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Four alternatives are given for each of the following questions. Choose the correctalternative and write the complete answer along with its letter of alphabet. 3x11. The device used to measure the current isa) galvanometer b) ammeter c) voltmeter d) rheostat2. Which of the following is not a characteristic of magnetic lines of force?a) emerge from North poleb) intersect each otherc) merge in South poled) do not intersect each other3. Which type of lens you prefer to use in reading small words in newspapea) concave lens with focal length 50 cmb) convex lens with focal length 50 cmc) concave lens with focal length 5cmd) convex lens with focal length 5 cmAnswer the following questions:4. Power of a lens is 2 diopter. What does it mean?5. In which point of a lens the light ray do not bend?Answer the following questions:6. On what factors did the resistance of a conductor depends?7. Draw a ray diagram of image formed when an object is placed beyfront of a concave lens8. Compare the power used in in each of the following;a) 6-volt battery in series with 1 ohm and 2-ohm resistorsb)4-volt battery in parallel with 12 ohm and 2-ohm resistAnswer the following questions:9. Draw a neat diagram of electric motor and label carbon brusheulnin neyneriment to show convex lens converges light rIV. |
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Answer» Explanation: 1. The device used to measure the current is a) galvanometer. 2. Which of the following is not a characteristic of magnetic lines of force? a) EMERGE from North pole b) intersect each other c) merge in South pole d) do not intersect each other 3. Which type of lens you prefer to USE in reading small words in NEWSPAPER* ( prevalent spelling error) a) concave lens with focal length 50 cm b) convex lens with focal length 50 cm c) concave lens with focal length 5cm d) convex lens with focal length 5 cm 4. Power of a lens is 2 DIOPTER. This means that the focal length of the lens is 1/2 metres. 5. The light ray does not bend when it passes through optical center of the lens. 6. Resistance of conductor depends on the Resistivity, length of the conductor and the area if the conductor. 8. a)Voltage = 6V Resistance = 1+2 = 3A Power = V²/R = 12W b) Resistance = (1/12 + 1/2)'s Reciprocal = 12/7 Ohm 4²/(12/7) = 9.33 W |
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