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Physics MCQs

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181
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
Permalink
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.
Submitted by: PaperMCQs
182
Medium pms Uploaded: 06 Aug 2026

Which law states that current through a conductor is directly proportional to voltage at constant temperature?

  • A Faraday's Law
  • B Coulomb's Law
  • C Ohm's Law
  • D Lenz's Law
Permalink
Correct Answer: Option C — Ohm's Law
Explanation: Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage applied across it, provided temperature remains constant. This relationship is expressed mathematically as voltage equals current times resistance.
Submitted by: PaperMCQs
183
Hard ppsc Uploaded: 17 Aug 2026

The distance between two consecutive crests of a wave is called:

  • A Wavelength
  • B Amplitude
  • C Frequency
  • D Period
Permalink
Correct Answer: Option A — Wavelength
Explanation: Wavelength is defined as the distance between two successive points that are in phase, such as two consecutive crests or troughs, and it is typically measured in metres for a wave.
Submitted by: PaperMCQs
184
Medium nts Uploaded: 17 Aug 2026

The neutron was discovered by:

  • A Ernest Rutherford
  • B J.J. Thomson
  • C Marie Curie
  • D James Chadwick
Permalink
Correct Answer: Option D — James Chadwick
Explanation: James Chadwick discovered the neutron in 1932, identifying it as an electrically neutral subatomic particle residing in the nucleus alongside protons, for which he was later awarded the Nobel Prize.
Submitted by: PaperMCQs
185
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

What is the unit of electrical resistance?

  • A Volt
  • B Ampere
  • C Watt
  • D Ohm
Permalink
Correct Answer: Option D — Ohm
Explanation: The Ohm named after German physicist Georg Simon Ohm is the SI unit of electrical resistance defined as the resistance that produces a potential difference of one volt per ampere.
Submitted by: PaperMCQs
186
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
Permalink
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.
Submitted by: PaperMCQs
187
Hard css fpsc Uploaded: 05 Aug 2026

What is the phenomenon where a material loses all electrical resistance below a critical temperature?

  • A Semiconduction
  • B Ferromagnetism
  • C Paramagnetism
  • D Superconductivity
Permalink
Correct Answer: Option D — Superconductivity
Explanation: Superconductivity is the phenomenon where certain materials exhibit zero electrical resistance below a critical temperature allowing current to flow indefinitely without energy loss.
Submitted by: PaperMCQs
188
Hard css fpsc ppsc Uploaded: 13 Jul 2026

What is the name of the force that holds protons and neutrons together inside the nucleus?

  • A Electromagnetic force
  • B Gravitational force
  • C Strong nuclear force
  • D Weak nuclear force
Permalink
Correct Answer: Option C — Strong nuclear force
Explanation: The strong nuclear force holds protons and neutrons together inside the atomic nucleus and is the strongest of the four fundamental forces operating only at very short ranges.
Submitted by: PaperMCQs
189
Hard pms Uploaded: 06 Aug 2026

What is the SI unit of magnetic flux?

  • A Henry
  • B Gauss
  • C Tesla
  • D Weber
Permalink
Correct Answer: Option D — Weber
Explanation: The Weber (Wb) is the SI unit of magnetic flux, named after Wilhelm Weber. It quantifies the total magnetic field passing through a given area, and is related to Tesla, the unit of magnetic flux density, by the area of the surface.
Submitted by: PaperMCQs
190
Easy ppsc Uploaded: 06 Aug 2026

Which scientist developed the theory of general relativity?

  • A Isaac Newton
  • B Niels Bohr
  • C Albert Einstein
  • D Max Planck
Permalink
Correct Answer: Option C — Albert Einstein
Explanation: Albert Einstein developed the theory of general relativity in 1915, describing gravity as the curvature of spacetime caused by mass and energy. This revolutionary theory reshaped scientific understanding of gravity, space, and time itself.
Submitted by: PaperMCQs
191
Easy ppsc Uploaded: 17 Aug 2026

The primary colors of light are:

  • A Red, orange, yellow
  • B Red, green, blue
  • C Cyan, magenta, yellow
  • D Red, yellow, blue
Permalink
Correct Answer: Option B — Red, green, blue
Explanation: The primary colors of light, used in additive color mixing, are red, green, and blue; combining these three colors in different proportions and intensities can produce nearly all other visible colors.
Submitted by: PaperMCQs
192
Hard css fpsc Uploaded: 13 Jul 2026

What is the phenomenon where certain materials offer zero electrical resistance below a critical temperature?

  • A Semiconduction
  • B Ferromagnetism
  • C Piezoelectricity
  • D Superconductivity
Permalink
Correct Answer: Option D — Superconductivity
Explanation: Superconductivity is the phenomenon where certain materials exhibit zero electrical resistance and expel magnetic fields when cooled below a characteristic critical temperature.
Submitted by: PaperMCQs
193
Easy nts Uploaded: 06 Aug 2026

Which type of current periodically reverses direction?

  • A Alternating current
  • B Direct current
  • C Static current
  • D Induced current
Permalink
Correct Answer: Option A — Alternating current
Explanation: Alternating current, or AC, periodically reverses direction as it flows through a circuit, unlike direct current which flows in one constant direction. Most household electrical power is supplied as alternating current for efficient long-distance transmission.
Submitted by: PaperMCQs
194
Easy fpsc Uploaded: 17 Aug 2026

Which mode of heat transfer does not require a medium?

  • A Conduction
  • B Convection
  • C Both conduction and convection
  • D Radiation
Permalink
Correct Answer: Option D — Radiation
Explanation: Radiation is the transfer of heat energy through electromagnetic waves and does not require any physical medium, which is why heat from the Sun can reach Earth through the vacuum of space.
Submitted by: PaperMCQs
195
Medium css Uploaded: 17 Aug 2026

The energy stored in a capacitor is given by the formula:

  • A CV
  • B (1/2)CV^2
  • C C/V
  • D V/C
Permalink
Correct Answer: Option B — (1/2)CV^2
Explanation: The electrical energy stored in a charged capacitor is given by the formula one-half times capacitance times voltage squared, representing the work done to charge the capacitor to that voltage.
Submitted by: PaperMCQs
196
Easy fpsc Uploaded: 17 Aug 2026

The power of a machine that does 1000 J of work in 10 seconds is:

  • A 10 W
  • B 1000 W
  • C 100 W
  • D 10000 W
Permalink
Correct Answer: Option C — 100 W
Explanation: Power equals work divided by time, so 1000 joules divided by 10 seconds gives 100 watts. Power measures the rate at which work is done or energy is transferred in a system.
Submitted by: PaperMCQs
197
Hard css fpsc Uploaded: 13 Jul 2026

What is the unit of magnetic flux in the SI system?

  • A Tesla
  • B Weber
  • C Ampere
  • D Farad
Permalink
Correct Answer: Option B — Weber
Explanation: The Weber is the SI unit of magnetic flux named after Wilhelm Eduard Weber and defined as the magnetic flux that when reduced to zero uniformly in one second induces an EMF of one volt.
Submitted by: PaperMCQs
198
Easy ppsc Uploaded: 06 Aug 2026

Which of the following is a scalar quantity?

  • A Mass
  • B Displacement
  • C Velocity
  • D Force
Permalink
Correct Answer: Option A — Mass
Explanation: Mass is a scalar quantity because it has only magnitude and no direction. Unlike vector quantities such as velocity, force, and displacement, which require both magnitude and direction to be fully described, mass is fully specified by a single number.
Submitted by: PaperMCQs
199
Medium css Uploaded: 06 Aug 2026

Which phenomenon causes a rainbow to form after rainfall?

  • A Reflection only
  • B Diffraction only
  • C Refraction and dispersion
  • D Polarization
Permalink
Correct Answer: Option C — Refraction and dispersion
Explanation: Rainbows form when sunlight enters raindrops, refracts, reflects internally, and disperses into its component colors as it exits. This combination of refraction and dispersion separates white light into the familiar spectrum of colors.
Submitted by: PaperMCQs
200
Medium pms Uploaded: 17 Aug 2026

Ultrasonic waves have frequencies:

  • A Below 20 Hz
  • B Exactly 20,000 Hz
  • C Between 20 Hz and 20,000 Hz
  • D Above 20,000 Hz
Permalink
Correct Answer: Option D — Above 20,000 Hz
Explanation: Ultrasonic waves are sound waves with frequencies higher than 20,000 Hz, beyond the upper limit of human hearing, and they are widely used in medical imaging, sonar, and industrial cleaning applications.
Submitted by: PaperMCQs
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