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Physics MCQs

442 Questions Subject Test
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141
Easy fpsc Uploaded: 17 Aug 2026

When resistors are connected in parallel, the total resistance:

  • A Increases
  • B Becomes infinite
  • C Remains the same as any one resistor
  • D Decreases below the smallest individual resistance
Permalink
Correct Answer: Option D — Decreases below the smallest individual resistance
Explanation: When resistors are connected in parallel, the reciprocal of the total resistance equals the sum of the reciprocals of each individual resistance, always resulting in a total less than the smallest resistor.
Submitted by: PaperMCQs
142
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
Permalink
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
143
Medium pms Uploaded: 06 Aug 2026

What is the unit used to measure the amount of electric charge?

  • A Ampere
  • B Volt
  • C Coulomb
  • D Ohm
Permalink
Correct Answer: Option C — Coulomb
Explanation: Electric charge is measured in Coulombs, named after French physicist Charles-Augustin de Coulomb. One coulomb represents the charge transported by a steady current of one ampere flowing for one second of time.
Submitted by: PaperMCQs
144
Easy fpsc Uploaded: 17 Aug 2026

Which gas law states that pressure is inversely proportional to volume at constant temperature?

  • A Boyle's law
  • B Gay-Lussac's law
  • C Charles's law
  • D Avogadro's law
Permalink
Correct Answer: Option A — Boyle's law
Explanation: Boyle's law states that at constant temperature, the pressure of a fixed amount of gas is inversely proportional to its volume, meaning that as volume decreases, pressure increases proportionally.
Submitted by: PaperMCQs
145
Easy ppsc Uploaded: 17 Aug 2026

Planck's constant relates the energy of a photon to its:

  • A Amplitude
  • B Frequency
  • C Speed
  • D Wavelength only
Permalink
Correct Answer: Option B — Frequency
Explanation: Planck's constant is the proportionality factor in the equation E equals h times f, relating the energy of a photon directly to its frequency, forming a cornerstone of quantum mechanics.
Submitted by: PaperMCQs
146
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which law states that every action has an equal and opposite reaction?

  • A Newton's First Law
  • B Newton's Second Law
  • C Newton's Third Law
  • D Law of Gravitation
Permalink
Correct Answer: Option C — Newton's Third Law
Explanation: Newton's Third Law states that for every action there is an equal and opposite reaction meaning forces always occur in pairs acting on different objects.
Submitted by: PaperMCQs
147
Easy nts Uploaded: 17 Aug 2026

The friction that opposes the start of motion between two surfaces is called:

  • A Rolling friction
  • B Static friction
  • C Fluid friction
  • D Kinetic friction
Permalink
Correct Answer: Option B — Static friction
Explanation: Static friction is the resistive force that must be overcome to initiate relative motion between two surfaces in contact; it generally has a higher maximum value than kinetic friction for the same surfaces.
Submitted by: PaperMCQs
148
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
149
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the terminal velocity of a falling object?

  • A Minimum speed during fall
  • B Speed at which object first starts moving
  • C Speed independent of mass
  • D Maximum speed reached when weight equals air resistance
Permalink
Correct Answer: Option D — Maximum speed reached when weight equals air resistance
Explanation: Terminal velocity is the constant maximum speed reached by a falling object when the downward gravitational force equals the upward air resistance force resulting in zero net force.
Submitted by: PaperMCQs
150
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
Permalink
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.
Submitted by: PaperMCQs
151
Easy ppsc Uploaded: 06 Aug 2026

What is the term for the total path length traveled by an object regardless of direction?

  • A Displacement
  • B Distance
  • C Velocity
  • D Acceleration
Permalink
Correct Answer: Option B — Distance
Explanation: Distance refers to the total path length covered by a moving object, regardless of direction, and is always a positive scalar quantity. It differs from displacement, which measures the straight-line change in position with direction.
Submitted by: PaperMCQs
152
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
Permalink
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
153
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
Permalink
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.
Submitted by: PaperMCQs
154
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
155
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
156
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
Permalink
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
157
Easy ppsc Uploaded: 17 Aug 2026

For every action, there is an equal and opposite reaction. This is:

  • A Newton's first law
  • B Newton's third law
  • C Kepler's law
  • D Newton's second law
Permalink
Correct Answer: Option B — Newton's third law
Explanation: Newton's third law states that forces always occur in pairs; when one body exerts a force on another, the second body exerts an equal and opposite force back on the first body.
Submitted by: PaperMCQs
158
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
Permalink
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
159
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
Permalink
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.
Submitted by: PaperMCQs
160
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
Permalink
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
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