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14%20-%20Current%20Electricity

# 14%20-%20Current%20Electricity - 14 CURRENT ELECTRICITY...

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14 - CURRENT ELECTRICITY Page 1 ( Answers at the end of all questions ) 1 ) In the circuit, the galvanometer G shows zero deflection. If the batteries A and B have negligible internal resistance, the value of the resistor R will be ( a ) 100 ( b ) 200 ( c ) 1000 ( d ) 500 [ AIEEE 2005 ] 2 ) A moving coil galvanometer has 150 equal divisions. Its current sensitivity is 10 divisions per milliampere and voltage sensitivity is 2 divisions per millivolt. In order that each division reads 1 volt, the resistance in ohms needed to be connected in series with the coil will be ( a ) 10 5 ( b ) 10 3 ( c ) 9995 ( d ) 99995 [ AIEEE 2005 ] 3 ) Two sources of equal emf are connected to an external resistance R. The internal resistances of the two sources are R 1 and R 2 ( R 2 > R 1 ). If the potential difference across the source having internal resistance R 2 is zero, then ( a ) 1 R R R - 2 = ( b ) 1 2 2 1 2 R R R R R R - + × = ( c ) 1 2 2 1 R R R R R - = ( d ) 2 1 2 1 R R R R R + = [ AIEEE 2005 ] 4 ) In a potentiometer experiment the balancing with a cell is at 240 cm. On shunting the cell with a resistance of 2 , the balancing length becomes 120 cm. The internal resistance of the cell is ( a ) 0.5 ( b ) 1 ( c ) 2 ( d ) 4 [ AIEEE 2005 ] 5 ) The resistance of hot tungsten filament is about 10 times the cold resistance. What will be the resistance of 100 W and 200 V lamp when not in use ? ( a ) 20 ( b ) 40 ( c ) 200 ( d ) 400 [ AIEEE 2005 ] 6 ) An energy source will supply a constant current into the load if its internal resistance is ( a ) very large as compared to the load resistance ( b ) equal to the resistance of he load ( c ) non-zero but less than the resistance of the load ( d ) zero [ AIEEE 2005 ] 7 ) The total current supplied to the circuit by the battery is ( a ) 1 A ( b ) 2 A ( c ) 4 A ( d ) 6 A [ AIEEE 2004 ] 8 ) An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4 / 3 and 2 / 3, then the ratio of the currents passing through the wires will be ( a ) 3 ( b ) 1 / 3 ( c ) 8 / 9 ( d ) 2 [ AIEEE 2004 ] 9 ) The resistance of the series combination of two resistors is S. When they are joined in parallel, the total resistance is P. If S = nP, then the minimum possible value of n is ( a ) 4 ( b ) 3 ( c ) 2 ( d ) 1 [ AIEEE 2004 ]

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14 - CURRENT ELECTRICITY Page 2 ( Answers at the end of all questions ) 10 ) In a meter bridge experiment, null point is obtained at 20 cm from one end of the wire when resistance X is balanced against another resistance Y. If X < Y, then where will be the new position of the null point from the same end, if one decides to balance a resistance of 4X against Y ? ( a )
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14%20-%20Current%20Electricity - 14 CURRENT ELECTRICITY...

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