Vacuum tube is the specialty of which generation

In a certain code language: 

- A & B means 'A is the son of B', 

- A + B means 'A is the brother of B', 

Which of the following letter-clusters will replace the question mark (?) in the given series?

FUV, IXW, LAX, ?, RGZ

Select the combination of letters that when sequentially placed in the blanks of the given series will complete the series. 

xy_z_xxy_zbx_yx_bx_y_z_x

Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.

Which of the following terms will replace the question mark (?) in the given series?

NLJ, JHF, FDB, BZX,? 

Select the correct mirror image of the given figure when the mirror is placed at MN as shown below.

Select T the option figure that will replace the question mark (?) in the figure given below to complete the pattern.

Find the odd word/Letter from the given alternatives.