CBSE - Class 08 - Science

Online test Crop Production and Management: How are different food crops produced? What are the various foods we get from animal sources? Crop production: Soil preparation, selection of seeds, sowing, applying fertilizers, irrigation, weeding, harvesting and storage; nitrogen fixation, nitrogen cycle.

Online test Microorganisms Friend And Foe: What living organisms do we see under a microscope in a drop of water? What helps make curd? How does food go bad? How do we preserve food?

Online test Synthetic Fibres and Plastics: Are some of our clothes synthetic? How are they made? Where do the raw materials come from? Do we use other materials that are synthetic? Do we use cloth (fabric) for purposes other than making clothes to wear? What kind of fabric do we see around us? What are they used for?

Materials Metals and Non Metals: Can a wire be drawn out of wood? Do copper or aluminium also rust like iron? What is the black material inside a pencil? Why are electrical wires made of aluminium or copper?

Online test Coal and Petroleum: What do we do with coal and petroleum? Can we create coal and petroleum artificially? Consequences of over extraction of coal and petroleum.

Online test Combustion and Flame: What happens to the wax when a candle is burnt? Is it possible to get this wax back? What happens to kerosene/natural gas when it is burnt? Which fuel is the best? Why?

Online test Conservation of Plants and Animals: What are reserve forests/sanctuaries etc? How do we keep track of our plants and animals? How do we know that some species are in danger of disappearing? What would happen if you continuously cut trees?

Online test Cell Structure and Functions: What is the internal structure of a plant – what will we see if we look under the microscope? Which cells from our bodies can be easily seen? Are all cells similar?

Online test Reproduction in Animals: Do all animals give birth to young ones? Sexual reproduction and endocrine system in animals, secondary sexual characters, reproductive health; internal and external fertilisation.

Online test Reaching the Age of Adolescence: How do babies develop inside the mother? Why does our body change when we reach our teens? How is the sex of the child determined? Who looks after the babies in your homes?

Online test Force and Pressure: What happens when we push or pull anything? How can we change the speed, direction of a moving object? How can we shape the shape of an object? Why are needles made pointed? Why does a balloon burst if too much air is blown into it? Why does an inverted glass/bottle/pitcher resist being pushed down into water? How can air/liquids exert pressure?

Online test Friction: What makes a ball rolling on the ground slow down? Friction – factors affecting friction, sliding and rolling friction, moving; advantages and disadvantages of friction for the movement of automobiles, airplanes and boats/ships; increasing and reducing friction.

Online test Sound: How do we communicate through sound? How is sound produced? What characterises different sounds? Various types of sound; sources of sound; vibration as a cause of sound; frequency; medium for propagation of sound; idea of noise as unpleasant and unwanted sound and need to minimise noise.

Online test Chemical Effects of Electric Current:Why do we get a shock when we touch an electric appliance with wet hands? What happens to a conducting solution when electric current flows through it? How can we coat an object with a layer of metal?

Online test Some Natural Phenomena: Rain, thunder and lightning What is lightning? What safety measures should we take against lightning strikes? Clouds carry electric charge. Positive and negative charges, attraction and repulsion. Principle of lightning conductor.

Online test Light: What are the differences between the images formed on a new utensil and an old one? Why is there this difference? When you see your image in the mirror it appears as if the left is on the right – why? Why don’t we see images on all surfaces around us? What makes things visible?

Online test Stars and the Solar System: What do we see in the sky at night? How can we identify stars and planets? Idea about heavenly bodies/celestial objects and their classification – moon, planets, stars, constellations. Motion of celestial objects in space; the solar system.

Online test Pollution of Air and Water: What are the various activities by human beings that make air impure? Does clear, transparent water indicate purity? Water and air are increasingly getting polluted and therefore become scarce for use.