Aptitude - Number System Online Quiz


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Following quiz provides Multiple Choice Questions (MCQs) related to Number System. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.

Questions and Answers

Q 1 - The unit digit in the product (536 x 764 x 358)?

A - 4

B - 3

C - 2

D - 1

Answer : C

Explanation

Unit Digit = Unit Digit in (6 x 4 x 8)
= 2

Q 2 - (568 x 568 x 568 + 432 x 432 x 432) / (568 x 568 - 568 x 432 + 432 + 432) = ?

A - 568

B - 1000

C - 432

D - 10

Answer : B

Explanation

This is solved using the following formulae:
(a3 + b3) = (a + b)( a2 - ab + b2)
The value of (a+b) =
(a3 + b3) / ( a2 - ab + b2) =
(568 + 432) = 1000

Q 3 - Which of the following is a prime number?

A - 24

B - 35

C - 125

D - 151

Answer : D

Explanation

151 is greater than 12
All prime numbers less than 12 is 2, 3, 5, 7, 11
24 is divisible by 3 i.e. not prime
35 is divisible by 5 i.e. not prime
125 is divisible by 5 i.e. not prime
151 is divisible by 2, 3, 5, 7, 11 i.e. prime number.

Q 4 - Which of the following numbers are divisible by 3 but not by 9?

A - 936

B - 39987

C - 2343

D - 36

Answer : C

Explanation

For this, calculate the sum of digits:
936: Sum of digits = 18 i.e. divisible by 3 and 9.
39987: Sum of digits = 36 i.e. divisible by 3 and 9.
2343: Sum of digits = 12 i.e. divisible by 3, but not by 9.
36: Sum of digits = 9 i.e. divisible by 3 and 9.

Q 5 - I how many ways can 22500 be written as a product of two different factors?

A - 10

B - 32

C - 22

D - 12

Answer : C

Explanation

1502 = 22500
Therefore, 1502 = ((2)(5)(3)(5))2 = 225432
= 12{(2 + 1)(4 + 1)(2 + 1) - 1}
= 22

Q 6 - Which of the following remains if 17200 is divided by 18?

A - 17

B - 16

C - 1

D - 2

Answer : C

Explanation

  As (a+b) always divides (an - bn) if n is an even number.  ∴ 17200 - 1200 is divisible by 17 + 1  ∴ 17200 - 1 is divisible by 18  ∴ When 17200 is divided by 18, remainder is 1.  

Q 7 - 496157 x 9999 = y. What is y?

A - 4691100813

B - 4691100843

C - 4691100823

D - 4691100833

Answer : B

Explanation

  y = 496157 x 9999    = 496157 x (10000 - 1)   = 496157 x 10000 - 496157   = 4961570000 - 496157   = 4691100843   

Q 8 - 1008 x 992 = y. What is y?

A - 900936

B - 999816

C - 969836

D - 999836

Answer : A

Explanation

  y = 1008 x 992     = (1000 + 8) x (1000 - 8)  Using formulae (a+b)(a-b) = a2 - b2  ∴ y =  (1000)2 - (8)2  = 1000000 - 64  = 999936  

Q 9 - What is the sum of first five prime numbers?

A - 11

B - 18

C - 26

D - 28

Answer : D

Explanation

First five prime numbers are 2, 3, 5, 7, 11. Sum - 28

Q 10 - 517p324 is divisible by 3. What is minimum p?

A - 0

B - 1

C - 2

D - 3

Answer : B

Explanation

    5 + 1 + 7 + p + 3 + 2 + 4  = 22 + x  which is divisible by 3  ∴ x = 2  



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