1
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What is the adjoint of the matrix $$\left( {\matrix{
{\cos ( - \theta )} & { - \sin ( - \theta )} \cr
{ - \sin ( - \theta )} & {\cos ( - \theta )} \cr
} } \right)$$ ?
2
NDA 2018 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
What should be the value of x, so that the matrix $$\left( {\matrix{
2 & 4 \cr
{ - 8} & x \cr
} } \right)$$ does not have an inverse?
3
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
If $$A = \left( {\matrix{
1 & 2 \cr
2 & 3 \cr
} } \right)$$ and $${A^2} - kA - {I_2} = O$$, where I2 is the 2 $$\times$$ 2 identity matrix, then what is the value of k?
4
NDA 2018 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
What is the inverse of the matrix $$A = \left( {\matrix{
{\cos \theta } & {\sin \theta } & 0 \cr
{ - \sin \theta } & {\cos \theta } & 0 \cr
0 & 0 & 1 \cr
} } \right)$$ ?
Questions Asked from Matrices (Marks 2.5)
Number in Brackets after Paper Indicates No. of Questions
NDA Subjects
Mathematics
Algebra
Sets, Relations and Functions Logarithms Quadratic Equations and Inequalities Sequence And Series Binomial Theorem Matrices Determinants Permutations and Combinations Probability Complex Numbers Vector Algebra Three Dimensional Geometry Statistics
Trigonometry
Trigonometric Angles and Equations Inverse Trigonometric Function Height and Distance Properties of Triangles
Coordinate Geometry
Calculus
English
General Studies