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Q-3 B: (b) they have streamlined body shape.
Q-4 (A): Shadow is defined as either a dark part of something or to an area of complete darkness. An example of shadow is a dark or shaded area on a photograph. An example of shadow is a pitch dark alley from where a scary figure emerges. An example of shadow is a faithful dog that follows behind you all day.
Q-4 (B): This is because the direction of current is always from positive terminal to negative terminal of the cell or battery. This is the conventional direction of flow of current in the circuit. (b) Yes, the bulb will glow in both the cases because for the bulb to glow, we just need to complete the circuit.
Hope it clears your query.
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