MCQ
Set $\{x: x \in N, x$ is prime, $3 < x < 5\}$ is :
- A$\{4\}$
- B$\{3,5\}$
- ✓$\{\}$
- DNon-empty
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$1.$ Length of chord $P Q$ is
$(A)$ $7 a$ $(B)$ $5 a$ $(C)$ $2 a$ $(D)$ $3 a$
$2.$ If chord $PQ$ subtends an angle $\theta$ at the vertex of $y^2=4 a x$, then $\tan \theta=$
$(A)$ $\frac{2}{3} \sqrt{7}$ $(B)$ $\frac{-2}{3} \sqrt{7}$ $(C)$ $\frac{2}{3} \sqrt{5}$ $(D)$ $\frac{-2}{3} \sqrt{5}$
Give the answer question $1$ and $2.$