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In a voltmeter there are 20 divisions ...

In a voltmeter there are 20 divisions between 0 mark and 0.5 V mark. Calculate the least count of the voltmeter.

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Range of voltmeter = 0.5 V
No. of divisions = 20
`:.` The least count of the voltmeter
`=("Range")/("Total no.of divisions") =(0.5V)/(20) = 0.025V`
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KUMAR PRAKASHAN-ELECTRICITY-OBJECTIVE QUESTIONS AND ANSWERS (Answer the following questions as directed (Miscellaneous):)
  1. How does the resistance (R) of a wire depend upon its radius (r)?

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  2. An ammeter has a range (0 - 3A) and there are 30 divisions on its scal...

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  3. In a voltmeter there are 20 divisions between 0 mark and 0.5 V mark....

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  4. To verify the Ohm.s law a circuit diagram was drawn by a student as sh...

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  5. Four students connect 4 cells of 1.5 V each to get a battery of voltag...

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  6. Which of the following statements is correct? (a) one volt is one j...

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  7. Keeping the resistance constant, the potential difference applied acro...

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  8. Keeping the potential difference constant, the resistance of a circuit...

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  9. A potential difference of 10 V is needed to make a current of 0.02 A f...

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  10. A current of 200 mA flows through a 4 kOhm resistor. What is the poten...

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

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

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

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

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

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

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

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  18. Why is Nichrome used as a heating element?

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

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

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