Square Roots and Cube Roots Questions

Q:

The cube root of .000216 is:

A) .6 B) .06
C) 77 D) 87
 
Answer & Explanation Answer: B) .06

Explanation:

.00021613=21610613=6*6*6102*102*10213=6102=0.06

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62 14432
Q:

If 0.00000676=0.0026 then 6760000 is:

A) 2.6 B) 26
C) 260 D) 2600
 
Answer & Explanation Answer: D) 2600

Explanation:

6760000=0.00000676×102= 0.00000676 ×102 = 0.0026×106 = 2600

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36 6029
Q:

What should come in place of both the question marks in the equation

?128=162?

 

 

 

A) 12 B) 14
C) 144 D) 196
 
Answer & Explanation Answer: A) 12

Explanation:

Let x128=162x

 

Then, x2=128×162 =64×2×18×9=82×62×32 = 8×6×3 =144

 

x=12

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19 5960
Q:

The value of  10+25+108+154+225is:

A) 4 B) 6
C) 8 D) 10
 
Answer & Explanation Answer: A) 4

Explanation:

10+25+108+154+22510+25+108+154+1510+25+108+1310+25+1110+616=4

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23 5577
Q:

If (89)2 is added to the square of a number, the answer so obtained is 16202. What is the (1/26) of that number?

A) 5.65 B) 2.7
C) 3.5 D) 6.66
 
Answer & Explanation Answer: C) 3.5

Explanation:

Let the number is = x

(89)2 + x2 = 16202

x2 = 8281

x = 91

=> (1/26) of 91 = 3.5

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16 5198
Q:

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 & Explanation Answer: C) 77

Explanation:

Money collected = (59.29 x 100) paise = 5929 paise.

 

  Number of members = 5929 = 77.

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24 4900
Q:

If 35+125=17.88, then what will be the value of 80+65 =?

A) 13.41 B) 20.46
C) 21.66 D) 22.35
 
Answer & Explanation Answer: D) 22.35

Explanation:

35+125=17.88 35+55=17.88

5=2.235

 

80+65=45+65=105=10×2.235=22.35

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11 4804
Q:

If 18225=135, then the value of 182.25 +1.8225+0.018225+0.00018225  is:

A) 1.49985 B) 14.9985
C) 149.985 D) 1499.85
 
Answer & Explanation Answer: B) 14.9985

Explanation:

Given exp = 18225102+18225104+18225106+18225108

 

               = 1822510+18225102+18225103+18225104

 

               = 13510+135100+1351000+13510000

 

               = 13.5+1.35+0.135+0.0135=14.9985

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22 4528