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 - The sum of first 25 natural numbers is?

A - 125

B - 325

C - 20

D - 750

Answer : B

Explanation

Sn = (1 + 2 + 3 + 4 + ... + 25)
A.P -> a = 1, d = 1, n = 25 where n = terms
Sn = S25 = n2[2a + (n-1)d]
= 252 [2 x 1 + (25 - 1) x 1]
= 25 x 13
= 325

Q 3 - If p and q are odd numbers, then which of these is even?

A - pq

B - p + q

C - pq - 2

D - none of these

Answer : B

Explanation

Sum of two odd numbers is even
Example:
p = 19, q = 37
p + q = 56 i.e. even.

Q 4 - How many terms are there in the G.P 3, 6, 12, ... , 768?

A - 8

B - 9

C - 7

D - 10

Answer : B

Explanation

a = 3, r = 62 = 2
Let number of terms = n
-> tn = 768
-> 768 = arn-1
-> 768 = 3 x 2n-1
-> 7683 = 2n-1
-> 256 = 2n-1
-> 28 = 2n-1
-> n = 9
Therefore number of terms = 9

Answer : D

Explanation

= 190 x (102)4
= 190 x 10424
= 118750

Q 6 - What is the unit digit in in 795 - 358 ?

A - 0

B - 4

C - 6

D - 7

Answer : B

Explanation

  795 = (74)23 x 73 So Unit digit in 795 = Unit digit in 1 x 343 = 3  358 = (34)14 x 32 So Unit digit in 358 = Unit digit in 1 x 9 = 9  So Unit digit in 795 - 358 = Unit digit in 13 - 9 = 4.

Q 7 - 935421 x 625 = y. What is y?

A - 584638135

B - 584638145

C - 584638125

D - 584638115

Answer : C

Explanation

  y = 935421 x 625  = 935421 x (5)4  = 935421 x (10/2)4  = (935421 x (10)4)/(2)4)  = 935421 x 10000 / 16  = 9354210000 / 16  = 584638125  

Q 8 - 12846 x 593 + 12846 x 407 = y. What is y?

A - 12846000

B - 14203706

C - 24038606

D - 24064000

Answer : A

Explanation

  y = 12846 x 593 + 12846 x 407  = 12846 x (593 + 407)  = 12846 x 1000  = 12846000  

Q 9 - What is the first prime number?

A - 0

B - 1

C - 2

D - 3

Answer : C

Explanation

2 is the first prime number.

Q 10 - One number is twice the second number and thrice the third number. If average of numbers is 44. What is the number?

A - 90

B - 99

C - 45

D - 36

Answer : B

Explanation

  Let's have smallest number be a  Thus (a + 2a + 3a) / 3 = 44  => 4a / 3 = 44  => a = 33  => largest number = 3a = 99  



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