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Physics MCQs

159 Questions Subject Test
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41
Medium ppsc Uploaded: 06 Aug 2026

Which quantity describes the amount of heat energy required to raise the temperature of a substance?

  • A Specific heat capacity
  • B Latent heat
  • C Thermal conductivity
  • D Heat capacity
Permalink
Correct Answer: Option A — Specific heat capacity
Explanation: Specific heat capacity refers to the amount of heat energy needed to raise the temperature of one kilogram of a substance by one degree Celsius, varying between materials based on their molecular structure and composition.
Submitted by: PaperMCQs
42
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which particle in an atom has no electric charge?

  • A Proton
  • B Electron
  • C Neutron
  • D Photon
Permalink
Correct Answer: Option C — Neutron
Explanation: Neutrons are electrically neutral subatomic particles found in the nucleus of an atom alongside protons and their presence affects the mass and stability of the nucleus.
Submitted by: PaperMCQs
43
Medium ppsc Uploaded: 17 Aug 2026

The property of a fluid that resists relative motion between its layers is called:

  • A Viscosity
  • B Buoyancy
  • C Density
  • D Surface tension
Permalink
Correct Answer: Option A — Viscosity
Explanation: Viscosity is the internal resistance of a fluid to flow, arising from friction between adjacent layers moving at different velocities; higher viscosity fluids, like honey, flow more slowly than water.
Submitted by: PaperMCQs
44
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
Permalink
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
45
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which property of a body is measured by the amount of matter it contains?

  • A Weight
  • B Density
  • C Mass
  • D Volume
Permalink
Correct Answer: Option C — Mass
Explanation: Mass is the measure of the amount of matter contained in a body and remains constant regardless of location unlike weight which depends on gravitational field strength.
Submitted by: PaperMCQs
46
Medium css fpsc ppsc Uploaded: 05 Aug 2026

Which principle states that pressure in a static fluid increases with depth depending on fluid density?

  • A Bernoulli's Principle
  • B Archimedes' Principle
  • C Pascal's Principle
  • D Hydrostatic pressure principle
Permalink
Correct Answer: Option D — Hydrostatic pressure principle
Explanation: The hydrostatic pressure principle states that pressure in a static fluid increases linearly with depth depending on fluid density and gravitational acceleration expressed as P equals rho g h.
Submitted by: PaperMCQs
47
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which instrument is used to detect and measure very small electric currents?

  • A Voltmeter
  • B Ohmmeter
  • C Ammeter
  • D Galvanometer
Permalink
Correct Answer: Option D — Galvanometer
Explanation: A galvanometer is a sensitive instrument used to detect and measure very small electric currents through the deflection of a needle in a magnetic field.
Submitted by: PaperMCQs
48
Medium ppsc Uploaded: 06 Aug 2026

Which of the following is a vector quantity?

  • A Speed
  • B Energy
  • C Momentum
  • D Temperature
Permalink
Correct Answer: Option C — Momentum
Explanation: Momentum is a vector quantity because it possesses both magnitude and direction, calculated as the product of an object's mass and velocity. Unlike scalar quantities such as speed or temperature, momentum's direction matters in physical calculations and collisions.
Submitted by: PaperMCQs
49
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
Permalink
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
50
Medium ppsc Uploaded: 06 Aug 2026

What is the term for the change in velocity of an object per unit time?

  • A Acceleration
  • B Speed
  • C Momentum
  • D Displacement
Permalink
Correct Answer: Option A — Acceleration
Explanation: Acceleration measures the rate of change of an object's velocity over time, whether the object speeds up, slows down, or changes direction. It is a vector quantity, calculated as change in velocity divided by time.
Submitted by: PaperMCQs
51
Medium ppsc Uploaded: 17 Aug 2026

A projectile launched at 45 degrees achieves:

  • A Maximum height
  • B Minimum time of flight
  • C Zero range
  • D Maximum range
Permalink
Correct Answer: Option D — Maximum range
Explanation: For a given initial speed, a projectile launched at a 45-degree angle achieves the maximum horizontal range because it optimally balances the vertical and horizontal components of the initial velocity.
Submitted by: PaperMCQs
52
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the principle behind a periscope?

  • A Reflection of light using two parallel mirrors
  • B Diffraction of light
  • C Refraction through lenses
  • D Polarisation of light
Permalink
Correct Answer: Option A — Reflection of light using two parallel mirrors
Explanation: A periscope uses two parallel mirrors inclined at 45 degrees to reflect light allowing observation above or around obstacles without direct line of sight.
Submitted by: PaperMCQs
53
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the acceleration due to gravity at the surface of the Earth?

  • A 8.9 m/s squared
  • B 10.8 m/s squared
  • C 9.8 m/s squared
  • D 7.8 m/s squared
Permalink
Correct Answer: Option C — 9.8 m/s squared
Explanation: The standard acceleration due to gravity at the Earth's surface is approximately 9.8 metres per second squared commonly rounded to 10 m/s squared in simple calculations.
Submitted by: PaperMCQs
54
Easy ppsc Uploaded: 17 Aug 2026

Gravitational potential energy between two masses is always:

  • A Zero
  • B Infinite
  • C Positive
  • D Negative
Permalink
Correct Answer: Option D — Negative
Explanation: Gravitational potential energy is conventionally taken as negative because it is defined as zero at infinite separation, and energy must be added to separate two attracting masses further apart from each other.
Submitted by: PaperMCQs
55
Easy ppsc Uploaded: 06 Aug 2026

What is the term used for the resistance of a body to change its state of motion?

  • A Inertia
  • B Acceleration
  • C Velocity
  • D Momentum
Permalink
Correct Answer: Option A — Inertia
Explanation: Inertia is the inherent resistance of an object to any change in its state of motion, whether at rest or moving at constant velocity. This property, described in Newton's First Law, depends directly on the mass of the object.
Submitted by: PaperMCQs
56
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
57
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
58
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
59
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
60
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
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