1.  0.000006723 when expressed in scientific notation, is:


6723*10^-5
67.23*10^-7
6.723*10^-6
None of these


Answer

 Option

0.000006723 = 0.000006723*10^6/10^6 = 6.723/10^6 = 6.723*10^-6

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2.  0.04*0.0162 is equal to?


6.48*10-^3
6.48*10-^4
6.48*10-5
6.48*10-^6


Answer

 Option

4*162 = 648. Sum of decimal places = 6 Therefore 0.04*0.0162 = 0.000648 = 6.48 * 10-^4

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3.  617 + 6.017 + 0.617 + 6.0017 =?


6.2963
62.965
629.6357
None of these


Answer

 Option

617.00 + 6.017 + 0.617 + 6.0017 = 629.6357.

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4.  792.02 + 101.32 - 306.76 = ?


586.58
893.34
997.11
1200.10


Answer

 Option

792.02 + 101.32 =893.34 893.34 - 306.76 = 586.58

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5.  If 47.2506 = 4A+7/B+2C+5/D+6E, then the value of 5A+3B+6C+D+3E is?


53.6003
53.603
153.6003
213.0003


Answer

 Option

4A+7B+2C+5D+6E 47.2506 => 4A+7B+2C+5/D+6E = 40+7+0.2+0.05+0.0006 Comparing the terms on both sides, we get: 4A = 40, 7/B = 7, 2C = 0.2, 5/D =0.05, 6E = 0.0006 or A =10, B =1, C = 0.01, D = 100, E = 0.0001. Therefore 5A+3B +6C+D+3E = (5*10) + (3*1) + (6*0.1) +100 + (3*0.0001) = 50+3+0.6+100+0.0003 =153.6003.

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