1) Find the equivalent capacitance between A and B in the combination given below. Each capacitor has a capacitance of 2µF. a) 10 x 10 -6 F b) 6 x 10 -6 F c) 4x 10 -6 F d) 12x 10 -6 F 2) The physical quantity with the unit ampere/metre2 a) Drift velocity b) Mobility c) Current density d) Relaxation time 3) The relation between mobility and electric field is a) vd x E b) vd + E c) E - vd d) vd/E 4) A set of n equal resistors, of value R each are connected in series to a battery of emf E and internal resistance R. The current drawn is I. Now, the ‘n’ resistors are connected in parallel to the same battery. Then the current drawn from battery becomes 10 I. Find the value of n? a) 4 b) 6 c) 5 d) 10 5) Find the equivalent resistance between the point A and B of the network as shown in the figure. a) 6.2Ω, 1.5Ω b) 8.8Ω, 3.5Ω c) 4.8Ω, 2.5Ω d) 5.8Ω, 0.5Ω 6) At what temperature will the resistance of a copper wire become three times its value at 0oC (Temperature coefficient of resistance for copper = 4 × 10–3 per oC ) a) 450 oC b) 500 oC c) 400 oC d) 550 oC 7) The terminal potential difference of a cell when short-circuited is (E = E.M.F. of the cell) a) E b) E/2 c) 0 d) E/3 8) The reading of a high resistance voltmeter when a cell is connected across it is 2.2 V. When the terminals of the cell are also connected to a resistance of  5 the voltmeter reading drops to 1.8 V. Find the internal resistance of the cell. a) 1.1 ohm b) 0.5 ohm c) 2.5 ohm d) 2 ohm 9) A torch battery consisting of two cells of 1.45V and an internal resistance  15.0 , each cell sending currents through the filament of the lamps having resistance 1.5Ω. Find the value of current. a) 6.6 A b) 7.2 A c) 3 A d) 1.61 A 10) KCL is based on the fact that a) There is a possibility for a node to store energy. b) There cannot be an accumulation of charge at a node. c) Charge accumulation is possible at node d) Charge accumulation may or may not be possible. 11) For the circuit diagram shown below, calculate the potential difference between the point B and D a) 7/13 A b) 6/8A c) 6/13 A d) 13/7 A 12) Resistances R1 and R2 are connected respectively in the left gap and right gap of a metre bridge. If the balance point is located at 55 cm from left, the ratio R2/R1 is a) 4/5 b) 5/4 c) 9/11 d) 11/9 13) An unknown resistance X is connected in the left gap and known resistance R is connected in the right gap of a metre bridge. The balance point is obtained at 60 cm from the left end of wire. When R is increased by 2 ohm the balance point shifts 10 cm. Find X and R. a) X = 6 ohm,  R = 4 ohm b) X = 8 ohm, R = 6 ohm c) X = 3ohm, R = 5 ohm d) X = 10 ohm, R = 14 ohm 14) What is the colour code of 33kΩ, ± 5% resistor? a) Orange, Orange, Red, Gold b) Orange, blue, Orange, silver c) Orange, Orange, Gold d) Orange, Orange, Orange, Gold 15) With a certain cell the balance point is obtained at 0.60 m from one end of the potentiometer. With another cell whose emf differs from that of the first by 0.1 V, the balance point is obtained at 0.55 m , find the two emf’s . a) E1=2.2 V; E2 =3.1 V b) E1=0.2 V; E2 =1.8 V c) E1=5.2 V; E2 =6.1 V d) E1=1.2 V; E2 =1.1 V

Current Electricity _Test

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