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Physics MCQs

228 Questions Subject Test
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181
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Sublimation refers to the direct change of state from:

  • A Gas to liquid
  • B Solid to gas
  • C Solid to liquid
  • D Liquid to gas
Permalink
Correct Answer: Option B — Solid to gas
Explanation: Sublimation is the process by which a substance transitions directly from a solid state to a gaseous state without passing through the intermediate liquid phase, as seen with dry ice.
Submitted by: PaperMCQs
182
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The electron was discovered by:

  • A Niels Bohr
  • B J.J. Thomson
  • C James Chadwick
  • D Ernest Rutherford
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Correct Answer: Option B — J.J. Thomson
Explanation: J.J. Thomson discovered the electron in 1897 through his experiments with cathode rays, identifying it as a negatively charged subatomic particle much smaller than the atom itself.
Submitted by: PaperMCQs
183
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
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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
184
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What is the term for the resistance of a fluid to flow due to internal friction?

  • A Density
  • B Buoyancy
  • C Viscosity
  • D Surface tension
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Correct Answer: Option C — Viscosity
Explanation: Viscosity describes a fluid's internal resistance to flow, caused by friction between its molecules. Highly viscous fluids like honey flow slowly, while low-viscosity fluids like water flow more freely and quickly under gravity.
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185
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A real image can be formed on a screen, whereas a virtual image:

  • A Is always inverted
  • B Cannot be formed on a screen
  • C Is always magnified
  • D Can also be formed on a screen
Permalink
Correct Answer: Option B — Cannot be formed on a screen
Explanation: A real image is formed by the actual convergence of light rays and can be captured on a screen, while a virtual image is formed by the apparent divergence of rays and cannot be projected.
Submitted by: PaperMCQs
186
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What is the process by which heat transfers through direct contact between particles?

  • A Convection
  • B Conduction
  • C Radiation
  • D Insulation
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Correct Answer: Option B — Conduction
Explanation: Conduction is the transfer of heat through direct contact between particles in a solid material, as vibrating molecules pass kinetic energy to neighboring molecules. Metals are typically good conductors due to their free electrons.
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187
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Heat always flows from a body at:

  • A Higher temperature to lower temperature
  • B Zero temperature
  • C Equal temperature
  • D Lower temperature to higher temperature
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Correct Answer: Option A — Higher temperature to lower temperature
Explanation: According to the second law of thermodynamics, heat spontaneously flows from a region of higher temperature to a region of lower temperature until thermal equilibrium is reached between the two bodies.
Submitted by: PaperMCQs
188
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Which material is generally used as an insulator?

  • A Copper
  • B Aluminum
  • C Silver
  • D Rubber
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Correct Answer: Option D — Rubber
Explanation: Rubber is commonly used as an electrical insulator because it has very high resistance to the flow of electric current, effectively preventing unwanted current leakage or short circuits in wiring.
Submitted by: PaperMCQs
189
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Which quantity remains conserved in an elastic collision?

  • A Only kinetic energy
  • B Both momentum and kinetic energy
  • C Neither momentum nor kinetic energy
  • D Only momentum
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Correct Answer: Option B — Both momentum and kinetic energy
Explanation: In an elastic collision, both total momentum and total kinetic energy of the system are conserved before and after the collision, unlike inelastic collisions where kinetic energy is lost as heat or deformation.
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190
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
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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.
Submitted by: PaperMCQs
191
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What does the term 'half-life' refer to in nuclear physics?

  • A Time for all radioactive atoms to decay
  • B Time for a nucleus to form
  • C Time for half of the radioactive atoms in a sample to decay
  • D Time for an atom to become stable
Permalink
Correct Answer: Option C — Time for half of the radioactive atoms in a sample to decay
Explanation: Half-life refers to the time required for half of the radioactive atoms in a given sample to undergo decay. This concept is essential in fields like radiometric dating, nuclear medicine, and understanding the stability of radioactive isotopes over time.
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192
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Ohm's law relates voltage, current, and:

  • A Power
  • B Charge
  • C Resistance
  • D Frequency
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Correct Answer: Option C — Resistance
Explanation: Ohm's law states that the current flowing through a conductor between two points is directly proportional to the voltage across those points and inversely proportional to the resistance of the conductor.
Submitted by: PaperMCQs
193
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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
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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.
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194
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Which quantity is defined as mass per unit volume?

  • A Specific gravity
  • B Weight
  • C Density
  • D Pressure
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Correct Answer: Option C — Density
Explanation: Density is defined as the mass of a substance divided by its volume, typically measured in kilograms per cubic metre, and it determines whether an object will float or sink in a given fluid.
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195
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What is the term for the process by which a substance changes from liquid to gas below its boiling point?

  • A Boiling
  • B Condensation
  • C Sublimation
  • D Evaporation
Permalink
Correct Answer: Option D — Evaporation
Explanation: Evaporation is the gradual process by which molecules at a liquid's surface gain enough energy to escape into the gas phase, occurring at temperatures below the substance's boiling point, unlike boiling which occurs throughout the liquid.
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196
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Which lens is used to correct myopia (nearsightedness)?

  • A Bifocal lens
  • B Convex lens
  • C Concave lens
  • D Cylindrical lens
Permalink
Correct Answer: Option C — Concave lens
Explanation: Myopia, or nearsightedness, occurs when the eye focuses images in front of the retina, and it is corrected using a concave (diverging) lens that spreads light rays before they enter the eye.
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197
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the process by which an unstable atomic nucleus spontaneously emits radiation?

  • A Fission
  • B Fusion
  • C Diffraction
  • D Radioactive decay
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Correct Answer: Option D — Radioactive decay
Explanation: Radioactive decay is the spontaneous emission of radiation from an unstable atomic nucleus as it transforms into a more stable configuration releasing alpha beta or gamma radiation.
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198
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Which type of spectrum is produced when white light passes through a prism?

  • A Line emission spectrum
  • B Continuous spectrum
  • C Band spectrum
  • D Absorption spectrum
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Correct Answer: Option B — Continuous spectrum
Explanation: A prism produces a continuous spectrum showing a smooth gradation from red to violet as white light is dispersed into its component wavelengths through refraction.
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199
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The relationship between wave speed, frequency, and wavelength is given by:

  • A v = f + lambda
  • B v = f/lambda
  • C v = f x lambda
  • D v = lambda/f
Permalink
Correct Answer: Option C — v = f x lambda
Explanation: The fundamental wave equation states that wave speed equals frequency multiplied by wavelength, connecting how fast a wave travels to how often it oscillates and the physical length of each cycle.
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200
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which scientist discovered electromagnetic induction demonstrating that a changing magnetic field induces current?

  • A Michael Faraday
  • B James Clerk Maxwell
  • C Nikola Tesla
  • D Heinrich Hertz
Permalink
Correct Answer: Option A — Michael Faraday
Explanation: Michael Faraday discovered electromagnetic induction in 1831 demonstrating that a changing magnetic flux through a conductor induces an electromotive force forming the basis of generators.
Submitted by: PaperMCQs
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