In a certain code language, ROCKET is written as BNQSDJ. How will NOTICE be written in that language?

SNMDBH

The logic here is;

(the 1st letter interchanged with 3rd, 3rd with 1st, 4th with 6th and 6th with 4th)

So,

R -1  Q

O -1  N

C -1   B

K -1   J

E -1   D

T -1  S

Similarly,

N -1  M

O -1  N

T -1  S

I -1  H

C -1  B

E -1  D

Thus, SNMDBH is correct.