Attempt the official UPSC Prelims previous year question paper 2018 as a free, timed mock test on AajExam. Get instant scoring, sectional analysis, and detailed solutions for every question.
| Section | Questions | Marks/Q | Negative |
|---|---|---|---|
| CSAT (Aptitude) | 80 | 2.5 | 0.83 |
Showing 5 of 80 questions. Start the mock test to attempt all questions in timed mode.
Consider the following three-dimensional figure: How many triangles does the above figure have ?
Explanation
As we can observe from the figure that it has 5 triangles → At the upper most part 5 triangles → At the lower most part 10 triangles → At the middle part (2 triangles each in 5 faces) Total no. of triangles = 5 + 5 + 10 = 20.
Consider the following sum: •+ 1• + 2• + •3 + •1 = 21• In the above sum, • stands for
Explanation
We will put options one by one in place of 1 2 3 1 2 1 + (i) Taking 4 as 4 + 14 + 24 + 43 + 41 = 126 It is not correct (ii) Taking 5 as 5 + 15 + 25 + 53 + 51 = 149 It is not correct (iii) Taking 6 as 6 + 16 + 26 + 63 + 61 = 172 It is also not correct (iv) Taking 8 as 8 + 18 + 28 + 83 + 81 = 218 So, is 8 [* We can get correct option by adding unit digit of numbers]
Consider the following pattern of numbers: 8 6 5 7 4 4 6 8 8 6 ? What is the number at ? in the above pattern ?
Explanation
If we check pattern in each column 8 + 4 – 6 = 6 10 + 6 – 5 = 11 15 + 8 – 7 = 16 \ 13 + 8 – 4 = 17 8 4 add and subtract
How many diagonals can be drawn by joining the vertices of an octagon ?
Explanation
We know that, Number of diagonals = n n ( ) −3 2 [n is number of sides] In octagon, number of sides = 8 No. of diagonals = 8 8 3 2 ( )
The figure drawn below gives the velocity graphs of two vehicles A and B. The straight of two vehicles A and B. The straight line OKP represents the velocity of vehicle A at any instant, whereas the horizontal straight line CKD represents the velocity of vehicle B at any instant. In the figure, D is the point where perpendicular from P meets the UPSC CIVIL SERVICES EXAMINATION (PRELIMS)-CSAT horizontals line CKD such that PD = 1 LD 2 What is the ratio between the distances covered by vehicles A and B in the time interval OL?
Explanation
We know that, area gives distance in V – t graph Let PD be “x” units \ PL = x + 2x = 3x units \ LD = 2x units Distance covered by A Distance covered by B Area of POL Are a of COLD 1 2 3 2 3 4 OL OL x x Required ratio is 3 : 4.
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The paper contains 80 multiple-choice questions to be attempted in 120 minutes for a total of 200 marks, with 0.33 negative marking per wrong answer.
The UPSC Prelims 2018 paper covers the following sections: CSAT (Aptitude). Each section is designed to test a specific skill set required for the UPSC Prelims exam.
Yes. Every question on this PYQ paper has the correct answer and a detailed explanation. After submitting the test, you can review each question with step-by-step solutions, concept references, and tips on how to solve similar questions faster.
Yes. You can attempt this PYQ paper as many times as you like. Each attempt is recorded separately so you can track improvement in score, accuracy, and time-management.
Government exam toppers consistently say PYQ practice is the single highest-leverage strategy. UPSC Prelims repeats question patterns, frequently-tested concepts and difficulty distribution year after year. Solving 8-10 PYQ shifts before the exam dramatically improves time management and confidence.
120 min · 200 marks
120 min · 200 marks
120 min · 200 marks
120 min · 200 marks
120 min · 200 marks
120 min · 200 marks