Number system Practice Question and Answer

Q:

1! + 2! + 3! + 4! + ......... + 50! Find the unit digit of?

702 0

  • 1
    1
    Correct
    Wrong
  • 2
    3
    Correct
    Wrong
  • 3
    5
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 2. "3"

Q:

If the 8 digit number 789x531y is divisible by 72, then the value of (5x - 3y) will be?

787 0

  • 1
    0
    Correct
    Wrong
  • 2
    -1
    Correct
    Wrong
  • 3
    2
    Correct
    Wrong
  • 4
    1
    Correct
    Wrong
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Answer : 2. "-1"

Q:

When a number is divided by 192 the remainder is 54. What will be the remainder when the same number is divided by 16?

704 0

  • 1
    2
    Correct
    Wrong
  • 2
    4
    Correct
    Wrong
  • 3
    6
    Correct
    Wrong
  • 4
    8
    Correct
    Wrong
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Answer : 3. "6"

Q:

For which value of x the seven-digit number 8439x53 is divisible by 99?

837 0

  • 1
    9
    Correct
    Wrong
  • 2
    4
    Correct
    Wrong
  • 3
    3
    Correct
    Wrong
  • 4
    6
    Correct
    Wrong
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Answer : 2. "4"

Q:

In an examination, a student was asked to find 3/11 of a certain number, by mistake, he found 3/4 of it. His answer was 315 more than the correct answer. The given number is –

1467 0

  • 1
    629
    Correct
    Wrong
  • 2
    660
    Correct
    Wrong
  • 3
    617
    Correct
    Wrong
  • 4
    576
    Correct
    Wrong
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Answer : 2. "660"

Q:

The product of the zeroes of the quadratic polynomial x2+7x+ 10 is

698 0

  • 1
    12
    Correct
    Wrong
  • 2
    10
    Correct
    Wrong
  • 3
    32
    Correct
    Wrong
  • 4
    42
    Correct
    Wrong
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Answer : 2. "10"

Q:

What is the smallest digit that must be added to the product 5786 × 5784 to make it a perfect square?

861 0

  • 1
    1
    Correct
    Wrong
  • 2
    6
    Correct
    Wrong
  • 3
    5
    Correct
    Wrong
  • 4
    4
    Correct
    Wrong
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Answer : 3. "5"

Q:

When (6767 +67) is divided by 68, the remainder is-

966 0

  • 1
    13
    Correct
    Wrong
  • 2
    63
    Correct
    Wrong
  • 3
    66
    Correct
    Wrong
  • 4
    67
    Correct
    Wrong
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Answer : 3. "66"
Explanation :

(6767+ 67) = 67(6766 + 166)

As 66 is an even number

We know   6766 is an even number

We know   (6766 + 1) is perfectly divisible by (67 + 1)

i.e. 68

We know   The remainder = 66

(6767+ 67) = 67(6766 + 166)

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