New chat PYQ Library Doubts Rank report

Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →

Vectors and Matrices question

2015 · Q9

Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.

PYQ Library
IIT JAM
Chemistry
Vectors and Matrices
2015 · Q9

Vectors and Matrices question

2015 · Q9

IIT JAMChemistryVectors and MatricesMCQ+1 / −0.33

Which one of the following is an identity matrix?

A
$\begin{pmatrix} 0 & 0 \\ 0 & 0 \end{pmatrix}$
B
$\begin{pmatrix} 1 & 0 \\ 0 & 1 \end{pmatrix}$
C
$\begin{pmatrix} 0 & 1 \\ 1 & 0 \end{pmatrix}$
D
$\begin{pmatrix} 1 & 1 \\ 1 & 1 \end{pmatrix}$

View written solutionFree

Correct answer: B

More from Vectors and Matrices

Consider $C = A \times B$ , where $A = 3 \hat{i} - 2 \hat{j} + 5 \hat{k}$ and $B$ , a unit vector in $x y$ -plane, makes an angle of $3 7^{\circ}$ with the $x$ -axis. Projection of $C$ on the $x$ -axis is …2025 · Numerical
Consider the following matrices A and B. $A = 1300024000005000006800079 and B = 101200011130000040000015170001618$ …2025 · Numerical
For three non-coplanar vectors **a**, **b** and **c**, the expression **a** · (**b** × **c**) can be written as2019 · MCQ
A vector $A = i + x j + 3 k$ is rotated through an angle and is also doubled in magnitude resulting in $B = 4 i + (4 x - 2) j + 2 k$ . An acceptable value of $x$ is2018 · MCQ