| 1. | International ohm is defined in terms of the resistance of ? | |
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a column of mercury
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a cube of carbon
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a cube of copper
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the unit length of wire
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Report Question| 2. | Voltage dependent resistors are usually made from ? | |
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charcoal
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silicon carbide
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nichrome
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graphite
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| 3. | Which of the following quantities remain the same in all parts of a series circuit ? | |
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Voltage
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Current
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Power
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Resistance
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| 4. | A nichrome wire used as a heater coil has the resistance of 2 ?/m. For a heater of 1 kW at 200 V, the length of wire required will be ? | |
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80 m
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40 m
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60 m
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20 m
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| 5. | Ohm's law is not applicable to ? | |
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semi-conductors
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D.C. circuits
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small resistors
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high currents
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| 6. | All good conductors have high ? | |
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conductance
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resistance
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reluctance
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thermal conductivity
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| 7. | In a lamp load when more than one lamp are switched on the total resistance of the load ? | |
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increases
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decreases
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remains same
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none of the above
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| 8. | When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests that the type of supply is ? | |
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A.C.
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D.C.
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any of above two
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none of the above
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| 9. | The weight of an aluminium conductor as compared to a copper conductor of identical cross-section, for the same electrical resistance, is ? | |
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50%
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60%
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100%
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150%
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| 10. | The condition for the validity under Ohm's law is that ? | |
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resistance must be uniform
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current should be proportional to the size of the resistance
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resistance must be wire wound type
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temperature at positive end should be more than the temperature at negative end
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