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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Page 14 of 65
Question #261
Ultrasound frequencies are typically above
A. 20 Hz
B. 20000 Hz
C. 2000 Hz
D. 200 Hz
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Correct Answer: Option B

Explanation:
Human hearing range is about 20 Hz to 20 kHz. Sound above 20 kHz is ultrasound. Infrasound is below 20 Hz. Ultrasound used in medical imaging (sonography), cleaning, SONAR.
This question belongs to: Science Physics
Question #262
The angle of incidence for a light ray is 30°. According to laws of reflection, angle of reflection is
A. 90°
B. 30°
C. 15°
D. 60°
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Correct Answer: Option B

Explanation:
Law of reflection: angle of incidence = angle of reflection, both measured from normal. So 30°. If angle with mirror is given, convert to normal. Always equal for smooth surfaces.
This question belongs to: Science Physics
Question #263
A convex mirror of focal length f forms an image of a distant object. The image is
A. Real, erect, enlarged
B. Real, inverted, diminished
C. Virtual, inverted, enlarged
D. Virtual, erect, diminished
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Correct Answer: Option D

Explanation:
Convex mirror diverges light, forms virtual, erect, diminished image behind mirror for any object position. Focal length positive by sign convention but image always virtual (upright). Used in rear-view mirrors.
This question belongs to: Science Physics
Question #264
The power of a lens is +2 D. Its focal length is
A. 2 m
B. 50 cm
C. 20 cm
D. 0.5 m
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Correct Answer: Option D

Explanation:
Power P = 1/f (in metre). f = 1/P = 1/2 = 0.5 m = 50 cm. Positive power indicates convex lens. For concave lens, power negative. Dioptre (D) is SI unit of power. Remember f in metres.
This question belongs to: Science Physics
Question #265
Myopia (nearsightedness) is corrected by using
A. Bifocal lens
B. Concave lens
C. Cylindrical lens
D. Convex lens
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Correct Answer: Option B

Explanation:
Myopic eye focuses image in front of retina. A diverging (concave) lens spreads light so image falls on retina. Hypermetropia (farsightedness) corrected by convex lens. Bifocals for presbyopia. Cylindrical for astigmatism.
This question belongs to: Science Physics
Question #266
Dispersion of white light through a prism occurs because
A. Different colours have same speed in glass
B. Prism absorbs colours
C. White light is composed of seven colours
D. Refractive index is different for different colours
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Correct Answer: Option D

Explanation:
Dispersion is splitting of light into constituent colours due to variation of refractive index with wavelength. Violet deviates most, red least. Prism doesn't absorb but disperses. Rainbow formation is due to dispersion, refraction, reflection in water droplets.
This question belongs to: Science Physics
Question #267
Rainbow is formed due to
A. Dispersion and internal reflection
B. Comet
C. Total internal reflection
D. Diffraction
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Correct Answer: Option A

Explanation:
Rainbow is formed by dispersion, refraction, and internal reflection of sunlight in water droplets. Two refractions and one internal reflection give primary bow. Secondary bow has two internal reflections. Not diffraction.
This question belongs to: Science Physics
Question #268
Ohm's law is valid for
A. All conductors
B. Electrolytes
C. Semiconductors only
D. Metallic conductors at constant temperature
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Correct Answer: Option D

Explanation:
Ohm's law V = IR holds for ohmic conductors (metals) provided temperature and physical conditions constant. Non-ohmic: semiconductors, diodes, electrolytes. Graph V-I is straight line for ohmic. Temperature changes resistance, so condition necessary.
This question belongs to: Science Physics
Question #269
Two resistors 3 Ω and 6 Ω are connected in parallel. The equivalent resistance is
A. 2 Ω
B. 1 Ω
C. 9 Ω
D. 3 Ω
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Correct Answer: Option A

Explanation:
For parallel: 1/R = 1/3 + 1/6 = (2+1)/6 = 3/6 = 1/2 => R = 2 Ω. Product/sum rule for two: (3×6)/(3+6)=18/9=2 Ω. Always less than smallest resistance.
This question belongs to: Science Physics
Question #270
A 100 W bulb operates at 200 V. Its resistance is
A. 200 Ω
B. 100 Ω
C. 400 Ω
D. 50 Ω
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Correct Answer: Option C

Explanation:
Power P = V²/R => R = V²/P = 200²/100 = 40000/100 = 400 Ω. Also current I = P/V = 0.5 A, R = V/I = 200/0.5 = 400 Ω. Use P = V²/R for direct calculation.
This question belongs to: Science Physics
Question #271
The heating effect of electric current is utilised in
A. Electric fuse
B. Electric motor
C. Galvanometer
D. Electric generator
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Correct Answer: Option A

Explanation:
Fuse uses heating effect (Joule heating I²R). When current exceeds limit, fuse wire melts due to heat, breaking circuit. Motor uses magnetic effect, generator uses electromagnetic induction, galvanometer detects current. Iron box, heater also use heating effect.
This question belongs to: Science Physics
Question #272
Two 100 W, 200 V bulbs are connected in series across 200 V supply. Total power consumed is
A. 50 W
B. 100 W
C. 25 W
D. 200 W
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Correct Answer: Option A

Explanation:
Each bulb resistance R = V²/P = 40000/100 = 400 Ω. In series, total R = 800 Ω. Total power P_total = V²/(total R) = 200²/800 = 40000/800 = 50 W. So each bulb gets 25 W. Series reduces power.
This question belongs to: Science Physics
Question #273
The SI unit of electric charge is
A. Coulomb
B. Volt
C. Ohm
D. Ampere
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Correct Answer: Option A

Explanation:
Coulomb (C) is SI unit of charge. Ampere is unit of current (C/s). Volt is potential difference, ohm is resistance. One coulomb is charge transported by 1 A current in 1 s.
This question belongs to: Science Physics
Question #274
A magnetic field line indicates
A. Path of charged particle
B. Direction of force on a north pole
C. Direction of current
D. Direction of electric field
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Correct Answer: Option B

Explanation:
Magnetic field lines represent direction of force on an isolated north pole. They emerge from north and enter south. They never cross. Tangent gives field direction. Compass aligns along these lines.
This question belongs to: Science Physics
Question #275
The working of an electric motor is based on
A. Chemical effect of current
B. Heating effect of current
C. Electromagnetic induction
D. Magnetic effect of current
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Correct Answer: Option D

Explanation:
Motor converts electrical to mechanical energy using force on a current-carrying conductor in magnetic field (F = BIL). Electromagnetic induction is for generator. Motor principle: A current-carrying coil experiences torque in magnetic field.
This question belongs to: Science Physics
Question #276
A step-up transformer increases
A. Power
B. Current
C. Energy
D. Voltage
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Correct Answer: Option D

Explanation:
Step-up transformer increases voltage and decreases current proportionally (P = V×I constant ideal). Power constant (ignoring losses). Used in power transmission to reduce I²R losses. Step-down decreases voltage.
This question belongs to: Science Physics
Question #277
Electromagnetic induction was discovered by
A. Ampere
B. Oersted
C. Coulomb
D. Faraday
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Correct Answer: Option D

Explanation:
Michael Faraday discovered electromagnetic induction in 1831: changing magnetic field induces emf. Oersted discovered magnetic effect of current. Ampere gave laws of magnetic force between currents. Coulomb for electrostatics.
This question belongs to: Science Physics
Question #278
A bar magnet is cut into two equal parts transversely. The pole strength of each piece becomes
A. Half
B. Zero
C. Double
D. Same
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Correct Answer: Option D

Explanation:
Pole strength is a property of the magnet; when cut transversely, each piece still has both north and south poles with same pole strength as original. Magnetic moment becomes half because length halves. Each is a complete magnet.
This question belongs to: Science Physics
Question #279
Which of the following is a vector quantity?
A. Magnetic flux
B. Resistance
C. Electric potential
D. Magnetic field intensity
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Correct Answer: Option D

Explanation:
Magnetic field intensity (H) and magnetic field (B) are vectors. Magnetic flux is scalar (Φ = B·A). Resistance scalar, potential scalar. Vector quantities have direction. Current has direction but adds by scalar law, considered tensor sometimes but in basic physics not vector.
This question belongs to: Science Physics
Question #280
The core of a transformer is laminated to reduce
A. Flux leakage
B. Eddy current loss
C. Copper loss
D. Hysteresis loss
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Correct Answer: Option B

Explanation:
Lamination of core increases resistance to circulating eddy currents, reducing eddy current losses (I²R). Hysteresis loss reduced by using soft iron. Copper loss is in windings. Lamination is insulation between layers.
This question belongs to: Science Physics

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