| 1. | Which of the following lamps will have least resistance at room temperature ? | |
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26W, 220 V
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100W, 220 V
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200 W, 220 V
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60 W, 220 V
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Report Question| 2. | Copper wire of certain length and resistance is drawn out to three times its length without change in volume, the new resistance of wire becomes ? | |
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1/9 times
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3 times
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9 times
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unchanged
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| 3. | Three 60 W bulbs are in parallel across the 60 V power line. If one bulb burns open ? | |
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there will be heavy current in the main line
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rest of the two bulbs will not light
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all three bulbs will light
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the other two bulbs will light
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| 4. | 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 ? | |
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6.4 A, 6.9 A
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4.6 A, 6.9 A
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6.4 A, 9.6 A
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4.6 A, 9.6 A
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| 5. | The property of a conductor due to which it passes current is called ? | |
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resistance
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reluctance
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conductance
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inductance
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| 6. | The SI unit of power is ? | |
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henry
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coulomb
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watt
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watt-hour
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| 7. | The four bulbs of 40 W each are connected in series with a battery across them, which of the following statement is true ? | |
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The current through each bulb in same
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The voltage across each bulb is not same
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The power dissipation in each bulb is not same
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None of the above
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| 8. | Resistance of a tungsten lamp ...... as applied voltage increases ? | |
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decreases
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increases
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remains same
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none of the above
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| 9. | Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be ? | |
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160 ohms
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80 ohms
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20 ohms
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10 ohms
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| 10. | If a parallel circuit is opened in the main line, the current ? | |
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increases in the branch of the lowest resistance
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increases in each branch
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is zero in all branches
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is zero in the highest resistive branch
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