TNPSC Question Paper-2015 Questions and answers

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This page contains the questions asked in previous year TNPSC Group 1 preliminary exam. You can practice these questions as practice test in this link.


31).

Among the 50 students in a class, what percentage of students like biology and chemistry.

Subjects No of Students
Mathematics 6
Physics 12
Chemistry 15
Biology 8
Computer science 9

A). 0.64
B). 0.46
C). 0.23
D). 0.77
32). For any n observation of data, what is the value of \( \left(\Sigma x \right) -n\overline{x}\)?
A). \( n\left( \Sigma x \right) \)
B). \( \left( n - 2 \right) \overline{x} \)
C). \( \left( n - 1 \right) \overline{x} \)
D). 0
33).

Simplify : \( \large\frac{0.728 \times 0.728 - 0.272 \times 0.272}{0.456} \)


A). 0.456
B). 1
C). 0.728
D). 0.272
34).

If \( \large\frac{x}{y} =\frac{3}{5} \), then \( \large\frac{5x+2y}{5x - 2y}\) is equal to


A). 3
B). 5
C). \( \frac{2}{5} \)
D). \( \frac{5}{2} \)
35). A person's present age is two-fifth of the age of his mother. After 8 years, he will be one half of the age of his mother. How old is the mother at present?
A). 42
B). 40
C). 45
D). 48


36). Find the value of \( \large\frac{1.2 \times 1.2 \times 1.2 - 0.2 \times 0.2 \times 0.2 }{1.2 \times 1.2 + 1.2 \times 0.2 + 0.2 \times 0.2 } \)
A). 1.2
B). 1
C). 0.2
D). 1.4
37). A bicycle marked at Rs. 1,500 is sold for Rs. 1,350. What is the percentage of discount?
A). 12
B). 15
C). 11
D). 10
38). Which one of the following is the smallest ratio?
7:13, 17:25, 7:15, 15:23

A). 7 : 13
B). 17 : 25
C). 7 : 15
D). 15 : 23
39). In a mixture of 60 litres, the ratio of milk and water is 2 : 1. If this ratio is to be 1 :2, then what is the quantity of water to be further added?
A). 20 l
B). 30 l
C). 50 l
D). 60 l
40). Two numbers are in the ratio of 3 : 5. If 9 be subtracted from each, then they are in the ratio of 12 : 23. Find the second number.
A). 52
B). 53
C). 54
D). 55
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