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{"ops":[{"insert":"Draw a circuit diagram which consists of the following components:\n2 batteries in parallel \nAn open switch\n2 resistors in parallel\nAn ammeter measuring total current\nA voltmeter measuring potential difference across one of the parallel resistors\n\nList 5 properties of a virtual image created by reflection from a plane mirror. \n\nWhat angle does the principal axis make with a plane mirror?\n\nIs the principal axis a normal to the surface of the plane mirror?\n\nDo the reflected rays that contribute to forming the image from a plane mirror obey the law of reflection?\n\nIf a candle is placed 50 cm in front of a plane mirror, how far behind the plane mirror will the image be? Draw a ray diagram to show how the image is formed\n\nExplain why ambulances have the word \u2018ambulance\u2019 reversed on the front bonnet of the car?\n\nIf a stool 0.5 m high is placed 2 m in front of a plane mirror, how far behind the plane mirror will the image be and how high will the image be?\n\nIf Susan stands 3 m in front of a plane mirror, how far from Susan will her image be located?\n\nA dental technician uses a small mirror that gives a magnification of 4.0 when it is held 0.60cm from a tooth. What is the radius of the curvature of the mirror?\n\nAn object 2 cm high is placed 4 cm from a convex mirror. If the focal length of the mirror is 4 cm, find the position and size of the image by means of a ray diagram. Is the image real or virtual? Calculate the magnification.\n\nAn object 1 cm high is placed 4 cm from a concave mirror. If the focal length of the mirror is 2 cm, find the position and size of the image by means of a ray diagram. Is the image real or virtual? Calculate the magnification.\n\nA semi-conductor is formed by \u2026\u2026\u2026 bonds\na. Covalent \nb. Electrovalent\nc. Co-ordinate\nd. None of the above \n\nThe most commonly used semi-conductor is......\na. Germanium\nb. Silicon \nc. Carbon \nd. Sulphur \n\nDifferentiate semi-conductor,conductor and insulators on basis of band gap.\n\n\nIs a hole a fundamental particle in an atom .\n\n\nDefine a hole in a semi-conductor .\n\n\nWhy silicon and germanium are the two widely used semi-conductor materials?\n\n\nExplain how watches can be considered as an electronic device.\n\n\nList at least 8 electronic devices that are used at school.\n\nYou are provided with three electric components namely: one ordinary Dione, one resistor,one dry cell and connecting wires. Use the symbols of these elements to draw a complete electric circuit such that the ordinary diode is forward biased.\n"}]}

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