MCQ
The direction cosine of $y$-axis is:
  • A
    $0,0,0$
  • B
    $1,0,0$
  • $0,1,0$
  • D
    $0,0,1$.

Answer

Correct option: C.
$0,1,0$
(C) $0,1,0$

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

Similar questions

If $\theta$ is the angle between two vectors $\vec{\text{a}}$ and $\vec{\text{b}},$ then $\vec{\text{a}}.\vec{\text{b}}\geq0$ only when:
  1. $0<\theta\frac{\pi}{2}$
  2. $0\leq\theta\leq\frac{\pi}{2}$
  3. $0<\theta<\pi$
  4. $0\leq\theta\leq\pi$
Order of the differential equation of the family of all concentric circles centered at $(h, k)$ is
If $A = \left[ {\begin{array}{*{20}{c}}
{ - 4}&{ - 1}\\
3&1
\end{array}} \right]$ , then the determinant of the matrix $\left( {{A^{2016}} - 2{A^{2015}} - {A^{2014}}} \right)$ is
Choose the correct answer from the given four options.
In a college, 30% students fail in physics, 25% fail in mathematics and 10% fail in both. One student is chosen at random. The probability that she fails in physics if she has failed in mathematics is:
  1. $\frac{1}{10}$
  2. $\frac{2}{5}$
  3. $\frac{9}{20}$
  4. $\frac{1}{3}$
The value of $\lambda $ for which points $A(2,2,1)$ , $B(1,1,1)$ , $C(-\lambda ,2,1)$ and $D(3,0,-1)$ are coplanar, is $\lambda  =$  ............ 
If $f (x) = \frac{{{{\log }_{\sin |x|}}{{\cos }^3}x}}{{{{\log }_{\sin |3x|}}{{\cos }^3}\left( {\frac{x}{2}} \right)}}for |x| <\frac{\pi }{3} x \ne 0= 4$ for $x = 0$then, the number of points of discontinuity of f in $\left( { - \frac{\pi }{3},\,\frac{\pi }{3}} \right)$ is
Given that $\int\limits^{\infty}_0\frac{\text{x}^2}{(\text{x}^2+\text{a}^2)(\text{x}^2+\text{b}^2)(\text{x}^2+\text{c}^2)}\text{ dx}=\frac{\pi}{2(\text{a}+\text{b})(\text{b}+\text{c})(\text{c}+\text{a})},$ the value of $\int\limits^\infty_0\frac{1}{(\text{x}^2+4)(\text{x}^2+9)},$ is:

  1. $\frac{\pi}{60}$

  2. $\frac{\pi}{20}$

  3. $\frac{\pi}{40}$

  4. $\frac{\pi}{80}$

Choose the correct answer from the given four options.
The probability distribution of a discrete random variable X is given below:
$\text{X}$
$2$
$3$
$4$
$5$
$\text{P}(\text{X})$
$\frac{5}{\text{k}}$
$\frac{7}{\text{k}}$
$\frac{9}{\text{k}}$
$\frac{11}{\text{k}}$
The value of k is:
  1. 8.
  2. 16.
  3. 32.
  4. 48.
The region represented by the inequation system x, y ≥ 0, y ≤ 6, x + y ≤ 3 is:
  1. unbounded in first quadrant
  2. unbounded in first and second quadrants
  3. bounded in first quadrant
  4. none of these
Let $S=\{1,2,3,4,5,6,7\} .$ Then the number of possible functions $f: S \rightarrow S$ such that $f(m \cdot n)=f(m) \cdot f(n)$ for every $m, n \in S$ and $m . n \in S$ is equal to $......$