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Everyday Science MCQs

290 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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21
Medium fpsc ppsc nts

Which medical imaging technique uses high frequency sound waves to visualise internal organs?

  • A MRI
  • B Ultrasound
  • C X-ray
  • D CT scan
Permalink
Correct Answer: Option B — Ultrasound
Explanation: Ultrasound imaging uses high frequency sound waves above 20000 Hz that reflect off internal organs to produce real-time images widely used in pregnancy monitoring and organ diagnosis.
Submitted by: PaperMCQs
22
Medium fpsc ppsc nts

Which everyday material acts as a natural antibacterial due to its low water activity and acidic pH?

  • A Yogurt
  • B Vinegar
  • C Lemon juice
  • D Honey
Permalink
Correct Answer: Option D — Honey
Explanation: Honey acts as a natural antibacterial because its low moisture content high sugar concentration and slightly acidic pH create conditions inhospitable to most bacterial growth.
Submitted by: PaperMCQs
23
Easy fpsc ppsc nts

Which type of electromagnetic radiation is used in airport security scanners to see through luggage?

  • A X-rays
  • B Ultraviolet
  • C Infrared
  • D Gamma rays
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Correct Answer: Option A — X-rays
Explanation: X-rays are used in airport security scanners because they penetrate low density materials like clothing but are absorbed by denser materials like metals revealing hidden objects.
Submitted by: PaperMCQs
24
Medium fpsc ppsc nts

Which type of energy is stored in chemical bonds of fuel and released during combustion?

  • A Kinetic energy
  • B Nuclear energy
  • C Chemical energy
  • D Thermal energy
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Correct Answer: Option C — Chemical energy
Explanation: Chemical energy stored in fuel molecule bonds is released as heat and light during combustion converting chemical potential energy into thermal and radiant energy.
Submitted by: PaperMCQs
25
Medium fpsc ppsc nts

Which everyday observation demonstrates Newton's Third Law of Motion?

  • A A ball rolling down a slope
  • B A rocket expelling gases downward and moving upward
  • C Water flowing downhill
  • D A book resting on a table
Permalink
Correct Answer: Option B — A rocket expelling gases downward and moving upward
Explanation: A rocket demonstrates Newton's Third Law as hot gases expelled downward produce an equal and opposite upward thrust propelling the rocket into space without needing air to push against.
Submitted by: PaperMCQs
26
Easy ppsc nts

Which process in bread making causes dough to rise releasing CO2?

  • A Oxidation of flour
  • B Protein denaturation
  • C Fermentation by yeast
  • D Sublimation of water
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Correct Answer: Option C — Fermentation by yeast
Explanation: Yeast in bread dough ferments sugars and releases carbon dioxide gas which gets trapped in the dough forming bubbles causing it to rise and giving bread its light airy texture.
Submitted by: PaperMCQs
27
Medium fpsc ppsc nts

Which household chemical should never be mixed with bleach as it produces toxic chloramine gas?

  • A Ammonia
  • B Vinegar
  • C Baking soda
  • D Salt
Permalink
Correct Answer: Option A — Ammonia
Explanation: Mixing ammonia with bleach produces toxic chloramine gas which can cause severe respiratory irritation and damage making it essential to never combine these common household cleaners.
Submitted by: PaperMCQs
28
Medium fpsc ppsc nts

Which gas is most responsible for the depletion of the ozone layer?

  • A Carbon dioxide
  • B Methane
  • C Nitrogen oxide
  • D Chlorofluorocarbons
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Correct Answer: Option D — Chlorofluorocarbons
Explanation: Chlorofluorocarbons CFCs released from aerosols refrigerants and industrial processes rise to the stratosphere and break down ozone molecules depleting the protective ozone layer.
Submitted by: PaperMCQs
29
Easy fpsc ppsc nts

Which natural phenomenon occurs when the Earth's crust suddenly releases energy causing ground shaking?

  • A Earthquake
  • B Volcanic eruption
  • C Tsunami
  • D Cyclone
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Correct Answer: Option A — Earthquake
Explanation: An earthquake occurs when energy stored in the Earth's crust is suddenly released along fault lines causing seismic waves that make the ground shake and can cause widespread damage.
Submitted by: PaperMCQs
30
Easy fpsc ppsc nts

Which phenomenon explains why the handles of pots and pans are made from plastic or wood rather than metal?

  • A Metal is too heavy
  • B Plastic handles are magnetic
  • C Plastic and wood are poor heat conductors preventing burns
  • D Wood handles look better
Permalink
Correct Answer: Option C — Plastic and wood are poor heat conductors preventing burns
Explanation: Plastic and wood are poor conductors of heat meaning little heat transfers from the hot pot or pan to the handle preventing burns when cooking at high temperatures.
Submitted by: PaperMCQs
31
Medium fpsc ppsc nts

Which scientific instrument is used to measure very small distances such as the diameter of a wire or thickness of a sheet?

  • A Ruler
  • B Barometer
  • C Ammeter
  • D Vernier calliper
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Correct Answer: Option D — Vernier calliper
Explanation: A Vernier calliper is a precision measuring instrument used to measure small distances such as the diameter of a wire or the thickness of a sheet with high accuracy.
Submitted by: PaperMCQs
32
Easy fpsc ppsc nts

Which common safety device in electrical circuits breaks the circuit when current exceeds a safe limit to prevent fires?

  • A Switch
  • B Fuse
  • C Resistor
  • D Capacitor
Permalink
Correct Answer: Option B — Fuse
Explanation: A fuse is a safety device containing a thin wire that melts and breaks the circuit if current exceeds a safe limit protecting appliances and wiring from fire risk.
Submitted by: PaperMCQs
33
Medium fpsc ppsc nts

Which layer at the back of the eye contains photoreceptor cells called rods and cones that detect light?

  • A Iris
  • B Retina
  • C Cornea
  • D Lens
Permalink
Correct Answer: Option B — Retina
Explanation: The retina is the light-sensitive layer at the back of the eye containing rod cells for detecting light intensity and cone cells for detecting colour in bright conditions.
Submitted by: PaperMCQs
34
Medium fpsc ppsc nts

Which part of the human eye is responsible for forming a sharp image by focusing light onto the retina?

  • A Cornea only
  • B Iris
  • C Retina
  • D Lens
Permalink
Correct Answer: Option D — Lens
Explanation: The lens of the eye focuses light onto the retina by changing its shape in a process called accommodation allowing the eye to focus on objects at varying distances.
Submitted by: PaperMCQs
35
Medium fpsc ppsc nts

Which term describes the process of a solid changing directly to a gas without passing through the liquid state?

  • A Sublimation
  • B Evaporation
  • C Condensation
  • D Melting
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Correct Answer: Option A — Sublimation
Explanation: Sublimation is the process where a solid changes directly to a gas without passing through the liquid state as seen with dry ice carbon dioxide transforming to vapour.
Submitted by: PaperMCQs
36
Medium fpsc ppsc nts

Which common property of water describes water molecules being attracted to each other through hydrogen bonds?

  • A Adhesion
  • B Surface tension
  • C Viscosity
  • D Cohesion
Permalink
Correct Answer: Option D — Cohesion
Explanation: Cohesion describes the attraction of water molecules to each other through hydrogen bonds and is one reason water forms droplets and has relatively high surface tension.
Submitted by: PaperMCQs
37
Medium fpsc ppsc nts

Which common property of water is described as the tendency of water molecules to stick to other surfaces?

  • A Cohesion
  • B Surface tension
  • C Adhesion
  • D Viscosity
Permalink
Correct Answer: Option C — Adhesion
Explanation: Adhesion is the property that describes water molecules sticking to other surfaces such as glass or plant cell walls and is responsible for capillary action in plants.
Submitted by: PaperMCQs
38
Medium fpsc ppsc nts

Which everyday device measures body temperature by detecting the infrared radiation emitted from the ear canal or forehead?

  • A Traditional glass thermometer
  • B Infrared thermometer
  • C Alcohol thermometer
  • D Bimetallic thermometer
Permalink
Correct Answer: Option B — Infrared thermometer
Explanation: Infrared thermometers detect infrared radiation emitted from the ear canal or forehead and convert it into a temperature reading without making direct contact with the skin.
Submitted by: PaperMCQs
39
Medium fpsc ppsc nts

Which renewable energy source harnesses heat stored inside the Earth to generate electricity?

  • A Solar
  • B Wind
  • C Tidal
  • D Geothermal
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Correct Answer: Option D — Geothermal
Explanation: Geothermal energy harnesses heat from within the Earth using steam or hot water from underground reservoirs to drive turbines and generate electricity with minimal environmental impact.
Submitted by: PaperMCQs
40
Easy fpsc ppsc nts

Which common process happens when iron is exposed to oxygen and moisture over time forming a reddish-brown coating?

  • A Sublimation
  • B Reduction
  • C Neutralisation
  • D Oxidation forming iron oxide rust
Permalink
Correct Answer: Option D — Oxidation forming iron oxide rust
Explanation: Rusting is an oxidation process where iron reacts with oxygen and water to form iron oxide a reddish-brown substance that weakens and corrodes iron structures over time.
Submitted by: PaperMCQs
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