Class 8 Science questions with answers

195 NCERT Class 8 Science questions with answers, chapter by chapter, from Exploring the Investigative World of Science to Our Home: Earth, a Unique Life Sustaining Planet.

How to teach Class 8 Science · Class 8 Science common misconceptions

• Chapter 1: Exploring the Investigative World of Science

  15 questions · What investigation means in Grade 8 · Science is everywhere: no fancy laboratory required · What we can change, and what we can observe or measure · Changing only one thing at a time · Keeping notes, and letting the results raise the next question · From electric current to the phases of the Moon: how this year's physical topics lead into one another · Roots and kites: grounded observation balanced with free thinking · From a drop of water to a planet that is just right for life

• Chapter 2: The Invisible Living World: Beyond Our Naked Eye

  15 questions · Lenses, the microscope, and how the invisible world was found · The three basic parts of a cell and what each one does · What a plant cell carries that an animal cell does not · Why cells are shaped differently, and how the shape does the job · How cells build up into a whole organism · Unicellular and multicellular, and what a microbial cell has or lacks · What counts as a microorganism, the groups the chapter names, and where viruses sit · Fermentation, spoiling, and preserving: microbes in the kitchen · Microalgae: what they do for water, air and food · Rhizobium, root nodules, and why legumes are rotated with other crops · Decomposition: how microbes turn waste back into nutrients

• Chapter 3: Health: The Ultimate Treasure

  15 questions · The habits that keep us healthy · What health means · Our surroundings and our health · How communicable diseases spread · Non-communicable diseases · Stopping the spread · What a disease is, and its two kinds · Signs and symptoms · Which pathogen causes which disease · Immunity and vaccines · Jenner and the first vaccine · Antibiotics and antibiotic resistance

• Chapter 4: Electricity: Magnetic and Heating Effects

  15 questions · The heating effect of electric current · The magnetic effect of electric current · Where the magnetic effect is used · What makes a coil an electromagnet · What makes an electromagnet stronger · The poles of an electromagnet · Appliances that use the heating effect · When the heat is a problem · What the heat produced depends on · How a cell generates electricity · Dry cells and rechargeable batteries · Oersted and how the link was found

• Chapter 5: Exploring Forces

  15 questions, 1 with pictures · A force needs two objects · What a force can do · What a force is · Muscular force · What friction depends on · What friction is · Magnetic force · Contact and non-contact forces · Electrostatic force · Gravitational force · Mass and weight · Reading a spring balance · Floating and sinking · Weight is a force

• Chapter 6: Pressure, Winds, Storms, and Cyclones

  15 questions, 2 with pictures · Air exerts pressure · Making the area smaller on purpose · What pressure is · Working out a pressure · Pressure in a liquid column · A liquid presses in every direction · How large the atmospheric pressure is · Fast winds lower the pressure · How wind forms · Staying safe from lightning · Storms and thunderstorms · What causes lightning · How a cyclone forms

• Chapter 7: Particulate Nature of Matter

  15 questions · Atoms and molecules · Matter is made of constituent particles · The word particle means different things in different places · Dissolving does not destroy the particles · The spaces between particles · Gases can be compressed, liquids practically cannot · How particles move in a gas · How particles move in a liquid · How the spacing is ordered across the three states · Interparticle attraction and what decides its strength · The gaseous state, and what a fluid is · The solid state · Dissolving changes the total volume · The liquid state · Melting and the melting point

• Chapter 8: Nature of Matter: Elements, Compounds, and Mixtures

  15 questions, 1 with pictures · Heating sugar shows that it is a compound · Types of mixtures, and what counts as a component · What a mixture is · What pure means in science · Air is a uniform mixture · Alloys are uniform mixtures · Uniform and non-uniform mixtures · Dust is suspended in air, not part of it · Lime water shows carbon dioxide is in air · Elements and atoms · Metals, non-metals, and how many elements there are · Compounds combine elements in fixed ratios · How we use elements, compounds and mixtures · Passing electricity through water splits it into two gases · Minerals

• Chapter 9: The Amazing World of Solutes, Solvents, and Solutions

  15 questions, 6 with pictures · Saturated and unsaturated solutions · Uniform and non-uniform mixtures · What solute, solvent and solution are · Which component is the solvent · Concentration: dilute and concentrated · Solubility · Solubility of gases · Temperature and the solubility of solids · The volume of regular and irregular solids · Measuring mass, and how mass differs from weight · Choosing a measuring cylinder and its smallest reading · Measuring the volume of a liquid · Units of density and relative density · What density is · Temperature and density

• Chapter 10: Light: Mirrors and Lenses

  15 questions, 2 with pictures · A concave mirror converges and a convex mirror diverges · How spherical mirrors differ from a plane mirror · Telling a concave mirror from a convex one · The laws hold for every kind of mirror · What spherical mirrors are · Where concave and convex mirrors are used · Images formed by a concave mirror · Images formed by a convex mirror · The angle of incidence equals the angle of reflection · The incident ray, the normal and the two angles · The incident ray, the normal and the reflected ray lie in one plane · Concentrating sunlight with a concave mirror · A convex lens converges and a concave lens diverges · What a lens is · Where lenses are used

• Chapter 11: Keeping Time with the Skies

  15 questions · Locating the Moon in the sky · The Moon can be seen during the day · The Moon rises about fifty minutes later each day · The Sun's rising point shifts through the year · The day as a unit of time · The month and the year as units of time · The phases are not caused by the Earth's shadow · The phases of the Moon · The Moon shines by reflecting sunlight · Why the phases happen · Festivals and the calendars they follow · Solar calendars and leap years · Lunar calendars · Luni-solar calendars and the intercalary month · The Indian National Calendar

• Chapter 12: How Nature Works in Harmony

  15 questions, 1 with pictures · Habitat and its biotic and abiotic components · How organisms meet their biotic and abiotic needs · Interactions between biotic and abiotic components · Community · Competition keeps populations in balance · Ecosystems and their types · Population · The nested levels from individual to ecosystem · Mutualism, commensalism and parasitism · Food chains and trophic levels · Producers, consumers and the feeding categories · Every organism matters: direct and indirect effects · Food webs · How one change leads to another · Decomposers and decomposition

• Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet

  15 questions · The habitable zone and liquid water · The planets of the solar system · Earth's magnetic field as a shield · Earth's size, its gravity and holding on to an atmosphere · The biosphere and the interdependence of living things · The ozone layer and shielding from ultraviolet rays · Earth as a unique life-bearing planet · Earth's nearly circular orbit and steady conditions through the year · Reproduction, genes and the continuity of life · The four spheres and the balance that keeps Earth habitable · The greenhouse effect · The Earth's crust, the thin layer where life exists · The geosphere: soil, rocks, minerals and geodiversity · Air, water and sunlight sustaining life · Asexual reproduction