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 - What is the result of the following?

 4 + 44 + 444 + 4.44 

A - 486.44

B - 444

C - 496.44

D - 44

Answer : C

Explanation

496.44

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 - The smallest prime number is?

A - 0

B - 1

C - 2

D - 3

Answer : C

Explanation

The smallest prime number is 2.

Q 4 - When a number is divided by 17, the remainder is 9. When the same number is divided by 23, the remainder is 4. Find the number?

A - 20

B - 349

C - 329

D - 60

Answer : B

Explanation

x = 17p + 9 and x = 23q + 4
i.e. 17p + 9 = 23q + 4
Therefore, q = (17p + 5)/23
Least value of p for which q is a whole number is p = 20
x = 17p + 9
= 17 x 20 + 9
= 349

Q 5 - Which of the following cannot be the square of a natural number?

A - 75625

B - 143642

C - 30976

D - 28561

Answer : B

Explanation

143642 cannot be the square of a natural number because the square of a natural number never ends in 2.

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 - 1014 x 986 = y. What is y?

A - 988804

B - 998814

C - 998904

D - 999804

Answer : D

Explanation

 y =1014 x 986 = 1014 x (1000 - 14) = 1014000 - 14196 = 999804  

Q 8 - (64)2 - (36)2 = 20 x y. What is y?

A - 70

B - 120

C - 180

D - 140

Answer : D

Explanation

  (64)2 - (36)2 = 20 x y  Using formulae (a+b)(a-b) = a2 - b2  => (64 + 36)(64 - 36) = 20 x y  => 100 x 28 = 20 x y  => y = 5 x 28  = 140  

Answer : A

Explanation

(a-b) divides an - bn completely for every natural number.

Q 10 - How many numbers are divisible by all 4,5 and 6 lying between 200 and 600.

A - 5

B - 6

C - 7

D - 8

Answer : B

Explanation

Each number should be divisible by L.C.M. of 4, 5 and 6 i.e. 60. So numbers are 240, 300, 360, 420, 480, 540. Count: 6



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