Air Around Us Exercise: 1). What is the composition of air? Ans: Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapour, dust particles and a few other gases. 2). Which gas in the atmosphere is essential for respiration? Ans: Oxygen in the atmosphere is essential for respiration. 3). How will you prove that …
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Water Exercise: 1). Fill up the blanks in the following: (a) The process of changing of water into its vapour is called evaporation. (b) The process of changing water vapour into water is called condensation. (c) No rainfall for a year or more may lead to droughts in that region. (d) Excessive rains may cause …
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Electricity and Circuits Exercise: 1. Fill in the blanks : (a) A device that is used to break an electric circuit is called a switch. (b) An electric cell has two terminals. 2. Mark ‘True’ or ‘False’ for the following statements: (a) Electric current can flow through metals. True (b) Instead of metal wires, a …
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Light, Shadows and Reflections Exercise: 1). Rearrange the boxes given below to make a sentence that helps us understand opaque objects. 2). Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous: Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a …
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Motion and Measurement of Distances Exercise: 1). Give two examples each, of modes of transport used on land, water and air. Modes of transport on land: bus, train, truck, car. etc. Modes of transport on water: boat, ship, steamer. etc. Modes of transport on air: aeroplane, helicopter. etc. 2). Fill in the blanks: (i). One …
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Getting to Know Plants Exercise: 1). Correct the following statements and rewrite them in your notebook. a). Stem absorbs water and minerals from the soil. Root absorbs water and minerals from the soil. b). Leaves hold the plant upright. Root hold the plant upright. c). Roots conduct water to the leaves. …
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Changes Around Us Exercise: 1). To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed? Yes, this change can be reversed. 2). You accidentally dropped your favorite toy and broke it. This is a change you did not want. Can …
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Sorting Materials into Groups Exercise: 1). Name five objects which can be made from wood. Chair, table, plough, bullock cart and bed. 2). Select those objects from the following which shine Glass bowl, plastic toy, steel spoon, cotton shirt. Glass bowl and steel spoon are the …
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