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1) What is the SI unit of electric current?
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2) The advantage of AC over DC is that
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3) A veena player compares with a tuning fork the fundamental frequency generated by one of the strings of the veena and hears 4 beats per second. He then tightens the string a bit and hears only 3 beats per second. Then
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4) For a given liquid, the rate of evaporation depends on 1.the temperature of the liquid 2.the temperature of air 3.the surface area of the liquid Which of the above factors is/are correct?
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5) Cathode rays were discovered by
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6) Diamonds are glittering and attractive because light incident on them undergoes
Explanation:
Diamond has remarkable optical characteristics. Because of its extremely rigid lattice, it can be contaminated by very few types of impurities, such as boron and nitrogen. Combined with wide transparency, this results in the clear, colourless appearance of most natural diamonds. Small amounts of defects or impurities (about one per million of lattice atoms) colour diamond blue (boron), yellow (nitrogen), brown (lattice defects), green (radiation exposure), purple, pink, orange or red. Diamond also has relatively high optical dispersion (ability to disperse light of different colours), which results in its characteristic luster. Excellent optical and mechanical properties, combined with efficient marketing, make diamond the most popular gemstone.
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7) The function of the choke is to
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8) The rate of flow of electric charge is measured in
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9) A device which is used to limit the current in an electrical circuit is called a
Explanation:
A fuse places a limit on the amount of current that can be drawn by an electric circuit by opening (blowing or melting) when the current exceeds a preset limit. This protects the circuit and the surroundings from fire or damage in the case of an overload or short circuit.
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10) Materials that allow electricity to flow are called
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