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 Page 1


  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
CBSE Board 
Class XI Mathematics 
Sample Paper – 4 Solution 
 
SECTION – A 
 
1. Such a function is called the greatest integer function. 
         From the definition [x] = –1 for –1 = x < 0 
           [x] = 0 for 0 = x < 1 
          [x] = 1 for 1 = x < 2 
          [x] = 2 for 2 = x < 3 and so on. 
 
2. 4x + i(3x – y) = 3 + i(–6) 
Equating real and the imaginary parts of the given equation, we get, 
4x = 3, 3x – y = – 6,  
Solving simultaneously, we get x =
3
4
and y = 
33
4
 
 
3. Given A = {1, 2} and B = {3, 4} A × B = {(1, 3), (1, 4), (2, 3), (2, 4)}. 
Since n(A × B) = 4, the number of subsets of A × B is 2
4
. 
Therefore, the number of relations from A to B will be 16. 
OR 
(x + 3, 5) = (6, 2x + y) 
x + 3 = 6  
x = 3                …….(i) 
Also, 
2x + y = 5 
6 + y = 5          from (i) 
y = -1 
 
4. The negation of the given statement : 
It is false that Australia is a continent. 
Or 
Australia is not a continent. 
 
 
 
 
 
 
 
 
 
Page 2


  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
CBSE Board 
Class XI Mathematics 
Sample Paper – 4 Solution 
 
SECTION – A 
 
1. Such a function is called the greatest integer function. 
         From the definition [x] = –1 for –1 = x < 0 
           [x] = 0 for 0 = x < 1 
          [x] = 1 for 1 = x < 2 
          [x] = 2 for 2 = x < 3 and so on. 
 
2. 4x + i(3x – y) = 3 + i(–6) 
Equating real and the imaginary parts of the given equation, we get, 
4x = 3, 3x – y = – 6,  
Solving simultaneously, we get x =
3
4
and y = 
33
4
 
 
3. Given A = {1, 2} and B = {3, 4} A × B = {(1, 3), (1, 4), (2, 3), (2, 4)}. 
Since n(A × B) = 4, the number of subsets of A × B is 2
4
. 
Therefore, the number of relations from A to B will be 16. 
OR 
(x + 3, 5) = (6, 2x + y) 
x + 3 = 6  
x = 3                …….(i) 
Also, 
2x + y = 5 
6 + y = 5          from (i) 
y = -1 
 
4. The negation of the given statement : 
It is false that Australia is a continent. 
Or 
Australia is not a continent. 
 
 
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
SECTION – B 
 
 
5. Given 
2
2
2
()
1
22
(2)
2 1 5
2
2 10
5
( (2))
5 29
2
1
5
x
fx
x
f
f f f
?
?
? ? ?
?
??
? ? ? ?
??
??
??
?
??
??
  
OR 
f(x) = 3x
4
 – 5x
2
 + 9  
f(x – 1) = 3(x – 1)
4
 – 5(x – 1)
2
 + 9  
f(x – 1) = 3(x
4
 – 4x
3
 + 6x
2
 – 4x + 1) – 5(x
2
 – 2x + 1) + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 18x
2
 – 12x + 3 – 5x
2
 + 10x – 5 + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 13x
2
 – 2x + 7 
 
  
6.   
? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ?
? ? ? ? ?
? ? ? ? ? ?
?
? ? ? ? ? ? ?
?
? ? ? ? ? ? ? ? ? ? ?
3
33
3
2
2
2
given that cos3 8cos 0
4cos 3cos 8cos 0
12cos 3cos 0
3cos (4cos 1) 0
cos 0 or (4cos 1) 0
cos 0 ............. (2n 1) ,n I
2
1
(4cos 1) 0..............cos ....... n ,n I
23
 
 
7.  Discriminant of given equation is 0…….real and equal 
? ? ? ? ? ?
? ? ? ?
? ? ?
?
2 2 2 2 2
4 2 2 2
22
0 ( 2b(a c)) 4(a b )(b c )
0 4( b a c 2b ac)
0 4(b ac)
b ac
hence they are in GP
 
 
 
 
 
 
 
Page 3


  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
CBSE Board 
Class XI Mathematics 
Sample Paper – 4 Solution 
 
SECTION – A 
 
1. Such a function is called the greatest integer function. 
         From the definition [x] = –1 for –1 = x < 0 
           [x] = 0 for 0 = x < 1 
          [x] = 1 for 1 = x < 2 
          [x] = 2 for 2 = x < 3 and so on. 
 
2. 4x + i(3x – y) = 3 + i(–6) 
Equating real and the imaginary parts of the given equation, we get, 
4x = 3, 3x – y = – 6,  
Solving simultaneously, we get x =
3
4
and y = 
33
4
 
 
3. Given A = {1, 2} and B = {3, 4} A × B = {(1, 3), (1, 4), (2, 3), (2, 4)}. 
Since n(A × B) = 4, the number of subsets of A × B is 2
4
. 
Therefore, the number of relations from A to B will be 16. 
OR 
(x + 3, 5) = (6, 2x + y) 
x + 3 = 6  
x = 3                …….(i) 
Also, 
2x + y = 5 
6 + y = 5          from (i) 
y = -1 
 
4. The negation of the given statement : 
It is false that Australia is a continent. 
Or 
Australia is not a continent. 
 
 
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
SECTION – B 
 
 
5. Given 
2
2
2
()
1
22
(2)
2 1 5
2
2 10
5
( (2))
5 29
2
1
5
x
fx
x
f
f f f
?
?
? ? ?
?
??
? ? ? ?
??
??
??
?
??
??
  
OR 
f(x) = 3x
4
 – 5x
2
 + 9  
f(x – 1) = 3(x – 1)
4
 – 5(x – 1)
2
 + 9  
f(x – 1) = 3(x
4
 – 4x
3
 + 6x
2
 – 4x + 1) – 5(x
2
 – 2x + 1) + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 18x
2
 – 12x + 3 – 5x
2
 + 10x – 5 + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 13x
2
 – 2x + 7 
 
  
6.   
? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ?
? ? ? ? ?
? ? ? ? ? ?
?
? ? ? ? ? ? ?
?
? ? ? ? ? ? ? ? ? ? ?
3
33
3
2
2
2
given that cos3 8cos 0
4cos 3cos 8cos 0
12cos 3cos 0
3cos (4cos 1) 0
cos 0 or (4cos 1) 0
cos 0 ............. (2n 1) ,n I
2
1
(4cos 1) 0..............cos ....... n ,n I
23
 
 
7.  Discriminant of given equation is 0…….real and equal 
? ? ? ? ? ?
? ? ? ?
? ? ?
?
2 2 2 2 2
4 2 2 2
22
0 ( 2b(a c)) 4(a b )(b c )
0 4( b a c 2b ac)
0 4(b ac)
b ac
hence they are in GP
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
8. Graph of function |x + 2| - 1  
 
x 0 -2 -1 1 2 
f(x) 1 -1 0 2 3 
 
 
 
 
9. Since the denominator of x
2
 is greater than the denominator of y
2
, the major axis is     
along the x-axis. Comparing the given equation with the standard equation of the 
ellipse 
 
22
22
xy
1
ab
??
 
a = 5, b =3 
? ? ? ? ?
22
ae a b 25 9 4 
So the foci are (4, 0) and (-4, 0) 
OR 
Let the equation of ellipse be 
22
22
xy
1
ab
?? and e be the eccentricity. 
Given that 
Latus rectum = (minor axis)/2 
2
22
2b 1
2b
a2
2b a
4b a
??
?
?
 
? ?
2 2 2
2
4a 1 e a
4 4e 1
??
??
 
2
33
ee
42
? ? ? 
Page 4


  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
CBSE Board 
Class XI Mathematics 
Sample Paper – 4 Solution 
 
SECTION – A 
 
1. Such a function is called the greatest integer function. 
         From the definition [x] = –1 for –1 = x < 0 
           [x] = 0 for 0 = x < 1 
          [x] = 1 for 1 = x < 2 
          [x] = 2 for 2 = x < 3 and so on. 
 
2. 4x + i(3x – y) = 3 + i(–6) 
Equating real and the imaginary parts of the given equation, we get, 
4x = 3, 3x – y = – 6,  
Solving simultaneously, we get x =
3
4
and y = 
33
4
 
 
3. Given A = {1, 2} and B = {3, 4} A × B = {(1, 3), (1, 4), (2, 3), (2, 4)}. 
Since n(A × B) = 4, the number of subsets of A × B is 2
4
. 
Therefore, the number of relations from A to B will be 16. 
OR 
(x + 3, 5) = (6, 2x + y) 
x + 3 = 6  
x = 3                …….(i) 
Also, 
2x + y = 5 
6 + y = 5          from (i) 
y = -1 
 
4. The negation of the given statement : 
It is false that Australia is a continent. 
Or 
Australia is not a continent. 
 
 
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
SECTION – B 
 
 
5. Given 
2
2
2
()
1
22
(2)
2 1 5
2
2 10
5
( (2))
5 29
2
1
5
x
fx
x
f
f f f
?
?
? ? ?
?
??
? ? ? ?
??
??
??
?
??
??
  
OR 
f(x) = 3x
4
 – 5x
2
 + 9  
f(x – 1) = 3(x – 1)
4
 – 5(x – 1)
2
 + 9  
f(x – 1) = 3(x
4
 – 4x
3
 + 6x
2
 – 4x + 1) – 5(x
2
 – 2x + 1) + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 18x
2
 – 12x + 3 – 5x
2
 + 10x – 5 + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 13x
2
 – 2x + 7 
 
  
6.   
? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ?
? ? ? ? ?
? ? ? ? ? ?
?
? ? ? ? ? ? ?
?
? ? ? ? ? ? ? ? ? ? ?
3
33
3
2
2
2
given that cos3 8cos 0
4cos 3cos 8cos 0
12cos 3cos 0
3cos (4cos 1) 0
cos 0 or (4cos 1) 0
cos 0 ............. (2n 1) ,n I
2
1
(4cos 1) 0..............cos ....... n ,n I
23
 
 
7.  Discriminant of given equation is 0…….real and equal 
? ? ? ? ? ?
? ? ? ?
? ? ?
?
2 2 2 2 2
4 2 2 2
22
0 ( 2b(a c)) 4(a b )(b c )
0 4( b a c 2b ac)
0 4(b ac)
b ac
hence they are in GP
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
8. Graph of function |x + 2| - 1  
 
x 0 -2 -1 1 2 
f(x) 1 -1 0 2 3 
 
 
 
 
9. Since the denominator of x
2
 is greater than the denominator of y
2
, the major axis is     
along the x-axis. Comparing the given equation with the standard equation of the 
ellipse 
 
22
22
xy
1
ab
??
 
a = 5, b =3 
? ? ? ? ?
22
ae a b 25 9 4 
So the foci are (4, 0) and (-4, 0) 
OR 
Let the equation of ellipse be 
22
22
xy
1
ab
?? and e be the eccentricity. 
Given that 
Latus rectum = (minor axis)/2 
2
22
2b 1
2b
a2
2b a
4b a
??
?
?
 
? ?
2 2 2
2
4a 1 e a
4 4e 1
??
??
 
2
33
ee
42
? ? ? 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
 
10. Let T represent the students who drink tea and C represents students who drink 
coffee and x represent the number of students who drink tea or coffee.  
So, x = n(T ? C) 
 
n(T) = 150; n(C) = 225  
n (T ?C) = n(T)+ n(C) - n(T ?C)  
Substituting the values,  
x = 150 + 225 – 100 = 275 
Number of students who drink neither tea nor coffee   
= 600 – 275 = 325.  
OR 
Let H denote the set of people speaking Hindi and E denote the set of people 
speaking English. 
n(H) = 550, n(E) = 450 and n(H ? E) = 800 
n(H n E) = n(H) + n(E) – n(H ? E) 
                  = 550 + 450 – 800  
                  = 200 
Hence, 200 persons can speak both Hindi and English. 
 
11.  R: { (a, b): a, b ? A, a divides b}, Also 
A = {l, 2, 3, 4, 6} 
(i) R = {(1, 1), (1, 2), (1, 3), (1, 4),(1, 6), (2, 2),(2, 4), (2,6), (3, 3), (3, 6),(4, 4), (6, 6)}  
(ii) Domain of R = {1, 2, 3, 4, 6} 
(iii) Range of R = {1, 2, 3, 4, 6} 
 
 
 
 
 
 
 
 
Page 5


  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
CBSE Board 
Class XI Mathematics 
Sample Paper – 4 Solution 
 
SECTION – A 
 
1. Such a function is called the greatest integer function. 
         From the definition [x] = –1 for –1 = x < 0 
           [x] = 0 for 0 = x < 1 
          [x] = 1 for 1 = x < 2 
          [x] = 2 for 2 = x < 3 and so on. 
 
2. 4x + i(3x – y) = 3 + i(–6) 
Equating real and the imaginary parts of the given equation, we get, 
4x = 3, 3x – y = – 6,  
Solving simultaneously, we get x =
3
4
and y = 
33
4
 
 
3. Given A = {1, 2} and B = {3, 4} A × B = {(1, 3), (1, 4), (2, 3), (2, 4)}. 
Since n(A × B) = 4, the number of subsets of A × B is 2
4
. 
Therefore, the number of relations from A to B will be 16. 
OR 
(x + 3, 5) = (6, 2x + y) 
x + 3 = 6  
x = 3                …….(i) 
Also, 
2x + y = 5 
6 + y = 5          from (i) 
y = -1 
 
4. The negation of the given statement : 
It is false that Australia is a continent. 
Or 
Australia is not a continent. 
 
 
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
SECTION – B 
 
 
5. Given 
2
2
2
()
1
22
(2)
2 1 5
2
2 10
5
( (2))
5 29
2
1
5
x
fx
x
f
f f f
?
?
? ? ?
?
??
? ? ? ?
??
??
??
?
??
??
  
OR 
f(x) = 3x
4
 – 5x
2
 + 9  
f(x – 1) = 3(x – 1)
4
 – 5(x – 1)
2
 + 9  
f(x – 1) = 3(x
4
 – 4x
3
 + 6x
2
 – 4x + 1) – 5(x
2
 – 2x + 1) + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 18x
2
 – 12x + 3 – 5x
2
 + 10x – 5 + 9 
f(x – 1) = 3x
4
 – 12x
3
 + 13x
2
 – 2x + 7 
 
  
6.   
? ? ? ?
? ? ? ? ? ? ?
? ? ? ? ?
? ? ? ? ?
? ? ? ? ? ?
?
? ? ? ? ? ? ?
?
? ? ? ? ? ? ? ? ? ? ?
3
33
3
2
2
2
given that cos3 8cos 0
4cos 3cos 8cos 0
12cos 3cos 0
3cos (4cos 1) 0
cos 0 or (4cos 1) 0
cos 0 ............. (2n 1) ,n I
2
1
(4cos 1) 0..............cos ....... n ,n I
23
 
 
7.  Discriminant of given equation is 0…….real and equal 
? ? ? ? ? ?
? ? ? ?
? ? ?
?
2 2 2 2 2
4 2 2 2
22
0 ( 2b(a c)) 4(a b )(b c )
0 4( b a c 2b ac)
0 4(b ac)
b ac
hence they are in GP
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
8. Graph of function |x + 2| - 1  
 
x 0 -2 -1 1 2 
f(x) 1 -1 0 2 3 
 
 
 
 
9. Since the denominator of x
2
 is greater than the denominator of y
2
, the major axis is     
along the x-axis. Comparing the given equation with the standard equation of the 
ellipse 
 
22
22
xy
1
ab
??
 
a = 5, b =3 
? ? ? ? ?
22
ae a b 25 9 4 
So the foci are (4, 0) and (-4, 0) 
OR 
Let the equation of ellipse be 
22
22
xy
1
ab
?? and e be the eccentricity. 
Given that 
Latus rectum = (minor axis)/2 
2
22
2b 1
2b
a2
2b a
4b a
??
?
?
 
? ?
2 2 2
2
4a 1 e a
4 4e 1
??
??
 
2
33
ee
42
? ? ? 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
 
10. Let T represent the students who drink tea and C represents students who drink 
coffee and x represent the number of students who drink tea or coffee.  
So, x = n(T ? C) 
 
n(T) = 150; n(C) = 225  
n (T ?C) = n(T)+ n(C) - n(T ?C)  
Substituting the values,  
x = 150 + 225 – 100 = 275 
Number of students who drink neither tea nor coffee   
= 600 – 275 = 325.  
OR 
Let H denote the set of people speaking Hindi and E denote the set of people 
speaking English. 
n(H) = 550, n(E) = 450 and n(H ? E) = 800 
n(H n E) = n(H) + n(E) – n(H ? E) 
                  = 550 + 450 – 800  
                  = 200 
Hence, 200 persons can speak both Hindi and English. 
 
11.  R: { (a, b): a, b ? A, a divides b}, Also 
A = {l, 2, 3, 4, 6} 
(i) R = {(1, 1), (1, 2), (1, 3), (1, 4),(1, 6), (2, 2),(2, 4), (2,6), (3, 3), (3, 6),(4, 4), (6, 6)}  
(ii) Domain of R = {1, 2, 3, 4, 6} 
(iii) Range of R = {1, 2, 3, 4, 6} 
 
 
 
 
 
 
 
 
  
 
CBSE XI | Mathematics 
Sample Paper – 4 Solution 
 
     
12.  Given Signum function: 
 
The two branches 
 Bold bullet at (0, 0)  
Circle at (0, 1) and (0, -1) 
 
SECTION – C 
 
13.  Let 1 = rcos?, v3 = rsin? 
By squaring and adding, we get, 
r²(cos²? + sin²?) = 4, ? r = 2 
, So 
3
13
cos , sin
22
?
?? ? ? ? ?
 
Therefore, required polar form is 
z 2 cos isin
33
?? ??
??
??
??
 
OR 
        
? ? ? ?
2
18
25
22
4 4 2 2
4 6 1
2
2
2
2
2
1
i
i
11
ii
i
i
1
1
i
11
1 2 1
ii
1 2 1 2
11
i 1 i
i
2 2i
2i 0 2i
ii
??
??
??
?
??
??
? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ?
??
? ? ?
??
??
? ? ? ?
? ? ? ? ?
? ? ? ?
? ? ? ?
? ? ? ? ? ?
?
?
? ? ? ? ?
 
 
 
 
 
 
 
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FAQs on Sample Solution Paper 4 - Math, Class 11 - Mathematics (Maths) Class 11 - Commerce

1. What is the quadratic formula?
Ans. The quadratic formula is a formula used to calculate the solutions of a quadratic equation. It is given by: x = (-b ± √(b^2 - 4ac))/(2a) where a, b, and c are the coefficients of the quadratic equation ax^2 + bx + c = 0.
2. How do I solve a quadratic equation using the quadratic formula?
Ans. To solve a quadratic equation using the quadratic formula, follow these steps: 1. Identify the coefficients a, b, and c of the quadratic equation ax^2 + bx + c = 0. 2. Substitute the values of a, b, and c into the quadratic formula: x = (-b ± √(b^2 - 4ac))/(2a). 3. Simplify and calculate the values of x using the formula. 4. The solutions will be the values of x obtained from the formula.
3. Can the quadratic formula be used for any quadratic equation?
Ans. Yes, the quadratic formula can be used to solve any quadratic equation of the form ax^2 + bx + c = 0, where a, b, and c are real numbers and a ≠ 0. It provides the exact solutions for the equation, regardless of the values of the coefficients.
4. Are there any alternative methods to solve quadratic equations?
Ans. Yes, there are alternative methods to solve quadratic equations, such as factoring, completing the square, and graphing. These methods can be used when the quadratic equation is in a different form or when it is easier to use a specific method based on the given equation.
5. What are the discriminant and its significance in the quadratic formula?
Ans. The discriminant is a term in the quadratic formula given by b^2 - 4ac. It determines the nature and number of solutions of a quadratic equation. 1. If the discriminant is positive (b^2 - 4ac > 0), the quadratic equation has two distinct real solutions. 2. If the discriminant is zero (b^2 - 4ac = 0), the quadratic equation has one real solution (a repeated root). 3. If the discriminant is negative (b^2 - 4ac < 0), the quadratic equation has no real solutions (complex roots).
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