1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $$A = \left[ {\matrix{
1 & 0 & { - 2} \cr
2 & { - 3} & 4 \cr
} } \right]$$, then the matrix X for which 2X + 3A = 0 holds true is
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $$A = \left[ {\matrix{
1 & 1 & { - 1} \cr
2 & { - 3} & 4 \cr
3 & { - 2} & 3 \cr
} } \right]$$ and $$B = \left[ {\matrix{
{ - 1} & { - 2} & { - 1} \cr
6 & {12} & 6 \cr
5 & {10} & 5 \cr
} } \right]$$, then which of the following is/are correct?
1. A and B commute.
2. AB is a null matrix.
Select the correct answer using the codes given below.
1. A and B commute.
2. AB is a null matrix.
Select the correct answer using the codes given below.
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following matrices is an elementary matrix?
4
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If $$A = \left[ {\matrix{
2 & 7 \cr
1 & 5 \cr
} } \right]$$, then what is $$A + 3{A^{ - 1}}$$ equal to?
where, I is the identity matrix of order 2.
where, I is the identity matrix of order 2.
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