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Everyday Science MCQs

212 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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21
Medium css

What causes tides in the ocean?

  • A Earth's rotation alone
  • B Wind patterns
  • C Ocean currents
  • D Gravitational pull of the moon
Permalink
Correct Answer: Option D — Gravitational pull of the moon
Explanation: Tides are primarily caused by the gravitational pull of the moon on Earth's oceans, creating bulges of water on the sides facing toward and away from the moon. The sun's gravity also contributes to a lesser extent.
Submitted by: PaperMCQs
22
Medium fpsc

Which gland is known as the master gland of the human body?

  • A Adrenal gland
  • B Thyroid gland
  • C Pituitary gland
  • D Pineal gland
Permalink
Correct Answer: Option C — Pituitary gland
Explanation: The pituitary gland is called the master gland because it regulates other endocrine glands and controls hormones affecting growth, metabolism, and reproduction. It is located at the base of the brain and works closely with the hypothalamus.
Submitted by: PaperMCQs
23
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
24
Medium pms

Which sense organ is responsible for detecting sound?

  • A Nose
  • B Tongue
  • C Eye
  • D Ear
Permalink
Correct Answer: Option D — Ear
Explanation: The ear detects sound waves and converts them into nerve signals interpreted by the brain. It also plays a crucial role in maintaining balance through the vestibular system located in the inner ear.
Submitted by: PaperMCQs
25
Medium css

What is the name of the process by which plants lose water through their leaves?

  • A Transpiration
  • B Osmosis
  • C Respiration
  • D Photosynthesis
Permalink
Correct Answer: Option A — Transpiration
Explanation: Transpiration is the process by which water evaporates from plant leaves through tiny pores called stomata. It helps plants absorb nutrients from soil, regulate temperature, and maintain the flow of water throughout their structure.
Submitted by: PaperMCQs
26
Medium pms

Which vitamin is essential for good vision?

  • A Vitamin A
  • B Vitamin B12
  • C Vitamin D
  • D Vitamin C
Permalink
Correct Answer: Option A — Vitamin A
Explanation: Vitamin A is crucial for maintaining healthy vision, particularly for seeing in low light conditions, as it forms a component of the light-sensitive pigment rhodopsin in the retina. Deficiency can lead to night blindness.
Submitted by: PaperMCQs
27
Medium fpsc

What causes rainbows to form in the sky?

  • A Refraction of light
  • B Absorption of heat
  • C Wind currents
  • D Reflection of clouds
Permalink
Correct Answer: Option A — Refraction of light
Explanation: Rainbows form when sunlight is refracted, or bent, as it passes through raindrops, splitting into its component colors. The light then reflects internally within the droplet and refracts again as it exits, creating the arc of colors.
Submitted by: PaperMCQs
28
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
29
Medium fpsc

Which organ produces antibodies to fight infections?

  • A Platelets
  • B Bone marrow
  • C Red blood cells
  • D White blood cells
Permalink
Correct Answer: Option D — White blood cells
Explanation: White blood cells, particularly lymphocytes, produce antibodies that identify and neutralize pathogens like bacteria and viruses. They form a critical part of the immune system's defense against infections and diseases.
Submitted by: PaperMCQs
30
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
31
Medium pms

Which mineral is essential for strong bones and teeth?

  • A Calcium
  • B Magnesium
  • C Sodium
  • D Potassium
Permalink
Correct Answer: Option A — Calcium
Explanation: Calcium is vital for building and maintaining strong bones and teeth, and also plays a role in muscle function and nerve signaling. Dairy products, leafy greens, and fortified foods are common dietary sources of calcium.
Submitted by: PaperMCQs
32
Medium ppsc

What is the smallest unit of life?

  • A Organ
  • B Cell
  • C Atom
  • D Tissue
Permalink
Correct Answer: Option B — Cell
Explanation: The cell is the basic structural and functional unit of all living organisms, capable of carrying out life processes independently. Cells can be prokaryotic, like bacteria, or eukaryotic, like those found in plants and animals.
Submitted by: PaperMCQs
33
Medium css

What is the powerhouse of the cell called?

  • A Mitochondria
  • B Nucleus
  • C Ribosome
  • D Golgi body
Permalink
Correct Answer: Option A — Mitochondria
Explanation: Mitochondria generate ATP, the energy currency of cells, through cellular respiration, earning them the nickname 'powerhouse of the cell'. They have their own DNA and are believed to have originated from ancient bacteria.
Submitted by: PaperMCQs
34
Medium fpsc

What causes the greenhouse effect on Earth?

  • A Trapped heat by gases
  • B Ozone depletion
  • C Solar flares
  • D Ocean currents
Permalink
Correct Answer: Option A — Trapped heat by gases
Explanation: The greenhouse effect occurs when gases like carbon dioxide and methane trap heat from the sun in Earth's atmosphere, warming the planet. While natural and necessary for life, excessive greenhouse gases contribute to global climate change.
Submitted by: PaperMCQs
35
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
36
Medium ppsc

What is the hardest natural substance found on Earth?

  • A Diamond
  • B Quartz
  • C Granite
  • D Iron
Permalink
Correct Answer: Option A — Diamond
Explanation: Diamond is the hardest known natural material, composed of carbon atoms arranged in a crystal lattice structure. Its hardness is measured as 10 on the Mohs scale, making it valuable for both jewelry and industrial cutting tools.
Submitted by: PaperMCQs
37
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
38
Medium fpsc

What is the pH value of pure water?

  • A 9
  • B 5
  • C 7
  • D 3
Permalink
Correct Answer: Option C — 7
Explanation: Pure water has a pH of 7, making it neutral on the pH scale that ranges from 0 to 14. Values below 7 indicate acidity while values above 7 indicate alkalinity, important in chemistry and biology.
Submitted by: PaperMCQs
39
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
40
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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