Question 11 : The resistance of a wire is R. If the length of the wire is doubled by stretching, then the new resistance will be
1. R/4
2. R
3. 2R
4. 4R
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Question 12 : The resistance of 20 em long wire is 5 ohm. The wir~ is stretched to a uniform wire of 40 em length. The resistance now will be (in ohms)
1. 5
2. 20
3. 200
4. 10
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Question 13 : When cells are arranged in parallel
1. The current capacity increases
2. The emf increases
3. The current capacity decreases
4. The emf decreases
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Question 14 : Three resistances R, 2R and 3R are connected in parallel to a battery. Then
1. the heat developed in resistance 3R is maximum
2. The current through each resistance is same
3. The potential drop across resistance 2R is maximum
4. the heat developed in resistance R is maximum
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Question 15 : The lead wires should have
1. Smaller diameter and low resistance
2. Smaller diameter and high resistance
3. Larger diameter and low resistance
4. Larger diameter and high resistance
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Question 16 : A uniform wire of resistance 9 n is cut into 3 equal parts. They are connected in the form of equilateral triangle ABC. A cell of emf 2V anj negligible internal resistance is connected across B and C. Potential difference across AB is
1. 1 V
2. 3V
3. 2V
4. 0.5V
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Question 17 : A 6 volt battery is connected to the terminals of a three metre long wire of uniform thickness and resistance of 100 ohm. The difference of potential between two points on the wire separated by a distance of 50 em will be
1. 2 Volt
2. 3 Volt
3. 1 Volt
4. 1.5 Volt
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Question 18 : The internal resistance of a cell is the resistance of
1. Vessel of the cell
2. Electrolyte used in the cell
3. Electrodes of the cell
4. Material used in the cell
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Question 19 : If an ammeter is to be used in place of a voltmeter the we must connect with the ammeter a
1. Low resistance in parallel
2. High resistance in series
3. High resistance in parallel
4. Low resistance in series
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Question 20 : When a piece of aluminium wire finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become
1. 2 times
2. 8 times
3. 16 times
4. 4 times
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