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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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41
Medium fpsc ppsc nts

Which household disinfectant chemical is commonly used to purify drinking water in small quantities?

  • A Chlorine
  • B Sulfuric acid
  • C Hydrochloric acid
  • D Ammonia
Permalink
Correct Answer: Option A — Chlorine
Explanation: Chlorine is commonly added in small safe quantities to drinking water supplies to kill bacteria viruses and other pathogens making the water safe for human consumption.
Submitted by: PaperMCQs
42
Medium fpsc ppsc nts

Which everyday device changes alternating current from power lines to the lower voltages suitable for homes?

  • A Transformer
  • B Generator
  • C Battery
  • D Inverter
Permalink
Correct Answer: Option A — Transformer
Explanation: Transformers step down the high voltage alternating current from power transmission lines to the lower voltages suitable for safe use in residential and commercial buildings.
Submitted by: PaperMCQs
43
Medium fpsc ppsc nts

Which unit measures the loudness or intensity of sound?

  • A Hertz
  • B Decibel
  • C Joule
  • D Newton
Permalink
Correct Answer: Option B — Decibel
Explanation: Decibel is the unit used to measure sound intensity or loudness with normal conversation at about 60 dB and sounds above 85 dB potentially damaging hearing over time.
Submitted by: PaperMCQs
44
Medium fpsc ppsc nts

Which unit measures the frequency of sound waves typically expressed as cycles per second?

  • A Decibel
  • B Joule
  • C Hertz
  • D Pascal
Permalink
Correct Answer: Option C — Hertz
Explanation: Hertz is the unit that measures the frequency of sound waves representing the number of cycles per second with human hearing ranging from about 20 Hz to 20000 Hz.
Submitted by: PaperMCQs
45
Medium fpsc ppsc nts

Which chemical element has the highest melting point of all pure metals, used in light bulb filaments?

  • A Iron
  • B Tungsten
  • C Platinum
  • D Titanium
Permalink
Correct Answer: Option B — Tungsten
Explanation: Tungsten has the highest melting point of all pure metals at about 3422 degrees Celsius making it ideal for light bulb filaments that must withstand intense heat without melting.
Submitted by: PaperMCQs
46
Medium fpsc ppsc nts

Which gas makes up approximately 0.04 percent of Earth's atmosphere and is essential for plant photosynthesis?

  • A Oxygen
  • B Carbon dioxide
  • C Nitrogen
  • D Argon
Permalink
Correct Answer: Option B — Carbon dioxide
Explanation: Carbon dioxide makes up about 0.04 percent of Earth's atmosphere and despite its small concentration it is essential for photosynthesis and plays a major role in climate regulation.
Submitted by: PaperMCQs
47
Medium css fpsc ppsc

Which scale measures the hardness of minerals, with diamond being the hardest at 10?

  • A Richter scale
  • B Mohs scale
  • C Beaufort scale
  • D Kelvin scale
Permalink
Correct Answer: Option B — Mohs scale
Explanation: The Mohs hardness scale ranks minerals from 1 to 10 based on their ability to scratch each other with diamond rated at 10 as the hardest naturally occurring mineral.
Submitted by: PaperMCQs
48
Medium fpsc ppsc nts

Which common household item works based on the principle of Pascal's law?

  • A Knife
  • B Thermometer
  • C Hydraulic jack
  • D Barometer
Permalink
Correct Answer: Option C — Hydraulic jack
Explanation: A hydraulic jack uses Pascal's law where pressure applied to a confined fluid is transmitted equally in all directions allowing a small force to lift heavy loads.
Submitted by: PaperMCQs
49
Medium fpsc ppsc nts

Which gas is released when metals like zinc react with dilute hydrochloric acid?

  • A Oxygen
  • B Carbon dioxide
  • C Hydrogen
  • D Nitrogen
Permalink
Correct Answer: Option C — Hydrogen
Explanation: When zinc reacts with dilute hydrochloric acid hydrogen gas is produced along with zinc chloride and this reaction is a standard laboratory method to generate hydrogen.
Submitted by: PaperMCQs
50
Medium fpsc ppsc nts

Which process allows a submarine to sink or rise by adjusting water in ballast tanks?

  • A Changing buoyancy through water displacement
  • B Evaporation
  • C Osmosis
  • D Thermal expansion
Permalink
Correct Answer: Option A — Changing buoyancy through water displacement
Explanation: Submarines control their depth by filling or emptying ballast tanks with water to change their overall density relative to the surrounding water adjusting buoyancy.
Submitted by: PaperMCQs
51
Medium fpsc ppsc nts

Which common ailment is caused by the Helicobacter pylori bacterium?

  • A Common cold
  • B Stomach ulcers
  • C Malaria
  • D Chickenpox
Permalink
Correct Answer: Option B — Stomach ulcers
Explanation: Helicobacter pylori is a bacterium that infects the stomach lining causing inflammation that can lead to peptic ulcers and is treatable with antibiotics.
Submitted by: PaperMCQs
52
Medium fpsc ppsc nts

Which phenomenon explains why a straw placed in a drink allows liquid to be sucked upward?

  • A Gravity pulling liquid
  • B Magnetic force
  • C Atmospheric pressure pushing liquid up
  • D Surface tension alone
Permalink
Correct Answer: Option C — Atmospheric pressure pushing liquid up
Explanation: When you suck on a straw you reduce air pressure inside it and the greater atmospheric pressure outside pushes the liquid upward into your mouth.
Submitted by: PaperMCQs
53
Medium fpsc ppsc nts

Which gas is used to fill incandescent light bulb to prevent the filament from burning?

  • A Oxygen
  • B Carbon dioxide
  • C Argon or nitrogen
  • D Helium
Permalink
Correct Answer: Option C — Argon or nitrogen
Explanation: Incandescent bulbs are filled with argon or nitrogen to prevent the tungsten filament from oxidising and burning out quickly extending the bulb's lifespan.
Submitted by: PaperMCQs
54
Medium fpsc ppsc nts

Which phenomenon causes a needle to deflect when placed near a current-carrying wire?

  • A Magnetism
  • B Gravity
  • C Static electricity
  • D Sound waves
Permalink
Correct Answer: Option A — Magnetism
Explanation: A current-carrying wire produces a magnetic field around it which deflects a nearby compass needle demonstrating the link between electricity and magnetism.
Submitted by: PaperMCQs
55
Medium fpsc ppsc nts

Which everyday material is used as an X-ray absorber to protect the body during medical scans?

  • A Copper
  • B Lead
  • C Aluminium
  • D Steel
Permalink
Correct Answer: Option B — Lead
Explanation: Lead is used as a shield during X-ray procedures because it effectively absorbs harmful ionising radiation protecting body parts not being examined.
Submitted by: PaperMCQs
56
Medium fpsc ppsc nts

Which everyday process converts mechanical energy into electrical energy in a bicycle dynamo?

  • A Radiation
  • B Conduction
  • C Electromagnetic induction
  • D Chemical reaction
Permalink
Correct Answer: Option C — Electromagnetic induction
Explanation: A bicycle dynamo converts mechanical energy from wheel rotation into electrical energy through electromagnetic induction as a coil rotates within a magnetic field.
Submitted by: PaperMCQs
57
Medium fpsc ppsc nts

Which organ produces the hormone adrenaline that prepares the body for fight or flight response?

  • A Thyroid gland
  • B Pituitary gland
  • C Pancreas
  • D Adrenal gland
Permalink
Correct Answer: Option D — Adrenal gland
Explanation: The adrenal glands located above the kidneys produce adrenaline which triggers the fight or flight response by increasing heart rate and blood flow to muscles.
Submitted by: PaperMCQs
58
Medium fpsc ppsc nts

Which everyday safety device detects dangerous levels of carbon monoxide in homes?

  • A Smoke detector
  • B Carbon monoxide detector
  • C Thermostat
  • D Hygrometer
Permalink
Correct Answer: Option B — Carbon monoxide detector
Explanation: Carbon monoxide detectors are specialized safety devices that detect dangerous levels of this odorless gas in homes alerting occupants before harmful exposure occurs.
Submitted by: PaperMCQs
59
Medium fpsc ppsc nts

Which colorless and odorless gas is particularly dangerous because it can cause poisoning without detection unless monitored?

  • A Natural gas
  • B Carbon monoxide
  • C Helium
  • D Nitrogen
Permalink
Correct Answer: Option B — Carbon monoxide
Explanation: Carbon monoxide is a colorless and odorless gas produced by incomplete combustion making it particularly dangerous since it can cause poisoning without detection unless monitored by alarms.
Submitted by: PaperMCQs
60
Medium fpsc ppsc nts

Which common gas leak hazard in homes is often detected by its distinctive rotten egg smell added intentionally for safety?

  • A Natural gas leaks
  • B Carbon monoxide leaks
  • C Oxygen leaks
  • D Nitrogen leaks
Permalink
Correct Answer: Option A — Natural gas leaks
Explanation: Natural gas is odorless in its pure form so a chemical called mercaptan is intentionally added to give it a rotten egg smell allowing people to detect leaks for safety.
Submitted by: PaperMCQs
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