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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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1
Hard nts

What causes the phases of the moon?

  • A Moon's rotation alone
  • B Moon's position relative to Earth and Sun
  • C Earth's shadow
  • D Solar eclipses
Permalink
Correct Answer: Option B — Moon's position relative to Earth and Sun
Explanation: The phases of the moon result from changing angles between the Earth, moon, and sun, which affect how much of the moon's sunlit side is visible from Earth. This cycle repeats approximately every 29.5 days.
Submitted by: PaperMCQs
2
Medium nts

Which gas do humans exhale during respiration?

  • A Hydrogen
  • B Oxygen
  • C Carbon dioxide
  • D Nitrogen
Permalink
Correct Answer: Option C — Carbon dioxide
Explanation: During respiration, humans exhale carbon dioxide, a waste product generated when cells break down glucose to produce energy. This exchange of oxygen intake and carbon dioxide release occurs continuously in the lungs' alveoli.
Submitted by: PaperMCQs
3
Hard nts

Which vitamin deficiency leads to beriberi?

  • A Vitamin B9
  • B Vitamin B1 (Thiamine)
  • C Vitamin B6
  • D Vitamin B2
Permalink
Correct Answer: Option B — Vitamin B1 (Thiamine)
Explanation: Beriberi is caused by a deficiency of Vitamin B1, or thiamine, which is essential for converting carbohydrates into energy. It affects the nervous and cardiovascular systems and was historically common among populations relying heavily on polished rice.
Submitted by: PaperMCQs
4
Easy nts

What is the term for organisms that make their own food using sunlight?

  • A Parasites
  • B Decomposers
  • C Heterotrophs
  • D Autotrophs
Permalink
Correct Answer: Option D — Autotrophs
Explanation: Autotrophs, such as plants and algae, produce their own food through photosynthesis, converting sunlight, water, and carbon dioxide into glucose. They form the base of most food chains, supporting nearly all other life forms.
Submitted by: PaperMCQs
5
Medium nts

Which part of a plant cell is responsible for photosynthesis?

  • A Nucleus
  • B Vacuole
  • C Mitochondria
  • D Chloroplast
Permalink
Correct Answer: Option D — Chloroplast
Explanation: Chloroplasts contain chlorophyll, the green pigment that captures light energy for photosynthesis, converting carbon dioxide and water into glucose and oxygen. They are found in plant cells and some algae but not in animal cells.
Submitted by: PaperMCQs
6
Medium nts

What is the primary source of energy for Earth's climate system?

  • A Wind
  • B The Sun
  • C Earth's core
  • D Ocean currents
Permalink
Correct Answer: Option B — The Sun
Explanation: The Sun is the primary source of energy driving Earth's climate system, providing the heat and light that fuel weather patterns, ocean currents, and the water cycle. Variations in solar radiation influence long-term climate trends.
Submitted by: PaperMCQs
7
Easy nts

Which bird is known for its ability to mimic human speech?

  • A Eagle
  • B Sparrow
  • C Parrot
  • D Crow
Permalink
Correct Answer: Option C — Parrot
Explanation: Parrots are well known for their ability to mimic human speech and other sounds due to their highly developed vocal learning abilities. Species like the African Grey Parrot are particularly noted for their vocabulary and cognitive skills.
Submitted by: PaperMCQs
8
Medium nts

What is the chemical formula for table salt?

  • A CaCl2
  • B KCl
  • C NaCl
  • D MgCl2
Permalink
Correct Answer: Option C — NaCl
Explanation: Table salt's chemical formula is NaCl, composed of sodium and chlorine ions bonded together in a crystal lattice. It is essential for maintaining fluid balance and nerve function in the human body when consumed in moderation.
Submitted by: PaperMCQs
9
Hard nts

Which acid is found in the human stomach?

  • A Acetic acid
  • B Hydrochloric acid
  • C Citric acid
  • D Sulfuric acid
Permalink
Correct Answer: Option B — Hydrochloric acid
Explanation: The stomach produces hydrochloric acid to break down food and kill harmful bacteria ingested with meals. It also activates digestive enzymes like pepsin, which begin the breakdown of proteins into smaller peptide chains.
Submitted by: PaperMCQs
10
Medium nts

Which part of the plant conducts photosynthesis?

  • A Flowers
  • B Stem
  • C Leaves
  • D Roots
Permalink
Correct Answer: Option C — Leaves
Explanation: Leaves contain chlorophyll-filled chloroplasts that capture sunlight to convert carbon dioxide and water into glucose and oxygen. Their broad, flat shape maximizes surface area for absorbing sunlight during photosynthesis.
Submitted by: PaperMCQs
11
Medium nts

What is the term for animals that are active at night?

  • A Crepuscular
  • B Diurnal
  • C Hibernating
  • D Nocturnal
Permalink
Correct Answer: Option D — Nocturnal
Explanation: Nocturnal animals, such as owls and bats, are active during the night and rest during the day. This behavior helps them avoid predators, extreme daytime temperatures, or competition for food with diurnal species.
Submitted by: PaperMCQs
12
Easy nts

Which part of the brain controls balance and coordination?

  • A Cerebrum
  • B Medulla
  • C Hypothalamus
  • D Cerebellum
Permalink
Correct Answer: Option D — Cerebellum
Explanation: The cerebellum, located at the back of the brain, coordinates voluntary movements, posture, and balance. Damage to this region can result in difficulty walking, poor coordination, and tremors, a condition known as ataxia.
Submitted by: PaperMCQs
13
Hard nts

What type of lens is used to correct nearsightedness (myopia)?

  • A Bifocal lens
  • B Concave lens
  • C Convex lens
  • D Cylindrical lens
Permalink
Correct Answer: Option B — Concave lens
Explanation: Concave lenses diverge light rays before they enter the eye, helping to correctly focus images on the retina for nearsighted individuals. Myopia occurs when the eyeball is too long or the cornea too curved.
Submitted by: PaperMCQs
14
Medium nts

Which human organ is primarily responsible for producing bile?

  • A Liver
  • B Gallbladder
  • C Stomach
  • D Pancreas
Permalink
Correct Answer: Option A — Liver
Explanation: The liver produces bile, a fluid that aids in the digestion and absorption of fats in the small intestine. Bile is stored and concentrated in the gallbladder before being released during digestion of fatty foods.
Submitted by: PaperMCQs
15
Medium nts

What is the boiling point of water at sea level in Celsius?

  • A 90°C
  • B 80°C
  • C 100°C
  • D 110°C
Permalink
Correct Answer: Option C — 100°C
Explanation: Water boils at 100°C (212°F) at standard atmospheric pressure at sea level. The boiling point decreases at higher altitudes due to lower atmospheric pressure, which is why cooking takes longer in mountainous regions.
Submitted by: PaperMCQs
16
Easy nts

Which organ in the human body is primarily responsible for filtering blood?

  • A Lungs
  • B Kidneys
  • C Heart
  • D Liver
Permalink
Correct Answer: Option B — Kidneys
Explanation: The kidneys filter waste products and excess fluids from the blood, forming urine for excretion. Each kidney contains about a million nephrons, tiny filtering units essential for maintaining the body's fluid and electrolyte balance.
Submitted by: PaperMCQs
17
Easy fpsc ppsc nts

Which gas causes the fizzing and bubbling when a carbonated drink bottle is opened?

  • A Oxygen
  • B Nitrogen
  • C Methane
  • D Carbon dioxide
Permalink
Correct Answer: Option D — Carbon dioxide
Explanation: Carbon dioxide dissolved under pressure in carbonated drinks rapidly escapes as gas forming bubbles when the bottle is opened and pressure drops allowing the gas to come out of solution.
Submitted by: PaperMCQs
18
Medium fpsc ppsc nts

Which device converts sound waves into electrical signals for recording or amplification?

  • A Microphone
  • B Loudspeaker
  • C Capacitor
  • D Battery
Permalink
Correct Answer: Option A — Microphone
Explanation: A microphone uses a diaphragm that vibrates with incoming sound waves and converts those mechanical vibrations into electrical signals through electromagnetic or capacitive transduction.
Submitted by: PaperMCQs
19
Easy ppsc nts

Which planet is known as the Blue Planet due to its large amount of surface water?

  • A Mars
  • B Earth
  • C Venus
  • D Saturn
Permalink
Correct Answer: Option B — Earth
Explanation: Earth is called the Blue Planet because approximately 71 percent of its surface is covered by water giving it a distinctive blue appearance when viewed from space.
Submitted by: PaperMCQs
20
Medium fpsc ppsc nts

Which property of water causes it to expand when it freezes making ice less dense than liquid water?

  • A Hydrogen bonding creating a crystalline structure
  • B High specific heat capacity
  • C High surface tension
  • D High viscosity
Permalink
Correct Answer: Option A — Hydrogen bonding creating a crystalline structure
Explanation: Water expands when it freezes because hydrogen bonds arrange water molecules into a hexagonal crystalline lattice that takes up more space than the same number of liquid water molecules.
Submitted by: PaperMCQs
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