| 1. | Four cells each of e.m.f E are joined in parallel to form a battery. The equivalent e.m.f of the battery will be ? | |
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E = 0
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E / 4
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E
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4 E
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Report Question| 2. | If the resistance of a certain copper wire is 1 ohm, then the resistance of a similar nichrome wire will be about ? | |
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60 ohm
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45 ohm
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30 ohm
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25 ohm
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| 3. | The resistivity of insulators is of the order of ? | |
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10^6 ohm-m
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10^-8 ohm-m
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10^-6 ohm-m
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10^1 ohm-m
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| 4. | To get 2 ohm resistance using only 6 ohm resistors, the number of them required is ? | |
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6
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4
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3
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2
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| 5. | In an electrical circuit two resistors of 2 ohm and 4 ohm respectively are connected in series to a 6 V battery. The heat dissipated by the 4 ohm resistor in 5 s will be ? | |
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30 J
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10 J
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5 J
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20 J
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| 6. | choose the incorrect statement ? | |
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The heating element of electric iron is made of nichrome wire which is an insulator.
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Those substance which have very low electrical resistance are called good conductors.
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Those substances which have comparatively high electrical resistance, are called resistors.
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Those substances which have infinitely high electrical resistance are called insulators.
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| 7. | Joule/Coulomb is same as ? | |
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Watt
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Volt
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Ohm
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Ampere
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| 8. | Ohms law relates potential difference with ? | |
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Energy
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Power
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Current
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Time
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| 9. | Electric power is inversely proportional to ? | |
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temperature
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current
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voltage
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resistance
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| 10. | A battery of 10 volt carries 20,000 C of charge through a resistance of 20 ohm. The work done in 10 seconds is ? | |
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2 × 10^2 joule
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2 × 10^4 joule
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2 × 10^3 joule
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2 × 10^5 joule
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