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Physics MCQs

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81
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

  • A Refraction
  • B Reflection
  • C Diffraction
  • D Dispersion
Permalink
Correct Answer: Option C — Diffraction
Explanation: Diffraction is the bending of light waves around the edges of an obstacle or through an aperture and is most noticeable when the obstacle size is comparable to the wavelength.
Submitted by: PaperMCQs
82
Medium ppsc Uploaded: 06 Aug 2026

What is the unit of capacitance?

  • A Farad
  • B Henry
  • C Ohm
  • D Weber
Permalink
Correct Answer: Option A — Farad
Explanation: The Farad (F) is the SI unit of electrical capacitance, named after Michael Faraday. It measures a capacitor's ability to store electric charge per unit voltage, with most practical capacitors having capacitance values in microfarads or picofarads.
Submitted by: PaperMCQs
83
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of radiation has the highest penetrating power?

  • A Alpha radiation
  • B Gamma radiation
  • C Beta radiation
  • D Neutron radiation
Permalink
Correct Answer: Option B — Gamma radiation
Explanation: Gamma radiation is highly penetrating electromagnetic radiation that can pass through most materials and requires dense materials like thick lead or concrete for adequate shielding.
Submitted by: PaperMCQs
84
Medium fpsc Uploaded: 06 Aug 2026

What is the term for the maximum displacement of a wave from its rest position?

  • A Wavelength
  • B Frequency
  • C Amplitude
  • D Period
Permalink
Correct Answer: Option C — Amplitude
Explanation: Amplitude represents the maximum displacement of particles from their equilibrium position as a wave passes through a medium. Greater amplitude corresponds to louder sound or brighter light, depending on the type of wave involved.
Submitted by: PaperMCQs
85
Medium nts Uploaded: 06 Aug 2026

What is the term for the amount of matter contained in an object?

  • A Weight
  • B Volume
  • C Density
  • D Mass
Permalink
Correct Answer: Option D — Mass
Explanation: Mass is the quantity of matter contained within an object, remaining constant regardless of location. Unlike weight, which varies with gravitational pull, mass is measured in kilograms and represents a fundamental property of matter.
Submitted by: PaperMCQs
86
Medium ppsc Uploaded: 17 Aug 2026

A p-type semiconductor has an excess of:

  • A Electrons
  • B Protons
  • C Neutrons
  • D Holes
Permalink
Correct Answer: Option D — Holes
Explanation: A p-type semiconductor is created by doping a pure semiconductor with acceptor impurities that create an excess of positively charged holes, which act as the majority charge carriers in the material.
Submitted by: PaperMCQs
87
Medium css Uploaded: 06 Aug 2026

Which type of mirror is used in vehicle headlights to focus light?

  • A Plane mirror
  • B Convex mirror
  • C Cylindrical mirror
  • D Concave mirror
Permalink
Correct Answer: Option D — Concave mirror
Explanation: Concave mirrors are used in vehicle headlights because they can focus and direct parallel beams of light forward efficiently. Their curved reflective surface converges light rays, producing a strong, concentrated beam for illumination.
Submitted by: PaperMCQs
88
Medium fpsc Uploaded: 17 Aug 2026

Which law states that induced EMF is proportional to the rate of change of magnetic flux?

  • A Coulomb's law
  • B Faraday's law
  • C Lenz's law
  • D Ohm's law
Permalink
Correct Answer: Option B — Faraday's law
Explanation: Faraday's law of electromagnetic induction states that the induced electromotive force in a circuit is directly proportional to the rate of change of magnetic flux through that circuit over time.
Submitted by: PaperMCQs
89
Medium pms Uploaded: 06 Aug 2026

Which law states that current through a conductor is directly proportional to voltage at constant temperature?

  • A Faraday's Law
  • B Coulomb's Law
  • C Ohm's Law
  • D Lenz's Law
Permalink
Correct Answer: Option C — Ohm's Law
Explanation: Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, provided temperature remains constant. This relationship is expressed mathematically as voltage equals current times resistance.
Submitted by: PaperMCQs
90
Medium nts Uploaded: 17 Aug 2026

The neutron was discovered by:

  • A Ernest Rutherford
  • B J.J. Thomson
  • C Marie Curie
  • D James Chadwick
Permalink
Correct Answer: Option D — James Chadwick
Explanation: James Chadwick discovered the neutron in 1932, identifying it as an electrically neutral subatomic particle residing in the nucleus alongside protons, for which he was later awarded the Nobel Prize.
Submitted by: PaperMCQs
91
Medium css Uploaded: 17 Aug 2026

The coefficient of friction depends upon:

  • A Velocity of the body
  • B Mass of the body
  • C Area of contact
  • D Nature of the surfaces in contact
Permalink
Correct Answer: Option D — Nature of the surfaces in contact
Explanation: The coefficient of friction is a dimensionless value that depends primarily on the roughness and material properties of the two surfaces in contact, not on the apparent contact area or the object's mass.
Submitted by: PaperMCQs
92
Medium css Uploaded: 17 Aug 2026

The energy stored in a capacitor is given by the formula:

  • A CV
  • B (1/2)CV^2
  • C C/V
  • D V/C
Permalink
Correct Answer: Option B — (1/2)CV^2
Explanation: The electrical energy stored in a charged capacitor is given by the formula one-half times capacitance times voltage squared, representing the work done to charge the capacitor to that voltage.
Submitted by: PaperMCQs
93
Medium css Uploaded: 06 Aug 2026

Which phenomenon causes a rainbow to form after rainfall?

  • A Reflection only
  • B Diffraction only
  • C Refraction and dispersion
  • D Polarization
Permalink
Correct Answer: Option C — Refraction and dispersion
Explanation: Rainbows form when sunlight enters raindrops, refracts, reflects internally, and disperses into its component colors as it exits. This combination of refraction and dispersion separates white light into the familiar spectrum of colors.
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94
Medium pms Uploaded: 17 Aug 2026

Ultrasonic waves have frequencies:

  • A Below 20 Hz
  • B Exactly 20,000 Hz
  • C Between 20 Hz and 20,000 Hz
  • D Above 20,000 Hz
Permalink
Correct Answer: Option D — Above 20,000 Hz
Explanation: Ultrasonic waves are sound waves with frequencies higher than 20,000 Hz, beyond the upper limit of human hearing, and they are widely used in medical imaging, sonar, and industrial cleaning applications.
Submitted by: PaperMCQs
95
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the formula for kinetic energy?

  • A mv
  • B mgh
  • C half mv squared
  • D Fxd
Permalink
Correct Answer: Option C — half mv squared
Explanation: Kinetic energy is calculated using the formula KE equals half multiplied by mass multiplied by velocity squared showing that kinetic energy increases with the square of speed.
Submitted by: PaperMCQs
96
Medium nts Uploaded: 17 Aug 2026

The value of the universal gravitational constant G is approximately:

  • A 3 x 10^8 m/s
  • B 1.6 x 10^-19 C
  • C 6.67 x 10^-11 N m^2/kg^2
  • D 9.8 m/s^2
Permalink
Correct Answer: Option C — 6.67 x 10^-11 N m^2/kg^2
Explanation: The universal gravitational constant G has an approximate value of 6.67 x 10^-11 N m^2/kg^2, and it appears in Newton's law of gravitation to relate force, mass, and distance between two bodies.
Submitted by: PaperMCQs
97
Medium ppsc Uploaded: 06 Aug 2026

Which principle explains how airplanes generate lift?

  • A Bernoulli's Principle
  • B Pascal's Principle
  • C Archimedes' Principle
  • D Newton's First Law
Permalink
Correct Answer: Option A — Bernoulli's Principle
Explanation: Bernoulli's Principle explains that faster-moving air over the curved upper surface of a wing creates lower pressure compared to the slower air beneath it, generating lift. This pressure difference, combined with airflow deflection, allows airplanes to fly.
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98
Medium pms Uploaded: 17 Aug 2026

The mathematical form of Ohm's law is:

  • A V = I/R
  • B V = I + R
  • C V = IR
  • D V = I - R
Permalink
Correct Answer: Option C — V = IR
Explanation: Ohm's law is mathematically expressed as V equals I multiplied by R, where V is voltage in volts, I is current in amperes, and R is resistance in ohms, for most conductors at constant temperature.
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99
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which formula correctly represents the relationship between frequency wavelength and speed of a wave?

  • A v equals f divided by wavelength
  • B v equals wavelength divided by f
  • C v equals f times wavelength
  • D f equals v times wavelength
Permalink
Correct Answer: Option C — v equals f times wavelength
Explanation: The wave equation states that wave speed v equals frequency f multiplied by wavelength lambda showing that for a given medium as frequency increases wavelength decreases proportionally.
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100
Medium fpsc Uploaded: 06 Aug 2026

Which law states that an object at rest stays at rest unless acted upon by an external force?

  • A Newton's Second Law
  • B Newton's Third Law
  • C Law of Inertia and Momentum
  • D Newton's First Law
Permalink
Correct Answer: Option D — Newton's First Law
Explanation: Newton's First Law, also called the law of inertia, states that an object remains at rest or continues moving at constant velocity unless acted upon by an unbalanced external force, describing the natural resistance to change in motion.
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