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1) Electric pressure is also called________? a. resistance b. power c. voltage d. energy
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2) The substances which have a large number of free electrons and offer a low resistance are called____? a. insulators b. inductors c. semi-conductors d. conductors
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3) Out of the following which is not a poor conductor__________? a. Cast iron b. Copper c. Carbon d. Tungsten
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4) Out of the following which is an insulating material____________? a. Copper b. Gold c. Silver d. Paper
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5) The property of a conductor due to which it passes current is called___________? a. resistance b. reluctance c. conductance d. inductance
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6) Conductance is reciprocal of____________? a. resistance b. inductance c. reluctance d. capacitance
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7) The resistance of a conductor varies inversely as___________? a. length b. area of cross-section c. temperature d. resistivity
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8) With rise in temperature the resistance of pure metals______________? a. increases b. decreases c. first increases and then decreases d. remains constant
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9) With rise in temperature the resistance of semi-conductors_________________? a. decreases b. increases c. first increases and then decreases d. remains constant
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10) The resistance of a copper wire 200 m long is 21 Q. If its thickness (diameter) is 0.44 mm, its specific resistance is around_______________? a. 1.2 x 10~8 Q-m b. 1.4 x 10~8 Q-m c. 1.6 x 10″”8 Q-m d. 1.8 x 10″8 Q-m
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11) An instrument which detects electric current is known as_____________? a. voltmeter b. rheostat c. wattmeter d. galvanometer
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12) In a circuit a 33 Q resistor carries a current of 2 A. The voltage across the resistor is a. 33 V b. 66 v c. 80 V d. 132 V
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13) A light bulb draws 300 mA when the voltage across it is 240 V. The resistance of the light bulb is___________? a. 400 Q b. 600 Q c. 800 Q d. 1000 Q
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14) The resistance of a parallel circuit consisting of two branches is 12 ohms. If the resistance of one branch is 18 ohms, what is the resistance of the other ? a. 18 Q b. 36 Q c. 48 Q d. 64 Q
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15) Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 25 Q. If the same four wires are connected is series the effective resistance will be________? a. 100 Ω b. 200 Ω c. 300 Ω d. 400 Ω
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16) A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is_____________? a. 6.4 A, 6.9 A b. 6.4 A, 9.6 A c. 4.6 A, 6.9 A d. 4.6 A, 9.6 A
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17) Current velocity through a copper conductor is___________? a. the same as propagation velocity of electric energy b. independent of current strength c. of the order of a few ^.s/m d. nearly 3 x 108 m/s
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18) Which of the following material has nearly zero temperature co-efficient of resistance_________? a. Manganin b. Porcelain c. Carbon d. Copper
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19) 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__________? a. two in parallel b. two in parallel and one in series c. three in parallel d. three in series
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20) Two resistors are said to be connected in series when___________? a. same current passes in turn through both b. both carry the same value of current c. total current equals the sum of branch currents d. sum of IR drops equals the applied e.m.f.
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