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Everyday Science MCQs

179 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
Medium ppsc

Which planet has the shortest day in the solar system?

  • A Saturn
  • B Jupiter
  • C Mars
  • D Venus
Permalink
Correct Answer: Option B — Jupiter
Explanation: Jupiter has the shortest day of any planet in the solar system, completing one rotation on its axis in just under 10 hours. Despite being the largest planet, its rapid spin causes a noticeable flattening at its poles.
Submitted by: PaperMCQs
2
Medium ppsc

What is the main function of the human skeleton?

  • A Digestion
  • B Support and protection
  • C Respiration
  • D Circulation
Permalink
Correct Answer: Option B — Support and protection
Explanation: The human skeleton provides structural support for the body, protects vital organs like the brain and heart, and serves as an attachment point for muscles enabling movement. It also stores minerals and produces blood cells in bone marrow.
Submitted by: PaperMCQs
3
Medium ppsc

Which vitamin is synthesized by bacteria in the human intestine?

  • A Vitamin A
  • B Vitamin D
  • C Vitamin K
  • D Vitamin C
Permalink
Correct Answer: Option C — Vitamin K
Explanation: Gut bacteria in the human intestine synthesize Vitamin K, which is essential for proper blood clotting. This is one reason antibiotics, which can disrupt gut flora, may sometimes affect a person's clotting ability.
Submitted by: PaperMCQs
4
Medium ppsc

Which part of the digestive system absorbs most nutrients?

  • A Small intestine
  • B Stomach
  • C Large intestine
  • D Esophagus
Permalink
Correct Answer: Option A — Small intestine
Explanation: The small intestine is responsible for absorbing most nutrients from digested food, aided by finger-like projections called villi that increase surface area. Its length, roughly 6 meters, allows thorough nutrient absorption before waste passes to the large intestine.
Submitted by: PaperMCQs
5
Medium ppsc

What is the smallest unit of life?

  • A Organ
  • B Cell
  • C Atom
  • D Tissue
Permalink
Correct Answer: Option B — Cell
Explanation: The cell is the basic structural and functional unit of all living organisms, capable of carrying out life processes independently. Cells can be prokaryotic, like bacteria, or eukaryotic, like those found in plants and animals.
Submitted by: PaperMCQs
6
Medium ppsc

What is the hardest natural substance found on Earth?

  • A Diamond
  • B Quartz
  • C Granite
  • D Iron
Permalink
Correct Answer: Option A — Diamond
Explanation: Diamond is the hardest known natural material, composed of carbon atoms arranged in a crystal lattice structure. Its hardness is measured as 10 on the Mohs scale, making it valuable for both jewelry and industrial cutting tools.
Submitted by: PaperMCQs
7
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
8
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
9
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
10
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
11
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
12
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
13
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
14
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
15
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
Permalink
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
16
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
17
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
18
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
Permalink
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
19
Medium css fpsc ppsc

Which type of diet is most commonly recommended for preventing cardiovascular disease due to its emphasis on healthy fats?

  • A High fat diet
  • B Carnivore diet
  • C High sugar diet
  • D Mediterranean diet
Permalink
Correct Answer: Option D — Mediterranean diet
Explanation: The Mediterranean diet emphasising fruits vegetables whole grains legumes and healthy fats from olive oil and fish is widely recommended for reducing cardiovascular disease risk.
Submitted by: PaperMCQs
20
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
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