Number System Questions Practice Question and Answer

Q:

The largest natural number which exactly divides the product of any four consecutive natural numbers is

1010 0

  • 1
    24
    Correct
    Wrong
  • 2
    120
    Correct
    Wrong
  • 3
    6
    Correct
    Wrong
  • 4
    12
    Correct
    Wrong
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Answer : 1. "24 "

Q:

The east positive integer that should be subtracted from 3011 x 3012 so that the difference is a perfect square is-

1008 0

  • 1
    3009
    Correct
    Wrong
  • 2
    3010
    Correct
    Wrong
  • 3
    3011
    Correct
    Wrong
  • 4
    3012
    Correct
    Wrong
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Answer : 3. "3011"
Explanation :

We know that 3011 x 3012

= 3011 (3011 + 1)

= (3011)+ 3011

We know    

Required least number = 3011

Q:

The least number that should be added to 2,397 so that the sum is exactly divisible by 3, 4, 5 and 6 ?

1007 1

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

Q:

If two numbers are each divided by the same divisor, the remainders are respectively 3 and 4. If the sum of the two numbers be divided by the same divisor, the remainder is 2. The divisor is 

1002 0

  • 1
    9
    Correct
    Wrong
  • 2
    7
    Correct
    Wrong
  • 3
    5
    Correct
    Wrong
  • 4
    3
    Correct
    Wrong
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Answer : 3. "5 "
Explanation :

Required divisor = 3 + 4 – 2 = 5

Q:

Directions: Find the wrong number in the following number series:

0.5, 2, 1, 4, 32, 512, 16384

1001 0

  • 1
    1
    Correct
    Wrong
  • 2
    2
    Correct
    Wrong
  • 3
    4
    Correct
    Wrong
  • 4
    32
    Correct
    Wrong
  • 5
    512
    Correct
    Wrong
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Answer : 2. "2"

Q:

Find the greatest number which divides 108, 124 and 156, leaving the same remainder. 

998 0

  • 1
    18
    Correct
    Wrong
  • 2
    10
    Correct
    Wrong
  • 3
    12
    Correct
    Wrong
  • 4
    16
    Correct
    Wrong
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Answer : 4. "16 "

Q:

The largest three-digit number that gives the same remainder 2 when divided by 3, 5 and 9 is ________.

995 0

  • 1
    999
    Correct
    Wrong
  • 2
    984
    Correct
    Wrong
  • 3
    998
    Correct
    Wrong
  • 4
    992
    Correct
    Wrong
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Answer : 4. "992"

Q:

In a class, there are ' z ' students. Out of them ‘x’ are boys. What part of the class is composed of girls? 

994 0

  • 1
    $$1-{x\over z} $$
    Correct
    Wrong
  • 2
    $${x\over z}-1 $$
    Correct
    Wrong
  • 3
    $${x\over z} $$
    Correct
    Wrong
  • 4
    $${z\over x} $$
    Correct
    Wrong
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Answer : 1. "$$1-{x\over z} $$"

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