Sol : Option 3
The middle letters which are vowels have an increasing trend of A, E, I, O, U and remaining letters have been retained as it is.So answer would be JUF.

Q.2. _ xx _ yx _ yy _ xy _ xxy

1. xxxyy

2. yxyxy

3. yyxxy

4. yyyxx

Sol : Option 3
The series is yxxy/yxxy/yxxy/yxxy. Thus, the pattern 'yxxy' is repeated.

Q.3. WXCD, UVEF, STGH, QRIJ, ?

1. OPKL

2. AYBZ

3. JIRQ

4. LRMS

Sol : Option 1
Start reading from CD, EF, GH, IJ, KL and then QR, ST, UV, WX, YZ and so on after splitting the groups.

Q.4. xy _ z _ xxyx _ px _ yxzpx _ yxzpx

1. xpzxx

2. yxyzx

3. yxzpx

4. zyxpy

Sol : Option 1
The series is xyxzpx/xyxzpx/xyxzpx/xyxzpx. Thus, the pattern ' xyxzpx' is repeated.

Q.5. WYB, XUD, YQF, ...

1. HZM

2. HCZ

3. ZMH

4. None of these

Sol : Option 3
Divide each member of series in this way: B D F H and so on (one gap) in ascending order, Y U Q M and so on (three gap) in descending order, WX Y Z and so on (no gap) in ascending order

Sol : Option 4
The series is xypzy/ xypzy/ xypzy. Thus, the pattern ' xypzy' is repeated.

Q.7. SAB, ?, QCD, PDD, OEF, NFF

1. CBT

2. ABR

3. BCT

4. RBB

Sol : Option 4
First letter in every group is in reverse alphabetical order i.e. SRQPON. The middle letter is in alphabetical order i.e ABCDEF and the last letter has pairs, BB, DD & FF.

Q8. _ x _ y _ xyxx _ yxy _ xyyx

1. xxxyy

2. xyxyy

3. yxyxy

4. yxyyx

Sol : Option 4
The series is yxx/yyx/ yxx/yyx/ yxx/yyx. Thus, the pattern yxx/yyx is repeated.

Q9.BAZ, DBY, FCX, ?

1. FXW

2. EFX

3. FEY

4. HDW

Sol : Option 4
The third, sixth and ninth letters are in the reverse order of the alphabet i.e.Z,Y, X, W. Ist fourth and seventh letters are going up with a gap of one letter and II, V and VIIIth are moved ahead one letter.

Q. 10 _ yz _ zx _ xyx _ z _ zxzxy

1. xyzyy

2. yyyzz

3. yxzyx

4. xyyzz

Sol : Option 1
The series is xyz/yzx/zxy /xyz/yzx/zxy . So, the letters change places in a cyclic manner.