TNPSC Maths question paper with answers
16. The total number of prime factors of the product (8) 20 x (15) 24 x (17) 15 Is
A)59 B) 98 C) 123 D) 4
è 820 x (5) 24 x (17)15
è (23)20 x (5x3)24 x 17)15
è 260 x 524 x 324 x (17)15
è 60 + 24 + 24 + 15 = 123
123
17. The sum of three prime is (0). This difference of two of them is 24. What are numbers
A) 5, 59, 37 B) 41, 53,7 C) 11, 37, 53 D) 3, 61, 37
3, 61, 37
[: 61 – 37 =2 4]
18. The average of the first five prime number
a) 5.0 b)5.2 c) 5.6 d) 6.0
Solution:
= 
= 5.6
5.6
19. What is the sum all prime numbers b/w, 100 and 120
a) 424 b) 533 c) 648 d) 650
533
20. 0. 
+ 0.3
a) 0.6
b) 0.
(c) 0.6
d) 0.64
0.34 = 0.343434………
0.34 = 0.344444
-----------------
= 0.687878………
0.687
ANS A
21. Express the following decimal expression into rational 0.
= ?
a) 2/11
b) 1/99
c) 8/99
d) 6/11
Solution:
0.18 = 18/99 = 2/11
2/11
22. Express the following deci into rational 7.
=?
a) 22/3
b) 7/3
c) 7/9
d) 7 1 /9
Solution:
7.3= 7+0.333 = 7 +0.3 = 7+ 3/9 = 22/3
22/3
23. DF 1/7 = 0.
then the value 5/7 is
a) 0.
b) 0.
c) 0.
d) 0.714285
Solution:
5/7 = 0.71428571
So 5/7 = 0.
0.
24. Which one the Following has a terminating decimal expression?
a )5/12
b) 3/7
c) 4/5
d) 6/13
4/5
25. Which of the following are irrational numbers?
1, √11 2, √64 3, 0.72022002… 4, 0.025
a) 1
d) 1 and 3
a) 1 and 4
b) 2 and 4
1 and 3
26. How many numbers from1 to 100 are there each of which is not only exactly divisible by 4, but also has 4 as a digit.
a) 14
B) 7
c) 21
d) 10
solution:
à 4, 14, 24, 34, 44, 48, 40, 64, 54, 74, 80, 94.
7
27. Which one one of the following number is a divisible by 25?
a) 303310
b) 313355
c) 303375
d) 22040
Solution:
(rule for divisible by 25 two digits of the given number must be 00, 25, 75, 1550)
So, 303375 divisible by 25
303375
28. Consider the following statements,
A number a1, a2, a3, a4, a5 is divisible by 9 if:
1. a1+a2+a3+a4+a5 in divisible by 9
2. a1-a2-a3-a4-a5 is divisible by 9,
Which of the above statement is are correct?
a) 1 only b) 2 only c) both 1 and 2 d) Neither 1 or 2
1 only
29. How many of the following numbers are divisible by 3 but not by 9?
2133, 2343, 3474, 4131, 5286, 5350, 6336, 7347, 811, 9276
a) 5 b) 6 c) 7 d) None of these
6
30. Which one of the following pair is relatively prime number 200
A) (77, 99) B) (74, 33) C) (19,57) D) (13,52)
(77, 99)
