If a=i+j+2 k, then the value of a a will be - Vidyadip

MCQ

If $\vec{a}=\hat{i}+\hat{j}+2 \hat{k}$, then the value of $\vec{a} \cdot \vec{a}$ will be

A
4
B
6
C
0
D
$\sqrt{6}$

✓

Answer

self

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 [ Question Bank ]→[ Question Bank ] — all question types→Maths STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

An anti-aircraft gun take a maximum of four shots at an enemy plane moving away from it. The probability of hitting the plane at the first, second, third and fourth shot are $0.4, 0.3, 0.2$ and $0.1$ respectively. The probability that the gun hits the plane is

Write the cofactor of the element $a_{31}$ in
$
A=\left(\begin{array}{lll}
3 & 2 & 6 \\
5 & 0 & 7 \\
3 & 8 & 5
\end{array}\right).
$

4 white and 3 black balls are in a bag. 3 white and 4 black balls are in other bag. If a ball is drawn, that is black then find the probability of ball is black drawn from second bag.

If $\cot ^{-1}(\alpha)=\cot ^{-1} 2+\cot ^{-1} 8+\cot ^{-1} 18$ $+\cot ^{-1} 32+\ldots . .$ upto $100$ terms, then $\alpha$ is

Objective function of a LPP is:

The corner points of the feasible region determined by the system of linear constraints are (0, 10),(5, 5),(15, 15),(0, 20). Let z = px + qy where p, q > 0. Condition on p and q so that the maximum of z occurs at both the points (15, 15) and (0, 20) is __________:

Let $A$ be a square matrix all of whose entries are integers. Then which one of the following is true $?$

The value of $\cot \left( {\sum\limits_{r = 1}^\infty {{{\tan }^{ - 1}}\left( {\frac{4}{{4{r^2} + 3}}} \right)} } \right)$ is equal to

The interval on which the function $f(x)=2 x^3+9 x^2+12 x-1$ is decreasing is

Choose the correct answer
If a, b, c, are in A.P, then the determinant:
$\begin{vmatrix}\text{x}+2&\text{x}+3&\text{x}+2\text{a}\\\text{x}+3&\text{x}+4&\text{x}+2\text{b}\\\text{x}+4&\text{x}+5&\text{x}+2\text{c}\end{vmatrix}$ is

0
1
x
2x