Physics MCQs

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Physics MCQs

Practice the latest Physics MCQs with answers and detailed explanations. This section includes chapter-wise multiple-choice questions covering mechanics, motion, force, work and energy, heat, light, electricity, magnetism, modern physics, waves, optics, and other important topics. These exam-oriented MCQs are ideal for Class 9–12, NEET, JEE, CUET, SSC, Banking, Railway, JKSSB, Defence, Police, and other competitive exams.

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Total Questions

Practice Questions

Page 54 of 65
Question #1061
Capacitor charging work stored as:
A. Magnetic energy
B. Chemical energy
C. Heat
D. Electrostatic energy
Discuss
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Correct Answer: Option D

Explanation:
Work done stored in electric field between plates: U = ½CV². Recoverable on discharge. Memory aid: 'Capacitor energy = ½CV² in electric field'. Electrostatics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1062
Beats used for:
A. Instrument tuning
B. Sound speed measurement
C. Neither
D. Both
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Correct Answer: Option D

Explanation:
Beats: tune instruments (zero beat = matched frequency); measure sound speed via known frequency difference. Memory tip: 'Beats: tuning and measurement applications'. Wave phenomenon application frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1063
Gravitational constant G dimensions:
A. [M⁰L⁰T⁰]
B. [M⁻¹L²T⁻²]
C. [M⁻¹L³T⁻²]
D. [ML³T⁻²]
Discuss
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Correct Answer: Option C

Explanation:
F = Gm₁m₂/r² ⇒ G = Fr²/(m₁m₂) = [MLT⁻²][L²]/[M²] = [M⁻¹L³T⁻²]. Memory aid: 'G dimensions: [M⁻¹L³T⁻²]; small value reflects weak gravity'. Dimensional analysis frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1064
Uniform acceleration: v-t graph is:
A. Straight line with slope
B. Hyperbola
C. Parabola
D. Horizontal line
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Correct Answer: Option A

Explanation:
a = constant ⇒ v = u + at (linear in t). Slope = acceleration. Memory tip: 'v-t slope = acceleration; area = displacement'. Graph interpretation frequently tested in competitive kinematics sections.
This question belongs to: Science Physics
Question #1065
TIR used in:
A. Diamond brilliance
B. Optical fibers
C. Neither
D. Both
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Correct Answer: Option D

Explanation:
Optical fibers: TIR confines light in core. Diamonds: high n gives small θ_c, causing multiple TIRs for sparkle. Memory aid: 'TIR applications: fibers (communication), diamonds (optics)'. Optics application frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1066
Carnot efficiency depends on:
A. Working substance
B. Source and sink temperatures only
C. Both (a) and (b)
D. Engine size
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Correct Answer: Option B

Explanation:
η = 1 - T₂/T₁: depends only on absolute temperatures, independent of working fluid or design. Universal maximum efficiency limit. Memory tip: 'Carnot: only T_hot and T_cold matter; real engines less efficient'. Thermodynamics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1067
Spring-mass period in orbiting satellite:
A. Infinite
B. Zero
C. Same as Earth
D. Depends on orbit
Discuss
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Correct Answer: Option C

Explanation:
T = 2π√(m/k): depends on mass and spring constant only, not gravity. Weightlessness doesn't affect spring force. Memory aid: 'Spring period: independent of g; pendulum period: depends on g'. Oscillations concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1068
Diffraction limits resolution because:
A. Lenses absorb light
B. Mirrors reflect poorly
C. Light bends around edges, blurring images
D. Atmosphere distorts
Discuss
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Correct Answer: Option C

Explanation:
Diffraction spreads light through apertures, creating Airy patterns instead of points. Fundamental limit: θ_min ≈ 1.22λ/D (Rayleigh criterion). Memory tip: 'Diffraction limit: smaller λ or larger aperture ⇒ better resolution'. Wave optics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1069
Conservative force work over closed path:
A. Positive
B. Negative
C. Zero
D. Path dependent
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Correct Answer: Option C

Explanation:
Conservative forces (gravity, spring): work path-independent ⇒ ∮F·dr = 0 over closed loop. Enables potential energy definition. Memory aid: 'Conservative: ∮F·dr = 0; enables energy conservation'. Mechanics foundation frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1070
Polarization impossible in:
A. Radio waves
B. Sound in air
C. Light
D. X-rays
Discuss
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Correct Answer: Option B

Explanation:
Polarization requires transverse waves. Sound in air is longitudinal (oscillations ∥ propagation) ⇒ cannot be polarized. EM waves (light, radio, X-rays) are transverse ⇒ can be polarized. Memory tip: 'Polarization ⇒ transverse only; sound = longitudinal ⇒ no polarization'. Wave property frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1071
Free fall: height h takes time t. Height 4h takes time:
A. 4t
B. 2t
C. t/2
D. t
Discuss
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Correct Answer: Option B

Explanation:
h = ½gt² ⇒ t ∝ √h. If h' = 4h, t' = √4 × t = 2t. Time doubles when height quadruples. Memory aid: 'Free fall: t ∝ √h; 4× height ⇒ 2× time'. Kinematics proportionality frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1072
LCR resonance condition:
A. R = 0
B. f = 0
C. X_L = X_C
D. Z maximum
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Correct Answer: Option C

Explanation:
Resonance: ωL = 1/(ωC) ⇒ ω = 1/√(LC). At this frequency, impedance minimum (Z=R), current maximum. Memory tip: 'Resonance: X_L = X_C; series: Z_min, current max'. AC circuit concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1073
Latent heat of fusion ice = 336 kJ/kg. Heat to melt 3 kg ice at 0°C:
A. 672 kJ
B. 1008 kJ
C. 112 kJ
D. 336 kJ
Discuss
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Correct Answer: Option B

Explanation:
Q = mL = 3×336 = 1008 kJ. Direct latent heat formula application. Memory tip: 'Phase change: Q = mL; no temperature change'. Calorimetry calculation frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1074
Dispersion occurs because:
A. Different frequencies
B. Different colors have different speeds in medium
C. Prism absorbs colors
D. TIR occurs
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Correct Answer: Option B

Explanation:
n varies with λ ⇒ v = c/n varies ⇒ different refraction angles (Snell's law). Frequency constant; wavelength changes in medium. Memory aid: 'Dispersion: n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Optics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1075
Pendulum T measured 2.0±0.1 s. % error in g:
A. 20%
B. 5%
C. 10%
D. 2.5%
Discuss
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Correct Answer: Option C

Explanation:
g = 4π²l/T² ⇒ %Δg = %Δl + 2×%ΔT. Assuming l precise: %Δg ≈ 2×(0.1/2.0×100%) = 2×5% = 10%. Memory tip: 'g ∝ 1/T² ⇒ %Δg = 2×%ΔT'. Error analysis frequently tested in competitive experimental physics sections.
This question belongs to: Science Physics
Question #1076
Electromagnetic induction basis for:
A. Transformer
B. Motor
C. Generator
D. Both (b) and (c)
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Correct Answer: Option D

Explanation:
Induction (changing flux ⇒ EMF): generators (motion ⇒ electricity), transformers (AC voltage conversion). Motors use reverse principle (force on current in field). Memory aid: 'Induction: generators, transformers; motors: Lorentz force'. Device principle frequently tested in competitive electromagnetism sections.
This question belongs to: Science Physics
Question #1077
Work per unit charge to move between points is:
A. Electric potential
B. Potential energy
C. Electric field
D. Capacitance
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Correct Answer: Option A

Explanation:
Potential difference V = W/q: work per unit charge. Electric field E = F/q: force per unit charge. Memory tip: 'Potential = work/charge (scalar); Field = force/charge (vector)'. Electrostatics definition frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1078
Beats observable when frequencies are:
A. Any values
B. Very different
C. Slightly different
D. Identical
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Correct Answer: Option C

Explanation:
Beats: interference of close frequencies (Δf small, typically
This question belongs to: Science Physics
Question #1079
Geostationary satellite period:
A. 12 hours
B. 24 hours
C. Variable
D. 84 minutes
Discuss
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Correct Answer: Option B

Explanation:
Geostationary: orbit period = Earth's rotation period (24 h), equatorial plane, appears fixed. Orbital radius ≈ 42,000 km from Earth center. Memory tip: 'Geostationary: T=24h, equatorial, fixed position; communication satellites'. Orbital mechanics fact frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1080
TIR requires light travel from:
A. Water to glass
B. Glass to air
C. Any to vacuum
D. Air to glass
Discuss
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Correct Answer: Option B

Explanation:
TIR: denser→rarer medium AND incidence angle > critical angle. Glass to air satisfies first condition; angle must exceed θ_c. Memory aid: 'TIR: n₁>n₂ AND i>θ_c; direction matters'. Optics condition frequently tested in competitive exams.
This question belongs to: Science Physics

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