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1 
                                                                  Marking Scheme  
 Class X Session 2024-25  
MATHEMATICS BASIC (Code No.241)  
TIME: 3 hours                                                                                                   MAX.MARKS: 80 
 
 
 
Q. No.                                                     Section A Marks 
1.      B) 90 1 
2. A) consistent with unique solution 1 
3. D) 7 1 
4. 
C) 2 v?? 2
+ ?? 2
 
1 
5. D) 145
°
 1 
6. B) 15 cm 1 
7. 
A) 
5
4
 
1 
8. 
B) ?? ??????   
1 
9. 
C) 3780 
1 
10. 
B) 40 
1 
11. 
D) 52
°
 
1 
12. 
B) 5 cm 
1 
13. 
A) cos 60
°
 
1 
14. 
(C) 3?? ?? 2
 
1 
15. 
D) 4 
1 
16. 
B) real and equal 
1 
17. 
C) 30 - 40 
1 
18. 
D) 25?? 2
- 5?? - 2 
1 
19. A) Both assertion (A) and reason (R) are true and reason (R) is the correct 
explanation of assertion (A) 
1 
20. C) Assertion (A) is true but reason (R) is false. 
 
1 
                                              
                                             Section B 
 
Page 2


1 
                                                                  Marking Scheme  
 Class X Session 2024-25  
MATHEMATICS BASIC (Code No.241)  
TIME: 3 hours                                                                                                   MAX.MARKS: 80 
 
 
 
Q. No.                                                     Section A Marks 
1.      B) 90 1 
2. A) consistent with unique solution 1 
3. D) 7 1 
4. 
C) 2 v?? 2
+ ?? 2
 
1 
5. D) 145
°
 1 
6. B) 15 cm 1 
7. 
A) 
5
4
 
1 
8. 
B) ?? ??????   
1 
9. 
C) 3780 
1 
10. 
B) 40 
1 
11. 
D) 52
°
 
1 
12. 
B) 5 cm 
1 
13. 
A) cos 60
°
 
1 
14. 
(C) 3?? ?? 2
 
1 
15. 
D) 4 
1 
16. 
B) real and equal 
1 
17. 
C) 30 - 40 
1 
18. 
D) 25?? 2
- 5?? - 2 
1 
19. A) Both assertion (A) and reason (R) are true and reason (R) is the correct 
explanation of assertion (A) 
1 
20. C) Assertion (A) is true but reason (R) is false. 
 
1 
                                              
                                             Section B 
 
2 
21 (A). ???? 2
 = ???? 2
 
? (?? - 4)
2
 + (?? - 3)
2
  = (?? - 3)
2
 + (?? - 4)
2
 
? ?? = ??    ????   ?? - ?? = 0  
 
1 
1 
 OR  
21 (B). AB = 6 cm = AC 
 
OC = v36 - 9   = 3v3  cm 
     Point C is (3v3, 0) 
½ 
 
1 
½ 
22.                                                                                             Correct figure 
 
AM = 4 cm 
 
OM = v????
2   
- ????
2
     
       = v5
2   
- 4
2
 
       = 3 cm 
½ 
 
 
 
 
 
 
½ 
 
 
 
 
1 
 
23 (A). 
12
2
[2 × 20 + 11?? ]=900 
? ?? = 10  
Also ?? 12
= 20 + 11 × 10 = 130 
 
½ 
1 
½ 
 OR  
23 (B). Putting ?? = 1,  ?? 1
= ?? = 6 - 1
2
= 5 . . . . . . . . . . . . . (?? ) 
Putting ?? = 2,   ?? 2
= 2?? + ?? = 6 × 2 - 2
2
= 8 . . . . . . . . . . . . . (???? )  
Solving (i) & (ii)     ?? = -2    
½ 
1 
½ 
24. 
?????? (?? - ?? ) =
1
2
  ? ?? - ?? = 30
°
 ………..(i) 
?????? (?? + ?? ) =
1
2
  ? ?? + ?? = 60
°
 ………..(ii) 
Solving (i) & (ii) to get ?? = 45
°
, ?? = 15
°
 
½ 
 
½ 
½+½ 
25.  
 
 
 
Modal class is 15-20. 
???????? = 15 + 5 × (
15-6
2×15-6-10
)  
    = 18.21(approx.) 
Class 5-10 10-15 15-20 20-25 25-30 30-35 
Frequency 5 6 15 10 5 4 
 
 
 
 
½ 
1 
½ 
 
                                                  Section-C  
  O 
A 
M 
B 
Page 3


1 
                                                                  Marking Scheme  
 Class X Session 2024-25  
MATHEMATICS BASIC (Code No.241)  
TIME: 3 hours                                                                                                   MAX.MARKS: 80 
 
 
 
Q. No.                                                     Section A Marks 
1.      B) 90 1 
2. A) consistent with unique solution 1 
3. D) 7 1 
4. 
C) 2 v?? 2
+ ?? 2
 
1 
5. D) 145
°
 1 
6. B) 15 cm 1 
7. 
A) 
5
4
 
1 
8. 
B) ?? ??????   
1 
9. 
C) 3780 
1 
10. 
B) 40 
1 
11. 
D) 52
°
 
1 
12. 
B) 5 cm 
1 
13. 
A) cos 60
°
 
1 
14. 
(C) 3?? ?? 2
 
1 
15. 
D) 4 
1 
16. 
B) real and equal 
1 
17. 
C) 30 - 40 
1 
18. 
D) 25?? 2
- 5?? - 2 
1 
19. A) Both assertion (A) and reason (R) are true and reason (R) is the correct 
explanation of assertion (A) 
1 
20. C) Assertion (A) is true but reason (R) is false. 
 
1 
                                              
                                             Section B 
 
2 
21 (A). ???? 2
 = ???? 2
 
? (?? - 4)
2
 + (?? - 3)
2
  = (?? - 3)
2
 + (?? - 4)
2
 
? ?? = ??    ????   ?? - ?? = 0  
 
1 
1 
 OR  
21 (B). AB = 6 cm = AC 
 
OC = v36 - 9   = 3v3  cm 
     Point C is (3v3, 0) 
½ 
 
1 
½ 
22.                                                                                             Correct figure 
 
AM = 4 cm 
 
OM = v????
2   
- ????
2
     
       = v5
2   
- 4
2
 
       = 3 cm 
½ 
 
 
 
 
 
 
½ 
 
 
 
 
1 
 
23 (A). 
12
2
[2 × 20 + 11?? ]=900 
? ?? = 10  
Also ?? 12
= 20 + 11 × 10 = 130 
 
½ 
1 
½ 
 OR  
23 (B). Putting ?? = 1,  ?? 1
= ?? = 6 - 1
2
= 5 . . . . . . . . . . . . . (?? ) 
Putting ?? = 2,   ?? 2
= 2?? + ?? = 6 × 2 - 2
2
= 8 . . . . . . . . . . . . . (???? )  
Solving (i) & (ii)     ?? = -2    
½ 
1 
½ 
24. 
?????? (?? - ?? ) =
1
2
  ? ?? - ?? = 30
°
 ………..(i) 
?????? (?? + ?? ) =
1
2
  ? ?? + ?? = 60
°
 ………..(ii) 
Solving (i) & (ii) to get ?? = 45
°
, ?? = 15
°
 
½ 
 
½ 
½+½ 
25.  
 
 
 
Modal class is 15-20. 
???????? = 15 + 5 × (
15-6
2×15-6-10
)  
    = 18.21(approx.) 
Class 5-10 10-15 15-20 20-25 25-30 30-35 
Frequency 5 6 15 10 5 4 
 
 
 
 
½ 
1 
½ 
 
                                                  Section-C  
  O 
A 
M 
B 
3 
26. 
Let v5 be a rational number. 
? v5 =
p
q
 , where q?0 and p & q are coprime. 
5q
2
 = p
2
 ? p
2
 is divisible by 5  
? p is divisible by 5----- (i) 
? p = 3a, where ‘a’ is a postive integer                  
 25a
2
 = 5q
2
 ? q
2 
= 5a
2
 ?q
2
 is divisible by 5 
? q is divisible by 5    ----- (ii) 
(i) and (ii) leads to contradiction as ‘p’ and ‘q’ are coprime. 
? v5 is an irrational number. 
 
½ 
 
1 
 
 
 
1 
½ 
 
27(A). Let the required point on the y axis be P(0,y). 
 
 
 
Let AP : PB be k : 1 
Therefore, 
-?? +4
?? +1
= 0 
?k=4 
Therefore, required ratio is 4:1  
& ?? =
8-5
5
=
3
5
 
Hence point of intersection is (0,
3
5
). 
½ 
 
 
 
 
 
 
 
 
 
 
1 
 
½ 
½ 
½ 
 OR  
27 (B). Let the line 4?? + ?? = 4 intersects AB at ?? (?? 1
, ?? 1
) such that AP: PB=?? :1 
 
 
  ?? 1
=
3?? -2
?? +1
     and  ?? 1
=
5?? -1
?? +1
 
 (?? 1
, ?? 1
) lies on 4?? + ?? = 4  
  
Therefore, 4(
3?? -2
?? +1
)+(
5?? -1
?? +1
)=4 
             ? ?? =1 
    
Required ratio is 1:1 
 
 
 
 
 
 
 
 
 
1 
 
 
½ 
1 
 
½ 
Page 4


1 
                                                                  Marking Scheme  
 Class X Session 2024-25  
MATHEMATICS BASIC (Code No.241)  
TIME: 3 hours                                                                                                   MAX.MARKS: 80 
 
 
 
Q. No.                                                     Section A Marks 
1.      B) 90 1 
2. A) consistent with unique solution 1 
3. D) 7 1 
4. 
C) 2 v?? 2
+ ?? 2
 
1 
5. D) 145
°
 1 
6. B) 15 cm 1 
7. 
A) 
5
4
 
1 
8. 
B) ?? ??????   
1 
9. 
C) 3780 
1 
10. 
B) 40 
1 
11. 
D) 52
°
 
1 
12. 
B) 5 cm 
1 
13. 
A) cos 60
°
 
1 
14. 
(C) 3?? ?? 2
 
1 
15. 
D) 4 
1 
16. 
B) real and equal 
1 
17. 
C) 30 - 40 
1 
18. 
D) 25?? 2
- 5?? - 2 
1 
19. A) Both assertion (A) and reason (R) are true and reason (R) is the correct 
explanation of assertion (A) 
1 
20. C) Assertion (A) is true but reason (R) is false. 
 
1 
                                              
                                             Section B 
 
2 
21 (A). ???? 2
 = ???? 2
 
? (?? - 4)
2
 + (?? - 3)
2
  = (?? - 3)
2
 + (?? - 4)
2
 
? ?? = ??    ????   ?? - ?? = 0  
 
1 
1 
 OR  
21 (B). AB = 6 cm = AC 
 
OC = v36 - 9   = 3v3  cm 
     Point C is (3v3, 0) 
½ 
 
1 
½ 
22.                                                                                             Correct figure 
 
AM = 4 cm 
 
OM = v????
2   
- ????
2
     
       = v5
2   
- 4
2
 
       = 3 cm 
½ 
 
 
 
 
 
 
½ 
 
 
 
 
1 
 
23 (A). 
12
2
[2 × 20 + 11?? ]=900 
? ?? = 10  
Also ?? 12
= 20 + 11 × 10 = 130 
 
½ 
1 
½ 
 OR  
23 (B). Putting ?? = 1,  ?? 1
= ?? = 6 - 1
2
= 5 . . . . . . . . . . . . . (?? ) 
Putting ?? = 2,   ?? 2
= 2?? + ?? = 6 × 2 - 2
2
= 8 . . . . . . . . . . . . . (???? )  
Solving (i) & (ii)     ?? = -2    
½ 
1 
½ 
24. 
?????? (?? - ?? ) =
1
2
  ? ?? - ?? = 30
°
 ………..(i) 
?????? (?? + ?? ) =
1
2
  ? ?? + ?? = 60
°
 ………..(ii) 
Solving (i) & (ii) to get ?? = 45
°
, ?? = 15
°
 
½ 
 
½ 
½+½ 
25.  
 
 
 
Modal class is 15-20. 
???????? = 15 + 5 × (
15-6
2×15-6-10
)  
    = 18.21(approx.) 
Class 5-10 10-15 15-20 20-25 25-30 30-35 
Frequency 5 6 15 10 5 4 
 
 
 
 
½ 
1 
½ 
 
                                                  Section-C  
  O 
A 
M 
B 
3 
26. 
Let v5 be a rational number. 
? v5 =
p
q
 , where q?0 and p & q are coprime. 
5q
2
 = p
2
 ? p
2
 is divisible by 5  
? p is divisible by 5----- (i) 
? p = 3a, where ‘a’ is a postive integer                  
 25a
2
 = 5q
2
 ? q
2 
= 5a
2
 ?q
2
 is divisible by 5 
? q is divisible by 5    ----- (ii) 
(i) and (ii) leads to contradiction as ‘p’ and ‘q’ are coprime. 
? v5 is an irrational number. 
 
½ 
 
1 
 
 
 
1 
½ 
 
27(A). Let the required point on the y axis be P(0,y). 
 
 
 
Let AP : PB be k : 1 
Therefore, 
-?? +4
?? +1
= 0 
?k=4 
Therefore, required ratio is 4:1  
& ?? =
8-5
5
=
3
5
 
Hence point of intersection is (0,
3
5
). 
½ 
 
 
 
 
 
 
 
 
 
 
1 
 
½ 
½ 
½ 
 OR  
27 (B). Let the line 4?? + ?? = 4 intersects AB at ?? (?? 1
, ?? 1
) such that AP: PB=?? :1 
 
 
  ?? 1
=
3?? -2
?? +1
     and  ?? 1
=
5?? -1
?? +1
 
 (?? 1
, ?? 1
) lies on 4?? + ?? = 4  
  
Therefore, 4(
3?? -2
?? +1
)+(
5?? -1
?? +1
)=4 
             ? ?? =1 
    
Required ratio is 1:1 
 
 
 
 
 
 
 
 
 
1 
 
 
½ 
1 
 
½ 
4 
28. 
LHS= (
1
???????? - ???????? )(
1
???????? - ???????? ) 
       =
1-?????? 2
?? ???????? ×
1-??????
2
?? ???????? 
      =
??????
2
?? ???????? ×
?????? 2
?? ???????? 
      =???????? ???????? 
RHS = 
???????? ???????? ?????? 2
?? +??????
2
?? 
         =???????? ???????? = LHS 
½ 
 
1 
 
 
½ 
 
1 
 
29.  
Class x frequency(f) 
?? =
?? - 25
10
 
???? 
0-10 5 6 -2 -12 
10-20 15 10 -1 -10 
20-30 25 15 0 0 
30-40 35 9 1 9 
40-50 45 10 2 20 
  ? ?? =50  
? ???? = 7 
 
???????? = 25 + 10 × (
7
50
)  
           = 26.4 
 
 
 
 
 
 
 
 
 
Correct 
table 
?? ?? ?? 
 
 
 
 
1 
½ 
 
30 (A). 
 
(i) ?? ?????? ? ???????? 
??????? = ???????  
Or OP bisects ??? 
(ii)?? ?????? ? ???????? 
?AQ=QB and  ??????? = ??????? 
AB is a straight line 
therefore   ??????? = ??????? = 90
°
 
Hence OP is right bisector of AB 
                                  
 
 
 
 
 
 
 
 
 
 
1 
 
1 
 
 
1 
 
OR 
 
30 (B). Correct Given, to prove, figure and construction 
Correct proof 
1 
2 
Page 5


1 
                                                                  Marking Scheme  
 Class X Session 2024-25  
MATHEMATICS BASIC (Code No.241)  
TIME: 3 hours                                                                                                   MAX.MARKS: 80 
 
 
 
Q. No.                                                     Section A Marks 
1.      B) 90 1 
2. A) consistent with unique solution 1 
3. D) 7 1 
4. 
C) 2 v?? 2
+ ?? 2
 
1 
5. D) 145
°
 1 
6. B) 15 cm 1 
7. 
A) 
5
4
 
1 
8. 
B) ?? ??????   
1 
9. 
C) 3780 
1 
10. 
B) 40 
1 
11. 
D) 52
°
 
1 
12. 
B) 5 cm 
1 
13. 
A) cos 60
°
 
1 
14. 
(C) 3?? ?? 2
 
1 
15. 
D) 4 
1 
16. 
B) real and equal 
1 
17. 
C) 30 - 40 
1 
18. 
D) 25?? 2
- 5?? - 2 
1 
19. A) Both assertion (A) and reason (R) are true and reason (R) is the correct 
explanation of assertion (A) 
1 
20. C) Assertion (A) is true but reason (R) is false. 
 
1 
                                              
                                             Section B 
 
2 
21 (A). ???? 2
 = ???? 2
 
? (?? - 4)
2
 + (?? - 3)
2
  = (?? - 3)
2
 + (?? - 4)
2
 
? ?? = ??    ????   ?? - ?? = 0  
 
1 
1 
 OR  
21 (B). AB = 6 cm = AC 
 
OC = v36 - 9   = 3v3  cm 
     Point C is (3v3, 0) 
½ 
 
1 
½ 
22.                                                                                             Correct figure 
 
AM = 4 cm 
 
OM = v????
2   
- ????
2
     
       = v5
2   
- 4
2
 
       = 3 cm 
½ 
 
 
 
 
 
 
½ 
 
 
 
 
1 
 
23 (A). 
12
2
[2 × 20 + 11?? ]=900 
? ?? = 10  
Also ?? 12
= 20 + 11 × 10 = 130 
 
½ 
1 
½ 
 OR  
23 (B). Putting ?? = 1,  ?? 1
= ?? = 6 - 1
2
= 5 . . . . . . . . . . . . . (?? ) 
Putting ?? = 2,   ?? 2
= 2?? + ?? = 6 × 2 - 2
2
= 8 . . . . . . . . . . . . . (???? )  
Solving (i) & (ii)     ?? = -2    
½ 
1 
½ 
24. 
?????? (?? - ?? ) =
1
2
  ? ?? - ?? = 30
°
 ………..(i) 
?????? (?? + ?? ) =
1
2
  ? ?? + ?? = 60
°
 ………..(ii) 
Solving (i) & (ii) to get ?? = 45
°
, ?? = 15
°
 
½ 
 
½ 
½+½ 
25.  
 
 
 
Modal class is 15-20. 
???????? = 15 + 5 × (
15-6
2×15-6-10
)  
    = 18.21(approx.) 
Class 5-10 10-15 15-20 20-25 25-30 30-35 
Frequency 5 6 15 10 5 4 
 
 
 
 
½ 
1 
½ 
 
                                                  Section-C  
  O 
A 
M 
B 
3 
26. 
Let v5 be a rational number. 
? v5 =
p
q
 , where q?0 and p & q are coprime. 
5q
2
 = p
2
 ? p
2
 is divisible by 5  
? p is divisible by 5----- (i) 
? p = 3a, where ‘a’ is a postive integer                  
 25a
2
 = 5q
2
 ? q
2 
= 5a
2
 ?q
2
 is divisible by 5 
? q is divisible by 5    ----- (ii) 
(i) and (ii) leads to contradiction as ‘p’ and ‘q’ are coprime. 
? v5 is an irrational number. 
 
½ 
 
1 
 
 
 
1 
½ 
 
27(A). Let the required point on the y axis be P(0,y). 
 
 
 
Let AP : PB be k : 1 
Therefore, 
-?? +4
?? +1
= 0 
?k=4 
Therefore, required ratio is 4:1  
& ?? =
8-5
5
=
3
5
 
Hence point of intersection is (0,
3
5
). 
½ 
 
 
 
 
 
 
 
 
 
 
1 
 
½ 
½ 
½ 
 OR  
27 (B). Let the line 4?? + ?? = 4 intersects AB at ?? (?? 1
, ?? 1
) such that AP: PB=?? :1 
 
 
  ?? 1
=
3?? -2
?? +1
     and  ?? 1
=
5?? -1
?? +1
 
 (?? 1
, ?? 1
) lies on 4?? + ?? = 4  
  
Therefore, 4(
3?? -2
?? +1
)+(
5?? -1
?? +1
)=4 
             ? ?? =1 
    
Required ratio is 1:1 
 
 
 
 
 
 
 
 
 
1 
 
 
½ 
1 
 
½ 
4 
28. 
LHS= (
1
???????? - ???????? )(
1
???????? - ???????? ) 
       =
1-?????? 2
?? ???????? ×
1-??????
2
?? ???????? 
      =
??????
2
?? ???????? ×
?????? 2
?? ???????? 
      =???????? ???????? 
RHS = 
???????? ???????? ?????? 2
?? +??????
2
?? 
         =???????? ???????? = LHS 
½ 
 
1 
 
 
½ 
 
1 
 
29.  
Class x frequency(f) 
?? =
?? - 25
10
 
???? 
0-10 5 6 -2 -12 
10-20 15 10 -1 -10 
20-30 25 15 0 0 
30-40 35 9 1 9 
40-50 45 10 2 20 
  ? ?? =50  
? ???? = 7 
 
???????? = 25 + 10 × (
7
50
)  
           = 26.4 
 
 
 
 
 
 
 
 
 
Correct 
table 
?? ?? ?? 
 
 
 
 
1 
½ 
 
30 (A). 
 
(i) ?? ?????? ? ???????? 
??????? = ???????  
Or OP bisects ??? 
(ii)?? ?????? ? ???????? 
?AQ=QB and  ??????? = ??????? 
AB is a straight line 
therefore   ??????? = ??????? = 90
°
 
Hence OP is right bisector of AB 
                                  
 
 
 
 
 
 
 
 
 
 
1 
 
1 
 
 
1 
 
OR 
 
30 (B). Correct Given, to prove, figure and construction 
Correct proof 
1 
2 
5 
31. Let the two-digit number be 10?? + ?? 
Therefore (10?? + ?? ) + (10?? + ?? ) = 99 
 ? ?? + ?? = 9 ……….(i) 
Also, ?? = 3 + ?? ……..(ii) 
Solving (i) & (ii) to get   ?? = 3 , ?? = 6 
Therefore, required number is 63                               
 
½ 
½ 
½ 
½ 
½ 
½ 
                                           Section D  
32 (A). Let the number of books purchased be ?? 
Therefore, cost price of 1 book = 
1920
?? 
Therefore  
1920
?? -
1920
?? +4
= 24 
                   ? 1920 × 4 = 24?? (?? + 4)  
             or ?? 2
+ 4?? - 320 = 0 
                 ? (?? + 20)(?? - 16) = 0  
                  ? ?? = 16, ?? ? -20   
Number of books bought=16 
Price of each book =
1920
16
= ?120 
 
 
1 
 
1 
 
 
1 
 
1 
 
1 
 OR  
32 (B). Let the initial average speed of the train be ?? km/hr. 
Therefore  
132
?? +
140
?? +4
= 4 
                ? 4?? 2
- 256?? - 528 = 0  
              or ?? 2
- 64?? - 132 = 0 
                 ? (?? - 66)(?? + 2) = 0  
                 ? ?? = 66,  ?? ? -2 
Initial average speed of train= 66 km/hr 
 
Time taken to cover the distances separately=
132
66
 & 
140
70
 i.e. 2 hours each 
 
 
1 
 
1 
1 
 
1 
 
 
1 
33. Correct Given, to prove, Construction and figure 
Correct Proof 
?? ?? × ?? =2 
3 
34. 
(i) Perimeter of sector =  2?? +
2?????? 360
= 73.12 
                        ? 2(24) +
2×3.14×24×?? 360
= 73.12  
                   ? ?? = 60
°
 
      (ii)Area of minor segment =  (
3.14×24×24×60
360
-
1.73
4
× 24 × 24) ???? 2
 
                                  = (301.44 - 249.12) ???? 2
 
                           = 52.32 ???? 2
  
 
1 
1 
2 
 
1 
 
 
 
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