CBSE  /  Class 12  /  Physics  /  Current Electricity

  • 1. 
    A galvanometer acting as a volt meter will have with its coil.

  • a high resistance in parallel
  • a high resistance in series
  • a low resistance in parallel
  • a low resistance in series

  • 2. 
    When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be:

  • 20 W
  • 60 W
  • 180 W
  • 10 W

  • 3. 
    n resistances, each of R Ω, are connected in parallel gives an equivalent resistance of R Ω. If these resistances were , connected in series, the combination would have a resistance in Ω is equal to

  • n²R
  • R/n²
  • R/n
  • nR

  • 4. 
    Why is the Wheatstone bridge more accurate than other methods of measuring resistances:

  • It is a null method
  • It is based on Kirchhoffs laws
  • It has four resistances
  • It does not involve ohm's law

  • 5. 
    A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :

  • 20 A
  • 5 A
  • 0.2 A
  • None of these

  • 6. 
    Ohm's law is valid when the temperature of conductor is :

  • very low
  • very high
  • varying
  • constant

  • 7. 
    The emf of a car battery is about:

  • 2.5 V
  • 4.5 V
  • 8.6 V
  • 12 V

  • 8. 
    Emf is measured in :

  • joule
  • joule/coulomb
  • joule-coulombs
  • joule/coulomb/metre

  • 9. 
    1 kilowatt hour is commonly known as :

  • unit
  • 1 faraday
  • 1 curie
  • None of these

  • 10. 
    How many joules are equal to I kWh?

  • 3.6 × 104
  • 3.6 × 105
  • 3.6 × 106
  • None of these
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