If $1$ is the solution of a quadratic equation $3x^{2}-kx+2=0$,then $k=\ldots$

If $81$ is the discriminant of $2x^{2} + 5x - k = 0$,then the value of $k$ is ..............

Had Ajita scored $10$ more marks in her mathematics test out of $30$ marks,$9$ times these marks would have been the square of her actual marks. How many marks did she get in the test?

If one of the roots of $2x^{2}-5x+k=0$ is $\frac{7}{2}$,then $k=$ .............

Every quadratic polynomial has at the most ......... zero/s.

$16x^2 + 40x + k$ is a perfect square polynomial,then $k = \ldots$