CBSE  /  Class 12  /  Physics  /  Electrostatic Potential and Capacitance

  • 1. 
    An electron initially at rest is accelerated through a potential difference of one volt. The energy gained by electron is:

  • 1 J
  • 1.6 × 10-19 J
  • 10-19 J
  • None of these

  • 2. 
    A bird sitting on a high power line:

  • gets killed instantly
  • gets a mild shock
  • gets a fatal shock
  • is not affected practically

  • 3. 
    Choose the SI unit of electric potential energy :

  • Joule
  • Coulomb
  • Netwon per coulomb
  • Erg

  • 4. 
    The capacitance of earth, viewed as a spherical conductor of radius 6408 km is:

  • 1420 µF
  • 712 µF
  • 680 µF
  • 540 µF

  • 5. 
    A capacitor is connected to a cell of emf E having some internal resistance r, the potential across the:

  • cell is < E
  • cell is E
  • cell is > E
  • capacitor is E

  • 6. 
    If a +ve charge is moved from low to high potential region, the electric potential energy:

  • decreases
  • increases
  • remain the same
  • may increase or decrease

  • 7. 
    A capacitor is connected across a battery and the plate separation of capacitor is increased without removing the battery, then:

  • capacitance will increase
  • charge stored will increase
  • energy stored will decrease
  • potential difference will increase

  • 8. 
    Two capacitors of 3 µF and 6 µF are connected in series with a battery of P.d. 12 V. The P.d. across 3µF and 6µF capacitors respectively will be :

  • 8 V, 4 V
  • 6 V, 6 V
  • 4 V, 8 V
  • 9 V, 3 V

  • 9. 
    An electric charge of 425 f µC is removed from a fully charged capacitor of capacitance 8.5µF. Its potential will be lowered by:

  • 75 V
  • 100 V
  • 85 V
  • 50 V

  • 10. 
    Minimum number of capacitor of 2µF each required to obtain a capacitance of 5µF will be:

  • 4
  • 3
  • 5
  • 6
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