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 9ā€“12, NEET, JEE, CUET, SSC, Banking, Railway, JKSSB, Defence, Police, and other competitive exams.

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Practice Questions

Page 52 of 65
Question #1021
Glass slab: emergent ray is:
A. Reversed
B. Parallel to incident with lateral shift
C. Perpendicular
D. Deviated
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Correct Answer: Option B

Explanation:
Parallel-faced slab: refraction at entry and exit cancel angular deviation, but ray shifts laterally. No net direction change. Memory tip: 'Slab: parallel emergent ray; Prism: deviated emergent ray'. Ray optics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1022
SI unit of luminous intensity:
A. Lumen
B. Candela
C. Lux
D. Watt
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Correct Answer: Option B

Explanation:
Candela (cd) is SI base unit for luminous intensity. Lumen: luminous flux; Lux: illuminance; Watt: power. Memory aid: 'Candela = candle power; base unit for perceived light'. Unit knowledge frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1023
Microscope resolution improved by:
A. Oil immersion
B. Lower magnification
C. Smaller numerical aperture
D. Longer wavelength light
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Correct Answer: Option A

Explanation:
Oil immersion increases numerical aperture (NA) by matching refractive indices, improving resolution d = Ī»/(2NA). Memory tip: 'Higher NA or shorter Ī» ā‡’ better resolution'. Optical instrument concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1024
Beats frequency = |fā‚ - fā‚‚|. For 256 Hz and 260 Hz, beats per second:
A. 258
B. 2
C. 4
D. 516
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Correct Answer: Option C

Explanation:
Beat frequency = |260 - 256| = 4 Hz ā‡’ 4 beats/second. Interference of close frequencies causes amplitude modulation. Memory aid: 'Beats = frequency difference; used in tuning instruments'. Wave interference calculation frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1025
Angular momentum dimensions:
A. [MLTā»Ā¹]
B. [MLĀ²Tā»Ā¹]
C. [MLĀ²Tā»Ā²]
D. [Mā°Lā°Tā°]
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Correct Answer: Option B

Explanation:
L = r Ɨ p: [L][MLTā»Ā¹] = [MLĀ²Tā»Ā¹]. Same as Planck's constant. Memory tip: 'Angular momentum: [MLĀ²Tā»Ā¹]; action quantities share dimensions'. Dimensional analysis frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1026
Projectile peak: velocity and acceleration are:
A. Both zero
B. v=0, a=g downward
C. Both max
D. v max, a=0
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Correct Answer: Option B

Explanation:
At maximum height, vertical velocity = 0 momentarily, but acceleration = g downward throughout motion. Memory tip: 'Peak: v=0, a=g; gravity never switches off'. Kinematics concept frequently tested to correct misconception that acceleration vanishes at peak.
This question belongs to: Science Physics
Question #1027
Refrigerator COP = Qā‚‚/W. If Qā‚‚=300J, W=100J, COP is:
A. 0.33
B. 400
C. 200
D. 3
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Correct Answer: Option D

Explanation:
COP = desired output/work input = 300/100 = 3. Typical COP > 1 for refrigerators. Memory aid: 'COP = cooling effect per work; higher = more efficient'. Thermodynamics calculation frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1028
EM wave: E and B fields are:
A. Parallel to propagation
B. Random
C. Parallel
D. Perpendicular to each other and propagation
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Correct Answer: Option D

Explanation:
EM waves transverse: E āŠ„ B āŠ„ propagation direction. Derived from Maxwell's equations. Memory tip: 'EM wave: right-hand rule for EƗB direction'. Wave property frequently tested in competitive modern physics sections.
This question belongs to: Science Physics
Question #1029
TIR condition: light travels from:
A. Denser to rarer with i > Īø_c
B. Vacuum to medium
C. Rarer to denser
D. Any media at any angle
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Correct Answer: Option A

Explanation:
Total internal reflection requires: (1) denserā†’rarer medium, (2) incidence angle > critical angle. Memory aid: 'TIR: nā‚>nā‚‚ AND i>Īø_c'. Optics condition frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1030
Photon energy E = hĪ½. For higher frequency light, photon energy is:
A. Same
B. Zero
C. Higher
D. Lower
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Correct Answer: Option C

Explanation:
E āˆ Ī½: higher frequency ā‡’ higher photon energy. Gamma rays (high Ī½) more energetic than radio waves (low Ī½). Memory aid: 'E = hĪ½; blue light photons more energetic than red'. Quantum physics relation frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1031
Wire stretched to double length (volume constant). New resistance:
A. R/2
B. R
C. 4R
D. 2R
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Correct Answer: Option C

Explanation:
Volume constant: A' = A/2 when L' = 2L. R' = Ļ(2L)/(A/2) = 4ĻL/A = 4R. Memory tip: 'Stretch wire: R āˆ LĀ² when volume fixed'. Resistance proportionality frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1032
Momentum conservation follows from:
A. Energy conservation
B. Newton's second law
C. Newton's first law
D. Newton's third law
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Correct Answer: Option D

Explanation:
Internal forces cancel in pairs (third law), so net external force = 0 ā‡’ dp/dt = 0 (second law) ā‡’ momentum constant. Memory aid: 'Momentum conservation ā‡” no external force ā‡” action-reaction pairs'. Mechanics foundation frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1033
Mirror focal length f and radius R relation:
A. f = 2R
B. f = R/2
C. f = R
D. f = RĀ²
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Correct Answer: Option B

Explanation:
Spherical mirrors: f = R/2 under paraxial approximation. Derived from geometry of reflection. Memory tip: 'Mirror: f = R/2; sign: concave +, convex -'. Optics formula frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1034
Ideal gas internal energy depends on:
A. Volume
B. Temperature only
C. All state variables
D. Pressure
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Correct Answer: Option B

Explanation:
Ideal gas: no intermolecular forces ā‡’ internal energy = kinetic energy āˆ T. U = f/2 nRT. Memory tip: 'Ideal gas: U = U(T) only; real gases have V dependence'. Thermodynamics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1035
Sunlight travel time to Earth:
A. 8 days
B. 8 hours
C. 8 seconds
D. 8 minutes
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Correct Answer: Option D

Explanation:
Distance ā‰ˆ 1.5Ɨ10Ā¹Ā¹ m, c = 3Ɨ10āø m/s ā‡’ t = 500 s ā‰ˆ 8.3 min. Standard astronomical fact. Memory aid: 'Sunlight takes 8 minutes; we see Sun as it was 8 min ago'. Scale knowledge frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1036
Series LCR at resonance: impedance is:
A. Zero
B. Minimum (=R)
C. Maximum
D. Infinite
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Correct Answer: Option B

Explanation:
Resonance: X_L = X_C ā‡’ they cancel ā‡’ Z = R (minimum). Current maximum at resonance. Memory tip: 'Series resonance: Z_min = R; parallel: Z_max'. AC circuit concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1037
Electron e/m measured by:
A. Bohr
B. Millikan
C. Rutherford
D. Thomson
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Correct Answer: Option D

Explanation:
J.J. Thomson measured e/m using cathode ray deflection (1897). Millikan later measured e (oil drop). Memory aid: 'Thomson = e/m; Millikan = e'. Experimental physics history frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1038
Prism minimum deviation depends on:
A. Wavelength only
B. Refractive index only
C. Prism angle only
D. Both angle and n
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Correct Answer: Option D

Explanation:
Formula: n = sin[(A+Ī“_m)/2]/sin(A/2). Ī“_m depends on prism angle A and refractive index n. Memory tip: 'Ī“_m increases with A and n; used to measure n'. Optics formula frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1039
Work moving charge on equipotential surface:
A. Zero
B. Infinite
C. qV
D. Path dependent
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Correct Answer: Option A

Explanation:
Equipotential: Ī”V = 0 ā‡’ W = qĪ”V = 0. Electric field perpendicular to equipotentials. Memory aid: 'Equipotential: no work to move charge along it'. Electrostatics concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #1040
Bohr radius r_n āˆ
A. nĀ²
B. 1/n
C. n
D. 1/nĀ²
Discuss
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Correct Answer: Option A

Explanation:
Bohr model: r_n = nĀ²aā‚€ ā‡’ r āˆ nĀ². Higher n = larger orbit. Memory tip: 'Bohr: r āˆ nĀ²; E āˆ -1/nĀ²'. Atomic physics relation frequently tested in competitive exams.
This question belongs to: Science Physics

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