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Physics MCQs

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

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Hard nts Uploaded: 06 Aug 2026

Which type of lens is used to correct nearsightedness?

  • A Concave lens
  • B Convex lens
  • C Cylindrical lens
  • D Bifocal lens
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Correct Answer: Option A — Concave lens
Explanation: Concave lenses, which diverge light rays, are used to correct nearsightedness (myopia) by shifting the focal point further back so images form correctly on the retina instead of in front of it.
Submitted by: PaperMCQs
22
Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is polarisation of light?

  • A Splitting light into its spectrum
  • B Restriction of light vibrations to a single plane
  • C Bending of light around obstacles
  • D Total reflection of light
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Correct Answer: Option B — Restriction of light vibrations to a single plane
Explanation: Polarisation restricts the transverse vibrations of light to a single plane demonstrating that light is a transverse wave and is used in polaroid sunglasses and LCD screens.
Submitted by: PaperMCQs
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Hard css Uploaded: 06 Aug 2026

Which scientific instrument is used to measure the intensity of earthquakes?

  • A Seismograph
  • B Barometer
  • C Anemometer
  • D Hygrometer
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Correct Answer: Option A — Seismograph
Explanation: A seismograph detects and records the intensity, duration, and direction of ground vibrations caused by earthquakes. This data helps scientists determine the magnitude and epicenter of seismic events, aiding disaster preparedness and monitoring.
Submitted by: PaperMCQs
24
Hard nts Uploaded: 17 Aug 2026

The speed of sound is greatest in:

  • A Solids
  • B Vacuum
  • C Gases
  • D Liquids
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Correct Answer: Option A — Solids
Explanation: Sound travels fastest through solids because their particles are closely packed together, allowing vibrations to be transmitted more efficiently compared to the more loosely spaced particles in liquids and gases.
Submitted by: PaperMCQs
25
Hard fpsc Uploaded: 17 Aug 2026

A transistor is primarily used for:

  • A Storing charge
  • B Generating light
  • C Measuring temperature
  • D Amplification and switching
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Correct Answer: Option D — Amplification and switching
Explanation: A transistor is a fundamental semiconductor device widely used for amplifying electronic signals and for switching electronic signals on and off, forming the basis of modern digital electronics and computing.
Submitted by: PaperMCQs
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Hard css fpsc Uploaded: 05 Aug 2026

Which phenomenon describes the bending of light around a massive object predicted by general relativity?

  • A Gravitational lensing
  • B Refraction
  • C Diffraction
  • D Polarisation
Permalink
Correct Answer: Option A — Gravitational lensing
Explanation: Gravitational lensing occurs when light from a distant source bends around a massive object confirming Einstein's general relativity and first observed during the 1919 solar eclipse.
Submitted by: PaperMCQs
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Hard css Uploaded: 17 Aug 2026

The unit used to measure the power of a lens is:

  • A Diopter
  • B Watt
  • C Meter
  • D Candela
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Correct Answer: Option A — Diopter
Explanation: The power of a lens, which indicates its ability to converge or diverge light, is measured in diopters, defined as the reciprocal of the focal length of the lens expressed in metres.
Submitted by: PaperMCQs
28
Hard nts Uploaded: 06 Aug 2026

What is the term for the distance traveled by an object per unit time?

  • A Acceleration
  • B Speed
  • C Velocity
  • D Displacement
Permalink
Correct Answer: Option B — Speed
Explanation: Speed is defined as the distance traveled by an object divided by the time taken, representing how fast an object moves regardless of direction. It is a scalar quantity, unlike velocity which includes direction.
Submitted by: PaperMCQs
29
Hard ppsc Uploaded: 17 Aug 2026

An object will sink in a fluid if its density is:

  • A Greater than the fluid's density
  • B Less than the fluid's density
  • C Zero
  • D Equal to the fluid's density
Permalink
Correct Answer: Option A — Greater than the fluid's density
Explanation: An object sinks in a fluid when its average density exceeds that of the fluid, because the buoyant force generated by the displaced fluid is insufficient to support the object's greater weight.
Submitted by: PaperMCQs
30
Hard css Uploaded: 17 Aug 2026

The device used to measure electric current in a circuit is called a:

  • A Ohmmeter
  • B Ammeter
  • C Galvanometer
  • D Voltmeter
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Correct Answer: Option B — Ammeter
Explanation: An ammeter is an instrument specifically designed to measure the electric current flowing through a circuit, and it must be connected in series within the circuit to accurately record the current.
Submitted by: PaperMCQs
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Hard css Uploaded: 17 Aug 2026

Waves that require a medium to travel are called:

  • A Electromagnetic waves
  • B Radio waves
  • C Light waves
  • D Mechanical waves
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Correct Answer: Option D — Mechanical waves
Explanation: Mechanical waves, such as sound and water waves, require a physical medium like air, water, or a solid to propagate, since they rely on the vibration of particles within that medium.
Submitted by: PaperMCQs
32
Hard pms Uploaded: 17 Aug 2026

Gamma rays are a form of:

  • A High-energy electromagnetic radiation
  • B Particle radiation
  • C Matter waves
  • D Sound waves
Permalink
Correct Answer: Option A — High-energy electromagnetic radiation
Explanation: Gamma rays are a highly penetrating form of electromagnetic radiation with extremely short wavelengths and high energy, typically emitted from the nucleus of an atom during radioactive decay processes.
Submitted by: PaperMCQs
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Hard css Uploaded: 06 Aug 2026

Which phenomenon occurs when two or more waves overlap and combine?

  • A Reflection
  • B Interference
  • C Refraction
  • D Diffraction
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Correct Answer: Option B — Interference
Explanation: Interference occurs when two or more waves overlap and combine, resulting in constructive interference that amplifies wave amplitude or destructive interference that reduces or cancels it, depending on their relative phase alignment at that point.
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34
Hard ppsc Uploaded: 17 Aug 2026

An adiabatic process is one in which:

  • A Pressure remains constant
  • B Volume remains constant
  • C Temperature remains constant
  • D No heat is exchanged with surroundings
Permalink
Correct Answer: Option D — No heat is exchanged with surroundings
Explanation: An adiabatic process is defined as a thermodynamic process during which no heat is transferred into or out of the system, so any change in internal energy results entirely from work done.
Submitted by: PaperMCQs
35
Hard css fpsc ppsc Uploaded: 13 Jul 2026

Which effect causes the apparent change in frequency of light from a moving star?

  • A Photoelectric effect
  • B Compton effect
  • C Zeeman effect
  • D Doppler effect
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Correct Answer: Option D — Doppler effect
Explanation: The Doppler effect causes light from a star moving away from us to shift to longer wavelengths called red shift while light from an approaching star shifts to shorter wavelengths called blue shift.
Submitted by: PaperMCQs
36
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of magnetic flux density?

  • A Tesla
  • B Weber
  • C Henry
  • D Farad
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Correct Answer: Option A — Tesla
Explanation: Tesla is the SI unit of magnetic flux density or magnetic field strength representing one weber of magnetic flux per square metre.
Submitted by: PaperMCQs
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Hard css Uploaded: 17 Aug 2026

Archimedes' principle explains the:

  • A Rise of liquid in capillary tubes
  • B Buoyant force on submerged objects
  • C Flow rate of fluids
  • D Pressure exerted by gases
Permalink
Correct Answer: Option B — Buoyant force on submerged objects
Explanation: Archimedes' principle states that a body submerged in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the body, explaining why objects float or sink.
Submitted by: PaperMCQs
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Hard css fpsc Uploaded: 13 Jul 2026

Which device uses the piezoelectric effect to produce ultrasonic waves?

  • A Loudspeaker
  • B Microphone
  • C Electric motor
  • D Ultrasonic transducer
Permalink
Correct Answer: Option D — Ultrasonic transducer
Explanation: An ultrasonic transducer uses the piezoelectric effect where certain crystals generate mechanical vibrations when an electric voltage is applied producing high frequency sound waves.
Submitted by: PaperMCQs
39
Hard ppsc Uploaded: 17 Aug 2026

The distance between two consecutive crests of a wave is called:

  • A Wavelength
  • B Amplitude
  • C Frequency
  • D Period
Permalink
Correct Answer: Option A — Wavelength
Explanation: Wavelength is defined as the distance between two successive points that are in phase, such as two consecutive crests or troughs, and it is typically measured in metres for a wave.
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Hard css fpsc Uploaded: 05 Aug 2026

What is the phenomenon where a material loses all electrical resistance below a critical temperature?

  • A Semiconduction
  • B Ferromagnetism
  • C Paramagnetism
  • D Superconductivity
Permalink
Correct Answer: Option D — Superconductivity
Explanation: Superconductivity is the phenomenon where certain materials exhibit zero electrical resistance below a critical temperature allowing current to flow indefinitely without energy loss.
Submitted by: PaperMCQs
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