Mock Test

Exam: RRB Group D Subject: Mathematics Topic: Number System

Total Questions: 20

Q1. In the addition 12.3 + 4.56 + 7.890, how many significant figures should the result have, considering the precision of each term?

2 3 4 5
Q2. The smallest number by which 180 should be multiplied to make it a perfect square is:

2 3 5 6
Q3. Which natural number is the additive identity?

0 1 2 None of these
Q4. Which of the following is an even number?

181 183 185 186
Q5. Find the LCM of 20 and 25.

5 45 100 500
Q6. Which of the following equations represents a Pythagorean triple?

$x + y = 10$ $x^2 + y^2 = z^2$ $3x - 4y = 5$ $2x + 2y = 6$
Q7. Which of the following is NOT an odd number?

15 17 19 20
Q8. What is the smallest positive integer x such that x ≡ 1 (mod 2), x ≡ 2 (mod 3), and x ≡ 3 (mod 5)?

5 17 23 29
Q9. If C(n, 3) = 20, what is n?

5 6 7 8
Q10. Which of these is a cube number?

15 24 64 80
Q11. How many significant figures are in the number 1000.0?

1 2 3 4
Q12. What is the unit digit of the square of 78?

4 6 2 8
Q13. The sum of the cubes of the first 'n' even numbers is given by the formula:

2n²(n+1)² n²(n+1)² 4n²(n+1)² 8n²(n+1)²
Q14. What is the sum of 20, 30, and 40?

80 90 100 110
Q15. What number should replace the question mark in the series: 1, 8, 30, 104, 354, ?

1208 1198 1354 1104
Q16. If a point is at 4, moving 6 units to the left will take it to:

10 2 -2 0
Q17. If p/q is a rational number in its lowest terms, and q is a power of 2 times a power of 3, then the decimal representation of p/q is:

Terminating Non-terminating and repeating Non-terminating and non-repeating Depends on the value of p
Q18. Which of the following is NOT a composite number?

15 17 21 25
Q19. A number that is not abundant is called:

Perfect number Deficient number Abundant number Composite number
Q20. If (1101.101)2 = (X.Y)10, what is the value of X?

13 12 14 11

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