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# CBSE Past Year Paper Session (2015), Math Class 12 JEE Notes | EduRev

## JEE : CBSE Past Year Paper Session (2015), Math Class 12 JEE Notes | EduRev

Page 1

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

CBSE Board
Class XII Mathematics
Board Paper – 2015
All India
Time: 3 hrs  Total Marks: 100

General Instructions:
1. All questions are compulsory.
2. Please check that this question paper contains 26 questions.
3. Question 1 – 6 in Section A are very short – answer type questions carrying 1 mark
each.
4. Questions 7 – 19 in Section B are long – answer I type question carrying 4 marks each.
5. Questions 20 – 26 in Section B are long – answer II type question carrying 6 marks
each.
6. Please write down the serial number of the question before attempting it.

SECTION – A
Question numbers 1 to 6 carry 1 mark each.

1. ? ? ? ? ? ? ? If a 2i j 3k and b 3i 5j 2k,thenfind a b .
2. Find the angle between the vectors  ?? i jand j k.

3. Find the distance of a point (2, 5, -3) from the plane
? ?
? ? ? r. 6i 3j 2k 4.

4. Write the element a 12 of the matrix A = [a ij] 2 × 2, whose elements a ij are given by a ij = e
2ix

sin jx.

5. Find the differential equation of the family of lines passing through the origin.

6. Find the integrating factor for the following differential equation: ??
dy
x log x y 2log x
dx

Page 2

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

CBSE Board
Class XII Mathematics
Board Paper – 2015
All India
Time: 3 hrs  Total Marks: 100

General Instructions:
1. All questions are compulsory.
2. Please check that this question paper contains 26 questions.
3. Question 1 – 6 in Section A are very short – answer type questions carrying 1 mark
each.
4. Questions 7 – 19 in Section B are long – answer I type question carrying 4 marks each.
5. Questions 20 – 26 in Section B are long – answer II type question carrying 6 marks
each.
6. Please write down the serial number of the question before attempting it.

SECTION – A
Question numbers 1 to 6 carry 1 mark each.

1. ? ? ? ? ? ? ? If a 2i j 3k and b 3i 5j 2k,thenfind a b .
2. Find the angle between the vectors  ?? i jand j k.

3. Find the distance of a point (2, 5, -3) from the plane
? ?
? ? ? r. 6i 3j 2k 4.

4. Write the element a 12 of the matrix A = [a ij] 2 × 2, whose elements a ij are given by a ij = e
2ix

sin jx.

5. Find the differential equation of the family of lines passing through the origin.

6. Find the integrating factor for the following differential equation: ??
dy
x log x y 2log x
dx

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

SECTION – B

Question numbers 7 to 19 carry 4 marks each.

7. If
1 2 2
A 2 1 2 ,
2 2 1
then show that A
2
– 4A – 5I = O, and hence find A
-1

OR
If
2 0 1
A 5 1 0 ,
0 1 3

then find A
-1
using elementary row operations.

8. Using the properties of determinants, solve the following for x:

x 2 x 6 x 1
x 6 x 1 x 2 0
x 1 x 2 x 6

9. Evaluate:
2
/2
0
sin x
dx
sinx cosx
.
OR
Evaluate
2
3x
1
e 7x 5 dx  as a limit of sums.

10. Evaluate:

2
42
x
dx
x x 2

11.In a set of 10 coins, 2 coins are with heads on both the sides. A coin is selected at
random from this set and tossed five times. If all the five times, the result was heads,
find the probability that the selected coin had heads on both the sides.

OR
How many times must a fair coin be tossed so that the probability of getting at least one

12. Find x such that the four points A(4, 1, 2), B(5, x, 6) , C(5, 1, -1) and D(7, 4, 0) are
coplanar.

Page 3

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

CBSE Board
Class XII Mathematics
Board Paper – 2015
All India
Time: 3 hrs  Total Marks: 100

General Instructions:
1. All questions are compulsory.
2. Please check that this question paper contains 26 questions.
3. Question 1 – 6 in Section A are very short – answer type questions carrying 1 mark
each.
4. Questions 7 – 19 in Section B are long – answer I type question carrying 4 marks each.
5. Questions 20 – 26 in Section B are long – answer II type question carrying 6 marks
each.
6. Please write down the serial number of the question before attempting it.

SECTION – A
Question numbers 1 to 6 carry 1 mark each.

1. ? ? ? ? ? ? ? If a 2i j 3k and b 3i 5j 2k,thenfind a b .
2. Find the angle between the vectors  ?? i jand j k.

3. Find the distance of a point (2, 5, -3) from the plane
? ?
? ? ? r. 6i 3j 2k 4.

4. Write the element a 12 of the matrix A = [a ij] 2 × 2, whose elements a ij are given by a ij = e
2ix

sin jx.

5. Find the differential equation of the family of lines passing through the origin.

6. Find the integrating factor for the following differential equation: ??
dy
x log x y 2log x
dx

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

SECTION – B

Question numbers 7 to 19 carry 4 marks each.

7. If
1 2 2
A 2 1 2 ,
2 2 1
then show that A
2
– 4A – 5I = O, and hence find A
-1

OR
If
2 0 1
A 5 1 0 ,
0 1 3

then find A
-1
using elementary row operations.

8. Using the properties of determinants, solve the following for x:

x 2 x 6 x 1
x 6 x 1 x 2 0
x 1 x 2 x 6

9. Evaluate:
2
/2
0
sin x
dx
sinx cosx
.
OR
Evaluate
2
3x
1
e 7x 5 dx  as a limit of sums.

10. Evaluate:

2
42
x
dx
x x 2

11.In a set of 10 coins, 2 coins are with heads on both the sides. A coin is selected at
random from this set and tossed five times. If all the five times, the result was heads,
find the probability that the selected coin had heads on both the sides.

OR
How many times must a fair coin be tossed so that the probability of getting at least one

12. Find x such that the four points A(4, 1, 2), B(5, x, 6) , C(5, 1, -1) and D(7, 4, 0) are
coplanar.

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

13. A line passing through the point A with position vector a 4i 2j 2k is parallel to the
vector b 2i 3j 6k . Find the length of the perpendicular drawn on this line from a
point P with vector
1
r i 2j 3k .

14. Solve the following for x:
sin
-1
(1 - x) – 2 sin
-1
x =
?
2

OR
Show that:

11
3 17
2sin tan
5 31 4

15. If y = e
ax
. cos bx, then prove that

2
22
2
d y dy
2a a b y 0
dx
dx

16. If x
x
+ x
y
+ y
x
= a
b
, then find
dy
.
dx

17. If x = a sin 2t (1 + cos 2t) and y = b cos 2t (1 – cos 2t) then find
dy
dx
at t.
4

18. Evaluate:
? ?
? ?
?
?
?
x
3
x 3 e
dx
x5

19.  Three schools X, Y, and Z organized a fete (mela)  for collecting funds for flood victims
in which they sold hand-helds fans, mats and toys made from recycled material, the sale
price of each being Rs. 25, Rs. 100 andRs. 50 respectively. The following table shows the
number of articles of each type sold:

School SchoolX SchoolY SchoolZ
Article
Hand - held fans 30 40 35
Mats 12 15 20
Toys 70 55 75

Using matrices, find the funds collected by each school by selling the above articles and
the total funds collected. Also write any one value generated by the above situation.
Page 4

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

CBSE Board
Class XII Mathematics
Board Paper – 2015
All India
Time: 3 hrs  Total Marks: 100

General Instructions:
1. All questions are compulsory.
2. Please check that this question paper contains 26 questions.
3. Question 1 – 6 in Section A are very short – answer type questions carrying 1 mark
each.
4. Questions 7 – 19 in Section B are long – answer I type question carrying 4 marks each.
5. Questions 20 – 26 in Section B are long – answer II type question carrying 6 marks
each.
6. Please write down the serial number of the question before attempting it.

SECTION – A
Question numbers 1 to 6 carry 1 mark each.

1. ? ? ? ? ? ? ? If a 2i j 3k and b 3i 5j 2k,thenfind a b .
2. Find the angle between the vectors  ?? i jand j k.

3. Find the distance of a point (2, 5, -3) from the plane
? ?
? ? ? r. 6i 3j 2k 4.

4. Write the element a 12 of the matrix A = [a ij] 2 × 2, whose elements a ij are given by a ij = e
2ix

sin jx.

5. Find the differential equation of the family of lines passing through the origin.

6. Find the integrating factor for the following differential equation: ??
dy
x log x y 2log x
dx

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

SECTION – B

Question numbers 7 to 19 carry 4 marks each.

7. If
1 2 2
A 2 1 2 ,
2 2 1
then show that A
2
– 4A – 5I = O, and hence find A
-1

OR
If
2 0 1
A 5 1 0 ,
0 1 3

then find A
-1
using elementary row operations.

8. Using the properties of determinants, solve the following for x:

x 2 x 6 x 1
x 6 x 1 x 2 0
x 1 x 2 x 6

9. Evaluate:
2
/2
0
sin x
dx
sinx cosx
.
OR
Evaluate
2
3x
1
e 7x 5 dx  as a limit of sums.

10. Evaluate:

2
42
x
dx
x x 2

11.In a set of 10 coins, 2 coins are with heads on both the sides. A coin is selected at
random from this set and tossed five times. If all the five times, the result was heads,
find the probability that the selected coin had heads on both the sides.

OR
How many times must a fair coin be tossed so that the probability of getting at least one

12. Find x such that the four points A(4, 1, 2), B(5, x, 6) , C(5, 1, -1) and D(7, 4, 0) are
coplanar.

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

13. A line passing through the point A with position vector a 4i 2j 2k is parallel to the
vector b 2i 3j 6k . Find the length of the perpendicular drawn on this line from a
point P with vector
1
r i 2j 3k .

14. Solve the following for x:
sin
-1
(1 - x) – 2 sin
-1
x =
?
2

OR
Show that:

11
3 17
2sin tan
5 31 4

15. If y = e
ax
. cos bx, then prove that

2
22
2
d y dy
2a a b y 0
dx
dx

16. If x
x
+ x
y
+ y
x
= a
b
, then find
dy
.
dx

17. If x = a sin 2t (1 + cos 2t) and y = b cos 2t (1 – cos 2t) then find
dy
dx
at t.
4

18. Evaluate:
? ?
? ?
?
?
?
x
3
x 3 e
dx
x5

19.  Three schools X, Y, and Z organized a fete (mela)  for collecting funds for flood victims
in which they sold hand-helds fans, mats and toys made from recycled material, the sale
price of each being Rs. 25, Rs. 100 andRs. 50 respectively. The following table shows the
number of articles of each type sold:

School SchoolX SchoolY SchoolZ
Article
Hand - held fans 30 40 35
Mats 12 15 20
Toys 70 55 75

Using matrices, find the funds collected by each school by selling the above articles and
the total funds collected. Also write any one value generated by the above situation.

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

SECTION – C

Question numbers 20 to 26 carry 6 marks each.

20.  Let A = Q × Q, where Q is the set of all rational numbers, and * be a binary opearation
on A defined by (a, b) * (c, d) = (ac, b + ad) for (a. b), (c, d) ? A. Then find
(i) The identify element of * in A.
(ii) Invertible elements of A, and hence write the inverse of elements (5, 3) and
??
??
??
1
,4
2
.
OR
Let f : W ? W be defined as
n 1, if n is odd
f n
n 1, if n is even
Show that f is invertible and find the inverse of f. Here, W is the set of all whole
numbers.

21. Sketch the region bounded by the curves  ??
2
y 5 x and ?? y x 1 and find its area
using intergration  .

22. Find the particular solution of the differential equation x
2
dy = (2xy + y
2
) dx, given that y
= 1 when x = 1.

OR
Find the particular solution of the differential equation
? ?
?
??
? ? ?
??
??
1
2 m tan x
dy
1 x e y ,
dx

given that y =1 when x = 0.

23. Find the absolute maximum and absolute minimum values of the function f given by f(x)
= sin
2
x – cos x, x ? (0, p)

24. Show that lines:
? ?
? ?
r i j k i j k
r 4j 2 k 2j j 3k are coplanar.
? ? ? ? ? ? ?
? ? ? ? ? ?

Also, find the equation of the plane containing these lines.

Page 5

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

CBSE Board
Class XII Mathematics
Board Paper – 2015
All India
Time: 3 hrs  Total Marks: 100

General Instructions:
1. All questions are compulsory.
2. Please check that this question paper contains 26 questions.
3. Question 1 – 6 in Section A are very short – answer type questions carrying 1 mark
each.
4. Questions 7 – 19 in Section B are long – answer I type question carrying 4 marks each.
5. Questions 20 – 26 in Section B are long – answer II type question carrying 6 marks
each.
6. Please write down the serial number of the question before attempting it.

SECTION – A
Question numbers 1 to 6 carry 1 mark each.

1. ? ? ? ? ? ? ? If a 2i j 3k and b 3i 5j 2k,thenfind a b .
2. Find the angle between the vectors  ?? i jand j k.

3. Find the distance of a point (2, 5, -3) from the plane
? ?
? ? ? r. 6i 3j 2k 4.

4. Write the element a 12 of the matrix A = [a ij] 2 × 2, whose elements a ij are given by a ij = e
2ix

sin jx.

5. Find the differential equation of the family of lines passing through the origin.

6. Find the integrating factor for the following differential equation: ??
dy
x log x y 2log x
dx

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

SECTION – B

Question numbers 7 to 19 carry 4 marks each.

7. If
1 2 2
A 2 1 2 ,
2 2 1
then show that A
2
– 4A – 5I = O, and hence find A
-1

OR
If
2 0 1
A 5 1 0 ,
0 1 3

then find A
-1
using elementary row operations.

8. Using the properties of determinants, solve the following for x:

x 2 x 6 x 1
x 6 x 1 x 2 0
x 1 x 2 x 6

9. Evaluate:
2
/2
0
sin x
dx
sinx cosx
.
OR
Evaluate
2
3x
1
e 7x 5 dx  as a limit of sums.

10. Evaluate:

2
42
x
dx
x x 2

11.In a set of 10 coins, 2 coins are with heads on both the sides. A coin is selected at
random from this set and tossed five times. If all the five times, the result was heads,
find the probability that the selected coin had heads on both the sides.

OR
How many times must a fair coin be tossed so that the probability of getting at least one

12. Find x such that the four points A(4, 1, 2), B(5, x, 6) , C(5, 1, -1) and D(7, 4, 0) are
coplanar.

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

13. A line passing through the point A with position vector a 4i 2j 2k is parallel to the
vector b 2i 3j 6k . Find the length of the perpendicular drawn on this line from a
point P with vector
1
r i 2j 3k .

14. Solve the following for x:
sin
-1
(1 - x) – 2 sin
-1
x =
?
2

OR
Show that:

11
3 17
2sin tan
5 31 4

15. If y = e
ax
. cos bx, then prove that

2
22
2
d y dy
2a a b y 0
dx
dx

16. If x
x
+ x
y
+ y
x
= a
b
, then find
dy
.
dx

17. If x = a sin 2t (1 + cos 2t) and y = b cos 2t (1 – cos 2t) then find
dy
dx
at t.
4

18. Evaluate:
? ?
? ?
?
?
?
x
3
x 3 e
dx
x5

19.  Three schools X, Y, and Z organized a fete (mela)  for collecting funds for flood victims
in which they sold hand-helds fans, mats and toys made from recycled material, the sale
price of each being Rs. 25, Rs. 100 andRs. 50 respectively. The following table shows the
number of articles of each type sold:

School SchoolX SchoolY SchoolZ
Article
Hand - held fans 30 40 35
Mats 12 15 20
Toys 70 55 75

Using matrices, find the funds collected by each school by selling the above articles and
the total funds collected. Also write any one value generated by the above situation.

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

SECTION – C

Question numbers 20 to 26 carry 6 marks each.

20.  Let A = Q × Q, where Q is the set of all rational numbers, and * be a binary opearation
on A defined by (a, b) * (c, d) = (ac, b + ad) for (a. b), (c, d) ? A. Then find
(i) The identify element of * in A.
(ii) Invertible elements of A, and hence write the inverse of elements (5, 3) and
??
??
??
1
,4
2
.
OR
Let f : W ? W be defined as
n 1, if n is odd
f n
n 1, if n is even
Show that f is invertible and find the inverse of f. Here, W is the set of all whole
numbers.

21. Sketch the region bounded by the curves  ??
2
y 5 x and ?? y x 1 and find its area
using intergration  .

22. Find the particular solution of the differential equation x
2
dy = (2xy + y
2
) dx, given that y
= 1 when x = 1.

OR
Find the particular solution of the differential equation
? ?
?
??
? ? ?
??
??
1
2 m tan x
dy
1 x e y ,
dx

given that y =1 when x = 0.

23. Find the absolute maximum and absolute minimum values of the function f given by f(x)
= sin
2
x – cos x, x ? (0, p)

24. Show that lines:
? ?
? ?
r i j k i j k
r 4j 2 k 2j j 3k are coplanar.
? ? ? ? ? ? ?
? ? ? ? ? ?

Also, find the equation of the plane containing these lines.

CBSE XII | Mathematics
Board Paper 2015 – All India Set – 1

25. Minimum and maximum z = 5x + 2y subject to the following constraints:
x – 2y = 2
3x + 2y = 12
-3x + 2y = 3
x = 0, y = 0

26. Two the numbers are selected at random (without replacement) from first six positive
integers. Let X denote the larger of the two numbers obtained. Find the probability
distribution of X. Find the mean and variance of this distribution.
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## Mathematics (Maths) Class 12

209 videos|236 docs|124 tests

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