Verbal Reasoning - Mental Ability Questions

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

K_L_K_LN_M_N

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

SUN, TWQ, UYT, VAW, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.

VXK, QSF, LNA, GIV, ?

If 4 + 3 = 25 and 8 + 4 = 80 , then, 3 + 2 = ?

If A denotes '+', B denotes '-', C denotes '/', D denotes 'x' then the value of the expression 9 D 48 C 6 B 16 A 3 is

Samarth heading towards north turns right after walking 10m, he turns right again walks for 4 meters and then he turns left and walks 6 km. In which direction he is walking?

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
U, T, R, O, K ?

The weights of 4 boxes are 20, 40, 50 and 30 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?