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Physics MCQs

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161
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
162
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
Permalink
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
163
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
Permalink
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.
Submitted by: PaperMCQs
164
Medium ppsc Uploaded: 06 Aug 2026

What is the unit of capacitance?

  • A Farad
  • B Henry
  • C Ohm
  • D Weber
Permalink
Correct Answer: Option A — Farad
Explanation: The Farad (F) is the SI unit of electrical capacitance, named after Michael Faraday. It measures a capacitor's ability to store electric charge per unit voltage, with most practical capacitors having capacitance values in microfarads or picofarads.
Submitted by: PaperMCQs
165
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
Permalink
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.
Submitted by: PaperMCQs
166
Easy fpsc Uploaded: 17 Aug 2026

The power of a convex lens is considered:

  • A Undefined
  • B Zero
  • C Positive
  • D Negative
Permalink
Correct Answer: Option C — Positive
Explanation: The optical power of a convex, or converging, lens is conventionally taken as positive because it converges parallel rays of light to a real focal point on the opposite side of the lens.
Submitted by: PaperMCQs
167
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
Permalink
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.
Submitted by: PaperMCQs
168
Medium fpsc Uploaded: 06 Aug 2026

What is the term for the maximum displacement of a wave from its rest position?

  • A Wavelength
  • B Frequency
  • C Amplitude
  • D Period
Permalink
Correct Answer: Option C — Amplitude
Explanation: Amplitude represents the maximum displacement of particles from their equilibrium position as a wave passes through a medium. Greater amplitude corresponds to louder sound or brighter light, depending on the type of wave involved.
Submitted by: PaperMCQs
169
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
170
Easy nts Uploaded: 17 Aug 2026

The commercial unit of electrical energy is the:

  • A Kilowatt-hour
  • B Ampere-hour
  • C Watt
  • D Joule
Permalink
Correct Answer: Option A — Kilowatt-hour
Explanation: The kilowatt-hour (kWh) is the standard commercial unit used to measure electrical energy consumption, representing the energy used by a one-kilowatt device operating continuously for one hour, as billed by utilities.
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171
Easy nts Uploaded: 17 Aug 2026

Which principle explains why a hydraulic lift can multiply force?

  • A Pascal's law
  • B Bernoulli's principle
  • C Newton's third law
  • D Archimedes' principle
Permalink
Correct Answer: Option A — Pascal's law
Explanation: Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished in all directions, allowing a small force on a small piston to produce a much larger force on a larger piston.
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172
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
Permalink
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
173
Easy nts Uploaded: 06 Aug 2026

What is the SI unit of electric resistance?

  • A Volt
  • B Ampere
  • C Farad
  • D Ohm
Permalink
Correct Answer: Option D — Ohm
Explanation: The Ohm (Ω) is the SI unit of electrical resistance, named after Georg Ohm. It measures the opposition a material offers to the flow of electric current, defined through Ohm's Law as voltage divided by current.
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174
Medium nts Uploaded: 06 Aug 2026

What is the term for the amount of matter contained in an object?

  • A Weight
  • B Volume
  • C Density
  • D Mass
Permalink
Correct Answer: Option D — Mass
Explanation: Mass is the quantity of matter contained within an object, remaining constant regardless of location. Unlike weight, which varies with gravitational pull, mass is measured in kilograms and represents a fundamental property of matter.
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175
Easy nts Uploaded: 17 Aug 2026

A convex lens is also known as a:

  • A Converging lens
  • B Cylindrical lens
  • C Plane lens
  • D Diverging lens
Permalink
Correct Answer: Option A — Converging lens
Explanation: A convex lens, which is thicker at the center than at the edges, is called a converging lens because it bends parallel rays of light inward to meet at a single focal point.
Submitted by: PaperMCQs
176
Medium ppsc Uploaded: 17 Aug 2026

A p-type semiconductor has an excess of:

  • A Electrons
  • B Protons
  • C Neutrons
  • D Holes
Permalink
Correct Answer: Option D — Holes
Explanation: A p-type semiconductor is created by doping a pure semiconductor with acceptor impurities that create an excess of positively charged holes, which act as the majority charge carriers in the material.
Submitted by: PaperMCQs
177
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of magnetic flux density?

  • A Tesla
  • B Weber
  • C Henry
  • D Farad
Permalink
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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178
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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179
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.
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180
Medium fpsc Uploaded: 17 Aug 2026

Which law states that induced EMF is proportional to the rate of change of magnetic flux?

  • A Coulomb's law
  • B Faraday's law
  • C Lenz's law
  • D Ohm's law
Permalink
Correct Answer: Option B — Faraday's law
Explanation: Faraday's law of electromagnetic induction states that the induced electromotive force in a circuit is directly proportional to the rate of change of magnetic flux through that circuit over time.
Submitted by: PaperMCQs
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