Download NEET 2022 Question Paper with Solutions PDF for Free

What is the SI unit of power?
The SI unit of power is the watt (W).

What is the function of a transformer in an electrical circuit?
A transformer is used to increase or decrease the voltage of alternating current (AC).

Why does a freely falling object experience weightlessness?
A freely falling object is in free fall, experiencing only gravitational acceleration, making it seem weightless.

How does a concave mirror form an image when the object is placed between the focus and the pole?
The concave mirror forms a virtual, erect, and enlarged image behind the mirror.

Why does sound travel faster in solids than in gases?
Sound travels faster in solids due to the closer arrangement of particles, allowing faster transmission of vibrations.

What happens to the resistance of a conductor if its length is doubled?
The resistance of the conductor doubles when its length is doubled.

What is the principle behind a hydraulic lift?
A hydraulic lift operates on Pascal’s law, which states that pressure applied to a confined fluid is transmitted equally in all directions.

Why does a ray of light bend when it passes from air to water?
Light bends due to refraction, as water has a higher optical density than air, slowing down the light.

What is the function of a fuse in an electric circuit?
A fuse prevents excess current flow, protecting electrical devices from damage.

Why does a black surface absorb more heat than a white surface?
Black surfaces absorb more heat as they absorb all wavelengths of light, while white surfaces reflect them.

How does atmospheric pressure change with altitude?
Atmospheric pressure decreases as altitude increases due to reduced air density.

Why does an object experience greater buoyant force in water than in air?
Water has a higher density than air, causing a greater upward buoyant force on submerged objects.

What happens to the frequency of a wave if the source moves toward the observer?
The frequency increases due to the Doppler effect.

Why is the sky blue?
The sky appears blue because shorter blue wavelengths scatter more than longer red wavelengths in Earth's atmosphere.

How does an electric motor work?
An electric motor converts electrical energy into mechanical energy using the principle of electromagnetic induction.

Why does a compass needle point north?
A compass needle aligns with Earth's magnetic field, pointing towards the magnetic north pole.

What is the role of a capacitor in a circuit?
A capacitor stores electrical energy and releases it when needed.

Why does a rolling ball eventually stop on the ground?
A rolling ball stops due to friction between the ball and the ground.

How does a convex lens form an image when the object is placed at infinity?
A convex lens forms a real, inverted, and highly diminished image at its focal point.

What happens when a bar magnet is cut in half?
Each half forms a new magnet with both a north and south pole.

Chemistry Questions and Answers

Why does rust form on iron objects?
Rust forms due to the reaction of iron with oxygen and water, forming iron oxide.

What is the chemical formula of common salt?
The chemical formula of common salt is NaCl (sodium chloride).

Why do acids have a sour taste?
Acids have a sour taste due to the presence of hydrogen ions (H⁺) in their aqueous solutions.

What happens when an acid reacts with a base?
An acid reacts with a base to form salt and water in a neutralization reaction.

Why does soap form lather in soft water but not in hard water?
Hard water contains calcium and magnesium ions, which react with soap to form scum instead of lather.

What is the main component of natural gas?
Methane (CH₄) is the main component of natural gas.

Why does lemon juice turn blue litmus red?
Lemon juice is acidic in nature, so it turns blue litmus paper red.

What is the pH of pure water?
The pH of pure water is 7, which is neutral.

Why does baking soda help in baking?
Baking soda releases carbon dioxide gas when heated, making baked goods rise.

What happens when vinegar is mixed with baking soda?
Vinegar reacts with baking soda to produce carbon dioxide gas, water, and salt.

Why is stainless steel resistant to rusting?
Stainless steel contains chromium, which forms a protective oxide layer that prevents rusting.

Why does charcoal help in water purification?
Charcoal absorbs impurities and contaminants from water due to its porous structure.

What happens when sugar is heated strongly?
When heated, sugar caramelizes and eventually decomposes into carbon and water vapor.

Why does a candle flame appear yellow?
A candle flame appears yellow due to the incomplete combustion of wax, producing glowing carbon particles.

What is the main component of glass?
Silica (SiO₂) is the main component of glass.

Why does milk turn sour over time?
Milk turns sour due to the bacterial fermentation of lactose into lactic acid.

What is the chemical formula of limestone?
The chemical formula of limestone is CaCO₃ (calcium carbonate).

Why does an iron nail sink in water but a ship floats?
An iron nail sinks because it is denser than water, whereas a ship floats due to its hollow structure reducing overall density.

Why do perfumes evaporate quickly?
Perfumes contain volatile compounds that evaporate quickly at room temperature.

What gas is released when limewater is exposed to carbon dioxide?
Carbon dioxide reacts with limewater to form calcium carbonate, turning it milky.

Biology Questions and Answers

Why do plants carry out photosynthesis?
Plants carry out photosynthesis to produce glucose and oxygen using sunlight, carbon dioxide, and water.

What is the basic structural and functional unit of life?
The cell is the basic structural and functional unit of life.

Why does blood appear red?
Blood appears red due to the presence of hemoglobin, which binds with oxygen.

What is the function of the mitochondria?
Mitochondria generate ATP, the energy currency of the cell.

Why do we sweat?
Sweating helps regulate body temperature by cooling the skin as sweat evaporates.

What is the function of the human heart?
The heart pumps blood, supplying oxygen and nutrients to the body.

Why do leaves appear green?
Leaves appear green due to the presence of chlorophyll, which absorbs light for photosynthesis.

How does vaccination work?
Vaccination introduces a weakened or dead pathogen to stimulate immunity.

Why do fish have gills?
Fish have gills to extract oxygen from water.

Why is DNA important?
DNA carries genetic information necessary for growth, development, and reproduction.

What is the function of the kidneys?
Kidneys filter waste from the blood and regulate water balance.

Why do our pupils dilate in the dark?
Pupils dilate to allow more light into the eye for better vision in the dark.

Why do we need oxygen to survive?
Oxygen is essential for cellular respiration, which generates energy.

What is the role of white blood cells?
White blood cells help fight infections and diseases.

Why do bones heal after a fracture?
Bones heal due to the activity of bone-forming cells called osteoblasts.

Why do we blink our eyes?
Blinking keeps the eyes moist and protects them from dust.

Why do plants need nitrogen?
Plants need nitrogen for protein and DNA synthesis.

What is the function of the nervous system?
The nervous system controls body functions and responses.

Why does food spoil over time?
Food spoils due to bacterial and fungal growth.

What is the importance of biodiversity?
Biodiversity maintains ecosystem stability and provides resources for survival.