In how many different ways can the letters of the word 'NATIONAL' be arranged?

Preventive detention means- 

Which of the phrase (A), (B), (C), and (D) given below should replace the phrase given in the following sentence grammatically meaningful and correct? If the sentence is correct as it is and ‘No correction is required’, mark (E) as the answer.
Though every one was tired, Rahul was hell bend on playing another game.

Which number replace the question mark?

In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'

Nobody can deny (a)/ that Gandhi’s ideas (b)/ are different than (c)/ Lenin’s. (d)/ No error (e)

Find compound interest on Rs. 50000 at 12 % per annum for 6 months, compounded quarterly. 

In the adjoining figure ∠AOC=140° where O is the centre of the circle then ∠ ABC is equal to:

How many pair of letters are there in the word “EFFECTIVE” which has as many letters (in both forward and backward direction) in between as they have in English alphabet series?