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Physics MCQs

177 Questions Subject Test
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101
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the centripetal force?

  • A Force pushing an object outward in circular motion
  • B Force causing linear acceleration
  • C Force equal to mass times velocity
  • D Force directed toward the centre of circular motion
Permalink
Correct Answer: Option D — Force directed toward the centre of circular motion
Explanation: Centripetal force is the force directed toward the centre of circular motion that keeps an object moving in a curved path and is provided by tension gravity or friction depending on the situation.
Submitted by: PaperMCQs
102
Hard css fpsc Uploaded: 13 Jul 2026

What is the SI unit of inductance?

  • A Farad
  • B Tesla
  • C Weber
  • D Henry
Permalink
Correct Answer: Option D — Henry
Explanation: The Henry is the SI unit of inductance named after American scientist Joseph Henry defined as the inductance that produces an EMF of one volt when current changes at one ampere per second.
Submitted by: PaperMCQs
103
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
104
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
105
Medium css fpsc ppsc Uploaded: 13 Jul 2026

What is the half-life of a radioactive substance?

  • A Time for the substance to completely decay
  • B Time for the radiation to halve in intensity only
  • C Time for half the nuclei to decay
  • D Time for temperature to reduce by half
Permalink
Correct Answer: Option C — Time for half the nuclei to decay
Explanation: Half-life is the time required for half of the radioactive nuclei in a sample to decay and it is a constant characteristic value specific to each radioactive isotope.
Submitted by: PaperMCQs
106
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
107
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
108
Medium fpsc Uploaded: 17 Aug 2026

According to Bernoulli's principle, as the speed of a fluid increases, its pressure:

  • A Decreases
  • B Increases
  • C Becomes zero
  • D Remains constant
Permalink
Correct Answer: Option A — Decreases
Explanation: Bernoulli's principle states that for an ideal flowing fluid, an increase in the speed of the fluid occurs simultaneously with a decrease in pressure or potential energy, explaining phenomena like airplane lift.
Submitted by: PaperMCQs
109
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Which experiment demonstrated that light behaves as a wave by producing an interference pattern?

  • A Young's double slit experiment
  • B Rutherford's gold foil experiment
  • C Millikan's oil drop experiment
  • D Compton scattering experiment
Permalink
Correct Answer: Option A — Young's double slit experiment
Explanation: Young's double slit experiment demonstrated light's wave nature by producing alternating bright and dark fringes on a screen when coherent light passed through two closely spaced slits.
Submitted by: PaperMCQs
110
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
111
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
112
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
113
Hard fpsc Uploaded: 06 Aug 2026

What is the term for the minimum energy needed to remove an electron from a metal surface?

  • A Ionization energy
  • B Binding energy
  • C Work function
  • D Activation energy
Permalink
Correct Answer: Option C — Work function
Explanation: Work function is the minimum energy required to remove an electron from the surface of a metal, a concept crucial to understanding the photoelectric effect. It varies between different metals and determines their electron emission properties under light exposure.
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114
Medium fpsc Uploaded: 17 Aug 2026

The critical angle is the angle of incidence for which the angle of refraction is:

  • A 90 degrees
  • B 0 degrees
  • C 180 degrees
  • D 45 degrees
Permalink
Correct Answer: Option A — 90 degrees
Explanation: The critical angle is defined as the specific angle of incidence in a denser medium at which the refracted ray travels exactly along the boundary, making the angle of refraction equal to 90 degrees.
Submitted by: PaperMCQs
115
Medium css fpsc ppsc Uploaded: 13 Jul 2026

Who explained the photoelectric effect and won the Nobel Prize for it in 1921?

  • A Albert Einstein
  • B Max Planck
  • C Niels Bohr
  • D Ernest Rutherford
Permalink
Correct Answer: Option A — Albert Einstein
Explanation: Albert Einstein explained the photoelectric effect in 1905 by proposing that light consists of discrete packets of energy called photons and won the Nobel Prize in Physics in 1921 for this work.
Submitted by: PaperMCQs
116
Easy fpsc ppsc nts Uploaded: 13 Jul 2026

Which device is used to measure the electric current flowing through a circuit?

  • A Voltmeter
  • B Ohmmeter
  • C Galvanometer
  • D Ammeter
Permalink
Correct Answer: Option D — Ammeter
Explanation: An ammeter is connected in series in a circuit to measure the electric current flowing through it and is designed with very low internal resistance to minimise circuit disturbance.
Submitted by: PaperMCQs
117
Medium fpsc ppsc nts Uploaded: 13 Jul 2026

Which scientist formulated the law of universal gravitation?

  • A Galileo Galilei
  • B Isaac Newton
  • C Michael Faraday
  • D James Clerk Maxwell
Permalink
Correct Answer: Option B — Isaac Newton
Explanation: Isaac Newton formulated the law of universal gravitation in 1687 stating that every mass attracts every other mass with a force proportional to their masses and inversely proportional to the square of the distance.
Submitted by: PaperMCQs
118
Easy fpsc Uploaded: 17 Aug 2026

An astronaut in orbit experiences apparent weightlessness because:

  • A There is no air in space
  • B The astronaut and spacecraft are in continuous free fall
  • C The astronaut has no mass
  • D Gravity is zero in space
Permalink
Correct Answer: Option B — The astronaut and spacecraft are in continuous free fall
Explanation: Astronauts in orbit feel weightless because both they and their spacecraft are continuously falling freely under gravity while moving forward, resulting in no normal contact force between the astronaut and the spacecraft.
Submitted by: PaperMCQs
119
Medium fpsc Uploaded: 06 Aug 2026

Which of the following is responsible for the twinkling of stars?

  • A Reflection of starlight
  • B Refraction of starlight in the atmosphere
  • C Diffraction of starlight
  • D Absorption of starlight
Permalink
Correct Answer: Option B — Refraction of starlight in the atmosphere
Explanation: The twinkling of stars occurs due to the refraction of starlight as it passes through Earth's constantly moving and varying-density atmosphere. These fluctuations bend the light unpredictably, causing the apparent brightness and position of stars to flicker.
Submitted by: PaperMCQs
120
Hard fpsc Uploaded: 06 Aug 2026

Which type of current flows consistently in a single direction?

  • A Direct current
  • B Alternating current
  • C Induced current
  • D Eddy current
Permalink
Correct Answer: Option A — Direct current
Explanation: Direct current flows consistently in a single direction through a circuit, unlike alternating current which periodically reverses. Batteries and solar cells typically produce direct current, widely used in electronic devices and low-voltage applications.
Submitted by: PaperMCQs
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