Direction (66-70): What should come in place of the question mark(?) in the following number series?

4, 5, 14, 51, ?

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.

A person’s last performance

In the following question, select the related number from the given alternatives.
50: 65 :: 122 :?

Directions : In these questions , a part of the sentence is given in bold . Below are given alternatives to the bold part at (A) , (B) and (C) which may improve the sentence . Choose the correct alternative . In case no improvement is needed you answer is (D ) .

My uncle is enough rich to buy a car. 

Direction: - In these questions read each sentence to find out whether there is any error in it. the error, if any will be in one part of the sentence. The number of that part is the answer. If there is no error, the answer is (D). (Ignore errors of punctuation, if any.)

Some categorically suspected (A) / having seen the (B) guard and thief together. (C) No error (D) 

Direction: In questions, a sentence has been given in Active/Passive. Out of the four alternatives suggested select the one which best expresses the same sentence in Passive/Active Voice and mark answer in the Answer Sheet.

We waste much time on trifles.