Class 7 Science questions with answers

165 NCERT Class 7 Science questions with answers, chapter by chapter, from Exploring Substances: Acidic, Basic and Neutral to Earth, Moon and the Sun.

How to teach Class 7 Science · Class 7 Science common misconceptions

• Chapter 2: Exploring Substances: Acidic, Basic and Neutral

  15 questions · How acids and bases behave: sour, bitter, slippery, and the limits of taste · Red rose extract: red in acidic, green in basic · Litmus: what it is and what its two colour changes mean · Sorting substances into acidic, basic and neutral · Turmeric paper: red in basic, unchanged in both acidic and neutral · Preparing a natural indicator from a flower · Neutralisation: what an acid and a base make together · Olfactory indicators: when the clue is a smell, not a colour · Neutralisation put to work: ant bites, soil and factory waste · The secret message: choosing a writing liquid and a spray to match · P.C. Ray and the writing of India's chemical history

• Chapter 3: Electricity: Circuits and their Components

  15 questions, 5 with pictures · The electric cell and its two terminals · A battery: cells joined positive terminal to negative terminal · The LED: no filament, and current in one direction only · The incandescent lamp: filament, terminals, and what 'fused' means · The electrical circuit: a complete path for the current · The switch: closing and breaking the circuit · Circuit symbols and the circuit diagram · Conductors and insulators, and why both are needed · Using a circuit as a test: finding the fault and identifying components · Where electricity comes from, what it is used for, and what may be experimented with

• Chapter 4: The World of Metals and Non-metals

  15 questions, 1 with pictures · Lustre and hardness, and the metals that break the pattern · Ductility: drawn into wires · Malleability: beaten into sheets, and what brittle means · Sonority: the ringing sound of a metal · Conduction of heat: why vessels are metal and handles are not · Conduction of electricity: good conductors and poor conductors · Metals with air and water: oxides that are basic · Non-metals: acidic oxides, and what counts as an element · Rusting: what has to be present, and how it is prevented · Properties decide uses: metals, non-metals and alloys in everyday life

• Chapter 5: Changes Around Us: Physical and Chemical

  15 questions, 4 with pictures · Noticing a change, and the senses that notice it · A physical change: the appearance alters, the substance does not · Changes that can be reversed and changes that cannot · A chemical change: one or more new substances are formed · Turning lime water milky: the test for carbon dioxide · Rusting is a chemical change · Combustion: reacting with oxygen, giving out heat and light · Ignition temperature and the three requirements for combustion · A burning candle: both changes in one process · Weathering and erosion: slow natural changes in rock · Desirable and undesirable changes, and changes with long-term effects

• Chapter 6: Adolescence: A Stage of Growth and Change

  15 questions, 3 with pictures · Adolescence: the stage between childhood and adulthood · Meeting nutritional needs during adolescence · The physical changes: height, build, voice, hair and skin · Secondary sexual characteristics, and what puberty names · The menstrual cycle, and the myths around it · Emotional and behavioural changes, and what to do with them · Hormones: why the changes happen when they do · Personal hygiene and menstrual hygiene · Physical activity, and a balanced social life online and in person · Avoiding harmful substances: learning to say NO · Variation between individuals is completely normal

• Chapter 7: Heat Transfer in Nature

  15 questions, 9 with pictures · Conduction, and Good and Poor Conductors of Heat · Convection in Liquids and Gases · Radiation: Heat Transfer Without a Medium · Unequal Heating of Land and Water: Sea Breeze and Land Breeze · The Water Cycle · Infiltration, Groundwater and Aquifers

• Chapter 8: Measurement of Time and Motion

  15 questions, 1 with pictures · Devices for Measuring Time, Old and New · The Simple Pendulum and its Time Period · The SI Unit of Time and How Units are Written · Deciding Which of Two Objects is Faster · Calculating Speed, Distance and Time · Uniform and Non-uniform Linear Motion

• Chapter 9: Life Processes in Animals

  15 questions, 2 with pictures · Digestion in Other Animals: Ruminants and Birds · Where Digestion Begins: Mouth, Food Pipe and Stomach · The Intestines: Where Food Is Digested, Absorbed and Finished With · How We Breathe: The Respiratory System and the Mechanism · Breathing in Other Animals: Gills, Skin and Different Lungs · Gas Exchange, and Why Breathing Is Not Respiration

• Chapter 10: Life Processes in Plants

  15 questions · What a Plant Needs in Order to Grow · What the Air Supplies and What the Plant Gives Back · Leaves, Chlorophyll and the Starch Test · Plants Respire Too, and Why That Is Not Photosynthesis Backwards · Photosynthesis in One Equation, and the Pores That Let the Gases Through · Transport: the Xylem Carries Water Up, the Phloem Carries Food Out

• Chapter 11: Light: Shadows and Reflections

  15 questions, 3 with pictures · Luminous and Non-Luminous Objects · Light Travels in a Straight Line · Transparent, Translucent and Opaque Materials · Shadow Formation · Reflection and the Image in a Plane Mirror · The Pinhole Camera, the Periscope and the Kaleidoscope

• Chapter 12: Earth, Moon and the Sun

  15 questions, 5 with pictures · The Apparent Motion of the Sun, the Moon and the Stars · Rotation of the Earth, and Day and Night · Revolution and the Changing View of the Night Sky · The Tilt of the Axis and the Seasons · Solar Eclipse · Lunar Eclipse