Puzzle Test Questions and Answers

There are seven books one each on Psychology, Hindi, English, Sociology, Economics, Education and Accountancy, lying on a table one above the other.
Sociology is on the top of all the books.
Accountancy is immediately below Education which is immediately below Sociology.
Economics is immediately above Psychology but not in the middle.
Hindi is immediately below Psychology.
Economics is between which of the following books ? 

In a pile of 10 books, there are 3 of History, 3 of Hindi, 2 of Mathematics and 2 of English.
Taking from above, there is an English books between a History and Mathematics book, a History book between a Mathematics and an English book, a Hindi book between an English and A Mathematics book, a Mathematics book between two Hindi books and two Hindi books between a Mathematics and a History book.
Book of which subject is at the sixth position from the top ?

B is twice as old as A but twice younger than F.
C is half the age of A but twice the age of D.
Which two persons from the pair of oldest and youngest ?

(A) Gopal is shorter than Ashok but taller than Kunal;
(B) Navin is shorter than Kunal;
(C) Jayesh is taller than Navin;
(D) Ashok is taller than Jayesh. Which of the given informations is not necessary to answer the above question ?

Seven executives P, Q, R, S, T, U andW reach office in a particular sequence.
U reaches immediately before P but does not immediately follow S. R is the last one to reach office. T follows immediately after P and is subsequently followed by W. Who ranks fourth in the sequence of reaching office ?

Five boys participated in a competition. Rohit was ranked lower than Sanjay. Vikas was ranked higher than Dinesh. Kamal`s rank was between Rohit and Vikas. Who was ranked highest ?

In a shop, the items were arranged in a shelf consisting of six rows.
Biscuits are arranged above the tins of chocolates but below the rows of packets of chips, cakes are at the bottom and the bottles of peppermints are below the chocolates.
The topmost row had the display of jam bottles. Where exactly are the bottles of peppermints ? Mention the place from the top.  

Sitting in a row in front of a camera, Mr. X on the left of the person sitting in the centre but is on the right of Mr. Y.
Mr. P is on the right of Mr. Z and Mr. R is on the right of Mr. P.
Mr. R is the second person from the person sitting in the centre. Who is the person sitting in the centre ? 

(A). P, Q, R, S and T are sitting in a circle facing the centre.
(B). R is immediate left of T.
(C). P is between S and T. 
Who is to the immediate left of R ?

(A). P, Q, R, S and T are sitting in a circle facing the centre.
(B). R is immediate left of T.
(C). P is between S and T. To find the answer to the above question, which of the following statements can be dispensed with ?