Practice MCQ Questions and Answer on Number System
21.
Among the following statements, the statement which is not correct is :
- (A) Every natural number is an integer.
- (B) Every natural number is a real number.
- (C) Every real number is a rational number.
- (D) Every integer is a rational number.
22.
A number of boys raised Rs. 400 for a famine relief fund, each boy giving as many 25 paise coins as there were boys. The number of boys was -
- (A) 40
- (B) 16
- (C) 20
- (D) 100
23.
The unit's digit in the product 274 ÃÂÃÂÃÂÃÂÃÂÃÂ 318 ÃÂÃÂÃÂÃÂÃÂÃÂ 577 ÃÂÃÂÃÂÃÂÃÂÃÂ 313 is :
- (A) 2
- (B) 3
- (C) 4
- (D) 5
24.
$$\frac{1}{5}$$ of a number exceeds $$\frac{1}{7}$$ of the same number by 10. The number is -
- (A) 25
- (B) 150
- (C) 175
- (D) 200
25.
The sum of four consecutive two-digit odd numbers, when divided by 10, become a perfect square. Which of the following can possibly be one of these four numbers?
- (A) 21
- (B) 25
- (C) 41
- (D) 67
26.
Which of the following number is not divided by 18 ?
- (A) 54036
- (B) 50436
- (C) 34056
- (D) 65043
27.
The largest among the numbers ?
- (A) $${\left( {0.1} \right)^2}$$
- (B) $$\sqrt {0.0121\,} $$
- (C) 0.12
- (D) $$\sqrt {0.0004} $$
28.
Which one of the following numbers is divisible by 3 ?
- (A) 4006020
- (B) 2345678
- (C) 2876423
- (D) 9566003
29.
Between two distinct rational numbers a and b, there exists another rational number which is :
- (A) $$\frac{a}{2}$$
- (B) $$\frac{b}{2}$$
- (C) $$\frac{ab}{2}$$
- (D) $$\frac{a + b}{2}$$
30.
What decimal of a week is an hour ?
- (A) 0.0059
- (B) 0.0062
- (C) 0.062
- (D) 0.059