If 5=10, 6=18, 7=28 then 8=?

If a mirror is placed on the line MN, then which of the answer figure is the right image of the given figure?

Complete the following series.
AZBY, CXDW, EVFU, ?

In each of the following question , find the missing letters from the given response.
HIIJ, IJJK, JKKL,  KLLM,  LMMN, ?

In each of the following questions, select the related letter/word/ figure/ number from the given alternatives.
Ramanujan: Mathematician:: Sushruta:?

In the question given below , two statements are given followed by four Conclusion I, II, III and IV.You have to consider the two statements to be true even if they seem to be at variance from commonly known facts .You have to decide which of the given conclusion , if any , follow from the given statements. 

Statements
All goats are tigers.
All tigers are lions.
Conclusions :
I. All tigers are goats
II. All lions are tigers
III. No goat is a lion
IV. No lion is a goat 

In each of the following questions, select the related letter/word/ figure/ number from the given alternatives.
Tree : Forest : : Grass : ?

In each of the following questions, select the related letter/word/ figure/ number from the given alternatives.
Democracy : India : : Communism : ?