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Aptitude Square root and Cube root Question and Answer

1)The least perfect square, which is divisible by each of 21, 36 and 66 is:
A. 213444
B. 214344
C. 214434
D. 231444

Answer:A. 213444

Explanation: L.C.M. of 21, 36, 66 = 2772.
Now, 2772 = 2 x 2 x 3 x 3 x 7 x 11
To make it a perfect square, it must be multiplied by 7 x 11.
So, required number = 22 x 32 x 72 x 112 = 213444

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

Answer:C. 77

Explanation: collection = (59.29 x 100) = 5929
members = √5929 = 77.

3) √0.0169 x ? = 1.3
A. 10
B. 100
C. 1000
D. None of these

Answer:B. 100

Explanation: Let √0.0169 x x = 1.3.
Then, 0.0169x = (1.3)2 = 1.69

=>x =
1.69 / 0.0169
= 100

4) What is the square root of √6084
A) 75
B) 77
C) 78
D) 68

Answer:C) 78

Explanation:

5)The cube root of 33132651
A) 40
B) 45
C) 51
D) 48

Answer:C) 51

Explanation:

6) Find the value of√151
A) 12.459
B) 12.292
C) 13.591
D) None of these

Answer:B) 12.292

Explanation:






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