The Tamil Nadu Public Service Commission (TNPSC) exams include a section on Aptitude and Mental Ability, which is part of the General Studies paper in Group I, II, II-A, and IV exams. This section tests candidates on their logical reasoning, numerical ability, and problem-solving skills.

Key Topics Covered:

1. Simplification

2. Percentage

3. Ratio and Proportion

4. Simple and Compound Interest

5. Time, Speed, and Distance

6. Time and Work

7. Profit and Loss

8. Area and Volume

9. Data Interpretation (Tables, Graphs, Charts)

10. Puzzles and Logical Reasoning

11. Number Series

12. Algebra and Geometry (basic level)

Purpose:

• To assess the candidate’s numerical and analytical thinking ability.

• Helps select candidates capable of handling administrative and clerical roles efficiently.

Tips for Preparation:

• Practice previous year TNPSC question papers.

• Use standard books like R.S. Aggarwal’s Quantitative Aptitude.

• Focus on time management and accuracy.

Sample Aptitude Questions:

1. Simplification:

   What is the value of:
   $150÷5\times 2+10=?$
   A. 70 B. 65 C. 60 D. 50
   Answer: A. 70

2. Percentage:

   If 25% of a number is 45, what is the number?
   A. 160 B. 180 C. 200 D. 150
   Answer: B. 180

3. Ratio and Proportion:

   Divide Rs. 600 between A and B in the ratio 2:3.
   A. Rs. 240, Rs. 360 B. Rs. 300, Rs. 300
   Answer: A. Rs. 240 (A), Rs. 360 (B)

4. Time and Work:

   A can complete a work in 10 days, B in 15 days. Working together, how many days will they take?
   A. 6 B. 5 C. 8 D. 9
   Answer: A. 6 days

5. Profit and Loss:

   A man bought an article for Rs. 240 and sold it for Rs. 300. What is the profit percentage?
   A. 20% B. 25% C. 30% D. 35%
   Answer: B. 25%

6. Logical Reasoning:

   Find the missing number:
   2, 6, 12, 20, ?, 42
   A. 28 B. 30 C. 32 D. 36
   Answer: C. 30