Square and Cube Root- Aptitude Questions and Answers

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(0.324 * 0.081 * 4.624) / (1.5625 * 0.0289 * 72.9 * 64) is the square root of ?

A)
24

B)
2.4

C)
0.024

D)
1.2


Correct Answer :

0.024


Explanation :

(0.324 * 0.081 * 4.624) / (1.5625 * 0.0289 * 72.9 * 64)
=(324 * 81 * 4624) / (1.625 * 289 * 729 * 64)
=9/15625

hence,the square root is √(9/15625)
=3/125
=0.024


√64 - √36, is equal to ?

A)
-2

B)
2

C)
1

D)
0


Correct Answer :

2


Explanation :

√64 - √36 = 8- 6 = 2

6440 students were asked to stand in rows to form a perfect square. It was found that 40 students were left out. What will be the number of students in each row?

A)
40

B)
80

C)
64

D)
60


Correct Answer :

80


Explanation :

Remaining students = 6440- 40 = 6400
So, students in each row = √6400 = 80

What is √ { ( 0.064 * 6.25 ) / ( 0.081 * 4.84 ) } equal to?

A)

10/99


B)

100/99


C)

9


D)

99



Correct Answer :

100/99


Explanation :

√{ ( 0.064 * 6.25 )/( 0.081 * 4.84 ) }
= √ {(64 * 625 )/( 81 * 484 ) }
= (8 * 25)/( 9* 22)
= 200/198
= 100/99

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