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The rings on carbon resistance have colo...

The rings on carbon resistance have colours in the sequence Red,Yellow, Violet and Silver.Then resistance is :

A

`24 x 10^7 +- 10%`

B

`42 xx 105 +- 10%`

C

`68 xx 104+- 10%`

D

`37 xx 10^2+- 5%`

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PUNJAB BOARD PREVIOUS YEAR PAPERS-Electric Current, Resistance and E.M.F. -Exercise
  1. One kilowatt hour is equal to

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  2. Which out of the following is used to make standard resistance

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  3. The rings on carbon resistance have colours in the sequence Red,Yellow...

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  4. With increase in temperature, resistance of metals :

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  5. For alloys the value of temperature coefficient of resistance is very ...

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  6. For metallic conductors the value of temperature coefficient of resist...

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  7. S.l. unit of electromotive force is volt. (True/False)

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  8. On what factor does the internal resistance of a cell depends?

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  9. With the help of a diagram derive the formula for the equivalent resis...

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  10. What is the internal resistance of a cell ? How it can be measured ?

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  11. What is Non-ohmic device ? Give one example.

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  12. What is a drift velocity ? Establish the relations between the drift v...

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  13. If drift velocity of electron as well as charge on electron is very sm...

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  14. Define internal resistance of a cell and find an expression for it.

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  15. Establish the relation between drift velocity of electrons and electri...

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  16. The number density of free electrons in a metal piece is a very large ...

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  17. Standard resistance coils are made up of which material why ?

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  18. What is the effect of the temperature on resistivity of metals

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  19. What is the effect of the temperature on resistivity of semiconductors...

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  20. Why connecting wires are made up of copper ?

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