Mock Test

Exam: RRB NTPC Subject: Quantitative Aptitude Topic: Number System

Total Questions: 20

Q1. What is the general term of an arithmetic progression?

a_n = a_1 * r^(n-1) a_n = a_1 + (n-1)d S_n = n/2 * (2a_1 + (n-1)d) a_n = n*d
Q2. How many digits does the Armstrong number 54748 have?

3 4 5 6
Q3. How many trailing zeros are there in $100! / 50! \times 20!$?

20 22 24 26
Q4. The digital root of a three-digit number is 7. If the hundreds digit is 1, and the unit digit is 2 more than the tens digit, what is the number?

136 145 154 163
Q5. The digital sum of 1001 is:

1 2 3 4
Q6. If x/y = 3/2 and y/z = 4/5, then the value of x:y:z is:

3:2:5 6:4:5 3:8:10 6:4:10
Q7. In an AP, if a_1 = 10 and d = -2, what is the 6th term?

0 2 8 -2
Q8. How many zeros are at the end of 155!?

31 32 33 34
Q9. What is the next number in the series: 4, 16, 36, 64, 100, ?

121 144 169 196
Q10. What is the smallest 4-digit palindrome number?

1001 1111 1010 1101
Q11. Consider the number 123456789101112...99100. What is the remainder when this number is divided by 9?

0 1 8 9
Q12. Which of the following is an even number?

3 7 12 15
Q13. If a + b = 10 and a - b = 4, what is the value of a?

5 6 7 8
Q14. Determine the number of digits in the value of $C(18, 5)$.

4 5 6 7
Q15. What is the smallest even natural number?

0 1 2 4
Q16. Determine the number of trailing zeros in 35!.

7 8 9 10
Q17. The number 0 is considered an Armstrong number.

True False Only in certain bases Undefined
Q18. Which of the following is an even number?

1 3 4 5
Q19. The difference between the 25th triangular number and the 20th triangular number is:

135 155 165 180
Q20. What is the sum of the Armstrong numbers between 1000 and 2000?

1634 2000 3634 4074

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