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Recent questions in Class12
Questions
>>
JEEMAIN and NEET
>>
Mathematics
>>
Class12
Class12
Relations and Functions
Inverse Trigonometric Functions
Matrices
Determinants
Continuity and Differentiability
Application of Derivatives
Integral Calculus
Application of Integrals
Differential Equations
Vector Algebra
3-D Geometry
Probability
If
D
=
|
1
1
1
1
1
+
x
1
1
1
1
+
y
|
for
x
≠
0
,
y
≠
0
then
D
is
jeemain
math
class12
ch4
determinants
q45
evaluate-determinants
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
Let
A
=
[
1
2
3
4
]
and
B
=
[
a
0
0
b
]
a
,
b
∈
N
.Then
jeemain
math
class12
ch3
matrices
q44
equality-of-matrices
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If
A
and
B
are square matrices of size
n
×
n
such that
A
2
−
B
2
=
(
A
−
B
)
(
A
+
B
)
then which of the following will be always true?
jeemain
math
class12
ch3
matrices
q43
invertible-matrices
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If
A
2
−
A
+
I
=
0
then the inverse of A is
jeemain
math
class12
ch4
determinants
q42
adjoint-and-inverse
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
Let
A
=
[
1
−
1
1
2
1
−
3
1
1
1
]
and
10
B
=
[
4
2
2
−
5
0
α
1
−
2
3
]
if
B
is the inverse of matrix A then
α
is
jeemain
math
class12
ch4
determinants
q41
adjoint-and-inverse
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
Let
A
=
[
0
0
−
1
0
−
1
0
−
1
0
0
]
.The only correct statement about the matrix A is
jeemain
math
class12
ch4
determinants
q40
adjoint-and-inverse
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If
A
=
[
a
b
b
a
]
and
A
2
=
[
α
β
β
α
]
then
jeemain
math
class12
ch3
matrices
q39
operations-on-matrices
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If
1
,
ω
,
ω
2
are the cube roots of unity ,then
Δ
=
|
1
ω
n
ω
2
n
ω
2
n
1
ω
n
ω
2
n
1
ω
n
|
is equal to
jeemain
math
class12
ch4
determinants
q38
evaluate-determinants
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If the system of linear equations
x
+
2
a
y
+
a
z
=
0
,
x
+
3
b
y
+
b
z
=
0
,
x
+
4
c
y
+
c
z
=
0
has a non-zero solution the a,b,c
jeemain
math
class12
ch4
determinants
q37
system-of-linear equations
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If
a
>
0
and determinant of
a
x
2
+
2
b
x
+
c
is -ve then
|
a
b
a
x
+
b
b
c
b
x
+
c
a
x
+
b
b
x
+
c
0
|
is equal to
jeemain
math
class12
ch4
determinants
q36
evaluate-determinants
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
Let
ω
be a complex cube root of unity with
ω
≠
1
and
p
=
[
P
i
j
]
be a
n
×
n
matrix with
P
i
j
=
ω
i
+
j
.Then
P
2
≠
0
when
n
=
jeemain
math
class12
ch3
matrices
q35
operations-on-matrices
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If the adjoint of a
3
×
3
matrix P is
[
1
4
4
2
1
7
1
1
3
]
then the possible value(s) of the determinant of P is
jeemain
math
class12
ch4
determinants
q34
adjoint-and-inverse
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
Let
M
and
N
be two
3
×
3
non singular skew-symmetric matrices such that
M
N
=
N
M
.If PT denotes the transpose of P,then
M
2
N
2
(
M
T
N
)
−
1
(
M
N
−
1
)
T
is equal to
jeemain
math
class12
ch3
matrices
q33
symmetric-and-skew-symmetric-matrices
easy
asked
Nov 21, 2013
by
sreemathi.v
1
answer
If
→
a
a
n
d
→
b
are two non zero non collinear vectors, then
[
→
a
→
b
ˆ
i
]
ˆ
i
+
[
→
a
→
b
ˆ
j
]
ˆ
j
+
[
→
a
→
b
ˆ
k
]
ˆ
k
=
?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q56
asked
Nov 20, 2013
by
rvidyagovindarajan_1
1
answer
If
→
a
=
ˆ
i
+
ˆ
j
,
→
b
=
2
ˆ
j
−
ˆ
k
and
→
r
×
→
a
=
→
b
×
→
a
,
→
r
×
→
b
=
→
a
×
→
b
then a unit vector in the direction of
→
r
is ?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q55
asked
Nov 20, 2013
by
rvidyagovindarajan_1
1
answer
If
→
a
a
n
d
→
b
are unit non collinear vectors and if
→
u
=
→
a
−
(
→
a
.
→
b
)
→
b
and
→
v
=
→
a
×
→
b
then
|
→
v
|
=
?
jeemain
math
class12
ch10
vector-algebra
difficult
vector-product
q54
asked
Nov 20, 2013
by
rvidyagovindarajan_1
1
answer
If
|
6
i
−
3
i
1
4
3
i
−
1
20
3
i
|
=
x
+
i
y
then
jeemain
math
class12
ch4
determinants
q32
evaluate-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
→
a
=
2
ˆ
i
+
ˆ
j
−
2
ˆ
k
a
n
d
→
b
=
ˆ
i
+
ˆ
j
.
and
→
c
is a vector such that
→
a
.
→
c
=
|
→
c
|
,
|
→
c
−
→
a
|
=
2
√
2
and angle between
→
a
×
→
b
a
n
d
→
c
is
π
6
, then
|
(
→
a
×
→
b
)
×
→
c
|
=
?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q53
asked
Nov 20, 2013
by
rvidyagovindarajan_1
1
answer
The determinant
|
a
b
a
α
+
b
b
c
b
α
+
c
a
α
+
b
b
α
+
c
0
|
is equal to zero if
jeemain
math
ch4
class12
determinants
q31
properties-of-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
P
is a
3
×
3
matrix such that
P
T
=
2
P
+
1
where
P
T
is the transpose of
p
and
I
is the
3
×
3
identity matrix then there exists a column matrix
x
=
[
x
y
z
]
≠
[
0
0
0
]
such that
jeemain
math
ch3
class12
matrices
q30
transpose-of-a-matrix
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Let
P
=
[
a
i
j
]
be a
3
×
3
matrix and let
Q
=
[
b
i
j
]
where
b
i
j
=
2
i
+
j
a
i
j
for
1
≤
i
,
j
≤
3
.If the determinant of P is 2,then the determinant of the matrix
Q
is
jeemain
math
ch4
class12
determinants
q29
evaluate-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Let
ω
≠
1
be a cube root of unity and
S
be the set of all non-singular matrices of the form
|
1
a
b
ω
1
c
ω
2
ω
1
|
where each of a,b and c is either
ω
or
ω
2
.Then the number of distinct matrices in the set S is
jeemain
math
ch3
class12
matrices
q28
invertible-matrices
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
The number of
3
×
3
matrices A whose entries are either 0 or 1 and for which the system
A
=
[
x
y
z
]
=
[
1
0
0
]
has exactly two distinct solution is
jeemain
math
ch3
class12
matrices
q27
invertible-matrices
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Given :
2
x
−
y
+
2
z
=
2
,
x
−
2
y
+
z
=
−
4
,
x
+
y
+
λ
z
=
4
then the value of
λ
such that the given system of equation has No solution is
jeemain
math
ch4
class12
determinants
q26
system-of-linear-equations
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
A
=
|
α
0
1
1
|
and
B
=
|
1
0
5
1
|
then the value of
α
for which
A
2
=
B
is
jeemain
math
ch3
class12
matrices
q25
operations-on-matrices
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Let
ω
=
−
1
2
+
i
√
3
2
.Then the value of the determinant
|
1
1
1
1
−
1
−
ω
2
ω
2
1
ω
2
ω
4
|
is
jeemain
math
ch4
class12
determinants
q24
evaluate-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
f
(
x
)
=
|
1
x
x
+
1
2
x
x
(
x
−
1
)
(
x
+
1
)
x
3
x
(
x
−
1
)
x
(
x
−
1
)
(
x
−
2
)
(
x
+
1
)
x
(
x
−
1
)
|
then
f
(
100
)
is equal to
jeemain
math
ch3
class12
matrices
q23
elementary-operation-(transformation)-of-a-matrix
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If the system of equations
x
+
a
y
=
0
,
a
z
+
y
=
0
and
a
x
+
z
=
0
has infinite solution then the value of a is
jeemain
math
ch4
class12
determinants
q22
system-of-linear-equations
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
A
=
[
α
2
2
α
]
and
∣
A
3
∣=
125
then the value of
α
is
jeemain
math
ch4
class12
determinants
q21
minors-and-cofactors
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
The number of values of k for which the system of equations
(
k
+
1
)
x
+
8
y
=
4
k
,
k
x
+
(
k
+
3
)
y
=
3
k
−
1
has infinitely many solutions is
jeemain
math
ch4
class12
determinants
q20
system-of-linear-equations
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If the system of equations :
x
−
k
y
−
z
=
0
,
k
x
−
y
−
z
=
0
,
x
+
y
−
z
=
0
has a non zero solutions then the possible value of k are
jeemain
math
ch4
class12
determinants
q19
system-of-linear-equations
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
The determinant
|
x
p
+
y
x
y
y
p
+
z
y
z
0
x
p
+
y
y
p
+
z
|
=
0
if
jeemain
math
ch4
class12
determinants
q18
properties-of-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
A
and
B
are square matrices of equal degree,then which one is correct among the following
jeemain
math
ch3
class12
matrices
q17
equality-of-matrices
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
ω
(
≠
1
)
is a cube root of unity,then
|
1
1
+
i
+
ω
2
ω
2
1
−
i
−
1
ω
2
−
1
−
i
−
i
+
ω
−
1
−
1
|
=
jeemain
math
ch3
class12
matrices
q16
elementary-operation-transformation)-of-a-matrix
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Consider the set A of all determinants of order 3 with entries 0 or 1 only.Let B be the subset of A consisting of all determinants with value 1.Let C be the subset of A consisting of all determinants with value -1.Then
jeemain
math
ch4
class12
determinants
q15
properties-of-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
The value of the determinant
|
1
a
a
2
−
b
c
1
b
b
2
−
c
a
1
c
c
2
−
a
b
|
is
jeemain
math
ch4
class12
determinants
q14
evaluate-determinants
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
Given that
x
=
−
9
is a root of
|
x
3
7
2
x
2
7
6
x
|
= 0, the other two roots are
jeemain
math
class12
unit3
matrices
q13
operations-on-matrices
easy
asked
Nov 20, 2013
by
sreemathi.v
1
answer
A determinant is chosen at random from the set of all determinants of order 2 with elements 0 or 1 only. The probability that the value of determinant chosen is +ve is
jeemain
math
class12
ch4
determinants
easy
properties-of-determinants
asked
Nov 20, 2013
by
sreemathi.v
1
answer
If
→
a
,
→
b
,
→
c
are non zero, non collinear vectors such that
→
a
×
→
b
=
→
b
×
→
c
=
→
c
×
→
a
, then
→
a
+
→
b
+
→
c
=
?
jeemain
math
class12
ch10
vector-algebra
difficult
addition-of-vectors
q52
asked
Nov 19, 2013
by
rvidyagovindarajan_1
1
answer
If the magnitude of the vector
a
ˆ
i
+
b
ˆ
j
+
c
ˆ
k
is
|
a
|
+
|
b
|
+
|
c
|
, then
a
,
b
,
c
should be ?
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q51
asked
Nov 19, 2013
by
rvidyagovindarajan_1
1
answer
If
→
a
a
n
d
→
c
are unit and collinear vectors and
|
→
b
|
=
6
, then
→
b
−
3
→
c
=
λ
→
a
,
if
λ
=
?
jeemain
math
class12
ch10
vector-algebra
difficult
scalar-product
q50
asked
Nov 19, 2013
by
rvidyagovindarajan_1
1
answer
If
|
→
a
|
=
|
→
b
|
=
1
and
|
→
a
+
→
b
|
=
√
3
and
→
c
is such that
→
c
−
→
a
−
2
→
b
=
3
(
→
a
×
→
b
)
, then
→
c
.
→
b
=
?
jeemain
math
class12
ch10
vector-algebra
difficult
addition-of-vectors
q49
asked
Nov 19, 2013
by
rvidyagovindarajan_1
1
answer
The solution set of the equation
|
1
4
20
1
−
2
5
1
2
x
5
x
2
|
=
0
is
jeemain
math
class12
ch4
determinants
system-of-linear-equations
easy
asked
Nov 19, 2013
by
sreemathi.v
1
answer
The system of equations
λ
x
+
y
+
z
=
0
,
−
x
+
λ
y
+
z
=
0
,
−
x
−
y
+
λ
z
=
0
will have a non-zero solutions if real values of
λ
are given by
jeemain
class12
math
ch4
determinants
system-of-linear-equations
medium
asked
Nov 19, 2013
by
sreemathi.v
1
answer
If
[
1
−
tan
θ
tan
θ
1
]
[
1
tan
θ
−
tan
θ
1
]
−
1
=
[
a
−
b
b
a
]
then find
a
,
b
jeemain
math
class12
ch3
matrices
operations-on-matrices
medium
asked
Nov 19, 2013
by
sreemathi.v
1
answer
Find the product of the matrices
[
2
3
4
−
1
2
−
5
]
and
[
1
2
3
−
4
−
5
6
]
jeemain
math
class12
ch3
matrices
operations-on-matrices
easy
asked
Nov 19, 2013
by
sreemathi.v
1
answer
Given matrices
A
=
[
5
−
2
0
3
0
5
−
1
0
8
]
,
B
=
[
0
−
2
1
0
0
5
]
, find
(
A
+
B
)
.
jeemain
math
ch3
matrices
operations-on-matrices
easy
class12
asked
Nov 19, 2013
by
sreemathi.v
1
answer
Find the value of
λ
for which the set of equations
x
+
y
−
2
z
=
0
,
2
x
−
3
y
+
z
=
0
,
x
−
5
y
+
4
z
=
λ
are consistent.
jeemain
math
class12
ch4
determinants
system-of-linear-equations
easy
asked
Nov 19, 2013
by
sreemathi.v
1
answer
For what value of
k
do the following homogeneous system of equations posses a non-trivial.
x
+
k
y
+
3
z
=
0
,
3
x
+
k
y
−
2
z
=
0
,
2
x
+
3
y
−
4
z
=
0
jeemain
math
class12
ch4
determinants
system-of-linear-equations
easy
asked
Nov 19, 2013
by
sreemathi.v
1
answer
Evaluate :
|
y
+
z
z
y
z
z
+
x
x
y
x
x
+
y
|
jeemain
math
class12
ch4
determinants
evaluate-determinants
easy
asked
Nov 19, 2013
by
sreemathi.v
1
answer
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