Physics MCQs

Science

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.

1287
Total Questions

Practice Questions

Page 50 of 65
Question #981
Electric power P = VI. For 60W, 120V bulb, current is:
A. 7200 A
B. 180 A
C. 0.5 A
D. 2 A
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
I = P/V = 60/120 = 0.5 A. Direct power formula application. Memory tip: 'I = P/V for resistive loads; always use consistent units'. Basic electricity numerical frequently tested in competitive exams to verify formula application and unit handling.
This question belongs to: Science Physics
Question #982
In parallel circuit, which quantity is same across branches?
A. Power
B. Resistance
C. Current
D. Voltage
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Parallel branches share same voltage (potential difference). Current divides inversely with resistance. Memory aid: 'Parallel: same voltage; Series: same current'. Fundamental circuit property frequently tested in competitive exams to assess basic electronics understanding.
This question belongs to: Science Physics
Question #983
Magnetic field around straight current-carrying wire is:
A. Radial
B. Parallel to wire
C. Circular concentric
D. Uniform
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Biot-Savart law: field forms concentric circles around wire, direction by right-hand thumb rule. Magnitude B = Ī¼ā‚€I/(2Ļ€r), decreasing with distance. Memory tip: 'Right-hand rule: thumb = current, fingers = field circles'. Fundamental magnetism concept frequently tested in competitive exams.
This question belongs to: Science Physics
Question #984
Electromagnetic induction principle discovered by:
A. Ampere
B. Faraday
C. Oersted
D. Volta
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Michael Faraday discovered electromagnetic induction (1831): changing magnetic flux induces EMF. Oersted found current-magnetism link; Ampere studied forces; Volta invented battery. Memory aid: 'Faraday = induction; Lenz = induced current direction'. History-based question testing key discoveries, frequently appearing in competitive exams.
This question belongs to: Science Physics
Question #985
Electric motor works on principle of:
A. Electrostatic attraction
B. Thermal expansion
C. Force on current in magnetic field
D. Electromagnetic induction
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Motor: current-carrying conductor in magnetic field experiences Lorentz force (F = ILB), causing rotation. Generator uses reverse principle (induction). Memory tip: 'Motor: electricity ā‡’ motion (force); Generator: motion ā‡’ electricity (induction)'. Device principle question frequently tested in competitive electromagnetism sections.
This question belongs to: Science Physics
Question #986
Transformer turns ratio N_p:N_s = 1:5. If V_p = 100V, V_s is:
A. 20V
B. 2500V
C. 100V
D. 500V
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
V_s/V_p = N_s/N_p ā‡’ V_s = 100Ɨ(5/1) = 500V. Step-up transformer increases voltage. Memory aid: 'Turns ratio = voltage ratio; current ratio inverse'. Direct transformer formula application frequently tested in competitive exams with ratio calculations.
This question belongs to: Science Physics
Question #987
Atom's nucleus contains:
A. Protons, neutrons, electrons
B. Electrons and protons
C. Only protons
D. Protons and neutrons
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Nucleus: protons (+) and neutrons (neutral); electrons orbit outside. Atomic number = proton count; mass number = protons + neutrons. Memory tip: 'Nucleus = nucleons (p+n); electrons in shells'. Basic atomic structure frequently tested in competitive modern physics sections.
This question belongs to: Science Physics
Question #988
Alpha particle is:
A. Photon
B. Neutron
C. Electron
D. Helium nucleus
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Alpha (Ī±) radiation: helium nucleus (Ā²Heā“, 2p+2n), +2 charge, low penetration. Beta: electrons; Gamma: photons; Neutron: neutral particle. Memory aid: 'Alpha = He nucleus; Beta = electron; Gamma = EM wave'. Radioactivity classification frequently tested in competitive exams to distinguish radiation types.
This question belongs to: Science Physics
Question #989
Nuclear fusion combines:
A. Heavy nuclei
B. Neutrons and protons
C. Light nuclei
D. Protons and electrons
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Fusion: light nuclei (e.g., hydrogen) combine to form heavier nucleus (helium), releasing energy (stars, H-bomb). Fission splits heavy nuclei (U, Pu). Memory tip: 'Fusion = joining light; Fission = splitting heavy'. Nuclear reaction concept frequently tested in competitive modern physics sections.
This question belongs to: Science Physics
Question #990
Half-life 5 days. Fraction remaining after 15 days:
A. 1/8
B. 1/3
C. 1/16
D. 1/2
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Number of half-lives n = 15/5 = 3. Fraction = (1/2)Ā³ = 1/8. Exponential decay: N = Nā‚€(1/2)^(t/T). Memory aid: 'After n half-lives: fraction = 1/2āæ'. Radioactivity calculation frequently tested in competitive exams with simple half-life arithmetic.
This question belongs to: Science Physics
Question #991
Nuclear reactor moderator function:
A. Emit neutrons
B. Shield radiation
C. Absorb neutrons
D. Slow neutrons
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Moderator (water, graphite) slows fast neutrons to thermal energies for efficient fission in U-235. Control rods absorb neutrons to regulate reaction. Memory tip: 'Moderator = neutron slower; Control rods = neutron absorber'. Reactor component function frequently tested in competitive nuclear physics questions.
This question belongs to: Science Physics
Question #992
SHM acceleration a = -Ļ‰Ā²x. Maximum acceleration occurs at:
A. Both positions
B. Extreme position
C. Neither
D. Mean position
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
a āˆ -x; magnitude maximum when |x| maximum (extremes). At mean position x=0 ā‡’ a=0. Velocity maximum at mean position. Memory aid: 'SHM: a max at extremes, v max at center'. Oscillation concept frequently tested in competitive exams to verify SHM characteristics understanding.
This question belongs to: Science Physics
Question #993
Wave speed v = 300 m/s, frequency f = 150 Hz. Wavelength Ī» is:
A. 0.5 m
B. 150 m
C. 45000 m
D. 2 m
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
v = fĪ» ā‡’ Ī» = v/f = 300/150 = 2 m. Universal wave equation application. Memory tip: 'Ī» = v/f; units: m/s Ć· Hz = m'. Basic wave property calculation frequently tested in competitive exams to verify formula application.
This question belongs to: Science Physics
Question #994
Simple pendulum period T = 2Ļ€āˆš(l/g). If length quadrupled, T becomes:
A. Same
B. Four times
C. Half
D. Double
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
T āˆ āˆšl. If l' = 4l, T' = āˆš4 Ɨ T = 2T. Period doubles when length quadruples. Memory aid: 'Pendulum: T āˆ āˆšl; 4Ɨ length ā‡’ 2Ɨ period'. Proportional reasoning frequently tested in competitive oscillations sections.
This question belongs to: Science Physics
Question #995
Instrument measuring humidity:
A. Hygrometer
B. Hydrometer
C. Barometer
D. Anemometer
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Hygrometer measures atmospheric humidity (water vapor content). Barometer: pressure; Hydrometer: liquid density; Anemometer: wind speed. Memory tip: 'Hygro = moisture; meter = measure'. Instrument identification frequently tested in competitive exams to verify practical physics knowledge.
This question belongs to: Science Physics
Question #996
Ammeter connected in circuit:
A. Either
B. Series
C. Parallel
D. Across power supply
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
Ammeter measures current, must be in series so same current flows through it. Low resistance minimizes circuit disturbance. Voltmeter connects in parallel. Memory aid: 'Ammeter = series (low R); Voltmeter = parallel (high R)'. Circuit connection rule frequently tested in competitive electricity sections.
This question belongs to: Science Physics
Question #997
LED working principle:
A. Phosphorescence
B. Electroluminescence
C. Incandescence
D. Fluorescence
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option B

Explanation:
LED: electroluminescence - electron-hole recombination in semiconductor emits photons. Incandescence: thermal radiation (bulbs); Fluorescence: UV excitation. Memory tip: 'LED = semiconductor light emission; no filament, efficient'. Modern device principle frequently tested in competitive exams linking physics to technology.
This question belongs to: Science Physics
Question #998
Solar cell converts:
A. Chemical to electricity
B. Heat to electricity
C. Light to electricity
D. Mechanical to electricity
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option C

Explanation:
Photovoltaic effect: photons excite electrons in semiconductor, creating voltage. Direct light-to-electricity conversion. Memory tip: 'Photo = light; voltaic = electricity'. Renewable energy principle frequently tested in competitive exams to assess energy conversion understanding.
This question belongs to: Science Physics
Question #999
Fuse protects circuit by:
A. Melting on overcurrent
B. Limiting voltage
C. Storing energy
D. Amplifying signal
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option A

Explanation:
Fuse wire melts when current exceeds rating (Joule heating IĀ²R), breaking circuit to prevent damage. Sacrificial overcurrent protection. Memory aid: 'Fuse = thermal cutoff; rated current slightly above normal'. Safety device function frequently tested in competitive electricity sections.
This question belongs to: Science Physics
Question #1000
Newton's contribution to physics:
A. Electromagnetic theory
B. Theory of relativity
C. Quantum mechanics
D. Laws of motion and gravitation
Discuss
Get Complete Subject PDF for Science

Correct Answer: Option D

Explanation:
Isaac Newton: three laws of motion, universal gravitation, calculus, optics. Relativity: Einstein; EM theory: Maxwell; Quantum: Planck/Bohr. Memory tip: 'Newton = classical mechanics foundation'. Scientist-discovery association frequently tested in competitive exams.
This question belongs to: Science Physics

More Science Topics

Biology MCQs
chemistry MCQs
Today's Top Topics
Biology 2054 Physics 1287 chemistry 1089
Explore Subjects
Geography GK 6121 Static General Knowledge 6362 Maths 5575 Economy GK 2220 English 15164
Practice Mix
Select the most appropriate meaning of the idiom: 'A queer fish'.
x86-64 is also known as:
My eyes are tired because I ___ on the computer for hours.
He stands ___ the door.
Which railway system is designed exclusively for urban mass rapid transport?