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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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181
Medium fpsc ppsc nts

Which muscle separates the chest cavity from the abdominal cavity and assists in breathing?

  • A Diaphragm
  • B Intercostal muscles
  • C Trapezius
  • D Bicep
Permalink
Correct Answer: Option A — Diaphragm
Explanation: The diaphragm is a dome shaped muscle that separates the chest cavity from the abdominal cavity and contracts and relaxes to facilitate inhalation and exhalation.
Submitted by: PaperMCQs
182
Medium fpsc ppsc nts

Which flap of tissue prevents food from entering the trachea during swallowing?

  • A Larynx
  • B Epiglottis
  • C Pharynx
  • D Esophagus
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Correct Answer: Option B — Epiglottis
Explanation: The epiglottis is a flap of tissue that folds over the trachea during swallowing preventing food and liquids from entering the airway and causing choking.
Submitted by: PaperMCQs
183
Medium fpsc ppsc nts

Which structure in the throat is commonly known as the voice box and is responsible for sound production?

  • A Pharynx
  • B Larynx
  • C Trachea
  • D Epiglottis
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Correct Answer: Option B — Larynx
Explanation: The larynx commonly known as the voice box contains vocal cords that vibrate to produce sound and also helps protect the airway during swallowing.
Submitted by: PaperMCQs
184
Medium fpsc ppsc nts

Which structure connects the throat to the lungs and branches into smaller airways within the chest?

  • A Esophagus
  • B Trachea
  • C Larynx
  • D Pharynx
Permalink
Correct Answer: Option B — Trachea
Explanation: The trachea commonly known as the windpipe connects the throat to the lungs branching into smaller airways called bronchi that direct air into each lung.
Submitted by: PaperMCQs
185
Medium fpsc ppsc nts

Which part of the human respiratory system is primarily responsible for warming and filtering incoming air?

  • A Trachea
  • B Nasal cavity
  • C Bronchi
  • D Alveoli
Permalink
Correct Answer: Option B — Nasal cavity
Explanation: The nasal cavity warms moistens and filters incoming air removing dust and pathogens before it travels further into the respiratory system for gas exchange.
Submitted by: PaperMCQs
186
Medium fpsc ppsc nts

Which organ in the human body acts as a reservoir for blood and helps filter out old or damaged red blood cells?

  • A Liver
  • B Spleen
  • C Pancreas
  • D Kidney
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Correct Answer: Option B — Spleen
Explanation: The spleen acts as a reservoir for blood and filters out old or damaged red blood cells while also playing a role in immune system function within the body.
Submitted by: PaperMCQs
187
Easy fpsc ppsc nts

Which organ produces insulin to regulate blood sugar levels in the body?

  • A Liver
  • B Pancreas
  • C Kidney
  • D Spleen
Permalink
Correct Answer: Option B — Pancreas
Explanation: The pancreas produces insulin a hormone that regulates blood sugar levels by allowing cells to absorb glucose from the bloodstream for energy or storage.
Submitted by: PaperMCQs
188
Medium fpsc ppsc nts

Which organ stores bile produced by the liver until it is needed for digestion?

  • A Pancreas
  • B Gallbladder
  • C Stomach
  • D Spleen
Permalink
Correct Answer: Option B — Gallbladder
Explanation: The gallbladder stores and concentrates bile produced by the liver releasing it into the small intestine when needed to help digest fatty foods consumed during meals.
Submitted by: PaperMCQs
189
Medium fpsc ppsc nts

Which organ produces bile that aids in the digestion of fats?

  • A Pancreas
  • B Liver
  • C Gallbladder
  • D Stomach
Permalink
Correct Answer: Option B — Liver
Explanation: The liver produces bile which is stored in the gallbladder and released into the small intestine to emulsify fats making them easier to digest and absorb.
Submitted by: PaperMCQs
190
Easy fpsc ppsc nts

Which acid in the stomach helps in the digestion of food and kills harmful bacteria?

  • A Sulfuric acid
  • B Hydrochloric acid
  • C Acetic acid
  • D Citric acid
Permalink
Correct Answer: Option B — Hydrochloric acid
Explanation: Hydrochloric acid secreted by stomach glands helps digest food by activating pepsin and also kills many harmful bacteria that may be present in ingested food.
Submitted by: PaperMCQs
191
Medium fpsc ppsc nts

Which stomach enzyme is primarily responsible for breaking down proteins into smaller peptides?

  • A Amylase
  • B Lipase
  • C Pepsin
  • D Trypsin
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Correct Answer: Option C — Pepsin
Explanation: Pepsin is a stomach enzyme that breaks down proteins into smaller peptides functioning optimally in the highly acidic environment created by hydrochloric acid in the stomach.
Submitted by: PaperMCQs
192
Medium fpsc ppsc nts

Which enzyme present in saliva begins the digestion of starch in the mouth?

  • A Pepsin
  • B Amylase
  • C Lipase
  • D Trypsin
Permalink
Correct Answer: Option B — Amylase
Explanation: Amylase present in saliva begins breaking down starch into simpler sugars during the initial stage of digestion before food even reaches the stomach.
Submitted by: PaperMCQs
193
Easy fpsc ppsc nts

Which gland produces saliva to aid in the initial digestion of food in the mouth?

  • A Pituitary gland
  • B Salivary gland
  • C Thyroid gland
  • D Adrenal gland
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Correct Answer: Option B — Salivary gland
Explanation: Salivary glands produce saliva containing enzymes like amylase that begin breaking down starches in food while also moistening it to ease swallowing and digestion.
Submitted by: PaperMCQs
194
Easy fpsc ppsc nts

Which type of teeth are primarily used for grinding and chewing food at the back of the mouth?

  • A Incisors
  • B Canines
  • C Molars
  • D Premolars
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Correct Answer: Option C — Molars
Explanation: Molars located at the back of the mouth are primarily used for grinding and chewing food into smaller pieces before swallowing aiding in efficient digestion.
Submitted by: PaperMCQs
195
Easy fpsc ppsc nts

Which type of teeth are primarily used for tearing food in humans?

  • A Incisors
  • B Canines
  • C Molars
  • D Premolars
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Correct Answer: Option B — Canines
Explanation: Canines are pointed teeth primarily used for tearing food while incisors cut and molars grind providing humans with a complete set of teeth for varied chewing functions.
Submitted by: PaperMCQs
196
Medium fpsc ppsc nts

Which tube connects the middle ear to the throat helping equalize air pressure?

  • A Cochlea
  • B Eustachian tube
  • C Auditory canal
  • D Semicircular canal
Permalink
Correct Answer: Option B — Eustachian tube
Explanation: The Eustachian tube connects the middle ear to the throat helping equalize air pressure on both sides of the eardrum which is why ears may pop during altitude changes.
Submitted by: PaperMCQs
197
Medium fpsc ppsc nts

Which part of the human ear converts sound vibrations into electrical signals for the brain?

  • A Eardrum
  • B Cochlea
  • C Outer ear
  • D Eustachian tube
Permalink
Correct Answer: Option B — Cochlea
Explanation: The cochlea located in the inner ear converts sound vibrations into electrical nerve signals which are then transmitted to the brain via the auditory nerve for interpretation.
Submitted by: PaperMCQs
198
Medium fpsc ppsc nts

Which part of the human ear is primarily responsible for maintaining balance?

  • A Cochlea
  • B Semicircular canals
  • C Eardrum
  • D Auditory nerve
Permalink
Correct Answer: Option B — Semicircular canals
Explanation: The semicircular canals located in the inner ear detect rotational movements of the head and play a primary role in maintaining body balance and spatial orientation.
Submitted by: PaperMCQs
199
Medium fpsc ppsc nts

Which gas is most responsible for causing acid rain when it reacts with atmospheric moisture?

  • A Carbon dioxide
  • B Sulfur dioxide
  • C Nitrogen
  • D Helium
Permalink
Correct Answer: Option B — Sulfur dioxide
Explanation: Sulfur dioxide released from burning fossil fuels reacts with water vapor in the atmosphere forming sulfuric acid which falls as acid rain damaging soil water bodies and structures.
Submitted by: PaperMCQs
200
Easy fpsc ppsc nts

Which everyday safety practice helps protect skin from harmful ultraviolet radiation during sun exposure?

  • A Wearing dark clothing only
  • B Applying sunscreen
  • C Drinking more water
  • D Avoiding all outdoor activity
Permalink
Correct Answer: Option B — Applying sunscreen
Explanation: Applying sunscreen helps protect skin from harmful ultraviolet radiation by absorbing or reflecting UV rays reducing the risk of sunburn and long term skin damage from sun exposure.
Submitted by: PaperMCQs
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