CDS (II) 2020 · General Knowledge
A full General Knowledge paper in the UPSC CDS pattern: 120 questions in 2 hours, with a third of the question's marks deducted for every wrong answer. Physics, Chemistry, Biology, defence and security, History, Geography, Polity, Economy and current events.
120questions
100marks
2 hoursno calculator
39/60/21easy / medium / hard
Topics in this paper
General Knowledge · 120 questions
- Armed Forces3
- Sports3
- Current affairs 20193
- Electromagnetic Waves2
- Heat2
- Polymers2
- Training Institutions2
- Awards2
- British expansion2
- Lakes2
- Indian rivers2
- Anti-defection2
- Banking2
- Current affairs 20202
Sample question from this paper
Mechanics · medium
A raindrop falling through air attains a constant terminal velocity when
- A. its weight becomes zero
- B. the air resistance becomes zero
- C. the viscous drag plus buoyant force balances its weight
- D. its mass becomes constant
Show answer and solution
Answer: C
As speed increases the retarding drag grows. At terminal velocity the upward drag and buoyancy equal the downward weight, so the net force and acceleration are zero. The weight never vanishes and air resistance is not zero at that stage.
As speed increases the retarding drag grows. At terminal velocity the upward drag and buoyancy equal the downward weight, so the net force and acceleration are zero. The weight never vanishes and air resistance is not zero at that stage.