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NDA Physics Questions
Practise physics (science) for the National Defence Academy & Naval Academy 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 frequency of a wave is measured in:
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Answer: D — Hertz
1 hertz = 1 cycle per second.
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Q2.Find the kinetic energy of a 20 kg body moving at 6 m/s.
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Answer: B — 360 J
KE = ½mv² = ½ × 20 × 6² = 360 J.
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Q3.The phenomenon responsible for the blue colour of the sky is:
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Answer: D — Rayleigh scattering
Shorter (blue) wavelengths are scattered more by air molecules.
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Q4.What force is needed to accelerate a 35 kg mass at 8 m/s²?
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Answer: D — 280 N
F = ma = 35 × 8 = 280 N.
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Q5.Acceleration due to gravity on Earth’s surface is about:
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Answer: D — 9.8 m/s²
g ≈ 9.8 m/s².
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Q6.Find the power dissipated when 3 A flows through a 20 Ω resistor.
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Answer: D — 180 W
P = I²R = 3² × 20 = 180 W.
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Q7.Which particle has no electric charge?
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Answer: D — Neutron
Neutrons are electrically neutral.
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Q8.What force is needed to accelerate a 39 kg mass at 5 m/s²?
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Answer: D — 195 N
F = ma = 39 × 5 = 195 N.
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Q9.The speed of light in vacuum is approximately:
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Answer: D — 3 × 10⁸ m/s
c ≈ 2.998 × 10⁸ m/s.
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Q10.A body with initial velocity 1 m/s accelerates at 4 m/s² for 2 s. Find the distance covered.
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Answer: D — 10 m
s = ut + ½at² = 1×2 + ½×4×2² = 10 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 NDA
National Defence Academy & Naval Academy Examination — conducted by Union Public Service Commission (UPSC). Entry to the tri-service National Defence Academy after Class 12, with Mathematics and General Ability papers.
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.
NDA practice topics
| Topic | Section | Question source |
|---|---|---|
| Algebra | Mathematics | Calculated (new numbers every set) |
| Geometry & Mensuration | Mathematics | Calculated (new numbers every set) |
| Probability & Combinatorics | Mathematics | Calculated (new numbers every set) |
| Physics | Science | Calculated + question bank |
| Chemistry | Science | Calculated + question bank |
| English Grammar | English | Question bank |