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Physics MCQs

159 Questions Subject Test
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Practice core concepts of measurement, motion, force, energy, waves, electricity, magnetism and modern physics.

MechanicsWavesElectricityModern Physics
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141
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Which type of mirror is used in reflecting telescopes?

  • A Plane mirror
  • B Parabolic concave mirror
  • C Convex mirror
  • D Cylindrical mirror
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Correct Answer: Option B — Parabolic concave mirror
Explanation: Reflecting telescopes use parabolic concave mirrors to collect and focus parallel rays of light from distant stars to a single focal point without chromatic aberration.
Submitted by: PaperMCQs
142
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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.
Submitted by: PaperMCQs
143
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

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.
Submitted by: PaperMCQs
144
Medium ppsc Uploaded: 17 Aug 2026

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
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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.
Submitted by: PaperMCQs
145
Hard ppsc Uploaded: 17 Aug 2026

The work function of a metal is the minimum energy required to:

  • A Break a chemical bond
  • B Melt the metal
  • C Ionize the nucleus
  • D Remove an electron from the metal surface
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Correct Answer: Option D — Remove an electron from the metal surface
Explanation: The work function is the minimum amount of energy needed to eject an electron from the surface of a metal, a key concept in explaining the threshold frequency in the photoelectric effect.
Submitted by: PaperMCQs
146
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the unit of power in the SI system?

  • A Watt
  • B Joule
  • C Newton
  • D Pascal
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Correct Answer: Option A — Watt
Explanation: The Watt is the SI unit of power named after James Watt and defined as one joule of energy transferred or converted per second.
Submitted by: PaperMCQs
147
Hard ppsc Uploaded: 17 Aug 2026

Which law states that a body continues in its state of rest or uniform motion unless acted upon by a net external force?

  • A Law of gravitation
  • B Newton's third law
  • C Newton's first law
  • D Newton's second law
Permalink
Correct Answer: Option C — Newton's first law
Explanation: Newton's first law of motion, also called the law of inertia, states that a body maintains its state of rest or constant velocity motion unless a net external force changes that state.
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148
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
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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
149
Easy ppsc Uploaded: 17 Aug 2026

The acceleration due to gravity on Earth's surface is approximately:

  • A 9.8 m/s^2
  • B 10.8 m/s^2
  • C 9.8 m/s
  • D 6.7 m/s^2
Permalink
Correct Answer: Option A — 9.8 m/s^2
Explanation: Standard gravitational acceleration near Earth's surface is approximately 9.8 metres per second squared, meaning a freely falling object's speed increases by about 9.8 m/s every second, ignoring air resistance.
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150
Easy ppsc nts Uploaded: 13 Jul 2026

Which law describes the relationship between the lengths of the sides of a right-angled triangle?

  • A Newton's Law
  • B Pythagoras's Theorem
  • C Kepler's Law
  • D Coulomb's Law
Permalink
Correct Answer: Option B — Pythagoras's Theorem
Explanation: Pythagoras's Theorem states that in a right-angled triangle the square of the hypotenuse equals the sum of the squares of the other two sides and is fundamental in physics calculations.
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151
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which device converts mechanical energy into electrical energy?

  • A Motor
  • B Transformer
  • C Generator
  • D Battery
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Correct Answer: Option C — Generator
Explanation: A generator converts mechanical energy into electrical energy through electromagnetic induction as a rotating coil moves within a magnetic field inducing an electric current.
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152
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which law explains why rockets can propel themselves in space?

  • A Newton's First Law
  • B Newton's Third Law
  • C Bernoulli's Principle
  • D Newton's Second Law
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Correct Answer: Option B — Newton's Third Law
Explanation: Rockets work on Newton's Third Law as gases expelled backward at high speed produce an equal and opposite forward thrust allowing propulsion even in the vacuum of space.
Submitted by: PaperMCQs
153
Medium ppsc Uploaded: 06 Aug 2026

Which type of energy is associated with the position of an object in a gravitational field?

  • A Kinetic energy
  • B Gravitational potential energy
  • C Elastic potential energy
  • D Thermal energy
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Correct Answer: Option B — Gravitational potential energy
Explanation: Gravitational potential energy depends on an object's height above a reference point and its mass, representing stored energy due to its position in a gravitational field. This energy converts to kinetic energy as the object falls.
Submitted by: PaperMCQs
154
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of electric current?

  • A Volt
  • B Ohm
  • C Ampere
  • D Watt
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Correct Answer: Option C — Ampere
Explanation: The Ampere named after French physicist Andre-Marie Ampere is the SI base unit of electric current representing the flow of one coulomb of charge per second.
Submitted by: PaperMCQs
155
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which type of electromagnetic wave has the highest frequency and energy in the spectrum?

  • A Radio waves
  • B X-rays
  • C Gamma rays
  • D Ultraviolet
Permalink
Correct Answer: Option C — Gamma rays
Explanation: Gamma rays have the highest frequency and energy in the electromagnetic spectrum produced by nuclear reactions and radioactive decay and can only be blocked by thick lead or concrete.
Submitted by: PaperMCQs
156
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the SI unit of capacitance?

  • A Henry
  • B Farad
  • C Tesla
  • D Ohm
Permalink
Correct Answer: Option B — Farad
Explanation: The Farad is the SI unit of capacitance named after Michael Faraday defined as the capacitance of a capacitor that stores one coulomb of charge at one volt potential difference.
Submitted by: PaperMCQs
157
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which scale of temperature is used in thermodynamic calculations and starts at absolute zero?

  • A Kelvin
  • B Celsius
  • C Fahrenheit
  • D Rankine
Permalink
Correct Answer: Option A — Kelvin
Explanation: The Kelvin scale is the SI thermodynamic temperature scale starting at absolute zero and used in all scientific thermodynamic calculations because it has no negative values.
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158
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the process by which a solid changes directly into a gas without passing through the liquid phase?

  • A Evaporation
  • B Sublimation
  • C Condensation
  • D Vaporisation
Permalink
Correct Answer: Option B — Sublimation
Explanation: Sublimation is the direct phase transition from solid to gas without passing through the liquid state as demonstrated by dry ice converting to carbon dioxide gas.
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159
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of radiation consists of helium nuclei emitted from an unstable nucleus?

  • A Alpha radiation
  • B Beta radiation
  • C Gamma radiation
  • D Neutron radiation
Permalink
Correct Answer: Option A — Alpha radiation
Explanation: Alpha radiation consists of particles identical to helium-4 nuclei containing two protons and two neutrons emitted from heavy unstable nuclei during radioactive decay.
Submitted by: PaperMCQs
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