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Physics MCQs

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41
Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is the name of the force that holds protons and neutrons together inside the nucleus?

  • A Electromagnetic force
  • B Gravitational force
  • C Strong nuclear force
  • D Weak nuclear force
Permalink
Correct Answer: Option C — Strong nuclear force
Explanation: The strong nuclear force holds protons and neutrons together inside the atomic nucleus and is the strongest of the four fundamental forces operating only at very short ranges.
Submitted by: PaperMCQs
42
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.
Submitted by: PaperMCQs
43
Hard css fpsc Uploaded: 13 Jul 2026

What is the phenomenon where certain materials offer zero electrical resistance below a critical temperature?

  • A Semiconduction
  • B Ferromagnetism
  • C Piezoelectricity
  • D Superconductivity
Permalink
Correct Answer: Option D — Superconductivity
Explanation: Superconductivity is the phenomenon where certain materials exhibit zero electrical resistance and expel magnetic fields when cooled below a characteristic critical temperature.
Submitted by: PaperMCQs
44
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of magnetic flux in the SI system?

  • A Tesla
  • B Weber
  • C Ampere
  • D Farad
Permalink
Correct Answer: Option B — Weber
Explanation: The Weber is the SI unit of magnetic flux named after Wilhelm Eduard Weber and defined as the magnetic flux that when reduced to zero uniformly in one second induces an EMF of one volt.
Submitted by: PaperMCQs
45
Hard css Uploaded: 17 Aug 2026

Which of the following has the highest penetrating power?

  • A Sound waves
  • B Alpha particles
  • C Beta particles
  • D Gamma rays
Permalink
Correct Answer: Option D — Gamma rays
Explanation: Gamma rays have the highest penetrating power among common forms of radioactive emission because they are high-energy electromagnetic waves that can pass through most materials, requiring dense shielding like lead to block them.
Submitted by: PaperMCQs
46
Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is the phenomenon of resonance in physics?

  • A Increase in amplitude when driving frequency matches natural frequency
  • B Decrease in amplitude of oscillations over time
  • C The bending of waves around obstacles
  • D Splitting of white light into colours
Permalink
Correct Answer: Option A — Increase in amplitude when driving frequency matches natural frequency
Explanation: Resonance occurs when a system is driven at its natural frequency causing the amplitude of oscillations to increase dramatically and can be seen in musical instruments and bridges.
Submitted by: PaperMCQs
47
Hard ppsc Uploaded: 17 Aug 2026

A body floats in a liquid when its weight is:

  • A Less than the buoyant force
  • B Independent of buoyant force
  • C Greater than the buoyant force
  • D Equal to the buoyant force
Permalink
Correct Answer: Option D — Equal to the buoyant force
Explanation: A floating body is in equilibrium when the weight of the body acting downward exactly equals the upward buoyant force from the displaced fluid, according to Archimedes' principle of flotation.
Submitted by: PaperMCQs
48
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of luminous intensity in the SI system?

  • A Lux
  • B Lumen
  • C Watt
  • D Candela
Permalink
Correct Answer: Option D — Candela
Explanation: The Candela is the SI base unit of luminous intensity representing the power emitted by a light source in a particular direction per unit solid angle.
Submitted by: PaperMCQs
49
Hard css fpsc Uploaded: 05 Aug 2026

What is the unit of measurement for radioactive activity equal to one nuclear disintegration per second?

  • A Gray
  • B Becquerel
  • C Sievert
  • D Rem
Permalink
Correct Answer: Option B — Becquerel
Explanation: The Becquerel is the SI unit of radioactivity named after Henri Becquerel defined as one nuclear disintegration per second and replaced the older unit Curie in the SI system.
Submitted by: PaperMCQs
50
Hard nts Uploaded: 17 Aug 2026

Which thermometric scale has no negative values?

  • A Fahrenheit
  • B Kelvin
  • C Celsius
  • D Both Celsius and Fahrenheit
Permalink
Correct Answer: Option B — Kelvin
Explanation: The Kelvin scale is an absolute temperature scale that starts at absolute zero and has no negative values, unlike the Celsius and Fahrenheit scales which can represent temperatures below their zero points.
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51
Hard pms Uploaded: 17 Aug 2026

The law of conservation of energy states that energy:

  • A Can neither be created nor destroyed, only transformed
  • B Is always constant in every process
  • C Can be destroyed but not created
  • D Can be created but not destroyed
Permalink
Correct Answer: Option A — Can neither be created nor destroyed, only transformed
Explanation: This fundamental law states that the total energy of an isolated system remains constant; energy cannot be created or destroyed, it can only be converted from one form to another, such as kinetic to potential.
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52
Hard fpsc Uploaded: 17 Aug 2026

Which planet has the strongest surface gravity in our solar system?

  • A Mars
  • B Venus
  • C Earth
  • D Jupiter
Permalink
Correct Answer: Option D — Jupiter
Explanation: Jupiter, being the most massive planet in the solar system, has the strongest surface gravity among all planets, roughly 2.5 times that of Earth's, despite its lower average density.
Submitted by: PaperMCQs
53
Hard pms Uploaded: 06 Aug 2026

What is the main function of a transformer's core?

  • A To generate voltage
  • B To store electrical energy
  • C To resist current flow
  • D To provide a path for magnetic flux
Permalink
Correct Answer: Option D — To provide a path for magnetic flux
Explanation: A transformer's core, typically made of laminated iron, provides a low-reluctance path for magnetic flux generated by the primary coil. This efficiently channels the flux to the secondary coil, minimizing energy losses and enabling effective voltage transformation.
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54
Hard css fpsc Uploaded: 13 Jul 2026

What is the escape velocity from Earth's surface approximately?

  • A 11.2 km/s
  • B 7.9 km/s
  • C 5.5 km/s
  • D 15 km/s
Permalink
Correct Answer: Option A — 11.2 km/s
Explanation: The escape velocity from Earth's surface is approximately 11.2 kilometres per second the minimum speed needed for an object to escape Earth's gravitational pull without further propulsion.
Submitted by: PaperMCQs
55
Hard css Uploaded: 17 Aug 2026

X-rays were discovered by:

  • A Ernest Rutherford
  • B Marie Curie
  • C Wilhelm Rontgen
  • D Niels Bohr
Permalink
Correct Answer: Option C — Wilhelm Rontgen
Explanation: X-rays were discovered in 1895 by German physicist Wilhelm Conrad Rontgen, who observed a new type of penetrating radiation while experimenting with cathode ray tubes, earning him the first Nobel Prize in Physics.
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56
Hard css fpsc Uploaded: 13 Jul 2026

What is the SI unit of inductance?

  • A Farad
  • B Tesla
  • C Weber
  • D Henry
Permalink
Correct Answer: Option D — Henry
Explanation: The Henry is the SI unit of inductance named after American scientist Joseph Henry defined as the inductance that produces an EMF of one volt when current changes at one ampere per second.
Submitted by: PaperMCQs
57
Hard pms Uploaded: 17 Aug 2026

A magnetic field is produced around a conductor when it carries:

  • A Static charge only
  • B Voltage only
  • C Resistance
  • D Electric current
Permalink
Correct Answer: Option D — Electric current
Explanation: When an electric current flows through a conductor, it generates a magnetic field around that conductor, a phenomenon first discovered by Hans Christian Oersted, linking electricity and magnetism.
Submitted by: PaperMCQs
58
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.
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59
Hard pms Uploaded: 17 Aug 2026

The SI unit of electric current is:

  • A Volt
  • B Ohm
  • C Ampere
  • D Coulomb
Permalink
Correct Answer: Option C — Ampere
Explanation: Electric current, the rate of flow of electric charge, is measured in Amperes (A) in the SI system, named after the French physicist Andre-Marie Ampere, a pioneer of electromagnetism.
Submitted by: PaperMCQs
60
Hard pms Uploaded: 17 Aug 2026

A transformer works on the principle of:

  • A Electromagnetic induction
  • B Electrostatic attraction
  • C Thermal conduction
  • D Chemical reaction
Permalink
Correct Answer: Option A — Electromagnetic induction
Explanation: A transformer operates on the principle of mutual electromagnetic induction, using a changing current in a primary coil to induce a corresponding voltage in a secondary coil through a shared magnetic core.
Submitted by: PaperMCQs
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