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Science Questions & Answers What type of image is formed by a plane mirror? What is the focal length of the plane mirror? Name the essential part of human eye. What is meant by accommodation of eye? State Snell’s law

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Q. 1.What type of image is formed by a plane mirror?Q. 2.What is the focal length of the plane mirror?Q. 3.What type of lens does a drop of water behave like?Q. 4.Name the essential part of human eye.Q. 5.A concave mirror produces three times enlarged image of an object placed at 10 cm in front of it. Calculate the radius of curvature of the mirror.Q. 6.Why does the cord of an electric heater not glow while the heating element does?Q. 7.What is meant by accommodation of eye?Q. 8.What is the SI unit of power?Q. 9.How many images are formed by two parallel mirrors?Q. 10.Check the following statements, write true or falsea. Like magnetic poles attract each other, unlike poles repel.b. If you strike a sharp edge of metallic knife against the north pole of a bar magnet, it will induce a north pole.c. The magnetic field produced by a current in a straight wire has no poles.d. An electric generator is a device that converts electrical energy into mechanical energy.Q. 11.Where an object should be placed in front of a convex lens to get a real image of the size of the object?Q. 12.Light enters from air to glass having refractive index 1.50. What is the speed of light in the glass? The speed of light in vacuum is 3 108 m s1.Q. 13.Define electrostatic potential at a point.Q. 14How are a voltmeter and an ammeter connected in circuit?Q. 15.Name a device that helps to maintain a potential difference across a conductor.Section BQ. 1

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