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Square and Cube Roots Aptitude Objective Questions and Answers

1

0.0169 x B = 1.3.

What is the value of B?

A. 100
B. 10
C. 1000
D. None of These
See Answer & Explanation Lets Discuss
Correct answer is : A
Explanation

0.0169 x B = 1.3

=> 0.0169 x B = 1.32

=> 0.0169 x B = 1.69

=> B= 1.69/0.0169 = 100 

 
2

What is the cube root of .000216 ?

A. 0.6
B. 0.06
C. 77
D. 87
See Answer & Explanation Lets Discuss
Correct answer is : B
Explanation

( 0.000216) 1/3 

= (216/106)1/3

= [ (6 x 6 x 6)/ (102 x 102 x 102 ) ]1/3

=6/102

=.06

 
3

If 3√5 + √125 = 17.88, then what is the value of √80 + 6√5 ?

A. 22.35
B. 13.41
C. 20.46
D. 21.66
See Answer & Explanation Lets Discuss
Correct answer is : A
Explanation

 3√5 + √125 = 17.88

=> 3√5 + √25 x 5 = 17.88

=> 3√5 + 5√5 = 17.88

=> 8√5 = 17.88

=> 5 = 2.235

=> √80 + 6√5 = √16 x 5 + 6√5

=> 4√5 + 6√5

=> 10√5 = (10 x 2.235) = 22.35

 
4

If a = 0.1039, then what is the value of √4a2 - 4a + 1 + 3a ?

A. 1.1039
B. .1039
C. .2078
D. 2.1039
See Answer & Explanation Lets Discuss
Correct answer is : A
Explanation

4a2 - 4a + 1 + 3a =√ (1)2 + (2a)2 - 2 x 1 x 2a + 3a

   = √(1 - 2a)2 + 3a

   = (1 - 2a) + 3a

   = (1 + a)

   = (1 + 0.1039)

   = 1.1039

 
5

The square root of (7 +3√ 5) (7 - 3√5) is

A.

 5

B.

2

C.

4

D.

3√5

See Answer & Explanation Lets Discuss
Correct answer is : B
Explanation (7 + 35)(7 - 35)=√(7)2 - (35)2  = √49 - 45  = √ = 2.
 
 

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Square and Cube Roots Aptitude Objective Questions and Answers with Explanation

Square and Cube Roots Aptitude Objective Questions and Answers for Government Sector job preparation. Square and Cube Roots Aptitude Multiple Choice Questions are very important for exams like CAT,MAT,XAT, SSC IBPS, Bank PO, BPSC, UPSC, Govt Jobs, Bank Clerk , UPPSC etc.

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