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Physics MCQs

159 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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101
Medium ppsc Uploaded: 17 Aug 2026

The phenomenon of bending of light around obstacles is called:

  • A Refraction
  • B Diffraction
  • C Reflection
  • D Dispersion
Permalink
Correct Answer: Option B — Diffraction
Explanation: Diffraction is the bending and spreading of waves, including light and sound, as they pass around obstacles or through narrow openings, becoming more noticeable when the obstacle size is comparable to the wavelength.
Submitted by: PaperMCQs
102
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What type of lens is thicker at the centre than at the edges?

  • A Concave lens
  • B Plano-concave lens
  • C Biconcave lens
  • D Convex lens
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Correct Answer: Option D — Convex lens
Explanation: A convex lens also called a converging lens is thicker at the centre than at the edges and brings parallel rays of light to a focus at a point called the focal point.
Submitted by: PaperMCQs
103
Medium ppsc Uploaded: 17 Aug 2026

A collision in which kinetic energy is not conserved is called:

  • A Inelastic collision
  • B Elastic collision
  • C Momentum collision
  • D Perfectly elastic collision
Permalink
Correct Answer: Option A — Inelastic collision
Explanation: In an inelastic collision, total momentum of the system is conserved but kinetic energy is not, as some energy is transformed into heat, sound, or deformation of the colliding bodies during impact.
Submitted by: PaperMCQs
104
Hard ppsc Uploaded: 06 Aug 2026

Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?

  • A Charles's Law
  • B Boyle's Law
  • C Gay-Lussac's Law
  • D Avogadro's Law
Permalink
Correct Answer: Option A — Charles's Law
Explanation: Charles's Law states that at constant pressure, the volume of a fixed amount of gas is directly proportional to its absolute temperature. As temperature increases, gas molecules move faster, causing the gas to expand proportionally.
Submitted by: PaperMCQs
105
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the half-life of a radioactive substance?

  • A Time for the substance to completely decay
  • B Time for the radiation to halve in intensity only
  • C Time for half the nuclei to decay
  • D Time for temperature to reduce by half
Permalink
Correct Answer: Option C — Time for half the nuclei to decay
Explanation: Half-life is the time required for half of the radioactive nuclei in a sample to decay and it is a constant characteristic value specific to each radioactive isotope.
Submitted by: PaperMCQs
106
Medium ppsc Uploaded: 17 Aug 2026

The boiling point of water on the Fahrenheit scale is:

  • A 100 degrees
  • B 212 degrees
  • C 32 degrees
  • D 373 degrees
Permalink
Correct Answer: Option B — 212 degrees
Explanation: On the Fahrenheit scale, water boils at 212 degrees Fahrenheit under standard atmospheric pressure, corresponding to 100 degrees Celsius, forming an important reference point on this temperature scale.
Submitted by: PaperMCQs
107
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of pressure?

  • A Newton
  • B Joule
  • C Pascal
  • D Watt
Permalink
Correct Answer: Option C — Pascal
Explanation: The Pascal is the SI unit of pressure named after Blaise Pascal and defined as one Newton of force per square metre of area.
Submitted by: PaperMCQs
108
Medium ppsc Uploaded: 06 Aug 2026

What is the value of absolute zero temperature in Celsius?

  • A -373°C
  • B -273.15°C
  • C -100°C
  • D 0°C
Permalink
Correct Answer: Option B — -273.15°C
Explanation: Absolute zero is -273.15°C, the theoretical temperature at which all molecular motion ceases and entropy reaches its minimum value. It serves as the zero point on the Kelvin scale, which is widely used in thermodynamic calculations.
Submitted by: PaperMCQs
109
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which particle carries a positive electric charge in an atom?

  • A Electron
  • B Neutron
  • C Proton
  • D Photon
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Correct Answer: Option C — Proton
Explanation: Protons are positively charged subatomic particles located in the nucleus of an atom with a charge equal in magnitude but opposite in sign to that of an electron.
Submitted by: PaperMCQs
110
Medium ppsc Uploaded: 06 Aug 2026

Which quantity remains constant in an isolated system according to the law of conservation of momentum?

  • A Total momentum
  • B Total energy
  • C Total mass
  • D Total force
Permalink
Correct Answer: Option A — Total momentum
Explanation: The law of conservation of momentum states that the total momentum of an isolated system remains constant unless acted upon by external forces. This principle applies to collisions, explosions, and various interactions between objects.
Submitted by: PaperMCQs
111
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which experiment demonstrated that light behaves as a wave by producing an interference pattern?

  • A Young's double slit experiment
  • B Rutherford's gold foil experiment
  • C Millikan's oil drop experiment
  • D Compton scattering experiment
Permalink
Correct Answer: Option A — Young's double slit experiment
Explanation: Young's double slit experiment demonstrated light's wave nature by producing alternating bright and dark fringes on a screen when coherent light passed through two closely spaced slits.
Submitted by: PaperMCQs
112
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of energy?

  • A Joule
  • B Watt
  • C Newton
  • D Pascal
Permalink
Correct Answer: Option A — Joule
Explanation: The Joule is the SI unit of energy defined as the work done when a force of one Newton moves an object one metre in the direction of the force.
Submitted by: PaperMCQs
113
Easy fpsc ppsc nts Uploaded: 05 Aug 2026

Which property of a wave is the distance measured from one crest to the next crest?

  • A Amplitude
  • B Frequency
  • C Wavelength
  • D Speed
Permalink
Correct Answer: Option C — Wavelength
Explanation: Wavelength is the distance between two successive identical points on a wave such as crest to crest and is inversely related to frequency for waves travelling at the same speed.
Submitted by: PaperMCQs
114
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the function of an optical fibre?

  • A To store electrical energy
  • B To transmit light signals over long distances using total internal reflection
  • C To measure temperature
  • D To amplify sound waves
Permalink
Correct Answer: Option B — To transmit light signals over long distances using total internal reflection
Explanation: Optical fibres transmit light signals over long distances using total internal reflection within a glass or plastic fibre and are the backbone of modern high-speed internet communications.
Submitted by: PaperMCQs
115
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Who explained the photoelectric effect and won the Nobel Prize for it in 1921?

  • A Albert Einstein
  • B Max Planck
  • C Niels Bohr
  • D Ernest Rutherford
Permalink
Correct Answer: Option A — Albert Einstein
Explanation: Albert Einstein explained the photoelectric effect in 1905 by proposing that light consists of discrete packets of energy called photons and won the Nobel Prize in Physics in 1921 for this work.
Submitted by: PaperMCQs
116
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which device is used to measure the electric current flowing through a circuit?

  • A Voltmeter
  • B Ohmmeter
  • C Galvanometer
  • D Ammeter
Permalink
Correct Answer: Option D — Ammeter
Explanation: An ammeter is connected in series in a circuit to measure the electric current flowing through it and is designed with very low internal resistance to minimise circuit disturbance.
Submitted by: PaperMCQs
117
Medium ppsc Uploaded: 06 Aug 2026

Which type of wave requires a medium to travel through?

  • A Electromagnetic wave
  • B Light wave
  • C Radio wave
  • D Mechanical wave
Permalink
Correct Answer: Option D — Mechanical wave
Explanation: Mechanical waves, such as sound waves and water waves, require a physical medium like air, water, or solids to propagate, as they rely on the vibration and interaction of particles within that medium.
Submitted by: PaperMCQs
118
Medium ppsc Uploaded: 17 Aug 2026

Which characteristic of sound is related to its frequency?

  • A Pitch
  • B Intensity
  • C Loudness
  • D Quality
Permalink
Correct Answer: Option A — Pitch
Explanation: Pitch is the perceptual characteristic of sound that is directly related to its frequency; higher frequency sounds are perceived as having a higher pitch, while lower frequencies produce a lower pitch.
Submitted by: PaperMCQs
119
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which scientist formulated the law of universal gravitation?

  • A Galileo Galilei
  • B Isaac Newton
  • C Michael Faraday
  • D James Clerk Maxwell
Permalink
Correct Answer: Option B — Isaac Newton
Explanation: Isaac Newton formulated the law of universal gravitation in 1687 stating that every mass attracts every other mass with a force proportional to their masses and inversely proportional to the square of the distance.
Submitted by: PaperMCQs
120
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which principle explains why an aircraft wing generates lift?

  • A Pascal's principle
  • B Bernoulli's principle
  • C Archimedes' principle
  • D Newton's first law only
Permalink
Correct Answer: Option B — Bernoulli's principle
Explanation: Bernoulli's principle explains that faster moving air over the curved upper wing surface has lower pressure than the slower air beneath creating a net upward lift force.
Submitted by: PaperMCQs
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