1.  Which number can replace both the question marks in the equation 412? = ?32.


1
7
712
None of these


Answer

 Option

Let 412x = x32. Then, x2 = 32 * 92 = 144. x = 144 = 12.

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2.  What number should be divided by 0.25 to give the result as 25 ?


12.5
25
50
125


Answer

 Option

Let the required number be x. Then x0.25 = 25. x0.5 = 25. x = 25 * 0.5 = 125.

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3.  What is the square root of 0.16 ?


0.004
0.04
0.4
4


Answer

 Option

0.16 = 16100 = 16100 = 410 = 0.4.

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4.  Three-fifth of the square of a certain number is 126.15. What is the number ?


14.5
75.69
145
210.25


Answer

 Option

Let the number be x. Then 35 x2 = 126.15. x2 = (126.15 * 53) = 210.25. x = 210.25 = 14.5

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5.  The value of 0.01 + 0.81 + 0.21 + 0.0009


2.03
2.1
2.11
2.13


Answer

 Option

1100 + 81100 + 121100 = 910000 = 110 + 910 + 1110 + 3100. = 0.1 + 0.9 + 1.1 + 0.03 = 2.13.

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