CBSE  /  Class 12  /  Physics  /  Electrostatic Potential and Capacitance

  • 1. 
    The dimensions of fall of potential per unit distance are given by:

  • [MLT-3 A-1]
  • [ML2T-2A-1]
  • [ML2T-2A-3]
  • [MLT-2A-2]

  • 2. 
    Which of the following is blocked by a capacitor?

  • A.C.
  • D.C.
  • Both A.C. and D.C.
  • Neither A.C. nor D. C

  • 3. 
    Two copper spheres of the same radius, one solid and the other hollow, are charged to the same potential. Which will have more charge?

  • Solid sphere
  • Hollow sphere
  • Both will have an equal charge
  • None of these

  • 4. 
    The capacitance of a capacitor will decrease if we introduce a slab of:

  • copper
  • aluminium
  • zinc
  • None of these

  • 5. 
    Two capacitors of capacitance 6 µF and 4 µF are put in series across a 120 V battery. What is the potential difference across the 4 µF capacitor?

  • 72 V
  • 60 V
  • 48 V
  • zero

  • 6. 
    In which of the following forms is the energy stored in a capacitor?

  • Charge
  • Potential
  • Capacitance
  • Electric field

  • 7. 
    Two conducting spheres of radii r1 and r2 are equally charged. The ratio of their potential is

  • (r1/r2)²
  • (r1r2)²
  • (r1/r2)
  • (r2/r1)

  • 8. 
    Twenty seven drops of mercury are charged simultaneously to the same potential of 10 volts. What will be potential if all the charged drops are made to combine to form one large drop?

  • 180 V
  • 90 V
  • 120 V
  • 45 V

  • 9. 
    The P.E. of an electric dipole is maximum when it makes an angle θ with electric field. The value of θ is :

  • \(\frac{π}{2}\)
  • π
  • zero
  • \(\frac{3π}{2}\)

  • 10. 
    The amount of work required to increase the distance between -6µC and 4µC from 6 cm to 18 cm will be :

  • 1.8 J
  • 2.4 J
  • 1.8 µJ
  • 2.4 µJ
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