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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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81
Medium css fpsc ppsc

Which type of chemical bond involves the sharing of electrons between atoms?

  • A Ionic bond
  • B Metallic bond
  • C Covalent bond
  • D Hydrogen bond
Permalink
Correct Answer: Option C — Covalent bond
Explanation: A covalent bond forms when atoms share electrons between them to achieve stable electron configurations commonly seen in molecules like water and carbon dioxide.
Submitted by: PaperMCQs
82
Medium ppsc nts

Which everyday phenomenon explains how a guitar produces different musical notes when different strings are plucked?

  • A All strings vibrate at the same frequency
  • B Longer strings produce higher pitch
  • C Strings of different mass and tension vibrate at different frequencies
  • D Thicker strings always produce higher notes
Permalink
Correct Answer: Option C — Strings of different mass and tension vibrate at different frequencies
Explanation: Guitar strings of different thickness and tension vibrate at different natural frequencies when plucked producing different musical pitches from deep bass to high treble notes.
Submitted by: PaperMCQs
83
Medium fpsc ppsc nts

Which part of the human body regulates temperature through sweating and blood vessel dilation?

  • A Liver
  • B Lungs
  • C Skin
  • D Kidney
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Correct Answer: Option C — Skin
Explanation: The skin regulates body temperature through sweating to cool down and constricting or dilating blood vessels to retain or release heat maintaining thermal homeostasis.
Submitted by: PaperMCQs
84
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
85
Easy fpsc ppsc nts

Which phenomenon is responsible for the formation of a shadow?

  • A Refraction
  • B Rectilinear propagation of light
  • C Absorption
  • D Dispersion
Permalink
Correct Answer: Option B — Rectilinear propagation of light
Explanation: Shadows form because light travels in straight lines and when an opaque object blocks the light path a region of darkness called a shadow forms behind the object.
Submitted by: PaperMCQs
86
Easy fpsc ppsc nts

What is the approximate speed of light in a vacuum?

  • A 300 km per second
  • B 3000 km per second
  • C 300000 km per second
  • D 3000000 km per second
Permalink
Correct Answer: Option C — 300000 km per second
Explanation: Light travels at approximately 300000 kilometres per second in a vacuum making it the fastest known phenomenon in the universe and a fundamental constant in physics.
Submitted by: PaperMCQs
87
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
88
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
89
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
90
Easy fpsc ppsc nts

Which human body system is primarily responsible for fighting infections and diseases?

  • A Digestive system
  • B Immune system
  • C Skeletal system
  • D Excretory system
Permalink
Correct Answer: Option B — Immune system
Explanation: The immune system is the body's primary defense against infections and diseases using white blood cells antibodies and lymph nodes to detect and destroy pathogens.
Submitted by: PaperMCQs
91
Easy ppsc nts

Which common kitchen equipment uses microwave radiation to heat food by exciting water molecules?

  • A Conventional oven
  • B Microwave oven
  • C Induction cooker
  • D Pressure cooker
Permalink
Correct Answer: Option B — Microwave oven
Explanation: A microwave oven uses microwave radiation to excite water molecules within food generating heat from within rather than from an external heat source enabling faster cooking.
Submitted by: PaperMCQs
92
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
93
Hard css fpsc ppsc

Which part of the nervous system is called the automatic system and controls involuntary body functions like digestion?

  • A Somatic nervous system
  • B Central nervous system
  • C Autonomic nervous system
  • D Peripheral nervous system
Permalink
Correct Answer: Option C — Autonomic nervous system
Explanation: The autonomic nervous system regulates involuntary functions like digestion heartbeat and breathing without conscious effort and is divided into sympathetic and parasympathetic divisions.
Submitted by: PaperMCQs
94
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
95
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
96
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
97
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
98
Easy fpsc ppsc nts

Which everyday observation shows that hot air rises and cool air sinks creating circulation?

  • A Boiling water forming convection currents
  • B Ice melting in sunlight
  • C Metal expanding when heated
  • D Sound echoing in a hall
Permalink
Correct Answer: Option A — Boiling water forming convection currents
Explanation: Boiling water shows convection currents as hot less-dense water rises to the surface while cooler denser water sinks demonstrating natural thermal circulation.
Submitted by: PaperMCQs
99
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
100
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
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