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Physics MCQs

127 Questions Subject Test
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Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the name of the quantum of electromagnetic radiation?

  • A Electron
  • B Neutron
  • C Proton
  • D Photon
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Correct Answer: Option D — Photon
Explanation: A photon is the quantum or smallest discrete unit of electromagnetic radiation carrying energy proportional to its frequency as described by Planck's equation E equals hf.
Submitted by: PaperMCQs
42
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the principle of conservation of momentum?

  • A Momentum increases with velocity only
  • B Total momentum of an isolated system remains constant
  • C Momentum equals mass times acceleration
  • D Momentum decreases with time
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Correct Answer: Option B — Total momentum of an isolated system remains constant
Explanation: The principle of conservation of momentum states that the total momentum of an isolated system remains constant provided no external forces act on it.
Submitted by: PaperMCQs
43
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
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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
44
Medium css Uploaded: 06 Aug 2026

What is the working principle of a transformer based on?

  • A Electrostatic induction
  • B Mechanical induction
  • C Thermal conduction
  • D Electromagnetic induction
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Correct Answer: Option D — Electromagnetic induction
Explanation: A transformer works on the principle of electromagnetic induction, discovered by Michael Faraday. It uses a changing magnetic field created by alternating current in the primary coil to induce a voltage in the secondary coil, enabling voltage transformation.
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45
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
46
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which law relates the force between two electric charges to the distance between them?

  • A Ohm's Law
  • B Coulomb's Law
  • C Faraday's Law
  • D Ampere's Law
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Correct Answer: Option B — Coulomb's Law
Explanation: Coulomb's Law states that the electrostatic force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
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47
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.
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48
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is absolute zero temperature in degrees Celsius?

  • A 0 degrees Celsius
  • B minus 100 degrees Celsius
  • C minus 273 degrees Celsius
  • D minus 373 degrees Celsius
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Correct Answer: Option C — minus 273 degrees Celsius
Explanation: Absolute zero is minus 273.15 degrees Celsius or 0 Kelvin the theoretical lowest temperature at which particles have minimum thermal motion.
Submitted by: PaperMCQs
49
Medium css Uploaded: 06 Aug 2026

What is the term for the angle at which incident light strikes a reflective surface?

  • A Angle of reflection
  • B Angle of refraction
  • C Angle of incidence
  • D Critical angle
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Correct Answer: Option C — Angle of incidence
Explanation: The angle of incidence is the angle between an incoming light ray and the normal, an imaginary line perpendicular to the reflecting surface at the point of contact, measured before the light reflects or refracts.
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50
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.
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51
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which phenomenon occurs when light bends around the edges of an obstacle or aperture?

  • A Refraction
  • B Reflection
  • C Diffraction
  • D Dispersion
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Correct Answer: Option C — Diffraction
Explanation: Diffraction is the bending of light waves around the edges of an obstacle or through an aperture and is most noticeable when the obstacle size is comparable to the wavelength.
Submitted by: PaperMCQs
52
Easy css Uploaded: 17 Aug 2026

The escape velocity from Earth's surface is approximately:

  • A 7.9 km/s
  • B 3.6 km/s
  • C 5.5 km/s
  • D 11.2 km/s
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Correct Answer: Option D — 11.2 km/s
Explanation: Escape velocity is the minimum speed an object must have to overcome Earth's gravitational pull without further propulsion, and for Earth this value is approximately 11.2 kilometres per second.
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53
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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54
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which type of radiation has the highest penetrating power?

  • A Alpha radiation
  • B Gamma radiation
  • C Beta radiation
  • D Neutron radiation
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Correct Answer: Option B — Gamma radiation
Explanation: Gamma radiation is highly penetrating electromagnetic radiation that can pass through most materials and requires dense materials like thick lead or concrete for adequate shielding.
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55
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.
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56
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.
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57
Medium css Uploaded: 06 Aug 2026

Which type of mirror is used in vehicle headlights to focus light?

  • A Plane mirror
  • B Convex mirror
  • C Cylindrical mirror
  • D Concave mirror
Permalink
Correct Answer: Option D — Concave mirror
Explanation: Concave mirrors are used in vehicle headlights because they can focus and direct parallel beams of light forward efficiently. Their curved reflective surface converges light rays, producing a strong, concentrated beam for illumination.
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58
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
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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.
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59
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
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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.
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60
Medium css Uploaded: 17 Aug 2026

The coefficient of friction depends upon:

  • A Velocity of the body
  • B Mass of the body
  • C Area of contact
  • D Nature of the surfaces in contact
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Correct Answer: Option D — Nature of the surfaces in contact
Explanation: The coefficient of friction is a dimensionless value that depends primarily on the roughness and material properties of the two surfaces in contact, not on the apparent contact area or the object's mass.
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