Current Electricity

101. Which of the following statement is true both for a series and a parallel D.C. circuit?

1. Elements have individual currents
2. Currents are additive
3. Voltages are additive
4. Power are additive

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102. Which of the following statement is true?

1. A galvanometer with low resistance in parallel is a voltmeter
2. A galvanometer with high resistance in parallel is a voltmeter
3. A galvanometer with low resistance in series is an ammeter
4. A galvanometer with high resistance in series is an ammeter

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103. Which one of the following does not have negative temperature co-efficient?

1. Aluminium
2. Paper
3. Rubber
4. Mica

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104. With rise in temperature the resistance of pure metals

1. increases
2. decreases
3. first increases and then decreases
4. remains constant

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105. With rise in temperature the resistance of semi-conductors

1. decreases
2. increases
3. first increases and then decreases
4. remains constant

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106. With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

1. 10 W
2. 20 W
3. 40 W
4. 60 W

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107. You have to replace 1500 Q resistor in radio. You have no 1500 Q resistor but have several 1000 Q ones which you would connect

1. two in parallel
2. two in parallel and one in series
3. three in parallel
4. three in series

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