Verbal Reasoning - Mental Ability Questions

If x = √8 - √7, y = √6 - √5 and z = √10 - 3, which of the following is true  ?

In the following question, a matrix of certain characters is given.These characters follow a certain trend, row-wise or column wise.Find out this trend and choose the missing character accordingly.

Rajitha has a calculator, which has 10 digits. She want to clean the calculator by removing all the keys and while reassembling it, she interchanged the locations of 3 pairs of keys. For example, if she placed the key ‘3’ in the place of the key ‘7’, she placed the key ‘7’ only in the place of the key ‘3’ and not any other key. All keys that were interchanged corresponded only to numbers. Later, she input some calculations and obtained outputs as provided in the table below. The input is shown in terms of the keys that Kavitapressed, while the output is the output displayed by the calculator.

Output:

1.   95 + 84=128
2.   128 + 64=195
3.   912 + 43=942
4.   178 + 19=192

Question :

Which of the following pair of digits is unchanged ?

Choose the pair in which the words are differently related.

If it is possible to make a meaningful word with the second, the seventh, the ninth, the tenth and the thirteenth letters of the word PROCRASTINATED which of the following will be the third letter of that word? If no such word can be formed give 'X' as the answer, if two or three words can be formed give 'Y' as the answer, and if more than three such words can be formed give 'Z' as the answer.

L is the daughter of K's brother's wife's father-in-law's daughter. K is L's __

I, J , K and L are all distinct individual. I is the daughter of J. J is the son of K and 'K' is the father of L. If B is the son of J and B has one brother, 'D'. Then which of the following statements is/ are true ?

I. I is the sister of D.

II. D and B are brother.

III. K is the grand father of D.

On the eve of Christmas, all the things are kept in apple-pie order.