Science Questions — Batch 1 (1–25)
A rising-difficulty multiple-choice quiz focusing on key scientific concepts, reasoning, and real-world implications. Each question includes a spoken prompt and an educational fact for the correct answer.
Try this quiz
Play through the questions and see your score instantly
Ready to test your knowledge?
40 questions · Quick play · Instant results
Make your own quiz videos
Turn any topic into a polished video quiz — with AI-powered questions, voiceover, and animations. No video editing skills needed.
Unlimited quizzes, free to start
Create as many quizzes as you want. Describe your topic and AI builds the questions, answers, and explanations for you.
Customise everything
Pick from stunning templates, tweak colours and fonts, add your branding, and choose between vertical or landscape formats.
Export-ready videos
Download HD videos optimised for TikTok, YouTube Shorts, Instagram Reels, or full-length YouTube — one click, no editing.
No credit card required
Quiz Questions & Answers
Review every prompt, the correct responses, and helpful context to prep for your own run-through.
Question 1: What is the basic unit of life in biology?
Cell
Atom
Organ
Ecosystem
Question 2: Which state of matter has a definite volume but no definite shape?
Gas
Solid
Plasma
Liquid
Question 3: Which process plants use sunlight to make sugars?
Transpiration
Photosynthesis
Respiration
Fermentation
Question 4: What force pulls objects toward Earth’s center?
Magnetism
Buoyancy
Friction
Gravity
Question 5: Which element is most abundant in the Earth's atmosphere?
Carbon dioxide
Nitrogen
Argon
Oxygen
Question 6: Which of these describes an ionic bond?
Attraction between induced dipoles
Overlap of atomic nuclei
Electrostatic attraction between oppositely charged ions
Sharing of electron pairs between atoms
Question 7: What does the law of conservation of energy state?
Energy cannot be created or destroyed, only transformed
Energy increases in isolated systems
Energy always becomes heat
Energy depends on mass only
Question 8: Which organelle is responsible for producing ATP in eukaryotic cells?
Chloroplast
Golgi apparatus
Mitochondrion
Ribosome
Question 9: What type of reaction joins monomers into polymers by releasing water?
Redox reaction
Hydrolysis
Condensation (dehydration) reaction
Isomerization
Question 10: Which principle explains why a wing generates lift?
Archimedes' principle
Conservation of charge
Bernoulli’s principle combined with Newton's laws
Hooke's law
Question 11: What is the main difference between DNA and RNA?
DNA uses deoxyribose and is double-stranded; RNA uses ribose and is single-stranded
DNA is found only in the nucleus; RNA only in mitochondria
DNA contains uracil; RNA contains thymine
DNA is a protein; RNA is a lipid
Question 12: Which experimental design element reduces researcher and participant bias?
Double-blind protocol
Case series
Cross-sectional snapshot
Open-label study
Question 13: Why does increasing temperature generally speed up chemical reactions?
Higher temperature raises molecular kinetic energy and collision frequency
Temperature adds electrons to reactants
Warmer conditions reduce entropy
Heat creates new catalysts
Question 14: What is the primary climate effect of increased atmospheric CO2?
Reflects more sunlight to space
Removes water vapor from the air
Enhances greenhouse effect, warming the planet
Directly causes acid rain
Question 15: Which type of electromagnetic radiation has the shortest wavelength?
Gamma rays
Microwaves
Visible light
Radio waves
Question 16: How does natural selection drive evolutionary change?
All mutations are beneficial and fixed
Organisms willfully change traits to adapt
Genes disappear when unused in lifetime
Differential survival and reproduction of organisms with advantageous traits
Question 17: What is an ecological keystone species?
Any apex predator
A species with a disproportionate effect on ecosystem structure
The most abundant species in an ecosystem
A species that lives only in keystone habitats
Question 18: Which method best tests causation rather than correlation?
Case report
Randomized controlled experiment
Ecological correlation study
Cross-sectional survey
Question 19: What key property makes water a good solvent for biological molecules?
Its metallic bonding
High viscosity compared to oils
Its hydrophobic surface tension
Its polarity and ability to form hydrogen bonds
Question 20: Why are control groups essential in experiments?
They guarantee positive outcomes
They provide a baseline to compare the effect of the variable tested
They increase sample size automatically
They eliminate all measurement error
Question 21: What does pH measure in a solution?
Total dissolved solids
Hydrogen ion concentration (acidity)
Oxygen saturation
Electrical conductivity
Question 22: Which process best describes how enzymes speed reactions?
They change the net energy released by reactions
They always use ATP to drive reactions
They increase reactant concentration by creating molecules
They lower the activation energy by stabilizing transition states
Question 23: What is the significance of the half-life of a radioactive isotope?
The time it takes to produce the isotope
The time for half the radioactive nuclei to decay
The time until the isotope becomes stable
The lifespan of the isotope in years only
Question 24: How do vaccines primarily protect populations?
They induce immune memory, reducing infection and transmission
They remove pathogens from the environment directly
They rely solely on antibiotics to work
They change pathogens into harmless forms permanently
Question 25: Why is sample size important for experimental reliability?
Larger samples reduce random error and increase statistical power
It always removes bias completely
It guarantees the hypothesis is true
It changes the experimental variable's effect
Question 26: Which biomolecule primarily stores genetic information in cells?
Carbohydrates
DNA
Polysaccharides
Lipids
Question 27: What principle explains why objects accelerate at the same rate in a vacuum regardless of mass?
Hooke's law
Conservation of momentum
Equivalence principle
Second law of thermodynamics
Question 28: Which type of bond involves sharing electron pairs between atoms?
Hydrophobic interaction
Metallic bond
Covalent bond
Ionic bond
Question 29: Why do catalysts speed up chemical reactions without being consumed?
They increase temperature
They lower the activation energy
They change products
They add more reactants
Question 30: Which organ system regulates internal temperature and fluid balance primarily through sweat and blood flow?
Endocrine system
Integumentary system
Respiratory system
Skeletal system
Question 31: Which process converts atmospheric nitrogen into biologically usable forms by certain bacteria?
Nitrogen fixation
Denitrification
Ammonification
Nitrification
Question 32: What measurement indicates the average kinetic energy of particles in a substance?
Pressure
Mass
Temperature
Entropy
Question 33: Which technique separates DNA fragments by size using an electric field?
Spectroscopy
Gel electrophoresis
Chromatography
PCR
Question 34: Why does adding a catalyst not change the equilibrium position of a reversible reaction?
It speeds both forward and reverse reactions equally
It alters reactant concentrations
It changes the temperature
It removes products permanently
Question 35: Which concept explains why small changes in initial conditions can lead to large differences in long-term behavior for some systems?
Chaos theory
Linear response
Thermal equilibrium
Homeostasis
Question 36: Which law relates the pressure and volume of a gas at constant temperature?
Avogadro's law
Gay-Lussac's law
Charles's law
Boyle's law
Question 37: What is the primary reason some antibiotics do not work against viruses?
Viruses are immune to chemicals
Antibiotics target bacterial cell structures absent in viruses
Viruses are larger than bacteria
Antibiotics can't enter host cells
Question 38: Which model describes light as both a particle and a wave to explain phenomena like photoelectric effect and interference?
Classical wave theory
Newtonian optics
Wave-particle duality
Corpuscular theory only
Question 39: Which physiological feedback type reverses a change to maintain internal stability?
Oscillatory feedback
Feedforward control
Positive feedback
Negative feedback
Question 40: Which atmospheric layer contains the ozone layer that absorbs harmful UV-B radiation?
Troposphere
Stratosphere
Thermosphere
Mesosphere