1.  If .00000676 = .0026, the square root of 67,60,000 is :


126
26
260
2600


Answer

 Option

6760000 = 0.00000676 * 1012 = 0.00000676 * 1012 = .0026 * 106 = 2600.

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2.  0.3610.00169 = ?


1.913
1913
1.9130
19013


Answer

 Option

0.3610.00169 = 0.361000.00169 = 36100169 = 19013

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3.  If (x - 1) (y + 2) = 7, x and y being positive whole numbers, then the values of x and y respectively are :


8, 5
15, 12
22, 19
None of these


Answer

 Option

(x - 1) (y + 2) = 7. (x -1) (y + 2) = (7)2. (x -1) = 7 and (y + 2) = 7. x = 8 and y = 5.

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4.  If 3n = 729, then the value of n is :


6
8
10
12


Answer

 Option

3n = 729 = 36. (3n)2 = (36)2. 3n = 3. n = 12.

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5.  If 52x = 169289, the value of x is :


52
58
62
68


Answer

 Option

52x = 169289. 52x = 1317. x = 52 * 1713 = 68.

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