Physics-DPP-2-Current Electricity

PHYSICS Topic: CURRENT ELECTRICITY Date: 1. Six equal resistances are connected between points P, Q and R as shown in the figure. Then the net resistance will be maximum between: (a) P and Q (b) Q and R (c) P and R (d) Any two points 2. In the adjoining circuit, the battery E1 has an emf of 12 V and zero internal resistance while the battery E has an emf of 2 V. If the galvanometer G reads zero, then the value of the resistance X in ohm is : (a) 10 (b) 100 (c) 500 (d) 200 3. In the following circuit, 5Ω resistor develops 45 J/s due to current flowing through it. The power developed per second across 12Ω resistor is : (a) 16 W (b) 192 W (c) 36 W (d) 64 W 4. The total current supplied to the circuit by the battery is : (a) 1 (b) 2 A (c) 4 A (d) 6 A 5. For the circuit shown in the figure, the equivalent resistance between A and B is : (a) 10Ω (b) 8Ω (c) 6Ω (d) 4Ω PHYSICS Topic: CURRENT ELECTRICITY Date: 6. In the given network of resistances, the effective resistance between A and B is : (a) 5 R 3 (b) 8 R 3 (c) 5 R (d) 8 R 7. Five identical resistors, each of value 1100  are connected to a 220 V battery as shown. The reading of the ideal ammeter A is : (a) 1/ 5 A (b) 2/ 5 A (c) 3 / 5 A (d) 4 / 5 A 8. In the network shown, the equivalent resistance between A and B is : (a) 4  (b) 3   3 4 (c) 24  (d) 17   17 24 9. In the given circuit, the resistances are given in ohm. The current through the 10  resistance is 3 A while that through the resistance X is 1 A. No current passes through the galvanometer. The values of the unknown resistances X and Y are respectively (in ohm): (a) 14 and 54 (b) 12 and 6 (c) 6 and 12 (d) 6 and 6 10. A battery of internal resistance 4  is connected to the network of resistances as shown. In order to give the maximum power to the network, the value of R in  should be : (a) 4 / 9 (b) 8 / 9 (c) 2 (d) 18 PHYSICS Topic: CURRENT ELECTRICITY Date: Answer Key 1. (a) 2. (b) 3. (b) 4. (c) 5. (d) 6. (a) 7. (c) 8. (a) 9. (d) 10. (c)

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