CDS (II) 2019 · Elementary Mathematics
A full Elementary Mathematics paper in the UPSC CDS pattern: 100 questions in 2 hours, with a third of the question's marks deducted for every wrong answer. Arithmetic, algebra, trigonometry, geometry, mensuration and statistics at Class 10 level, against the clock.
100questions
100marks
2 hoursno calculator
31/46/23easy / medium / hard
Topics in this paper
Mathematics · 100 questions
- Quadratic equations5
- Heights and distances5
- Percentage4
- Time and work4
- Number system4
- Algebraic identities4
- Trigonometric identities4
- Circles4
- HCF and LCM3
- Profit and loss3
- Compound interest3
- Mixtures3
- Time, speed and distance3
- Triangles3
Sample question from this paper
Percentage · medium
In an election between two candidates, the winner got 60% of the valid votes and won by 2400 votes. The total number of valid votes was
- A. 8000
- B. 10000
- C. 12000
- D. 14400
Show answer and solution
Answer: C
The loser got 40%, so the margin is 60% − 40% = 20% of the total. 20% of total = 2400 gives total = 2400 ÷ 0.2 = 12000. Dividing by 60% or 40% is the trap.
The loser got 40%, so the margin is 60% − 40% = 20% of the total. 20% of total = 2400 gives total = 2400 ÷ 0.2 = 12000. Dividing by 60% or 40% is the trap.