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Physics MCQs

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

MechanicsWavesElectricityModern Physics
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61
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is meant by the term inertia in physics?

  • A The tendency of an object to resist changes in its state of motion
  • B The tendency of an object to accelerate
  • C The force of gravity on an object
  • D The energy stored in a moving object
Permalink
Correct Answer: Option A — The tendency of an object to resist changes in its state of motion
Explanation: Inertia is the property of matter by which an object resists changes to its state of rest or uniform motion in a straight line as described by Newton's First Law.
Submitted by: PaperMCQs
62
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which device converts electrical energy into mechanical energy?

  • A Generator
  • B Transformer
  • C Electric motor
  • D Capacitor
Permalink
Correct Answer: Option C — Electric motor
Explanation: An electric motor converts electrical energy into mechanical energy using the interaction between electric current and a magnetic field to produce rotational motion.
Submitted by: PaperMCQs
63
Medium nts Uploaded: 17 Aug 2026

Which of the following best defines heat?

  • A Energy stored in a body
  • B Total kinetic energy of molecules
  • C Force between molecules
  • D Energy transferred due to temperature difference
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Correct Answer: Option D — Energy transferred due to temperature difference
Explanation: Heat is defined as the transfer of thermal energy between two systems or objects due to a temperature difference between them, always flowing spontaneously from hotter to colder regions.
Submitted by: PaperMCQs
64
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which type of wave does not require a medium to travel?

  • A Sound wave
  • B Water wave
  • C Seismic wave
  • D Electromagnetic wave
Permalink
Correct Answer: Option D — Electromagnetic wave
Explanation: Electromagnetic waves such as light radio waves and X-rays can travel through a vacuum without requiring a medium distinguishing them from mechanical waves like sound.
Submitted by: PaperMCQs
65
Medium fpsc ppsc nts Uploaded: 05 Aug 2026

Which device converts light energy directly into electrical energy using the photovoltaic effect?

  • A Generator
  • B Transformer
  • C Solar cell
  • D Battery
Permalink
Correct Answer: Option C — Solar cell
Explanation: A solar cell converts light energy directly into electrical energy using the photovoltaic effect when photons knock electrons free in semiconductor materials creating an electric current.
Submitted by: PaperMCQs
66
Easy nts Uploaded: 06 Aug 2026

What is the phenomenon called when light changes speed and direction while passing from one medium to another?

  • A Reflection
  • B Interference
  • C Refraction
  • D Polarization
Permalink
Correct Answer: Option C — Refraction
Explanation: Refraction is the bending of light as it passes from one transparent medium to another with a different optical density, caused by a change in the speed of light. This phenomenon explains why a straw appears bent when placed in water.
Submitted by: PaperMCQs
67
Medium nts Uploaded: 06 Aug 2026

What is the term for the smallest particle of an element that retains its chemical properties?

  • A Molecule
  • B Ion
  • C Atom
  • D Electron
Permalink
Correct Answer: Option C — Atom
Explanation: An atom is the smallest unit of an element that retains all the chemical properties of that element. Atoms consist of a nucleus containing protons and neutrons, surrounded by orbiting electrons in defined energy levels.
Submitted by: PaperMCQs
68
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the speed of light in a vacuum?

  • A 3 x 10 to the power 6 m/s
  • B 3 x 10 to the power 10 m/s
  • C 3 x 10 to the power 4 m/s
  • D 3 x 10 to the power 8 m/s
Permalink
Correct Answer: Option D — 3 x 10 to the power 8 m/s
Explanation: The speed of light in a vacuum is approximately 3 x 10 to the power of 8 metres per second or 300000 kilometres per second and is denoted by the letter c.
Submitted by: PaperMCQs
69
Medium nts Uploaded: 17 Aug 2026

Which particle has no electric charge and is found in the nucleus?

  • A Proton
  • B Electron
  • C Neutron
  • D Positron
Permalink
Correct Answer: Option C — Neutron
Explanation: The neutron is a subatomic particle with no net electric charge, residing in the nucleus of an atom alongside positively charged protons, and it contributes to the overall mass of the atom.
Submitted by: PaperMCQs
70
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What type of lens is thicker at the centre than at the edges?

  • A Concave lens
  • B Plano-concave lens
  • C Biconcave lens
  • D Convex lens
Permalink
Correct Answer: Option D — Convex lens
Explanation: A convex lens also called a converging lens is thicker at the centre than at the edges and brings parallel rays of light to a focus at a point called the focal point.
Submitted by: PaperMCQs
71
Medium nts Uploaded: 17 Aug 2026

If the net force on a body is zero, the body is said to be in:

  • A Accelerated motion
  • B Circular motion
  • C Equilibrium
  • D Free fall
Permalink
Correct Answer: Option C — Equilibrium
Explanation: A body is in equilibrium when the net force acting upon it is zero, meaning it either remains at rest or continues moving with constant velocity, in accordance with Newton's first law of motion.
Submitted by: PaperMCQs
72
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of pressure?

  • A Newton
  • B Joule
  • C Pascal
  • D Watt
Permalink
Correct Answer: Option C — Pascal
Explanation: The Pascal is the SI unit of pressure named after Blaise Pascal and defined as one Newton of force per square metre of area.
Submitted by: PaperMCQs
73
Easy nts Uploaded: 17 Aug 2026

The bending of light as it passes from one medium to another is called:

  • A Refraction
  • B Reflection
  • C Diffraction
  • D Polarization
Permalink
Correct Answer: Option A — Refraction
Explanation: Refraction is the bending of light as it travels from one transparent medium into another with a different optical density, caused by the change in the speed of light between the two media.
Submitted by: PaperMCQs
74
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which particle carries a positive electric charge in an atom?

  • A Electron
  • B Neutron
  • C Proton
  • D Photon
Permalink
Correct Answer: Option C — Proton
Explanation: Protons are positively charged subatomic particles located in the nucleus of an atom with a charge equal in magnitude but opposite in sign to that of an electron.
Submitted by: PaperMCQs
75
Hard nts Uploaded: 06 Aug 2026

What is the term for the total energy possessed by a moving fluid, combining pressure, kinetic, and potential energy?

  • A Continuity equation
  • B Fluid dynamics
  • C Bernoulli's principle
  • D Flow rate
Permalink
Correct Answer: Option C — Bernoulli's principle
Explanation: Bernoulli's principle states that within a flowing fluid, an increase in speed occurs simultaneously with a decrease in pressure, reflecting the conservation of total mechanical energy along a streamline in fluid dynamics.
Submitted by: PaperMCQs
76
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the SI unit of energy?

  • A Joule
  • B Watt
  • C Newton
  • D Pascal
Permalink
Correct Answer: Option A — Joule
Explanation: The Joule is the SI unit of energy defined as the work done when a force of one Newton moves an object one metre in the direction of the force.
Submitted by: PaperMCQs
77
Easy nts Uploaded: 17 Aug 2026

A body moving with uniform velocity has:

  • A Zero acceleration
  • B Zero velocity
  • C Zero displacement
  • D Varying speed
Permalink
Correct Answer: Option A — Zero acceleration
Explanation: When a body moves with uniform velocity, both its speed and direction remain constant, meaning there is no change in velocity over time and hence the acceleration of the body is zero.
Submitted by: PaperMCQs
78
Easy fpsc ppsc nts Uploaded: 05 Aug 2026

Which property of a wave is the distance measured from one crest to the next crest?

  • A Amplitude
  • B Frequency
  • C Wavelength
  • D Speed
Permalink
Correct Answer: Option C — Wavelength
Explanation: Wavelength is the distance between two successive identical points on a wave such as crest to crest and is inversely related to frequency for waves travelling at the same speed.
Submitted by: PaperMCQs
79
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

What is the function of an optical fibre?

  • A To store electrical energy
  • B To transmit light signals over long distances using total internal reflection
  • C To measure temperature
  • D To amplify sound waves
Permalink
Correct Answer: Option B — To transmit light signals over long distances using total internal reflection
Explanation: Optical fibres transmit light signals over long distances using total internal reflection within a glass or plastic fibre and are the backbone of modern high-speed internet communications.
Submitted by: PaperMCQs
80
Medium nts Uploaded: 06 Aug 2026

Which unit measures the rate of energy transfer in an electrical circuit?

  • A Volt
  • B Watt
  • C Ampere
  • D Ohm
Permalink
Correct Answer: Option B — Watt
Explanation: The watt is the unit measuring the rate of energy transfer or power consumption within an electrical circuit, calculated by multiplying voltage and current. It quantifies how quickly electrical devices use or generate energy.
Submitted by: PaperMCQs
Practiced MCQs0 / 118