Verbal Reasoning - Mental Ability Questions

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

Choose the alternative that will continue the same pattern and replace 'x' 33,40,37,44,x

-20 , -16 , -12 , -8 .... 

In the sequence above, each term after the first is 4 greater than the preceding term. Which of the following could not be a term in the sequence? 

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

Choose the correct alternative that will continue the same pattern and replace 'x' in series 6,18,42,78,x

There is a certain relation between two given words on one side of : : and one word is given on another side of : : while another word is to be found from the given alternatives, having the same relation with this word as the given pair has. Select the best alternative Aeroplane:Cockpit::Train:?

Virus doubles every 3 mins. It is 'K' in 1 hour, when was it K/4 ?

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 ?