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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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Subject Test

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101
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
102
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
103
Easy fpsc ppsc nts

Which storage practice helps slow down the ripening and spoilage process of most fruits and vegetables?

  • A Storing at room temperature
  • B Refrigeration
  • C Storing in direct sunlight
  • D Storing in plastic without ventilation
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Correct Answer: Option B — Refrigeration
Explanation: Refrigeration slows down the ripening and spoilage process of most fruits and vegetables by reducing the rate of enzymatic and microbial activity that causes decay.
Submitted by: PaperMCQs
104
Easy fpsc ppsc nts

Which common food safety practice prevents cross contamination between raw meat and other foods?

  • A Using the same cutting board for everything
  • B Using separate cutting boards for raw meat
  • C Washing hands only after cooking
  • D Storing meat at room temperature
Permalink
Correct Answer: Option B — Using separate cutting boards for raw meat
Explanation: Using separate cutting boards for raw meat and other foods prevents cross contamination by avoiding the transfer of harmful bacteria from raw meat to ready to eat items.
Submitted by: PaperMCQs
105
Easy fpsc ppsc nts

Which everyday hygiene practice is most effective in preventing the spread of common cold and flu viruses?

  • A Washing hands frequently
  • B Eating spicy food
  • C Drinking cold water
  • D Wearing sunglasses
Permalink
Correct Answer: Option A — Washing hands frequently
Explanation: Washing hands frequently with soap and water removes viruses and bacteria from the skin significantly reducing the risk of spreading common cold and flu infections to others.
Submitted by: PaperMCQs
106
Easy fpsc ppsc nts

Which type of microorganism is responsible for causing common food spoilage through mold growth?

  • A Bacteria
  • B Fungi
  • C Virus
  • D Protozoa
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Correct Answer: Option B — Fungi
Explanation: Fungi including various molds are responsible for common food spoilage by breaking down organic material and producing visible fuzzy growth on items like bread and fruit.
Submitted by: PaperMCQs
107
Medium fpsc ppsc nts

Which microorganism is primarily responsible for fermenting sugars into alcohol in brewing and winemaking?

  • A Bacteria
  • B Yeast
  • C Algae
  • D Protozoa
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Correct Answer: Option B — Yeast
Explanation: Yeast ferments sugars into alcohol and carbon dioxide through anaerobic respiration making it essential for brewing beer producing wine and baking bread.
Submitted by: PaperMCQs
108
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
109
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
110
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
111
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
112
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
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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
113
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
114
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
115
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
116
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
117
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
118
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
119
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
120
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
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