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Physics MCQs

177 Questions Subject Test
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141
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Which law states that a planet sweeps out equal areas in equal times as it orbits the sun?

  • A Kepler's First Law
  • B Newton's Second Law
  • C Kepler's Second Law
  • D Kepler'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
142
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A real image can be formed on a screen, whereas a virtual image:

  • A Is always inverted
  • B Cannot be formed on a screen
  • C Is always magnified
  • D Can also be formed on a screen
Permalink
Correct Answer: Option B — Cannot be formed on a screen
Explanation: A real image is formed by the actual convergence of light rays and can be captured on a screen, while a virtual image is formed by the apparent divergence of rays and cannot be projected.
Submitted by: PaperMCQs
143
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Which law states that the induced EMF in a conductor is proportional to the rate of change of magnetic flux?

  • A Ohm's Law
  • B Coulomb's Law
  • C Ampere's Law
  • D Faraday's Law
Permalink
Correct Answer: Option D — Faraday's Law
Explanation: Faraday's Law of Electromagnetic Induction states that the magnitude of the induced EMF equals the rate of change of magnetic flux through a circuit forming the basis of generators and transformers.
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144
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What is the process by which heat transfers through direct contact between particles?

  • A Convection
  • B Conduction
  • C Radiation
  • D Insulation
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Correct Answer: Option B — Conduction
Explanation: Conduction is the transfer of heat through direct contact between particles in a solid material, as vibrating molecules pass kinetic energy to neighboring molecules. Metals are typically good conductors due to their free electrons.
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145
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Heat always flows from a body at:

  • A Higher temperature to lower temperature
  • B Zero temperature
  • C Equal temperature
  • D Lower temperature to higher temperature
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Correct Answer: Option A — Higher temperature to lower temperature
Explanation: According to the second law of thermodynamics, heat spontaneously flows from a region of higher temperature to a region of lower temperature until thermal equilibrium is reached between the two bodies.
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146
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Which effect describes the change in wavelength of X-rays scattered by electrons?

  • A Photoelectric effect
  • B Compton effect
  • C Zeeman effect
  • D Hall effect
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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.
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147
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What type of lens is used to correct short-sightedness (myopia)?

  • A Bifocal lens
  • B Cylindrical lens
  • C Concave lens
  • D Convex lens
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Correct Answer: Option C — Concave lens
Explanation: A concave (diverging) lens is used to correct myopia or short-sightedness. This condition occurs when the eye focuses images in front of the retina, and a concave lens diverges light rays before they enter the eye, correcting the focus point.
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148
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The energy released in nuclear reactions comes from the conversion of:

  • A Sound into light
  • B Chemical energy into heat
  • C Mass into energy
  • D Kinetic energy to heat
Permalink
Correct Answer: Option C — Mass into energy
Explanation: The enormous energy released in nuclear fission and fusion reactions originates from the conversion of a small amount of mass into energy, as described by Einstein's mass-energy equivalence relation.
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149
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Which colour of visible light has the shortest wavelength?

  • A Red
  • B Violet
  • C Orange
  • D Yellow
Permalink
Correct Answer: Option B — Violet
Explanation: Violet light has the shortest wavelength in the visible spectrum at approximately 380 to 450 nanometres and therefore the highest frequency and energy among visible colours.
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150
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The universal law of gravitation was proposed by:

  • A Galileo
  • B Einstein
  • C Newton
  • D Kepler
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Correct Answer: Option C — Newton
Explanation: Sir Isaac Newton formulated the universal law of gravitation, stating that every mass attracts every other mass with a force proportional to the product of their masses and inversely proportional to distance squared.
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151
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What does the term 'half-life' refer to in nuclear physics?

  • A Time for all radioactive atoms to decay
  • B Time for a nucleus to form
  • C Time for half of the radioactive atoms in a sample to decay
  • D Time for an atom to become stable
Permalink
Correct Answer: Option C — Time for half of the radioactive atoms in a sample to decay
Explanation: Half-life refers to the time required for half of the radioactive atoms in a given sample to undergo decay. This concept is essential in fields like radiometric dating, nuclear medicine, and understanding the stability of radioactive isotopes over time.
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152
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What is the critical angle in optics?

  • A Angle at which light travels along the boundary between two media
  • B Angle at which refraction stops
  • C Angle at which a lens focuses parallel rays
  • D Angle of maximum diffraction
Permalink
Correct Answer: Option A — Angle at which light travels along the boundary between two media
Explanation: The critical angle is the angle of incidence in the denser medium at which the refracted ray travels along the boundary and above which total internal reflection occurs.
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153
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Which quantity is defined as mass per unit volume?

  • A Specific gravity
  • B Weight
  • C Density
  • D Pressure
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Correct Answer: Option C — Density
Explanation: Density is defined as the mass of a substance divided by its volume, typically measured in kilograms per cubic metre, and it determines whether an object will float or sink in a given fluid.
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154
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Which type of mirror is used in reflecting telescopes?

  • A Plane mirror
  • B Parabolic concave mirror
  • C Convex mirror
  • D Cylindrical 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.
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155
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What is the term for the process by which a substance changes from liquid to gas below its boiling point?

  • A Boiling
  • B Condensation
  • C Sublimation
  • D Evaporation
Permalink
Correct Answer: Option D — Evaporation
Explanation: Evaporation is the gradual process by which molecules at a liquid's surface gain enough energy to escape into the gas phase, occurring at temperatures below the substance's boiling point, unlike boiling which occurs throughout the liquid.
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156
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What is the process by which an unstable atomic nucleus spontaneously emits radiation?

  • A Fission
  • B Fusion
  • C Diffraction
  • D Radioactive decay
Permalink
Correct Answer: Option D — Radioactive decay
Explanation: Radioactive decay is the spontaneous emission of radiation from an unstable atomic nucleus as it transforms into a more stable configuration releasing alpha beta or gamma radiation.
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157
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Which type of spectrum is produced when white light passes through a prism?

  • A Line emission spectrum
  • B Continuous spectrum
  • C Band spectrum
  • D Absorption spectrum
Permalink
Correct Answer: Option B — Continuous spectrum
Explanation: A prism produces a continuous spectrum showing a smooth gradation from red to violet as white light is dispersed into its component wavelengths through refraction.
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158
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What is the unit of power in the SI system?

  • A Watt
  • B Joule
  • C Newton
  • D Pascal
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Correct Answer: Option A — Watt
Explanation: The Watt is the SI unit of power named after James Watt and defined as one joule of energy transferred or converted per second.
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159
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Which scientist discovered electromagnetic induction demonstrating that a changing magnetic field induces current?

  • A Michael Faraday
  • B James Clerk Maxwell
  • C Nikola Tesla
  • D Heinrich Hertz
Permalink
Correct Answer: Option A — Michael Faraday
Explanation: Michael Faraday discovered electromagnetic induction in 1831 demonstrating that a changing magnetic flux through a conductor induces an electromotive force forming the basis of generators.
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160
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Which principle states that it is impossible to simultaneously know the exact position and momentum of a particle?

  • A Pauli Exclusion Principle
  • B Superposition Principle
  • C Correspondence Principle
  • D Heisenberg Uncertainty Principle
Permalink
Correct Answer: Option D — Heisenberg Uncertainty Principle
Explanation: Heisenberg's Uncertainty Principle states that the more precisely the position of a particle is determined the less precisely its momentum can be known and vice versa.
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