Practice MCQ Questions and Answer on Number System

21.

76n - 66n, where n is an integer > 0, is divisible by :

  • (A) 13
  • (B) 127
  • (C) 559
  • (D) All the above

22.

A number when divided by three consecutive numbers 9, 11, 13 leaves the remainders 8, 9 and 8 respectively. If the order of divisors is reversed, the remainders will be :

  • (A) 10, 8, 9
  • (B) 10, 1, 6
  • (C) 8, 9, 8
  • (D) 9, 8, 8

23.

If the sum of two numbers is 14 and their difference is 10, find the product of these two numbers.

  • (A) 18
  • (B) 20
  • (C) 24
  • (D) 22

24.

The numbers 2, 4, 6, 8 ..... 98, 100 are multiplied together. The number of zeros at the end of the product must be :

  • (A) 10
  • (B) 11
  • (C) 12
  • (D) 13

25.

If 51.844.32=12  , then the value of 0.0051840.432   is :

  • (A) 0.12
  • (B) 0.012
  • (C) 0.0012
  • (D) 1.2

26.

If a (0.4)2 , b = 0.04 and c = 25 , then the correct relationship among the three is :

  • (A) b > a > c
  • (B) a > b > c
  • (C) a > c > d
  • (D) c > a > b

27.

The number 89715938* is divisible by 4. The unknown non-zero digit marked as * will be :

  • (A) 2
  • (B) 3
  • (C) 4
  • (D) 6

28.

What is the least value of x such that 517x324 is divisible by 12?

  • (A) 3
  • (B) 1
  • (C) 0
  • (D) 2

29.

1+12+14+17+114+128      is equal to :

  • (A) 2
  • (B) 2.5
  • (C) 3
  • (D) 3.5

30.

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

  • (A) 6
  • (B) 12
  • (C) 24
  • (D) 120