus
2. 1
2. 20% of x = y
20
xy
100
??
=
??
??
y % of 20
y 20 1
20 x 20
100 100 100
??
? = ? ?
??
??
=
4x
4% of x
100
=
3. 3
3.
nn
a 3 4 =+
Put n = 1, 1, 3 [series will be 7, 10, 13, …]
a = 7, d = 2, n = 12
( )
12
n
s 2a n 1 d
2
?? = + -
??
= ( ) ( )
12
2 7 12 1 3
2
?? +-
??
= ( ) 6 14 39 282 +=
4. 2
4. Time taken by slower train to pass the driver ? distance would be 500 m.
Time =
500 18
24 sec
45 30 5
?=
+
5. 3
5. 18, 50, 98,...
3 2,5 2,7 2 9 2 162 ?=
6. 4
6.
pq
am
+
=
pq
an
-
=
( ) a p q 1 d m + + - = ( ) a p q 1 d n + - - =
Add both equations
( ) 2a 2 p 1 d m n + - = +
P
th
term ( )
mn
a p 1 d
2
+
+ - =
7. 1
7. Speed equation
600 600
400
1
t
t
2
-=
+
By hit and trial method
T = 1 hour
8. 2
8. Horizontal and vertical distance are same.
perpendicular
tan 1
base
? = =
? = 45
0
9. 4
9. Girls (those who wear spectacles)
=
25 5
1400 250
100 7
? ? =
10. 2
10. P Q R
65x6 : 84x5 : 100x3
13 : 14 : 10
P takes 5% i.e.,
5
7400 370
100
?=
Balance = 7400 – 370 = 7030
Q’s share =
14
7030 2660
37
?=
11. 2
11. Distance = ( )
Pr oduct of speed
Diff. between arrival time
Diff. of speed
?
=
10 15 12
6 km
5 60
?
?=
12. 4
12.
24 7
tan cos
7 25
? = ? =
14tan 75cos 7sec ? - ? - ?
=
24 7 25
14 75 7
7 25 7
? - ? - ?
= 48 – 21 – 25 = 2
13. 1
13.
2
2
1
x 2 98 2
x
??
+ + = +
??
??
1
x 10
x
+=
Page 4
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
FIITJEE ANSWER KEYS
1. Bonus 2. 1 3. 3 4. 2
5. 3 6. 4 7. 1 8. 2
9. 4 10. 2 11. 2 12. 4
13. 1 14. 4 15. 1 16. 3
17. 4 18. 2 19. 4 20. 1
21. 4 22. 3 23. 4 24. 4
25. 3 26. 2 27. 1 28. 1
29. 3 30. 4 31. 4 32. 2
33. 1 34. 3 35. 2 36. 1
37. 3 38. 4 39. 1 40. 3
41. 1 42. 4 43. 1 44. 2
45. 3 46. 2 47. Bonus 48. 4
49. 3 50. 2 51. 4 52. 3
53. 2 54. 2 55. 3 56. 1
57. 2 58. 4 59. 2 60. 4
61. 1 62. 1 63. 2 64. 4
65. 3 66. 2 67. 3 68. 1
69. 3 70. 2 71. 4 72. 1
73. 3 74. 4 75. 3 76. 1
77. Bonus 78. 2 79. 4 80. 4
81. 3 82. 3 83. 4 84. 4
85. 2 86. 3 87. 3 88. 2
89. 3 90. 3 91. 1 92. 4
93. 4 94. 3 95. 2 96. 2
97. 3 98. 4 99. 2 100. 4
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
SOLUTIONS
1. Bonus
2. 1
2. 20% of x = y
20
xy
100
??
=
??
??
y % of 20
y 20 1
20 x 20
100 100 100
??
? = ? ?
??
??
=
4x
4% of x
100
=
3. 3
3.
nn
a 3 4 =+
Put n = 1, 1, 3 [series will be 7, 10, 13, …]
a = 7, d = 2, n = 12
( )
12
n
s 2a n 1 d
2
?? = + -
??
= ( ) ( )
12
2 7 12 1 3
2
?? +-
??
= ( ) 6 14 39 282 +=
4. 2
4. Time taken by slower train to pass the driver ? distance would be 500 m.
Time =
500 18
24 sec
45 30 5
?=
+
5. 3
5. 18, 50, 98,...
3 2,5 2,7 2 9 2 162 ?=
6. 4
6.
pq
am
+
=
pq
an
-
=
( ) a p q 1 d m + + - = ( ) a p q 1 d n + - - =
Add both equations
( ) 2a 2 p 1 d m n + - = +
P
th
term ( )
mn
a p 1 d
2
+
+ - =
7. 1
7. Speed equation
600 600
400
1
t
t
2
-=
+
By hit and trial method
T = 1 hour
8. 2
8. Horizontal and vertical distance are same.
perpendicular
tan 1
base
? = =
? = 45
0
9. 4
9. Girls (those who wear spectacles)
=
25 5
1400 250
100 7
? ? =
10. 2
10. P Q R
65x6 : 84x5 : 100x3
13 : 14 : 10
P takes 5% i.e.,
5
7400 370
100
?=
Balance = 7400 – 370 = 7030
Q’s share =
14
7030 2660
37
?=
11. 2
11. Distance = ( )
Pr oduct of speed
Diff. between arrival time
Diff. of speed
?
=
10 15 12
6 km
5 60
?
?=
12. 4
12.
24 7
tan cos
7 25
? = ? =
14tan 75cos 7sec ? - ? - ?
=
24 7 25
14 75 7
7 25 7
? - ? - ?
= 48 – 21 – 25 = 2
13. 1
13.
2
2
1
x 2 98 2
x
??
+ + = +
??
??
1
x 10
x
+=
3
3
3
1 1 1
x x 3 x
x x x
? ? ? ?
+ = + - +
? ? ? ?
? ? ? ?
=
3
10 3 10 -?
= 1000 – 30 = 970
14. 4
14. d. maximum
b. minimum
b. monk
a. music
option (4) d, c, b, a
15. 1
15. Let present age of father and son be 7x and 3x.
After 10 years it will be
(7x + 10) and (3x + 10)
According to question
7x 10 2
3x 10 1
+
=
+
7x + 10 = 6x + 20
x = 10
? present age of father is 7x i.e., 7 x 10 = 70 years
16. 3
16. Sum of students in 2017
= 32 + 24 + 17 + 24 + 23 = 120
Sum of students in 2018
= 18 + 16 + 29 + 11 + 21 = 95
Difference = 120 – 95 = 25
17. 4
17. Sum of students in class III.
= 39 + 33 + 52 + 17 + 29 = 170
Sum of students in class I.
= 22 + 28 + 26 + 32 + 18 = 126
Require answer =
170
100 134.92
126
?=
Approx = 135
18. 2
18. Sum of students in 2018
= 18 + 16 + 29 + 11 + 21 = 95
Square = (95)
2
= 9025
19. 4
19. Student in class I in 2017 = 32
Student in class II in 2017 = 24
Require answer =
32 24
100
24
-
?
=
8
100 33.33%
24
?=
Page 5
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
FIITJEE ANSWER KEYS
1. Bonus 2. 1 3. 3 4. 2
5. 3 6. 4 7. 1 8. 2
9. 4 10. 2 11. 2 12. 4
13. 1 14. 4 15. 1 16. 3
17. 4 18. 2 19. 4 20. 1
21. 4 22. 3 23. 4 24. 4
25. 3 26. 2 27. 1 28. 1
29. 3 30. 4 31. 4 32. 2
33. 1 34. 3 35. 2 36. 1
37. 3 38. 4 39. 1 40. 3
41. 1 42. 4 43. 1 44. 2
45. 3 46. 2 47. Bonus 48. 4
49. 3 50. 2 51. 4 52. 3
53. 2 54. 2 55. 3 56. 1
57. 2 58. 4 59. 2 60. 4
61. 1 62. 1 63. 2 64. 4
65. 3 66. 2 67. 3 68. 1
69. 3 70. 2 71. 4 72. 1
73. 3 74. 4 75. 3 76. 1
77. Bonus 78. 2 79. 4 80. 4
81. 3 82. 3 83. 4 84. 4
85. 2 86. 3 87. 3 88. 2
89. 3 90. 3 91. 1 92. 4
93. 4 94. 3 95. 2 96. 2
97. 3 98. 4 99. 2 100. 4
NTSE STAGE – I (DELHI STATE)
003 –A (2020 – 21)
(For Class – X)
MENTAL ABILITY TEST (MAT)
SOLUTIONS
1. Bonus
2. 1
2. 20% of x = y
20
xy
100
??
=
??
??
y % of 20
y 20 1
20 x 20
100 100 100
??
? = ? ?
??
??
=
4x
4% of x
100
=
3. 3
3.
nn
a 3 4 =+
Put n = 1, 1, 3 [series will be 7, 10, 13, …]
a = 7, d = 2, n = 12
( )
12
n
s 2a n 1 d
2
?? = + -
??
= ( ) ( )
12
2 7 12 1 3
2
?? +-
??
= ( ) 6 14 39 282 +=
4. 2
4. Time taken by slower train to pass the driver ? distance would be 500 m.
Time =
500 18
24 sec
45 30 5
?=
+
5. 3
5. 18, 50, 98,...
3 2,5 2,7 2 9 2 162 ?=
6. 4
6.
pq
am
+
=
pq
an
-
=
( ) a p q 1 d m + + - = ( ) a p q 1 d n + - - =
Add both equations
( ) 2a 2 p 1 d m n + - = +
P
th
term ( )
mn
a p 1 d
2
+
+ - =
7. 1
7. Speed equation
600 600
400
1
t
t
2
-=
+
By hit and trial method
T = 1 hour
8. 2
8. Horizontal and vertical distance are same.
perpendicular
tan 1
base
? = =
? = 45
0
9. 4
9. Girls (those who wear spectacles)
=
25 5
1400 250
100 7
? ? =
10. 2
10. P Q R
65x6 : 84x5 : 100x3
13 : 14 : 10
P takes 5% i.e.,
5
7400 370
100
?=
Balance = 7400 – 370 = 7030
Q’s share =
14
7030 2660
37
?=
11. 2
11. Distance = ( )
Pr oduct of speed
Diff. between arrival time
Diff. of speed
?
=
10 15 12
6 km
5 60
?
?=
12. 4
12.
24 7
tan cos
7 25
? = ? =
14tan 75cos 7sec ? - ? - ?
=
24 7 25
14 75 7
7 25 7
? - ? - ?
= 48 – 21 – 25 = 2
13. 1
13.
2
2
1
x 2 98 2
x
??
+ + = +
??
??
1
x 10
x
+=
3
3
3
1 1 1
x x 3 x
x x x
? ? ? ?
+ = + - +
? ? ? ?
? ? ? ?
=
3
10 3 10 -?
= 1000 – 30 = 970
14. 4
14. d. maximum
b. minimum
b. monk
a. music
option (4) d, c, b, a
15. 1
15. Let present age of father and son be 7x and 3x.
After 10 years it will be
(7x + 10) and (3x + 10)
According to question
7x 10 2
3x 10 1
+
=
+
7x + 10 = 6x + 20
x = 10
? present age of father is 7x i.e., 7 x 10 = 70 years
16. 3
16. Sum of students in 2017
= 32 + 24 + 17 + 24 + 23 = 120
Sum of students in 2018
= 18 + 16 + 29 + 11 + 21 = 95
Difference = 120 – 95 = 25
17. 4
17. Sum of students in class III.
= 39 + 33 + 52 + 17 + 29 = 170
Sum of students in class I.
= 22 + 28 + 26 + 32 + 18 = 126
Require answer =
170
100 134.92
126
?=
Approx = 135
18. 2
18. Sum of students in 2018
= 18 + 16 + 29 + 11 + 21 = 95
Square = (95)
2
= 9025
19. 4
19. Student in class I in 2017 = 32
Student in class II in 2017 = 24
Require answer =
32 24
100
24
-
?
=
8
100 33.33%
24
?=
20. 1
20. Cube is 3 – d form of square similarly cuboid is 3 – d form of rectangle.
21. 4
21. 82 : 9
?
2
9 1 82 +=
Similarly option (4)
2
5 1 26 +=
22. 3
22. A = 1 x 2 = 2
T = 20 x 2 = 40
1 and 20 are respective position of A and T is in alphabet.
Similarly ACT = 2 + 6 + 40 = 48
TAKE = 40 + 2 + 22 + 10 = 74
23. 4
23.
126 98 70 41
14
42
28 28 28 28
24. 4
24.
1 3 7 15
31
63
x2+1
65
127
x2+1 x2+1 x2+1 x2+1
x2+1
25. 3
25. 126
7 28 63 124 215 344
? ? ? ? ? ?
3
21 -
3
31 +
3
41 -
3
51 +
3
61 -
3
71 +
26. 2
26.
A D E G I J M M
Q P
+4
U P
+4 +4 +4 +4
+3 +3 +3 +3 +3
U S
27. 1
27.
Z8 W5 T2 Q8 N5 K3
26 ? 2 + 6 = 8 20 ? 2 + 0 = 2 14 ? 1 + 4 = 5
23 ? 2 + 3 = 5 17 ? 1 + 7 = 8 11 ? 1 + 1 = 2
K2
28. 1
Read More