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 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?
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 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.