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Physics MCQs

442 Questions Subject Test
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241
Medium pms Uploaded: 06 Aug 2026

Which form of energy is stored in a stretched rubber band?

  • A Kinetic energy
  • B Thermal energy
  • C Chemical energy
  • D Potential energy
Permalink
Correct Answer: Option D — Potential energy
Explanation: A stretched rubber band stores elastic potential energy due to deformation of its molecular structure. When released, this stored energy converts into kinetic energy, causing the band to snap back to its original shape rapidly.
Submitted by: PaperMCQs
242
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
243
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.
Submitted by: PaperMCQs
244
Easy pms Uploaded: 06 Aug 2026

What is the term for the minimum energy required to remove an electron from an atom?

  • A Ionization energy
  • B Binding energy
  • C Kinetic energy
  • D Photon energy
Permalink
Correct Answer: Option A — Ionization energy
Explanation: Ionization energy refers to the minimum amount of energy required to remove an electron from an atom or ion in its ground state, forming a positively charged ion, and varies systematically across the periodic table.
Submitted by: PaperMCQs
245
Medium pms Uploaded: 17 Aug 2026

The formula for electric power in terms of voltage and current is:

  • A P = V/I
  • B P = I/V
  • C P = VI
  • D P = V + I
Permalink
Correct Answer: Option C — P = VI
Explanation: Electric power is calculated by multiplying voltage across a component by the current flowing through it, giving the formula P equals V times I, measured in watts.
Submitted by: PaperMCQs
246
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
247
Medium fpsc Uploaded: 06 Aug 2026

What is the term for the study of motion without considering the forces causing it?

  • A Kinematics
  • B Dynamics
  • C Statics
  • D Mechanics
Permalink
Correct Answer: Option A — Kinematics
Explanation: Kinematics is the branch of mechanics that describes motion in terms of displacement, velocity, and acceleration without analyzing the forces responsible for that motion. It focuses purely on describing how objects move over time.
Submitted by: PaperMCQs
248
Medium nts Uploaded: 17 Aug 2026

Which of the following best defines heat?

  • A Energy stored in a body
  • B Total kinetic energy of molecules
  • C Force between molecules
  • D Energy transferred due to temperature difference
Permalink
Correct Answer: Option D — Energy transferred due to temperature difference
Explanation: Heat is defined as the transfer of thermal energy between two systems or objects due to a temperature difference between them, always flowing spontaneously from hotter to colder regions.
Submitted by: PaperMCQs
249
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.
Submitted by: PaperMCQs
250
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which type of wave does not require a medium to travel?

  • A Sound wave
  • B Water wave
  • C Seismic wave
  • D Electromagnetic wave
Permalink
Correct Answer: Option D — Electromagnetic wave
Explanation: Electromagnetic waves such as light radio waves and X-rays can travel through a vacuum without requiring a medium distinguishing them from mechanical waves like sound.
Submitted by: PaperMCQs
251
Medium pms Uploaded: 17 Aug 2026

The formula for kinetic energy is:

  • A mgh
  • B Fd
  • C mv
  • D (1/2)mv^2
Permalink
Correct Answer: Option D — (1/2)mv^2
Explanation: Kinetic energy, the energy possessed by a body due to its motion, is calculated using the formula one-half times mass times velocity squared, derived from the work-energy theorem in classical mechanics.
Submitted by: PaperMCQs
252
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which device converts light energy directly into electrical energy using the photovoltaic effect?

  • A Generator
  • B Transformer
  • C Solar cell
  • D Battery
Permalink
Correct Answer: Option C — Solar cell
Explanation: A solar cell converts light energy directly into electrical energy using the photovoltaic effect when photons knock electrons free in semiconductor materials creating an electric current.
Submitted by: PaperMCQs
253
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the centripetal force?

  • A Force pushing an object outward in circular motion
  • B Force causing linear acceleration
  • C Force equal to mass times velocity
  • D Force directed toward the centre of circular motion
Permalink
Correct Answer: Option D — Force directed toward the centre of circular motion
Explanation: Centripetal force is the force directed toward the centre of circular motion that keeps an object moving in a curved path and is provided by tension gravity or friction depending on the situation.
Submitted by: PaperMCQs
254
Easy nts Uploaded: 06 Aug 2026

What is the phenomenon called when light changes speed and direction while passing from one medium to another?

  • A Reflection
  • B Interference
  • C Refraction
  • D Polarization
Permalink
Correct Answer: Option C — Refraction
Explanation: Refraction is the bending of light as it passes from one transparent medium to another with a different optical density, caused by a change in the speed of light. This phenomenon explains why a straw appears bent when placed in water.
Submitted by: PaperMCQs
255
Medium nts Uploaded: 06 Aug 2026

What is the term for the smallest particle of an element that retains its chemical properties?

  • A Molecule
  • B Ion
  • C Atom
  • D Electron
Permalink
Correct Answer: Option C — Atom
Explanation: An atom is the smallest unit of an element that retains all the chemical properties of that element. Atoms consist of a nucleus containing protons and neutrons, surrounded by orbiting electrons in defined energy levels.
Submitted by: PaperMCQs
256
Easy ppsc Uploaded: 17 Aug 2026

The working principle of an optical fiber is based on:

  • A Polarization
  • B Refraction
  • C Diffraction
  • D Total internal reflection
Permalink
Correct Answer: Option D — Total internal reflection
Explanation: Optical fibers transmit light signals over long distances by relying on the principle of total internal reflection, which keeps the light confined within the core of the fiber as it travels.
Submitted by: PaperMCQs
257
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
258
Easy pms Uploaded: 06 Aug 2026

What is the term for energy possessed by an object due to its motion?

  • A Potential energy
  • B Thermal energy
  • C Nuclear energy
  • D Kinetic energy
Permalink
Correct Answer: Option D — Kinetic energy
Explanation: Kinetic energy is the energy an object possesses due to its motion, calculated using its mass and velocity. A moving car, a flying ball, and flowing water all demonstrate kinetic energy in everyday situations.
Submitted by: PaperMCQs
259
Easy ppsc Uploaded: 17 Aug 2026

Absolute zero on the Kelvin scale corresponds to:

  • A 0 degrees Celsius
  • B -273.15 degrees Celsius
  • C 100 degrees Celsius
  • D -100 degrees Celsius
Permalink
Correct Answer: Option B — -273.15 degrees Celsius
Explanation: Absolute zero, the lowest possible temperature where particles have minimum thermal motion, corresponds to -273.15 degrees Celsius, which is defined as zero Kelvin on the absolute temperature scale.
Submitted by: PaperMCQs
260
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
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