📢 Solved MCQs & PYQs for Competitive Exams (UPSC, SSC, RPSC & More) – Part 1
Physics Most Important Questions with Answers & Explanations
"Practice solved MCQs & previous year questions (PYQs) for UPSC, SSC, RPSC & competitive exams. Physics multiple-choice questions with detailed answers & explanations."
🔹 Physics MCQs for UPSC, SSC, RPSC & Competitive Exams
✅ Topic-Wise Solved MCQs – Covers Mechanics, Thermodynamics, Electricity, Magnetism, Optics & Modern Physics
✅ PYQs from UPSC, SSC CGL, RPSC, Railways, NDA & State PSC Exams
✅ Detailed Explanations with Tricks & Formulas
📌 Mechanics & Motion – MCQs for Competitive Exams
Q1. A body is moving in a circular path with uniform speed. What remains constant?
(A) Velocity
(B) Acceleration
(C) Kinetic Energy
(D) Momentum
✅ Answer: (C) Kinetic Energy
📌 Explanation: In uniform circular motion, speed remains constant, but direction changes continuously, affecting velocity & momentum. Kinetic energy remains unchanged.
Q2. The acceleration due to gravity on the moon is approximately:
(A) 1.62 m/s²
(B) 9.8 m/s²
(C) 3.7 m/s²
(D) 6.67 m/s²
✅ Answer: (A) 1.62 m/s²
📌 Explanation: The moon has 1/6th of Earth’s gravity due to lower mass and radius.
Q3. What is the SI unit of force?
(A) Pascal
(B) Newton
(C) Joule
(D) Watt
✅ Answer: (B) Newton
📌 Explanation: Force = Mass × Acceleration (F = ma). Newton (N) is the SI unit of force.
📌 Work, Energy & Power – MCQs for Competitive Exams
Q4. A body of mass 10 kg is lifted to a height of 5 meters. The work done is (g = 9.8 m/s²):
(A) 50 J
(B) 98 J
(C) 490 J
(D) 980 J
✅ Answer: (C) 490 J
📌 Formula: Work Done (W) = mgh = 10 × 9.8 × 5 = 490 J
Q5. What is the SI unit of power?
(A) Joule
(B) Newton
(C) Watt
(D) Pascal
✅ Answer: (C) Watt
📌 Explanation: Power = Work Done / Time. The SI unit is Watt (W).
📌 Thermodynamics – Important MCQs
Q6. Which of the following laws states that energy cannot be created or destroyed?
(A) First Law of Thermodynamics
(B) Second Law of Thermodynamics
(C) Zeroth Law of Thermodynamics
(D) Newton’s Law
✅ Answer: (A) First Law of Thermodynamics
📌 Explanation: Energy conservation principle states that total energy in an isolated system remains constant.
Q7. The efficiency of a Carnot engine depends on:
(A) Temperature of hot and cold reservoirs
(B) Work output
(C) Mass of the system
(D) None of the above
✅ Answer: (A) Temperature of hot and cold reservoirs
📌 Formula: Efficiency η = 1 - (T₂/T₁), where T₁ = Hot Reservoir, T₂ = Cold Reservoir.
📌 Electricity & Magnetism – PYQs & MCQs
Q8. Which of the following materials is a good conductor of electricity?
(A) Rubber
(B) Plastic
(C) Copper
(D) Glass
✅ Answer: (C) Copper
📌 Explanation: Copper has free electrons that facilitate electrical conduction.
Q9. The SI unit of electric charge is:
(A) Ampere
(B) Volt
(C) Coulomb
(D) Ohm
✅ Answer: (C) Coulomb
📌 Explanation: Charge (Q) is measured in Coulombs (C). One electron carries 1.6 × 10⁻¹⁹ C.
📌 Optics – MCQs for Competitive Exams
Q10. A convex lens is also known as:
(A) Diverging Lens
(B) Converging Lens
(C) Reflecting Lens
(D) None of these
✅ Answer: (B) Converging Lens
📌 Explanation: Convex lens converges light rays to a focal point, forming real & inverted images.
Q11. The phenomenon of splitting white light into its constituent colors is called:
(A) Reflection
(B) Refraction
(C) Dispersion
(D) Diffraction
✅ Answer: (C) Dispersion
📌 Explanation: Prism splits white light into seven colors (VIBGYOR) due to different refraction indices.
📌 Modern Physics – MCQs & PYQs
Q12. The energy of a photon is given by which formula?
(A) E = mc²
(B) E = hf
(C) P = VI
(D) W = F × d
✅ Answer: (B) E = hf
📌 Explanation: Planck’s Law: Photon Energy E = hf, where h = Planck’s constant, f = frequency.
Q13. The SI unit of radioactivity is:
(A) Curie
(B) Tesla
(C) Becquerel
(D) Joule
✅ Answer: (C) Becquerel
📌 Explanation: Becquerel (Bq) measures radioactive decay per second.
📌 Download Physics MCQs PDF for Competitive Exams
📥 Click Here to Download 100+ Solved Physics MCQs with Explanations
📌 Conclusion – Final Tips for Physics MCQs
✅ Practice Previous Year Questions (PYQs) Regularly
✅ Focus on Formulas & Conceptual Understanding
✅ Take Mock Tests for SSC, RPSC, UPSC & Railways
✅ Solve Numerical-Based MCQs to Improve Speed & Accuracy
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