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UPSC CDS Physics Questions
Practise physics (science) for the Combined Defence Services Examination: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Physics practice
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Q1.The upthrust on a body immersed in a fluid equals the weight of fluid displaced. This is:
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Answer: C — Archimedes’ principle
Archimedes’ principle.
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Q2.Find the power dissipated when 2 A flows through a 25 Ω resistor.
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Answer: A — 100 W
P = I²R = 2² × 25 = 100 W.
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Q3.A transformer works on the principle of:
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Answer: D — Mutual induction
A changing current in one coil induces a voltage in the other.
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Q4.What force is needed to accelerate a 17 kg mass at 3 m/s²?
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Answer: C — 51 N
F = ma = 17 × 3 = 51 N.
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Q5.The unit of electrical resistance is the:
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Answer: B — Ohm
Resistance is measured in ohms (Ω).
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Q6.Find the kinetic energy of a 33 kg body moving at 3 m/s.
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Answer: C — 148.5 J
KE = ½mv² = ½ × 33 × 3² = 148.5 J.
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Q7.The device that converts mechanical energy into electrical energy is a:
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Answer: D — Generator
A generator uses electromagnetic induction.
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Q8.A body with initial velocity 6 m/s accelerates at 4 m/s² for 10 s. Find the distance covered.
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Answer: C — 260 m
s = ut + ½at² = 6×10 + ½×4×10² = 260 m.
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Q9.The SI unit of force is the:
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Answer: C — Newton
1 newton = 1 kg·m/s².
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Q10.A body with initial velocity 18 m/s accelerates at 1 m/s² for 3 s. Find the distance covered.
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Answer: A — 58.5 m
s = ut + ½at² = 18×3 + ½×1×3² = 58.5 m.
How to approach physics questions
Write the formula before substituting and keep SI units throughout. Most numerical questions use one of: v = u + at, s = ut + ½at², F = ma, KE = ½mv², V = IR, P = I²R.
About UPSC CDS
Combined Defence Services Examination — conducted by Union Public Service Commission (UPSC). Selects officers for the Indian Military Academy, Naval Academy, Air Force Academy and Officers’ Training Academy.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
UPSC CDS practice topics
| Topic | Section | Question source |
|---|---|---|
| English Grammar | English | Question bank |
| Vocabulary & Idioms | English | Question bank |
| Indian Polity, History & Geography | General awareness | Question bank |
| Physics | Science | Calculated + question bank |
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Geometry & Mensuration | Mathematics | Calculated (new numbers every set) |