If the equation x² + 5kx + 16 = 0 has no real roots, then :

1. k > $\dfrac{8}{5}$

2. k < $-\dfrac{8}{5}$

3. $-\dfrac{8}{5} \lt k \lt \dfrac{8}{5}$

4. none of these

The discriminant of the equation, 3x² - 2x + $\dfrac{1}{3}$ = 0 is :

1. 0

2. 1

3. 2

4. 4

The nature of the roots of the equation, 3x² - $4\sqrt{3}x$ + 4 = 0 is:

1. real and equal

2. irrational and unequal

3. rational and unequal

4. imaginary and unequal

The value of the discriminant of the equation 2x² - 3x + 5 = 0, is:

1. 31

2. $\sqrt{-31}$

3. $\sqrt{31}$

4. -31