If 1x + 1y = u and xy =&n

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 Multiple Choice QuestionsMultiple Choice Questions

1.

1f 800880 = 8 x 10x + 8 x 10y + 8 x 10z where x, y and z are whole numbers, then the value of x + y + z is

  • 6

  • 5

  • 11

  • 8


2.

Mode of the given data

29, 25, 38, 22, 38, 25, 38, 29 is

  • 29

  • 38

  • 25

  • 22


3.

Four traffic lights give red signals after 30 sec, 45 sec, 60 sec and 120 sec respectively. If all the traffic lights began at the same time, then all of them will give red signal at the same time in

  • 180s

  • 120s

  • 300s

  • 360s


4.

If ax = b, by = c and cz = a, then the non-zero value of xyz is

  • 1

  • 2

  • 3

  • - 1


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5.

If 1x + 1y = u and xy = 1v, then the value of1x2 + 1y2 is 

  • 1μ2 - 2ν

  • μ2 - 2ν

  • μ2 - 2ν

  • 1μ2 - 2ν


B.

μ2 - 2ν

1x + 1y2 = μ2 1x2 + 1y2 + 2xy = μ2 1x2 + 1y2 = μ2 - 2ν


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6.

    7.

    The least number which must be added to 893304 to obtain a perfect square is

    • 1521

    • 1042

    • 1612

    • 945


    8.

    The values of y for which the 4-digit number 51y3 is divisible by 9 is

    • 2 or 3

    • 0 or 9

    • 0 or 3

    • 3 or 9


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    9.

    The value of 2abc5bac, where a = 2, b = 3 and c = 0, is

    •  - 1

    • 25

    • 1

    • 0


    10.

    The value of 4 + 4410 + 404100 + 4441000 + 410000 is

    • 12.8844

    • 12.8804

    • 12.8224

    • 12.8944


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