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Everyday Science MCQs

303 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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121
Medium fpsc ppsc nts

Which microorganism is primarily responsible for fermenting milk into yogurt?

  • A Yeast
  • B Lactic acid bacteria
  • C Mold
  • D Virus
Permalink
Correct Answer: Option B — Lactic acid bacteria
Explanation: Lactic acid bacteria ferment lactose in milk into lactic acid which thickens the milk and gives yogurt its characteristic tangy flavor and creamy texture.
Submitted by: PaperMCQs
122
Easy fpsc ppsc nts

Which gas produced during fermentation causes dough to rise when making bread?

  • A Oxygen
  • B Carbon dioxide
  • C Nitrogen
  • D Hydrogen
Permalink
Correct Answer: Option B — Carbon dioxide
Explanation: Carbon dioxide gas produced by yeast during fermentation causes bread dough to rise creating the light airy texture characteristic of well baked bread products.
Submitted by: PaperMCQs
123
Medium fpsc ppsc nts

Which everyday material is commonly used as a natural disinfectant due to its antimicrobial properties?

  • A Sugar
  • B Honey
  • C Salt water alone
  • D Cooking oil
Permalink
Correct Answer: Option B — Honey
Explanation: Honey has natural antimicrobial properties due to its low moisture content and acidic pH making it effective as a natural disinfectant and wound healing aid in traditional medicine.
Submitted by: PaperMCQs
124
Medium fpsc ppsc nts

Which everyday process explains why water boils at a lower temperature at high altitudes such as on mountains?

  • A Lower atmospheric pressure
  • B Higher atmospheric pressure
  • C Increased oxygen levels
  • D Reduced gravity
Permalink
Correct Answer: Option A — Lower atmospheric pressure
Explanation: At high altitudes atmospheric pressure is lower which reduces the boiling point of water meaning it boils at a temperature below 100 degrees Celsius found at sea level.
Submitted by: PaperMCQs
125
Medium fpsc ppsc nts

Which everyday process explains why food cooks faster in a pressure cooker compared to an open pot?

  • A Lower boiling point at high pressure
  • B Higher boiling point at high pressure
  • C Reduced heat transfer
  • D Increased oxygen levels
Permalink
Correct Answer: Option B — Higher boiling point at high pressure
Explanation: A pressure cooker raises internal pressure which increases the boiling point of water allowing food to cook faster at higher temperatures than would be possible in an open pot.
Submitted by: PaperMCQs
126
Medium fpsc ppsc nts

Which optical phenomenon creates the illusion of water on a hot road surface during sunny days?

  • A Rainbow
  • B Mirage
  • C Aurora
  • D Halo
Permalink
Correct Answer: Option B — Mirage
Explanation: A mirage is an optical phenomenon caused by the bending of light through layers of air with varying temperatures creating the illusion of water on hot road surfaces during sunny days.
Submitted by: PaperMCQs
127
Hard fpsc ppsc nts

Which natural phenomenon produces colorful displays of light in polar regions due to solar particles interacting with the atmosphere?

  • A Rainbow
  • B Aurora
  • C Halo
  • D Mirage
Permalink
Correct Answer: Option B — Aurora
Explanation: Auroras occur when charged particles from the sun interact with gases in Earth's upper atmosphere near the poles producing colorful displays of light known as the northern or southern lights.
Submitted by: PaperMCQs
128
Medium fpsc ppsc nts

Which natural phenomenon explains why a compass needle always points toward magnetic north?

  • A Earth's magnetic field
  • B Earth's gravitational field
  • C Earth's rotation
  • D Solar wind
Permalink
Correct Answer: Option A — Earth's magnetic field
Explanation: Earth's magnetic field generated by molten iron movement in its core causes a compass needle to align itself and point toward magnetic north providing a reliable navigation tool.
Submitted by: PaperMCQs
129
Medium fpsc ppsc nts

Which everyday device converts alternating current into direct current for charging electronic devices?

  • A Inverter
  • B Rectifier
  • C Transformer
  • D Generator
Permalink
Correct Answer: Option B — Rectifier
Explanation: A rectifier converts alternating current into direct current and is commonly found inside chargers for electronic devices that require stable DC power for proper operation.
Submitted by: PaperMCQs
130
Medium fpsc ppsc nts

Which everyday device converts direct current into alternating current for household appliance use?

  • A Transformer
  • B Inverter
  • C Generator
  • D Rectifier
Permalink
Correct Answer: Option B — Inverter
Explanation: An inverter converts direct current typically from batteries or solar panels into alternating current allowing household appliances designed for AC power to operate properly.
Submitted by: PaperMCQs
131
Medium fpsc ppsc nts

Which everyday device changes the voltage level of alternating current for transmission or use?

  • A Generator
  • B Transformer
  • C Battery
  • D Inverter
Permalink
Correct Answer: Option B — Transformer
Explanation: A transformer changes the voltage level of alternating current using electromagnetic induction between coils enabling efficient electricity transmission over long distances and safe household use.
Submitted by: PaperMCQs
132
Medium fpsc ppsc nts

Which everyday device uses electromagnetic induction to convert mechanical energy into electrical energy?

  • A Battery
  • B Electric generator
  • C Solar panel
  • D Transformer
Permalink
Correct Answer: Option B — Electric generator
Explanation: An electric generator uses electromagnetic induction by rotating a coil within a magnetic field to convert mechanical energy into electrical energy for widespread power generation.
Submitted by: PaperMCQs
133
Hard fpsc ppsc nts

Which scientific law explains how a changing magnetic field can induce an electric current in a conductor?

  • A Ohm's law
  • B Faraday's law of electromagnetic induction
  • C Newton's law
  • D Coulomb's law
Permalink
Correct Answer: Option B — Faraday's law of electromagnetic induction
Explanation: Faraday's law of electromagnetic induction explains how a changing magnetic field through a conductor can induce an electric current forming the basis for generators and transformers.
Submitted by: PaperMCQs
134
Medium fpsc ppsc nts

Which law in physics relates voltage current and resistance in an electrical circuit?

  • A Ohm's law
  • B Newton's law
  • C Boyle's law
  • D Faraday's law
Permalink
Correct Answer: Option A — Ohm's law
Explanation: Ohm's law states that the current flowing through a conductor is directly proportional to the voltage applied and inversely proportional to its resistance forming a foundational principle in electrical circuits.
Submitted by: PaperMCQs
135
Medium fpsc ppsc nts

Which everyday device measures the voltage or potential difference between two points in a circuit?

  • A Ammeter
  • B Voltmeter
  • C Ohmmeter
  • D Galvanometer
Permalink
Correct Answer: Option B — Voltmeter
Explanation: A voltmeter measures the voltage or potential difference between two points in a circuit and is connected in parallel to accurately record the electrical potential without disrupting current flow.
Submitted by: PaperMCQs
136
Medium fpsc ppsc nts

Which everyday device measures electrical current flowing through a circuit?

  • A Voltmeter
  • B Ammeter
  • C Ohmmeter
  • D Wattmeter
Permalink
Correct Answer: Option B — Ammeter
Explanation: An ammeter measures the electrical current flowing through a circuit and is connected in series within the circuit to accurately record the amount of current passing through.
Submitted by: PaperMCQs
137
Medium fpsc ppsc nts

Which scientific law explains that every object attracts every other object with a force proportional to their masses?

  • A Newton's law of universal gravitation
  • B Coulomb's law
  • C Boyle's law
  • D Ohm's law
Permalink
Correct Answer: Option A — Newton's law of universal gravitation
Explanation: Newton's law of universal gravitation explains that every object in the universe attracts every other object with a force proportional to their masses and inversely proportional to the square of the distance between them.
Submitted by: PaperMCQs
138
Medium fpsc ppsc nts

Which force is primarily responsible for keeping planets in orbit around the sun?

  • A Magnetic force
  • B Gravitational force
  • C Electrostatic force
  • D Nuclear force
Permalink
Correct Answer: Option B — Gravitational force
Explanation: Gravitational force between the sun and planets keeps them in stable orbits by continuously pulling them toward the sun while their forward momentum prevents them from falling in.
Submitted by: PaperMCQs
139
Easy fpsc ppsc nts

Which natural satellite is the only one orbiting Earth and significantly influences ocean tides?

  • A Mars
  • B The Moon
  • C Phobos
  • D Titan
Permalink
Correct Answer: Option B — The Moon
Explanation: The Moon is Earth's only natural satellite and its gravitational pull significantly influences ocean tides creating the regular rise and fall of sea levels observed worldwide.
Submitted by: PaperMCQs
140
Easy fpsc ppsc nts

Which planet is the closest to the sun in our solar system?

  • A Venus
  • B Mercury
  • C Earth
  • D Mars
Permalink
Correct Answer: Option B — Mercury
Explanation: Mercury is the closest planet to the sun in our solar system and experiences extreme temperature variations due to its proximity and lack of a substantial atmosphere.
Submitted by: PaperMCQs
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