📢 Solved MCQs & PYQs for Competitive Exams (UPSC, SSC, RPSC & More) – Part 2
Physics Most Important Questions with Answers & Explanations
"Practice advanced solved MCQs & previous year questions (PYQs) for UPSC, SSC, RPSC & competitive exams. Covers Modern Physics, Fluid Mechanics, Waves, and more."
📌 Fluid Mechanics – MCQs for Competitive Exams
Q1. The pressure exerted by a liquid at a given depth is directly proportional to:
(A) Density of the liquid
(B) Volume of the liquid
(C) Surface tension of the liquid
(D) Temperature of the liquid
✅ Answer: (A) Density of the liquid
📌 Explanation: Pressure (P) = ρgh (ρ = density, g = gravity, h = height). If the density increases, pressure also increases.
Q2. The SI unit of viscosity is:
(A) Pascal-second (Pa·s)
(B) Newton-second (N·s)
(C) Joule-second (J·s)
(D) Watt-second (W·s)
✅ Answer: (A) Pascal-second (Pa·s)
📌 Explanation: Viscosity is measured in Pascal-second (Pa·s) or Poise (P).
📌 Oscillations & Waves – MCQs for Competitive Exams
Q3. The time period of a simple pendulum depends on:
(A) Mass of the bob
(B) Length of the string
(C) Amplitude of oscillation
(D) Both B and C
✅ Answer: (B) Length of the string
📌 Formula: T = 2π√(L/g) (T = time period, L = length of pendulum, g = acceleration due to gravity).
Q4. The speed of sound is maximum in:
(A) Air
(B) Water
(C) Steel
(D) Vacuum
✅ Answer: (C) Steel
📌 Explanation: Sound travels fastest in solids because the particles are closely packed. Speed of sound in steel ~5000 m/s.
📌 Heat & Thermodynamics – Important MCQs
Q5. Which of the following is an example of isothermal process?
(A) Expansion of a gas in a perfectly insulated container
(B) Melting of ice
(C) Heating of water in a closed vessel
(D) Compression of gas with increasing temperature
✅ Answer: (B) Melting of ice
📌 Explanation: In an isothermal process, temperature remains constant. Melting of ice occurs at constant temperature.
Q6. The efficiency of a heat engine is given by:
(A) 1 - (T₂/T₁)
(B) T₁/T₂
(C) T₂/T₁
(D) (T₁ - T₂)/T₂
✅ Answer: (A) 1 - (T₂/T₁)
📌 Explanation: Efficiency η = 1 - (T₂/T₁), where T₁ = Temperature of hot reservoir, T₂ = Temperature of cold reservoir.
📌 Electromagnetic Induction – PYQs & MCQs
Q7. According to Lenz’s Law, the direction of induced current is such that it:
(A) Opposes the change causing it
(B) Supports the change causing it
(C) Is perpendicular to the change causing it
(D) None of these
✅ Answer: (A) Opposes the change causing it
📌 Explanation: Lenz's Law states that the induced current opposes the change in magnetic flux that produces it.
Q8. The SI unit of magnetic flux is:
(A) Tesla
(B) Weber
(C) Henry
(D) Gauss
✅ Answer: (B) Weber
📌 Explanation: Magnetic flux Φ = B × A, measured in Weber (Wb).
📌 Semiconductor Electronics – MCQs for Competitive Exams
Q9. A diode allows current to flow in:
(A) Forward direction only
(B) Reverse direction only
(C) Both directions equally
(D) None of these
✅ Answer: (A) Forward direction only
📌 Explanation: A diode conducts current in forward bias and blocks it in reverse bias.
Q10. A transistor is used as:
(A) Amplifier
(B) Switch
(C) Oscillator
(D) All of the above
✅ Answer: (D) All of the above
📌 Explanation: Transistors can amplify signals, act as a switch, and generate oscillations in circuits.
📌 Modern Physics – Advanced PYQs & MCQs
Q11. The work function of a metal is the:
(A) Energy needed to remove an electron from the surface
(B) Energy required to excite an electron inside the metal
(C) Energy required to produce X-rays
(D) Energy needed to break metallic bonds
✅ Answer: (A) Energy needed to remove an electron from the surface
📌 Explanation: Work function (Φ) is the minimum energy needed to eject an electron from a metal surface.
Q12. The mass-energy equivalence equation was given by:
(A) E = mc²
(B) E = hf
(C) PV = nRT
(D) W = F × d
✅ Answer: (A) E = mc²
📌 Explanation: Einstein's equation states that mass can be converted into energy.
📌 Nuclear Physics – MCQs & PYQs
Q13. The splitting of a heavy nucleus into two lighter nuclei is called:
(A) Nuclear Fusion
(B) Nuclear Fission
(C) Radioactivity
(D) Ionization
✅ Answer: (B) Nuclear Fission
📌 Explanation: Nuclear fission occurs in atomic bombs and nuclear reactors.
Q14. A neutron has:
(A) Positive charge
(B) Negative charge
(C) No charge
(D) Double positive charge
✅ Answer: (C) No charge
📌 Explanation: Neutrons are neutral particles found in the nucleus of an atom.
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📌 Conclusion – Master Physics for Competitive Exams!
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📢 Next Part Coming Soon – Advanced Numerical MCQs & Theoretical Questions for Physics! 🚀
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