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CSS MCQs

Civil Superior Services — Complete MCQ Bank

51 Questions
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1
Physics Medium

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

  • AVoltmeter
  • BOhmmeter
  • CAmmeter
  • DGalvanometer
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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
2
Physics Hard

Which fundamental force is responsible for radioactive beta decay?

  • AGravitational force
  • BElectromagnetic force
  • CStrong nuclear force
  • DWeak nuclear force
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Correct Answer: Option D — Weak nuclear force
Explanation: The weak nuclear force is responsible for radioactive beta decay where a neutron transforms into a proton by emitting an electron and an antineutrino.
Submitted by: PaperMCQs
3
Physics Hard

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

  • AElectromagnetic force
  • BGravitational force
  • CStrong nuclear force
  • DWeak nuclear force
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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
4
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
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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
5
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
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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
6
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
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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
7
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
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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
8
Physics Hard

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

  • AContinuous spectrum
  • BLine emission spectrum
  • CAbsorption spectrum
  • DBand spectrum
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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
9
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
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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
10
Physics Hard

Which type of mirror is used in reflecting telescopes?

  • APlane mirror
  • BParabolic concave mirror
  • CConvex mirror
  • DCylindrical mirror
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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
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