Join WhatsApp ChannelDaily MCQs & Exam Updates

CSS MCQs

Civil Superior Services — Complete MCQ Bank

899 Questions
Exam Preparation Guide

How to prepare for CSS

CSS is Pakistan’s premier federal competitive examination. Strong preparation requires conceptual clarity, broad general knowledge and consistent practice across compulsory and optional areas.

Pakistan AffairsCurrent AffairsEnglishEveryday Science
Combine daily MCQ practice with analytical reading, vocabulary building and regular revision of national and international affairs.
Start PracticingTake a Mock Test
CSS preparation illustration
All Subjects Biology Chemistry Computer Science Current Affairs English Everyday Science General Knowledge Islamic Studies Mathematics Pakistan Studies Physics
101
Physics Hard

Which law states that a planet sweeps out equal areas in equal times as it orbits the sun?

  • AKepler's First Law
  • BNewton's Second Law
  • CKepler's Second Law
  • DKepler's Third Law
Permalink
Correct Answer: Option C — Kepler's Second Law
Explanation: Kepler's Second Law states that a line joining a planet to the sun sweeps equal areas in equal time intervals meaning planets move faster when closer to the sun.
Submitted by: PaperMCQs
102
Physics Medium

Which law states that planets move in elliptical orbits with the sun at one focus?

  • ANewton's Law of Gravitation
  • BGalileo's Law of Motion
  • CKepler's First Law
  • DHubble's Law
Permalink
Correct Answer: Option C — Kepler's First Law
Explanation: Kepler's First Law of Planetary Motion states that all planets orbit the sun in elliptical paths with the sun located at one of the two foci of the ellipse.
Submitted by: PaperMCQs
103
Physics Medium

What is the centripetal force?

  • AForce pushing an object outward in circular motion
  • BForce causing linear acceleration
  • CForce equal to mass times velocity
  • DForce 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
104
Physics Hard

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

  • AHeisenberg Uncertainty Principle
  • BSuperposition Principle
  • CAufbau Principle
  • DPauli Exclusion Principle
Permalink
Correct Answer: Option D — Pauli Exclusion Principle
Explanation: The Pauli Exclusion Principle states that no two electrons in an atom can have identical sets of all four quantum numbers meaning each orbital can hold at most two electrons with opposite spins.
Submitted by: PaperMCQs
105
Physics Hard

Which type of spectrum consists of specific discrete wavelengths emitted by excited atoms?

  • AContinuous spectrum
  • BLine emission spectrum
  • CAbsorption spectrum
  • DBand spectrum
Permalink
Correct Answer: Option B — Line emission spectrum
Explanation: A line emission spectrum consists of discrete bright lines at specific wavelengths produced when electrons in excited atoms fall to lower energy levels releasing photons of specific energies.
Submitted by: PaperMCQs
106
Physics Hard

What is the phenomenon of resonance in physics?

  • AIncrease in amplitude when driving frequency matches natural frequency
  • BDecrease in amplitude of oscillations over time
  • CThe bending of waves around obstacles
  • DSplitting of white light into colours
Permalink
Correct Answer: Option A — Increase in amplitude when driving frequency matches natural frequency
Explanation: Resonance occurs when a system is driven at its natural frequency causing the amplitude of oscillations to increase dramatically and can be seen in musical instruments and bridges.
Submitted by: PaperMCQs
107
Physics Hard

Which type of mirror is used in reflecting telescopes?

  • APlane mirror
  • BParabolic concave mirror
  • CConvex mirror
  • DCylindrical mirror
Permalink
Correct Answer: Option B — Parabolic concave mirror
Explanation: Reflecting telescopes use parabolic concave mirrors to collect and focus parallel rays of light from distant stars to a single focal point without chromatic aberration.
Submitted by: PaperMCQs
108
Physics Hard

Which effect causes the apparent change in frequency of light from a moving star?

  • APhotoelectric effect
  • BCompton effect
  • CZeeman effect
  • DDoppler effect
Permalink
Correct Answer: Option D — Doppler effect
Explanation: The Doppler effect causes light from a star moving away from us to shift to longer wavelengths called red shift while light from an approaching star shifts to shorter wavelengths called blue shift.
Submitted by: PaperMCQs
109
Physics Hard

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

  • ATesla
  • BWeber
  • CAmpere
  • DFarad
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
110
Physics Hard

Which effect describes the change in wavelength of X-rays scattered by electrons?

  • APhotoelectric effect
  • BCompton effect
  • CZeeman effect
  • DHall effect
Permalink
Correct Answer: Option B — Compton effect
Explanation: The Compton effect describes the increase in wavelength of X-rays or gamma rays when they scatter off electrons demonstrating the particle nature of electromagnetic radiation.
Submitted by: PaperMCQs
Other Exams
CSS MCQs PMS MCQs FPSC MCQs PPSC MCQs NTS MCQs
Mock Tests
Quick Test (20 Q) Full Mock (60 Q)