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Everyday Science MCQs

387 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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81
Medium fpsc

What is the pH value of pure water?

  • A 9
  • B 5
  • C 7
  • D 3
Permalink
Correct Answer: Option C — 7
Explanation: Pure water has a pH of 7, making it neutral on the pH scale that ranges from 0 to 14. Values below 7 indicate acidity while values above 7 indicate alkalinity, important in chemistry and biology.
Submitted by: PaperMCQs
82
Easy nts

Which organ in the human body is primarily responsible for filtering blood?

  • A Lungs
  • B Kidneys
  • C Heart
  • D Liver
Permalink
Correct Answer: Option B — Kidneys
Explanation: The kidneys filter waste products and excess fluids from the blood, forming urine for excretion. Each kidney contains about a million nephrons, tiny filtering units essential for maintaining the body's fluid and electrolyte balance.
Submitted by: PaperMCQs
83
Easy css

Which part of the human body produces insulin?

  • A Kidney
  • B Spleen
  • C Liver
  • D Pancreas
Permalink
Correct Answer: Option D — Pancreas
Explanation: The pancreas produces insulin, a hormone that regulates blood sugar levels by allowing cells to absorb glucose. Insufficient insulin production leads to diabetes mellitus, a common chronic disease affecting glucose metabolism worldwide.
Submitted by: PaperMCQs
84
Easy fpsc

What is the normal body temperature of a healthy human in Fahrenheit?

  • A 100.4°F
  • B 98.6°F
  • C 97.0°F
  • D 96.4°F
Permalink
Correct Answer: Option B — 98.6°F
Explanation: The average normal human body temperature is 98.6°F (37°C). It can vary slightly by individual, time of day, and activity level. A temperature above 100.4°F is generally considered a fever requiring medical attention.
Submitted by: PaperMCQs
85
Easy fpsc ppsc nts

Which gas causes the fizzing and bubbling when a carbonated drink bottle is opened?

  • A Oxygen
  • B Nitrogen
  • C Methane
  • D Carbon dioxide
Permalink
Correct Answer: Option D — Carbon dioxide
Explanation: Carbon dioxide dissolved under pressure in carbonated drinks rapidly escapes as gas forming bubbles when the bottle is opened and pressure drops allowing the gas to come out of solution.
Submitted by: PaperMCQs
86
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
Permalink
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
87
Medium fpsc ppsc nts

Which device converts sound waves into electrical signals for recording or amplification?

  • A Microphone
  • B Loudspeaker
  • C Capacitor
  • D Battery
Permalink
Correct Answer: Option A — Microphone
Explanation: A microphone uses a diaphragm that vibrates with incoming sound waves and converts those mechanical vibrations into electrical signals through electromagnetic or capacitive transduction.
Submitted by: PaperMCQs
88
Easy ppsc nts

Which planet is known as the Blue Planet due to its large amount of surface water?

  • A Mars
  • B Earth
  • C Venus
  • D Saturn
Permalink
Correct Answer: Option B — Earth
Explanation: Earth is called the Blue Planet because approximately 71 percent of its surface is covered by water giving it a distinctive blue appearance when viewed from space.
Submitted by: PaperMCQs
89
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
Permalink
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
90
Medium fpsc ppsc nts

Which property of water causes it to expand when it freezes making ice less dense than liquid water?

  • A Hydrogen bonding creating a crystalline structure
  • B High specific heat capacity
  • C High surface tension
  • D High viscosity
Permalink
Correct Answer: Option A — Hydrogen bonding creating a crystalline structure
Explanation: Water expands when it freezes because hydrogen bonds arrange water molecules into a hexagonal crystalline lattice that takes up more space than the same number of liquid water molecules.
Submitted by: PaperMCQs
91
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
92
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
93
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
Permalink
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
94
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
Permalink
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
95
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
Permalink
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
96
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
97
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
Permalink
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
98
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
99
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
Permalink
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
100
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
Permalink
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
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