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Everyday Science MCQs

45 Questions Subject Test
Subject Preparation Guide

Prepare Everyday Science with confidence

Understand the science behind daily life through questions covering health, energy, environment, inventions and natural phenomena.

Human BodyEnergyEnvironmentScientific Inventions
Important for general science portions of CSS, PMS, FPSC and provincial tests.
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1
Hard fpsc

What is the main function of platelets in blood?

  • A Producing antibodies
  • B Fighting infection
  • C Carrying oxygen
  • D Blood clotting
Permalink
Correct Answer: Option D — Blood clotting
Explanation: Platelets are small cell fragments that gather at the site of a blood vessel injury, clumping together to form clots that stop bleeding. This process, called coagulation, is essential for wound healing and preventing excessive blood loss.
Submitted by: PaperMCQs
2
Hard fpsc

What is the term for animals without a backbone?

  • A Invertebrates
  • B Vertebrates
  • C Mammals
  • D Amphibians
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Correct Answer: Option A — Invertebrates
Explanation: Invertebrates are animals lacking a vertebral column or backbone, comprising over 95% of all animal species. Examples include insects, mollusks, and worms, showing remarkable diversity in form and habitat across the planet.
Submitted by: PaperMCQs
3
Hard fpsc

What is the main gas responsible for the ozone layer?

  • A Methane
  • B Carbon dioxide
  • C Ozone
  • D Oxygen
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Correct Answer: Option C — Ozone
Explanation: The ozone layer, composed of ozone molecules (O3), absorbs most of the sun's harmful ultraviolet radiation, protecting life on Earth. It is located in the stratosphere, roughly 15 to 35 kilometers above the surface.
Submitted by: PaperMCQs
4
Hard css fpsc

Which radiation type is emitted during beta decay converting a neutron into a proton?

  • A Alpha radiation
  • B Beta radiation
  • C Gamma radiation
  • D Neutron radiation
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Correct Answer: Option B — Beta radiation
Explanation: Beta radiation is emitted during beta decay when a neutron in the nucleus converts into a proton releasing a high energy electron or beta particle and an antineutrino.
Submitted by: PaperMCQs
5
Hard css fpsc

Which kidney process selectively returns useful substances like glucose back to the bloodstream?

  • A Ultrafiltration
  • B Secretion
  • C Selective reabsorption
  • D Excretion
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Correct Answer: Option C — Selective reabsorption
Explanation: Selective reabsorption occurs in the kidney tubules where useful substances including glucose amino acids water and ions are actively or passively returned to the bloodstream.
Submitted by: PaperMCQs
6
Hard css fpsc

Which vitamin deficiency causes pellagra characterised by dermatitis diarrhoea and dementia?

  • A Vitamin B1
  • B Vitamin B6
  • C Vitamin B3 Niacin
  • D Vitamin B12
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Correct Answer: Option C — Vitamin B3 Niacin
Explanation: Pellagra is caused by a deficiency of Vitamin B3 or Niacin and is characterised by the classic four Ds dermatitis diarrhoea dementia and if untreated death.
Submitted by: PaperMCQs
7
Hard css fpsc ppsc

Which famous experiment proved that the Earth orbits the Sun rather than the Sun orbiting the Earth?

  • A Galileo's telescope observations
  • B Newton's apple experiment
  • C Foucault pendulum demonstration
  • D Copernicus's naked eye observations
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Correct Answer: Option A — Galileo's telescope observations
Explanation: Galileo's telescope observations in 1610 of Jupiter's moons and Venus's phases provided key evidence supporting the heliocentric model that Earth orbits the Sun.
Submitted by: PaperMCQs
8
Hard css fpsc

Which phenomenon explains why sound travels faster in warm air than in cold air?

  • A Warm air molecules have less energy
  • B Warm air molecules move faster providing quicker transmission
  • C Cold air is denser blocking sound
  • D Sound speed is unaffected by temperature
Permalink
Correct Answer: Option B — Warm air molecules move faster providing quicker transmission
Explanation: In warmer air molecules have more kinetic energy and move faster which allows sound waves to be transmitted more quickly giving sound a higher speed in warm compared to cold air.
Submitted by: PaperMCQs
9
Hard css fpsc

Which common observation explains why sound seems louder when heard through walls compared to open air over long distances?

  • A Sound is louder in air
  • B Solids conduct sound more efficiently than air
  • C Walls amplify all frequencies
  • D Air absorbs sound more than solids
Permalink
Correct Answer: Option B — Solids conduct sound more efficiently than air
Explanation: Sound travels more efficiently through solid materials like walls because the denser medium provides better particle-to-particle contact for transmitting sound waves with less energy loss.
Submitted by: PaperMCQs
10
Hard css fpsc ppsc

Which photoreceptor cells in the eye are responsible for vision in dim light and cannot distinguish colours?

  • A Cone cells
  • B Ganglion cells
  • C Bipolar cells
  • D Rod cells
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Correct Answer: Option D — Rod cells
Explanation: Rod cells are the photoreceptors in the retina specialised for detecting light in dim conditions allowing vision in low light but they cannot distinguish between colours.
Submitted by: PaperMCQs
11
Hard css fpsc ppsc

Which photoreceptor cells in the eye are responsible for colour vision and function best in bright light?

  • A Cone cells
  • B Rod cells
  • C Ganglion cells
  • D Bipolar cells
Permalink
Correct Answer: Option A — Cone cells
Explanation: Cone cells are the photoreceptors in the retina responsible for colour vision and sharp detail and they function best under bright lighting conditions unlike rod cells.
Submitted by: PaperMCQs
12
Hard css fpsc

Which term describes the process by which a gas changes directly to a solid without passing through the liquid state?

  • A Sublimation
  • B Evaporation
  • C Condensation
  • D Deposition
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Correct Answer: Option D — Deposition
Explanation: Deposition is the reverse of sublimation where a gas changes directly into a solid bypassing the liquid state as seen when water vapour freezes directly into frost.
Submitted by: PaperMCQs
13
Hard css fpsc ppsc

Which substance in a catalytic converter helps reduce harmful vehicle exhaust emissions?

  • A Iron
  • B Platinum and palladium
  • C Copper
  • D Aluminium
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Correct Answer: Option B — Platinum and palladium
Explanation: Catalytic converters use platinum and palladium as catalysts to convert harmful exhaust gases like carbon monoxide nitrogen oxides and unburnt hydrocarbons into less harmful substances.
Submitted by: PaperMCQs
14
Hard css fpsc

Which term describes the minimum energy required to start a chemical reaction?

  • A Kinetic energy
  • B Potential energy
  • C Activation energy
  • D Chemical energy
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Correct Answer: Option C — Activation energy
Explanation: Activation energy is the minimum energy required to initiate a chemical reaction by breaking bonds in reactant molecules so that new bonds can form in the products.
Submitted by: PaperMCQs
15
Hard css fpsc ppsc

Which common kitchen appliance uses the principle of electromagnetic induction specifically to heat food through magnetic coupling?

  • A Induction cooker
  • B Microwave oven
  • C Conventional oven
  • D Electric kettle
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Correct Answer: Option A — Induction cooker
Explanation: An induction cooker uses electromagnetic induction to generate electric currents directly in ferromagnetic cookware producing heat through electrical resistance within the pot or pan itself.
Submitted by: PaperMCQs
16
Hard css fpsc

Which everyday process causes wood to appear to shrink and blacken when burned but conserves matter overall?

  • A Physical change only
  • B Sublimation
  • C Condensation
  • D Conservation of matter through combustion
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Correct Answer: Option D — Conservation of matter through combustion
Explanation: When wood burns carbon dioxide water vapour and ash are produced conserving total matter according to the law of conservation of mass even though the solid wood appears to vanish.
Submitted by: PaperMCQs
17
Hard css fpsc

Which common household chemical is produced when electricity is passed through brine in a process called chlor-alkali?

  • A Sodium hydroxide and chlorine gas
  • B Vinegar
  • C Bleach
  • D Hydrogen peroxide
Permalink
Correct Answer: Option A — Sodium hydroxide and chlorine gas
Explanation: Electrolysis of brine sodium chloride solution produces sodium hydroxide chlorine gas and hydrogen gas through the chlor-alkali process used widely in chemical industry.
Submitted by: PaperMCQs
18
Hard css fpsc ppsc

Which type of joint is found in the skull where bones are fixed together and allow no movement?

  • A Fixed joint or suture
  • B Ball and socket
  • C Hinge joint
  • D Gliding joint
Permalink
Correct Answer: Option A — Fixed joint or suture
Explanation: Fixed joints called sutures are found in the skull where bones are tightly interlocked by fibrous tissue allowing no movement providing protection to the brain.
Submitted by: PaperMCQs
19
Hard css fpsc

Which phenomenon explains why distant mountains sometimes appear bluish in colour?

  • A Reflection from ocean
  • B Mountain mineral colour
  • C Light absorption by plants
  • D Atmospheric scattering of light
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Correct Answer: Option D — Atmospheric scattering of light
Explanation: Distant mountains appear bluish because of atmospheric scattering where air molecules and particles scatter shorter blue wavelengths of light more effectively creating a blue haze over distances.
Submitted by: PaperMCQs
20
Hard css fpsc

Which property of a magnet means it will always realign itself to point in a north-south direction if freely suspended?

  • A Directive property
  • B Magnetic flux
  • C Magnetic polarity
  • D Magnetic saturation
Permalink
Correct Answer: Option A — Directive property
Explanation: The directive property of a magnet means that when freely suspended it aligns itself along the Earth's magnetic field pointing in a north-south direction making it useful as a compass.
Submitted by: PaperMCQs
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