If =4 and .b =2 then a ^2 b ^2 is equal to: - Vidyadip

MCQ

If $\mid\text{a}\times\text{b}\mid=4$ and $\mid\text{a.b}\mid=2$ then $\mid{\text{a}}\mid^2\mid{\text{b}}\mid^2$ is equal to:

A
$4$
B
$6$
✓
$20$
D
$2$

✓

Answer

Correct option: C.

$20$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from Vector Algebra→Vector Algebra — all question types→Maths STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

$\int_{}^{} {{{\cos }^3}{\kern 1pt} x\;{e^{\log (\sin x)}}} \;dx$ is equal to

For the system of linear equations :

$x-2 y=1, x-y+k z=-2, k y+4 z=6, k \in R$

consider the following statements :

$(A)$ The system has unique solution if $k \neq 2$, $k \neq-2$

$(B)$ The system has unique solution if $k =-2$.

$(C)$ The system has unique solution if $k =2$.

$(D)$ The system has no-solution if $k =2$.

$(E)$ The system has infinite number of solutions if $k \neq-2$

Which of the following statements are correct?

If the matrix $A=\left[\begin{array}{ccc}1 & 0 & 0 \\ 0 & 2 & 0 \\ 3 & 0 & -1\end{array}\right]$ satisfies the equation $A ^{20}+\alpha A ^{19}+\beta A =\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & 4 & 0 \\ 0 & 0 & 1\end{array}\right]$ for some real numbers $\alpha$ and $\beta$, then $\beta-\alpha$ is equal to ........ .

A normal to the plane x = 2 is:

$\int {\sqrt {\frac{{1 + x}}{{1 - x}}} \,\,dx = } $

If $\left| {\,\begin{array}{*{20}{c}}{{{(b + c)}^2}}&{{a^2}}&{{a^2}}\\{{b^2}}&{{{(c + a)}^2}}&{{b^2}}\\{{c^2}}&{{c^2}}&{{{(a + b)}^2}}\end{array}\,} \right| = k\,abc{(a + b + c)^3}$, then the value of $k$ is

If $\smallint \frac{{5\tan x}}{{\tan x - 2\;}}dx$$ = x + aln\left| {\sin x - 2\cos x} \right| + k$ then $a $ is equal to

The objective function $Z = 4x + 3y$ can be maximised subjected to the constraints $ 3\text{x}+4\text{y}\leq24,$ $8\text{x}+6\text{y}\leq48,$ $\text{x}\leq5,\text{y}\leq6;\text{x},\text{y}\leq0.$

${d \over {dx}}(\log \tan x) = $

Let $A = \{x : -1 \leq x \leq 1\}$ and $f : A \rightarrow A$ is a function defined by $f(x) = x |x|$ then $f$ is: