a2zinterviews

11.	If x * y = x + y + √xy , then the value of 6*24 is
	A.  41
	B.  42
	C.  43
	D.  44

Solution

6 * 24 = 6 + 24 + √6 × 24 ‹=› 30 + √144 ‹=› 30 + 12 ‹=› 42.

12.	A group of students decided to collect as many paise from each member of the group as is the number of members. If the total collection amounts to Rs.59.29, the number of members in the group is
	A.  57
	B.  67
	C.  77
	D.  87

Solution

Money collected = (59.29 x 100 )paise = 5929 paise. Number of members √5929 = 77.

13.	If √5 = 2.236, then the value of 1 / √5 is
	A.  .367
	B.  .447
	C.  .745
	D.  None of these

Solution

1 / √5 = 1 / √5 × √5 / √5 ‹=› √5 / 5 ‹=› 2.236 / 5 = 0.447

14.	(√ 625 / 11 ×14 ×√25 ×11 / √196 ) is equal to
	A.  5
	B.  6
	C.  8
	D.  11

Solution

Given exp. = (25 / 11 ×14 / 5 ×11 / 14) = 5.

15.	Which one of the following numbers has rational square root?
	A.  0.4
	B.  0.09
	C.  0.9
	D.  0.025

Solution

√0.09 = √9 / 100 = 3 / 10 = 0.3, which is rational.