Square and Cube Root- Aptitude Questions and Answers - in Hindi

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The cube root of 5.832 is ?


5.832 की घन रूट है?

A)
0.18

B)
0.28

C)
2.8

D)
1.8


Correct Answer :

1.8


Explanation :

3√5.832 = 3√(5832/1000) =3√5832 / 3√1000 = 18/10 =1.8

The difference of squares of two consecutive odd numbers is always ?


दो क्रमागत विषम संख्याओं के वर्गों का अंतर हमेशा होता है?

A)
divisible by 8

B)
divisible by 2

C)
divisible by 16

D)
divisible by 18


Correct Answer :

divisible by 8


Explanation :

Let two odd numbers be (2x + 1) and (2x + 3)
Difference between the squares= (2x + 3)2 - (2x + 1)2
= (4x2 + 12x + 9) - (4x2 + 4x + 1)
= 8x+8
= 8(x+1) which is always divisible by 8

Find the value of the following √156.25 + √0.0081 - √0.0361 ?


निम्नलिखित का मान ज्ञात कीजिए। √156.25 + √0.0081 - √0.0361 ?

A)
13.4

B)
15.4

C)
12.4

D)
17.4


Correct Answer :

12.4


Explanation :

√156.25 + √0.0081 - √0.0361
=12.5+0.09-0.19
=12.4

Find the value of √ (0.25 * 2.25) ?


√(0.25*2.25) का मान ज्ञात कीजिए?

A)
0.075

B)
0.705

C)
0.75

D)
7.500


Correct Answer :

0.75


Explanation :

√ (0.25 * 2.25)
=0.5*1.5
=0.75

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


(0.324*0.081*4.624)/(1.5625*0.0289*72.9*64) का वर्गमूल है?

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 ?


√64 - √36 , किसके बराबर है?

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?


6440 छात्रों को एक पूर्ण वर्ग बनाने के लिए पंक्तियों में खड़े होने के लिए कहा गया । यह पाया गया कि पूर्ण वर्ग बनने के बाद 40 छात्रों ओर बचे। तो प्रत्येक पंक्ति में छात्रों की संख्या क्या होगी?

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?


√ { ( 0.064 * 6.25 ) / ( 0.081 * 4.84 ) } किसके बराबर है?

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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