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The electrical resistivities of four mat...

The electrical resistivities of four materials A, B, C and D are given below:
` A : 110 xx 10^(-8) Omega m`
`B : 1.0 xx 10^10 Omega m`
`C : 10.0 xx 10^(-8) Omegam`
`D : 2.3 xx 10^3 Omega m`
Which material is a (a) good conductor (b) resistor (c) insulator (d) semi-conductor?

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(a)C, (b)A, (c)B, (d)D
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KUMAR PRAKASHAN-ELECTRICITY-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions as directed (Miscellaneous):)
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  2. A current of 200 mA flows through a 4 kOhm resistor. What is the poten...

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  3. The electrical resistivities of four materials A, B, C and D are given...

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  4. The equivalent resistance of a series combination of two resistors is ...

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  5. An electric lamp is labelled 12 V, 36 W. This indicate that it should ...

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  6. Name two devices whose working is based on the heating effect of elect...

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  7. Name the gases which are filled into the filament-type electric light ...

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  8. Why are the filament-type electric light bulbs not power efficient?

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  9. Under what conditions is the Ohm.s law applicable?

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  10. Why is Nichrome used as a heating element?

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  11. Why are Constantan and Manganin used for making standard resistors?

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  12. Why is lead-tin alloy used for making a fuse?

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  13. What is the difference between a resistor ~ and resistance?

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  14. What do you mean by the term load in an electric circuit?

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  15. How does the current divide itself in a parallel combination of resist...

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  16. How does the potential difference divide itself in a series combinatio...

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  17. How is heat produced in a conductor by an electric current?

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  18. If a number of bulbs of different wattages are joined in parallel With...

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  19. Which bulb will glow With maximum brightness in case bulbs of differen...

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  20. What can you say about the resistance of an ammeter?

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