Everyday Science helps us understand the scientific principles behind our daily activities — from why the sky looks blue to how electricity powers our homes. These concepts form a major part of competitive exams, school tests, and general knowledge. To help you strengthen your understanding, here are Top 100 Important, well-explained MCQs of Everyday Science designed to test a wide range of topics including physics, chemistry, biology, space science, technology, environment, and human body systems.
Section 1: Physics in Everyday Life (1–25)
- When we see a rainbow after rain, it appears curved and colourful. Which scientific process mainly causes the separation of white sunlight into different colours?
a) Reflection
b) Refraction and dispersion of light through water droplets
c) Echo formation
d) Solar heating
Answer: b - When you push a heavy box on a rough floor and it does not move, which force is responsible for opposing your push?
a) Magnetic force
b) Static friction
c) Centripetal force
d) Gravitational force
Answer: b - A metal spoon becomes hot quickly after being placed in a cup of boiling tea. This is mainly due to which physical property of metals?
a) Poor conductor of heat
b) High density
c) Excellent thermal conductivity
d) Low electrical resistance
Answer: c - When a person standing at a railway track hears a train horn changing pitch as the train approaches and then moves away, which scientific principle explains this?
a) Brownian motion
b) Doppler effect
c) Newton’s second law
d) Archimedes’ principle
Answer: b - Clothes dry faster on a windy day because wind increases the rate of evaporation by:
a) Increasing atmospheric pressure
b) Removing the moist air near the surface
c) Decreasing the sun’s heat
d) Adding more water to the air
Answer: b - When a person uses spectacles to clearly see distant objects, which type of defect in the eye are they correcting?
a) Hypermetropia
b) Myopia
c) Cataract
d) Colour blindness
Answer: b - A hot air balloon rises because hot air inside the balloon becomes:
a) Heavier than surrounding air
b) Cooler than surrounding air
c) Less dense than surrounding air
d) More humid than surrounding air
Answer: c - When a car suddenly stops and passengers jerk forward, which law of motion explains this behaviour?
a) Newton’s first law (Inertia)
b) Newton’s second law
c) Newton’s third law
d) Law of gravitation
Answer: a - The reason why sound cannot travel in outer space is because:
a) Gravity is strong there
b) There is no medium like air to carry vibrations
c) Sound travels faster in space
d) Too much radiation blocks sound
Answer: b - Ice floats on water even though it is solid because:
a) It is colder
b) It contains air
c) Its density is lower than liquid water
d) Its weight is less than water
Answer: c - The bending of a straw when placed in a glass of water is due to:
a) Total internal reflection
b) Refraction of light
c) Diffraction
d) Absorption of light
Answer: b - When you rub your hands together in winter and feel warmth, which energy transformation is happening?
a) Chemical to electrical
b) Mechanical to heat
c) Heat to sound
d) Light to chemical
Answer: b - The turning of the blades of a fan when electricity is supplied is an example of:
a) Chemical energy to sound energy
b) Electrical energy to mechanical energy
c) Nuclear energy to heat energy
d) Sound energy to motion
Answer: b - We hear thunder after seeing lightning because:
a) Sound travels faster than light
b) Sound travels slower than light
c) Light cannot travel through air
d) Thunder is created after lightning
Answer: b - When warm air rises and cool air moves in to replace it, this circulation of air creates:
a) Sound waves
b) Convection currents
c) Condensation
d) Evaporation process
Answer: b - The ability of a body to resist changes in its state of motion is called:
a) Momentum
b) Inertia
c) Acceleration
d) Velocity
Answer: b - When a cyclist rides at a constant speed and suddenly stops pedaling, but the bicycle continues moving for some distance, this is due to:
a) Friction
b) Inertia
c) Centripetal force
d) Static energy
Answer: b - Pressure cookers cook food faster because the internal pressure:
a) Decreases boiling point of water
b) Increases boiling point of water
c) Removes heat faster
d) Converts steam into water quickly
Answer: b - A compass needle always points north because:
a) Earth has no gravity
b) Earth has a magnetic field
c) Sunlight affects magnetism
d) Water vapour attracts magnets
Answer: b - When a car turns on a curved road, passengers feel pushed outward due to:
a) Centripetal force
b) Centrifugal force
c) Gravitational pull
d) Elastic force
Answer: b - A magnifying glass helps us see small objects because it uses a:
a) Concave mirror
b) Convex lens
c) Flat mirror
d) Prism
Answer: b - When an electric bulb glows, the filament inside becomes extremely hot because of:
a) Magnetic energy
b) Electrical resistance
c) Solar radiation
d) Chemical reactions
Answer: b - If you place a glass over a burning candle, the flame goes out because:
a) Carbon dioxide produces more light
b) Oxygen supply gets cut off
c) Glass absorbs light
d) Heat escapes
Answer: b - When you shake a bottle of soda and open it quickly, it fizzes out due to:
a) Decrease in light
b) Pressure drop releasing dissolved CO₂
c) Increase in temperature
d) Water freezing
Answer: b - A solar panel generates electricity because it converts:
a) Sound energy to mechanical energy
b) Light energy to electrical energy
c) Heat energy to nuclear energy
d) Mechanical energy to heat
Answer: b
Section 2: Chemistry in Daily Life (26–50)
- When iron is left exposed to moist air for a long time, it forms reddish-brown rust. This is a result of:
a) Condensation
b) Oxidation reaction
c) Sublimation
d) Neutralization
Answer: b - The reason we store milk in the refrigerator is that cooling slows down which process?
a) Freezing
b) Microbial growth and spoilage
c) Evaporation
d) Dehydration
Answer: b - Table salt dissolves quickly in water because of:
a) Insolubility of sodium
b) Strong attraction between water molecules and salt ions
c) Water becoming solid
d) Reaction with air
Answer: b - When water changes into vapour on heating, it undergoes:
a) Sublimation
b) Evaporation
c) Melting
d) Condensation
Answer: b - LPG used in homes is stored in liquid form because:
a) It is easier to smell
b) Liquefied gas occupies less space
c) Liquid LPG is non-flammable
d) It dissolves in water
Answer: b - The sour taste of lemons is due to the presence of:
a) Citric acid
b) Hydrochloric acid
c) Carbon dioxide
d) Potassium salt
Answer: a - When vinegar and baking soda react, they release bubbles due to the formation of:
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Helium
Answer: c - Hard water does not easily form lather with soap because it contains:
a) Calcium and magnesium salts
b) Sodium chloride
c) Iron particles
d) Pure hydrogen
Answer: a - When ice melts and becomes water, the change is:
a) Chemical
b) Irreversible
c) Physical and reversible
d) Nuclear
Answer: c - The bubbles in boiling water are formed mainly of:
a) Oxygen
b) Hydrogen
c) Steam (water vapour)
d) Nitrogen
Answer: c - We use antacids for indigestion because they:
a) Increase acidity
b) Neutralize excess stomach acid
c) Stop digestion
d) Break down fats
Answer: b - The gas used for extinguishing fire is:
a) Oxygen
b) Carbon dioxide
c) Helium
d) Neon
Answer: b - A substance that does not allow electricity to pass through it is known as:
a) Conductor
b) Insulator
c) Solute
d) Catalyst
Answer: b - Which chemical is added to cooking gas cylinders to detect leakage due to its strong smell?
a) Ethanol
b) Methane
c) Mercaptan
d) Ammonia
Answer: c - When milk turns into curd, the reaction is due to:
a) Freezing
b) Bacterial fermentation
c) Dehydration
d) Distillation
Answer: b - Stainless steel does not rust because it contains:
a) Gold
b) Chromium
c) Aluminium
d) Nitrogen
Answer: b - Sugar dissolves faster in hot water because heat:
a) Cools molecules
b) Weakens sugar
c) Increases kinetic energy of molecules
d) Stops movement
Answer: c - The chemical formula of common salt is:
a) H₂O
b) NaCl
c) CO₂
d) CaO
Answer: b - Which gas is responsible for the fizz in soft drinks?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Hydrogen
Answer: c - When petrol burns in a car engine, the energy released is:
a) Chemical energy converted to mechanical energy
b) Solar energy to chemical energy
c) Electrical to sound
d) Light to heat
Answer: a - The white deposits in electric kettles are due to:
a) Sugar
b) Calcium carbonate
c) Alcohol
d) Rust
Answer: b - The gas needed for photosynthesis is:
a) Nitrogen
b) CO₂
c) O₂
d) Helium
Answer: b - The chemical used in bleaching powder that makes it effective is:
a) Chlorine
b) Hydrogen
c) Iron
d) Carbon
Answer: a - The pH value of a neutral substance like pure water is:
a) 0
b) 7
c) 10
d) 14
Answer: b - The process of separating a dissolved solid from a liquid by heating is called:
a) Filtration
b) Evaporation
c) Melting
d) Respiration
Answer: b
Section 3: Biology & Human Body (51–75)
- Human blood appears red due to the presence of a pigment called:
a) Melanin
b) Chlorophyll
c) Haemoglobin
d) Albumin
Answer: c - The part of the human brain responsible for memory and intelligence is:
a) Cerebrum
b) Cerebellum
c) Medulla
d) Spinal cord
Answer: a - The organ responsible for filtering blood and removing waste materials is:
a) Heart
b) Kidney
c) Liver
d) Lungs
Answer: b - We feel thirsty after exercise because our body loses water mainly through:
a) Urine
b) Sweat
c) Tears
d) Digestion
Answer: b - Fruits turn brown when cut due to:
a) Oxidation
b) Reduction
c) Fermentation
d) Evaporation
Answer: a - The smallest unit of life in all organisms is the:
a) Tissue
b) Cell
c) Organ
d) Organ system
Answer: b - When you get a cut, blood clots due to the action of:
a) WBC
b) Plasma
c) Platelets
d) Hormones
Answer: c - The human heart pumps blood using:
a) Smooth muscles
b) Cardiac muscles
c) Voluntary muscles
d) Skeletal muscles
Answer: b - The windpipe, which carries air to the lungs, is scientifically called:
a) Oesophagus
b) Trachea
c) Bronchi
d) Larynx
Answer: b - When our body temperature rises, sweating helps to cool us through:
a) Freezing
b) Evaporation
c) Condensation
d) Sublimation
Answer: b - People suffering from night blindness lack which vitamin?
a) Vitamin A
b) Vitamin C
c) Vitamin B12
d) Vitamin D
Answer: a - The virus responsible for causing COVID-19 spreads mainly through:
a) Contaminated water
b) Respiratory droplets
c) Mosquito bites
d) Soil
Answer: b - The organ that produces insulin to control blood sugar is:
a) Liver
b) Pancreas
c) Kidney
d) Heart
Answer: b - When we breathe in, the diaphragm:
a) Relaxes and moves up
b) Contracts and moves down
c) Does not move
d) Breaks down
Answer: b - The bones in the human body are connected by:
a) Muscles
b) Ligaments
c) Tendons
d) Glands
Answer: b - The process by which plants lose water through leaves is called:
a) Transpiration
b) Respiration
c) Photosynthesis
d) Absorption
Answer: a - The basic unit of the nervous system that carries impulses is:
a) Nephron
b) Neuron
c) Retina
d) Hormone
Answer: b - Human nails are made of a strong protein called:
a) Elastin
b) Collagen
c) Keratin
d) Myosin
Answer: c - The blood vessels that bring blood back to the heart are:
a) Arteries
b) Veins
c) Capillaries
d) Bronchioles
Answer: b - The organ responsible for detoxifying harmful chemicals in our body is:
a) Heart
b) Liver
c) Lungs
d) Stomach
Answer: b - The sense organ that helps maintain balance is located in the:
a) Inner ear
b) Nose
c) Skin
d) Tongue
Answer: a - The liquid part of blood that carries nutrients is called:
a) Plasma
b) Platelets
c) Lymph
d) Urea
Answer: a - Human teeth are coated with the hardest substance in the body called:
a) Tendon
b) Cementum
c) Enamel
d) Fibre
Answer: c - The organ where digestion starts is the:
a) Stomach
b) Mouth
c) Small intestine
d) Liver
Answer: b - The hormone that regulates sleep is called:
a) Insulin
b) Melatonin
c) Thyroxine
d) Estrogen
Answer: b
Section 4: Space, Technology & Environment (76–100)
- The reason we experience day and night on Earth is because the planet:
a) Revolves around the sun
b) Rotates on its axis
c) Tilts away from the sun
d) Moves faster in orbit
Answer: b - When the moon blocks sunlight from reaching Earth partially or fully, it is called:
a) Lunar eclipse
b) Solar eclipse
c) Planetary eclipse
d) Mercury transit
Answer: b - The star around which our solar system revolves is:
a) Sirius
b) Sun
c) Polaris
d) Andromeda
Answer: b - Satellites orbit the Earth due to a balance between gravitational force and:
a) Magnetic force
b) Centripetal force
c) Nuclear force
d) Chemical force
Answer: b - The gas responsible for the greenhouse effect and global warming is:
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Helium
Answer: c - The ozone layer in the atmosphere protects us mainly from:
a) UV radiation
b) Radio waves
c) Sound waves
d) Infrared waves
Answer: a - Recycling of plastic helps the environment because it:
a) Increases pollution
b) Reduces landfill waste
c) Destroys fossil fuels
d) Stops rainfall
Answer: b - The branch of science that studies earthquakes is called:
a) Ecology
b) Seismology
c) Astronomy
d) Botany
Answer: b - A smartphone works using tiny electronic switches called:
a) Transformers
b) Transistors
c) Valves
d) Diodes
Answer: b - The energy stored in food is classified as:
a) Nuclear energy
b) Chemical energy
c) Mechanical energy
d) Light energy
Answer: b - The planet known for its rings is:
a) Earth
b) Mars
c) Saturn
d) Jupiter
Answer: c - A Wi-Fi router works on which type of waves?
a) Sound waves
b) Radio waves
c) Seismic waves
d) Water waves
Answer: b - Electric cars are considered eco-friendly mainly because they:
a) Produce more heat
b) Do not use batteries
c) Emit no smoke
d) Run on petrol
Answer: c - The main source of oxygen on Earth is:
a) Factories
b) Oceans and plants
c) Wind
d) Soil
Answer: b - A virus is different from bacteria because viruses can only:
a) Reproduce inside living cells
b) Move independently
c) Make food
d) Perform respiration
Answer: a - The Earth’s protective magnetic field is generated by movements in the:
a) Mantle
b) Outer core
c) Crust
d) Atmosphere
Answer: b - The unit used to measure electrical current is:
a) Volt
b) Ampere
c) Watt
d) Newton
Answer: b - Which renewable energy source uses moving air to generate electricity?
a) Solar power
b) Wind power
c) Geothermal power
d) Nuclear power
Answer: b - The process of converting waste into reusable material is called:
a) Combustion
b) Polluting
c) Recycling
d) Distillation
Answer: c - The largest planet in our solar system is:
a) Earth
b) Jupiter
c) Neptune
d) Saturn
Answer: b - The natural satellite of Earth is:
a) Mars
b) Moon
c) Venus
d) Pluto
Answer: b - Fossil fuels harm the environment because they:
a) Produce oxygen
b) Release carbon dioxide
c) Make the ground fertile
d) Increase rainfall
Answer: b - Earthquakes are measured using an instrument known as:
a) Thermometer
b) Seismograph
c) Barometer
d) Altimeter
Answer: b - The primary cause of acid rain is the emission of:
a) Nitrogen and sulfur oxides
b) Hydrogen gas
c) Carbon monoxide only
d) Water vapour
Answer: a - Solar energy is considered renewable because:
a) The sun will last for billions of years
b) It produces pollution
c) It cannot be stored
d) It is expensive
Answer: a
Everyday Science is all around us—shaping the way we cook, travel, communicate, and even stay healthy. By going through these 100 carefully crafted MCQs, you have revised the core principles that explain how the world works on a daily basis. These questions not only strengthen your general awareness but also sharpen your understanding of scientific concepts used in real life.
Whether you are preparing for a competitive exam, school test, or simply want to improve your knowledge, consistent practice is the key. Keep exploring, keep questioning, and keep learning—because science becomes truly powerful when we understand how it connects to our everyday life.
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