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Physics MCQs

177 Questions Subject Test
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121
Medium fpsc Uploaded: 17 Aug 2026

When resistors are connected in series, the total resistance:

  • A Decreases
  • B Remains the same
  • C Becomes zero
  • D Increases
Permalink
Correct Answer: Option D — Increases
Explanation: When resistors are connected in series, the total or equivalent resistance of the combination is the simple sum of all individual resistances, always resulting in an increase compared to any single resistor.
Submitted by: PaperMCQs
122
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
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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
123
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of force?

  • A Watt
  • B Joule
  • C Pascal
  • D Newton
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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
124
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
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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.
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125
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
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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.
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126
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of electric charge?

  • A Coulomb
  • B Ampere
  • C Volt
  • D Farad
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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.
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127
Easy fpsc Uploaded: 06 Aug 2026

Which scientist formulated the three laws of motion?

  • A Albert Einstein
  • B Isaac Newton
  • C Galileo Galilei
  • D Michael Faraday
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Correct Answer: Option B — Isaac Newton
Explanation: Isaac Newton formulated three fundamental laws of motion describing the relationship between an object's motion and the forces acting upon it. These laws form the foundation of classical mechanics and remain essential to physics today.
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128
Hard fpsc Uploaded: 17 Aug 2026

Which type of radioactive decay involves the emission of an electron?

  • A Positron decay
  • B Gamma decay
  • C Beta decay
  • D Alpha decay
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Correct Answer: Option C — Beta decay
Explanation: Beta decay is a type of radioactive decay in which a neutron in an unstable nucleus transforms into a proton, emitting a high-energy electron, known as a beta particle, in the process.
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129
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of frequency?

  • A Watt
  • B Newton
  • C Pascal
  • D Hertz
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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.
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130
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
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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.
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131
Medium fpsc Uploaded: 06 Aug 2026

Which scientist formulated the three laws of planetary motion?

  • A Galileo Galilei
  • B Nicolaus Copernicus
  • C Isaac Newton
  • D Johannes Kepler
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Correct Answer: Option D — Johannes Kepler
Explanation: Johannes Kepler formulated the three laws of planetary motion in the early 17th century, describing how planets move in elliptical orbits around the sun. His laws laid crucial groundwork later used by Newton to develop the law of universal gravitation.
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132
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
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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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133
Medium fpsc Uploaded: 17 Aug 2026

Static electricity is generated by:

  • A Magnetic induction
  • B Friction between two objects causing charge transfer
  • C Chemical reactions in a battery
  • D Flow of current in a wire
Permalink
Correct Answer: Option B — Friction between two objects causing charge transfer
Explanation: Static electricity is typically generated through the process of friction, where electrons are transferred between two objects rubbed together, leaving one object with a net positive and the other a net negative charge.
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134
Medium fpsc Uploaded: 17 Aug 2026

The SI unit of pressure is:

  • A Newton
  • B Watt
  • C Pascal
  • D Joule
Permalink
Correct Answer: Option C — Pascal
Explanation: Pressure is defined as force per unit area and its SI unit is the Pascal (Pa), equivalent to one Newton per square metre, used to measure fluid pressure, atmospheric pressure, and stress in materials.
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135
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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136
Hard fpsc Uploaded: 06 Aug 2026

Which type of motion describes an object moving in a circular path at constant speed?

  • A Uniform circular motion
  • B Linear motion
  • C Simple harmonic motion
  • D Projectile motion
Permalink
Correct Answer: Option A — Uniform circular motion
Explanation: Uniform circular motion describes an object moving along a circular path at constant speed, though its velocity continuously changes direction. This motion requires a centripetal force directed toward the center of the circular path.
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137
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.
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138
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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139
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
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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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140
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
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