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Physics MCQs

67 Questions Subject Test
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Practice core concepts of measurement, motion, force, energy, waves, electricity, magnetism and modern physics.

MechanicsWavesElectricityModern Physics
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1
Easy pms Uploaded: 06 Aug 2026

What is the term for the bending of light as it passes from one medium to another?

  • A Reflection
  • B Diffraction
  • C Dispersion
  • D Refraction
Permalink
Correct Answer: Option D — Refraction
Explanation: Refraction occurs when light changes speed and direction as it passes between media of different densities, such as air and water. This bending effect explains why a straw appears bent when partially submerged in water.
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2
Medium pms Uploaded: 17 Aug 2026

Which mirror is used as a rear-view mirror in vehicles?

  • A Plane mirror
  • B Cylindrical mirror
  • C Convex mirror
  • D Concave mirror
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Correct Answer: Option C — Convex mirror
Explanation: A convex mirror is used as a rear-view mirror in vehicles because it produces a diminished, upright, virtual image and provides a wider field of view compared to a flat plane mirror.
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3
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The transfer of heat through fluids due to the actual movement of the fluid particles is called:

  • A Conduction
  • B Radiation
  • C Insulation
  • D Convection
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Correct Answer: Option D — Convection
Explanation: Convection is the process of heat transfer that occurs due to the bulk movement of fluid particles, carrying thermal energy from warmer regions to cooler regions within liquids or gases.
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4
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What is the term for the electrical potential difference between two points in a circuit?

  • A Current
  • B Resistance
  • C Voltage
  • D Power
Permalink
Correct Answer: Option C — Voltage
Explanation: Voltage, also known as electric potential difference, represents the energy per unit charge required to move electric charge between two points in a circuit. It drives current flow through a conductor when a complete circuit exists.
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5
Easy pms Uploaded: 17 Aug 2026

Which of Newton's laws explains the concept of inertia?

  • A Law of gravitation
  • B Third law
  • C Second law
  • D First law
Permalink
Correct Answer: Option D — First law
Explanation: Newton's first law states that an object remains at rest or in uniform motion unless acted upon by an external force, which is the fundamental definition of inertia, the resistance of a body to change its state of motion.
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6
Hard pms Uploaded: 17 Aug 2026

Which particle carries a negative electric charge?

  • A Positron
  • B Electron
  • C Neutron
  • D Proton
Permalink
Correct Answer: Option B — Electron
Explanation: The electron is a subatomic particle that carries a negative elementary electric charge and orbits the nucleus of an atom, playing a fundamental role in electricity and chemical bonding.
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7
Medium pms Uploaded: 17 Aug 2026

Beats in sound are produced due to the superposition of two waves having:

  • A Slightly different frequencies
  • B Same frequency
  • C Same amplitude only
  • D Different mediums
Permalink
Correct Answer: Option A — Slightly different frequencies
Explanation: Beats are periodic variations in loudness that occur when two sound waves of slightly different frequencies interfere with each other, producing a pulsing effect at a frequency equal to their difference.
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8
Medium pms Uploaded: 17 Aug 2026

The internal energy of an ideal gas depends only on its:

  • A Pressure
  • B Density
  • C Temperature
  • D Volume
Permalink
Correct Answer: Option C — Temperature
Explanation: For an ideal gas, internal energy depends solely on its absolute temperature because ideal gas molecules are assumed to have no intermolecular forces, so energy is purely kinetic in nature.
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9
Medium pms Uploaded: 17 Aug 2026

The first law of thermodynamics is a statement of conservation of:

  • A Charge
  • B Momentum
  • C Mass
  • D Energy
Permalink
Correct Answer: Option D — Energy
Explanation: The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form to another, linking heat, internal energy, and work done by or on a system.
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10
Easy pms Uploaded: 06 Aug 2026

Which type of energy transformation occurs in a solar panel?

  • A Chemical to electrical
  • B Thermal to mechanical
  • C Light to electrical
  • D Electrical to light
Permalink
Correct Answer: Option C — Light to electrical
Explanation: Solar panels convert light energy from the sun directly into electrical energy through the photovoltaic effect, where photons striking semiconductor materials like silicon dislodge electrons, generating an electric current that can power devices.
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11
Easy pms Uploaded: 17 Aug 2026

The image formed by a plane mirror is:

  • A Real and erect
  • B Virtual and inverted
  • C Real and inverted
  • D Virtual and erect
Permalink
Correct Answer: Option D — Virtual and erect
Explanation: A plane mirror always forms a virtual, erect image that appears to be located behind the mirror at the same distance as the object is in front of it, with equal size.
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12
Easy pms Uploaded: 17 Aug 2026

The device that converts mechanical energy into electrical energy is called a:

  • A Motor
  • B Transformer
  • C Generator
  • D Rectifier
Permalink
Correct Answer: Option C — Generator
Explanation: A generator is a device that converts mechanical energy, often from a rotating turbine, into electrical energy through the process of electromagnetic induction as a coil rotates within a magnetic field.
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13
Easy pms Uploaded: 17 Aug 2026

The human eye lens is:

  • A Concave
  • B Convex
  • C Cylindrical
  • D Plane
Permalink
Correct Answer: Option B — Convex
Explanation: The lens of the human eye is a convex, converging lens that helps focus incoming light rays onto the retina, and its shape can be adjusted by the ciliary muscles to focus at different distances.
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14
Medium pms Uploaded: 06 Aug 2026

What is the unit used to measure the amount of electric charge?

  • A Ampere
  • B Volt
  • C Coulomb
  • D Ohm
Permalink
Correct Answer: Option C — Coulomb
Explanation: Electric charge is measured in Coulombs, named after French physicist Charles-Augustin de Coulomb. One coulomb represents the charge transported by a steady current of one ampere flowing for one second of time.
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15
Hard pms Uploaded: 17 Aug 2026

Gamma rays are a form of:

  • A High-energy electromagnetic radiation
  • B Particle radiation
  • C Matter waves
  • D Sound waves
Permalink
Correct Answer: Option A — High-energy electromagnetic radiation
Explanation: Gamma rays are a highly penetrating form of electromagnetic radiation with extremely short wavelengths and high energy, typically emitted from the nucleus of an atom during radioactive decay processes.
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16
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.
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17
Hard pms Uploaded: 06 Aug 2026

What is the SI unit of magnetic flux?

  • A Henry
  • B Gauss
  • C Tesla
  • D Weber
Permalink
Correct Answer: Option D — Weber
Explanation: The Weber (Wb) is the SI unit of magnetic flux, named after Wilhelm Weber. It quantifies the total magnetic field passing through a given area, and is related to Tesla, the unit of magnetic flux density, by the area of the surface.
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18
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.
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19
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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20
Medium pms Uploaded: 06 Aug 2026

Which wave property determines the pitch of a sound?

  • A Amplitude
  • B Wavelength
  • C Frequency
  • D Speed
Permalink
Correct Answer: Option C — Frequency
Explanation: The frequency of a sound wave determines its pitch, with higher frequencies producing higher-pitched sounds and lower frequencies producing lower-pitched sounds. Frequency is measured in Hertz, representing the number of wave cycles per second.
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