CBSE  /  Class 12  /  Physics  /  Current Electricity

  • 1. 
    The length of a conductor is halved. Its resistance will be :

  • halved
  • doubled
  • unchanged
  • quadrupled

  • 2. 
    In the above question, the conductance:

  • halved
  • doubled
  • unchanged
  • quadrupled

  • 3. 
    Siemen is the unit of:

  • resistance
  • conductance
  • specific conductance
  • None of these

  • 4. 
    How much electric energy is consumed by a 100 W lamp used for 6 hours everyday for 30 days?

  • 18 kJ
  • 18 kWh
  • 1.8 J
  • None of these

  • 5. 
    Suppose H1 is the heat generated per second in the filament of a 100 W, 250 V lamp and H2 is the heat generated in the filament of a 200 W, 250 V lamp. Then H1/H2 is equal to:

  • 1
  • 2
  • \(\frac{1}{2}\)
  • \(\frac{1}{4}\)

  • 6. 
    Two wires of copper are of the same length but'have different diameters. When they are connected in series across a battery, the heat generated is H1 When connected in parallel across the same battery, the heat generated during the same time is H2 Then :

  • H1 = H2
  • H1 < H2
  • H1 > H2
  • H1 > H2

  • 7. 
    In questions 135, w hen the wires are connected in series, the heat produced in the thinner wire is H1 and that in the thicker wire is H2. Then :

  • H1 = H2
  • H1 < H2
  • H1 > H2
  • H1 > H2

  • 8. 
    Kirchhoffs first and second laws for electrical circuits are consequences of:

  • conservation of energy
  • conservation of electrical charge and energy respectively
  • conservation of electric charge
  • neither conservation of energy nor electric charge

  • 9. 
    A 5 A fuse wire can with stand a maximum power of 1 W in circuit. The resistance of the fuse wire is:

  • 0.2 Ω
  • 5 Ω
  • 0.4 Ω
  • 0.04 Ω

  • 10. 
    The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:

  • resistance will be doubled and specific resistance will be halved
  • resistance will be halved and specific resistance will remain uncharged
  • resistance will be halved and the specific resistance will be doubled
  • resistance and specific resistance will both remain uncharged
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