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Physics MCQs

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121
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of force?

  • A Watt
  • B Joule
  • C Pascal
  • D Newton
Permalink
Correct Answer: Option D — Newton
Explanation: The Newton named after Isaac Newton is the SI unit of force defined as the force needed to accelerate a mass of one kilogram at one metre per second squared.
Submitted by: PaperMCQs
122
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which scientist developed the theory of general relativity extending special relativity to include gravity?

  • A Isaac Newton
  • B Albert Einstein
  • C Niels Bohr
  • D Max Planck
Permalink
Correct Answer: Option B — Albert Einstein
Explanation: Albert Einstein developed the theory of general relativity in 1915 describing gravity as a curvature of spacetime caused by mass and energy rather than a force between objects.
Submitted by: PaperMCQs
123
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which type of spectrum consists of specific discrete wavelengths emitted by excited atoms?

  • A Continuous spectrum
  • B Line emission spectrum
  • C Absorption spectrum
  • D Band spectrum
Permalink
Correct Answer: Option B — Line emission spectrum
Explanation: A line emission spectrum consists of discrete bright lines at specific wavelengths produced when electrons in excited atoms fall to lower energy levels releasing photons of specific energies.
Submitted by: PaperMCQs
124
Medium ppsc Uploaded: 06 Aug 2026

Which of the following is an example of electromagnetic radiation?

  • A Seismic waves
  • B Water waves
  • C X-rays
  • D Sound waves
Permalink
Correct Answer: Option C — X-rays
Explanation: X-rays are a form of electromagnetic radiation with wavelengths shorter than ultraviolet light. Unlike sound or water waves, which are mechanical waves requiring a medium, electromagnetic radiation like X-rays can travel through the vacuum of space.
Submitted by: PaperMCQs
125
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of electric charge?

  • A Coulomb
  • B Ampere
  • C Volt
  • D Farad
Permalink
Correct Answer: Option A — Coulomb
Explanation: The Coulomb is the SI unit of electric charge defined as the quantity of electricity transported in one second by a current of one ampere.
Submitted by: PaperMCQs
126
Hard ppsc Uploaded: 17 Aug 2026

Coulomb's law describes the force between:

  • A Two resistors
  • B Two currents
  • C Two point charges
  • D Two magnets
Permalink
Correct Answer: Option C — Two point charges
Explanation: Coulomb's law quantifies the electrostatic force between two stationary point charges, stating that the force is directly proportional to the product of the charges and inversely proportional to the square of distance.
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127
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of frequency?

  • A Watt
  • B Newton
  • C Pascal
  • D Hertz
Permalink
Correct Answer: Option D — Hertz
Explanation: Hertz is the SI unit of frequency representing the number of cycles or oscillations per second and is named after German physicist Heinrich Hertz.
Submitted by: PaperMCQs
128
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which type of wave requires no medium and can travel through a vacuum at the speed of light?

  • A Sound wave
  • B Electromagnetic wave
  • C Water wave
  • D Seismic wave
Permalink
Correct Answer: Option B — Electromagnetic wave
Explanation: Electromagnetic waves including light radio waves X-rays and gamma rays do not require a medium and travel through a vacuum at approximately 300000 kilometres per second.
Submitted by: PaperMCQs
129
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the Doppler effect in the context of sound waves?

  • A Change in speed of sound due to medium
  • B Change in amplitude of sound near a source
  • C Echo formation from hard surfaces
  • D Apparent change in frequency due to relative motion between source and observer
Permalink
Correct Answer: Option D — Apparent change in frequency due to relative motion between source and observer
Explanation: The Doppler effect describes the apparent change in frequency of sound or light when the source and observer are in relative motion with frequency increasing as they approach and decreasing as they move apart.
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130
Medium ppsc Uploaded: 17 Aug 2026

Which process occurs at constant volume?

  • A Adiabatic process
  • B Isobaric process
  • C Isothermal process
  • D Isochoric process
Permalink
Correct Answer: Option D — Isochoric process
Explanation: An isochoric process is a thermodynamic process that takes place at constant volume, meaning no work is done by or on the gas since work requires a change in volume during expansion or compression.
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131
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the relationship between work done and force in the direction of displacement?

  • A Work equals force times displacement
  • B Work equals force plus displacement
  • C Work equals force times time
  • D Work equals force divided by displacement
Permalink
Correct Answer: Option A — Work equals force times displacement
Explanation: Work done is defined as the force applied multiplied by the displacement in the direction of that force expressed as W equals Fd where both force and displacement must be in the same direction.
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132
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which phenomenon explains the formation of mirages in deserts?

  • A Reflection of light
  • B Diffraction of light
  • C Total internal reflection due to air density layers
  • D Dispersion of light
Permalink
Correct Answer: Option C — Total internal reflection due to air density layers
Explanation: Mirages form due to total internal reflection when light rays from the sky refract through layers of air with varying temperature and density creating the illusion of water on the ground.
Submitted by: PaperMCQs
133
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is simple harmonic motion?

  • A Motion in a circle at constant speed
  • B Oscillatory motion where restoring force is proportional to displacement
  • C Uniform linear motion
  • D Random motion under multiple forces
Permalink
Correct Answer: Option B — Oscillatory motion where restoring force is proportional to displacement
Explanation: Simple harmonic motion is a type of oscillatory motion where the restoring force is directly proportional to the displacement from equilibrium and directed toward the equilibrium position.
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134
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which physical quantity is defined as force per unit area?

  • A Density
  • B Pressure
  • C Stress
  • D Torque
Permalink
Correct Answer: Option B — Pressure
Explanation: Pressure is defined as force per unit area measured in Pascals in the SI system and applies to fluids and gases exerting force on surfaces equally in all directions.
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135
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which phenomenon allows optical fibres to transmit light signals over long distances?

  • A Total internal reflection
  • B Refraction
  • C Diffraction
  • D Dispersion
Permalink
Correct Answer: Option A — Total internal reflection
Explanation: Total internal reflection occurs when light travelling in a dense medium hits the boundary at an angle greater than the critical angle causing all light to reflect back inside the fibre.
Submitted by: PaperMCQs
136
Easy ppsc Uploaded: 06 Aug 2026

What is the term for the distance between two consecutive crests of a wave?

  • A Amplitude
  • B Wavelength
  • C Period
  • D Frequency
Permalink
Correct Answer: Option B — Wavelength
Explanation: Wavelength is the distance between two consecutive corresponding points on a wave, such as crest to crest or trough to trough. It is inversely related to frequency, and together they determine the wave's speed through a given medium.
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137
Hard css fpsc ppsc Uploaded: 13 Jul 2026

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

  • A Ohm's Law
  • B Coulomb's Law
  • C Ampere's Law
  • D Faraday's Law
Permalink
Correct Answer: Option D — Faraday's Law
Explanation: Faraday's Law of Electromagnetic Induction states that the magnitude of the induced EMF equals the rate of change of magnetic flux through a circuit forming the basis of generators and transformers.
Submitted by: PaperMCQs
138
Easy ppsc Uploaded: 17 Aug 2026

The Doppler effect refers to the change in:

  • A Amplitude of a wave due to relative motion
  • B Wavelength of light due to temperature
  • C Speed of light in different media
  • D Frequency of a wave due to relative motion
Permalink
Correct Answer: Option D — Frequency of a wave due to relative motion
Explanation: The Doppler effect describes the apparent change in frequency or pitch of a wave observed by someone due to relative motion between the source of the wave and the observer.
Submitted by: PaperMCQs
139
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which colour of visible light has the shortest wavelength?

  • A Red
  • B Violet
  • C Orange
  • D Yellow
Permalink
Correct Answer: Option B — Violet
Explanation: Violet light has the shortest wavelength in the visible spectrum at approximately 380 to 450 nanometres and therefore the highest frequency and energy among visible colours.
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140
Medium ppsc Uploaded: 06 Aug 2026

What is the term for the total distance covered divided by total time taken, regardless of direction?

  • A Velocity
  • B Acceleration
  • C Displacement
  • D Average speed
Permalink
Correct Answer: Option D — Average speed
Explanation: Average speed is calculated by dividing the total distance traveled by the total time taken, without considering direction. It differs from average velocity, which accounts for displacement and direction of overall motion.
Submitted by: PaperMCQs
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