CBSE  /  Class 12  /  Physics  /  Current Electricity

  • 1. 
    The speed at which tjie current travels in a conductor is nearly:

  • 3 × 104 ms-1
  • 3 × 106 ms-1
  • 3 × 108 ms-1
  • 3 × 1010 ms-1

  • 2. 
    The resistance of a human body is about:

  • 12 Ω
  • 120 Ω
  • 12 KΩ
  • 120 MΩ

  • 3. 
    The number of electrons that constitute 1 A of current is:

  • 6.25 × 1016
  • 6.25 × 1017
  • 6.25 × 1018
  • 6.25 × 1019

  • 4. 
    How many different resistances are possible with two equal resistors?

  • 2
  • 3
  • 4
  • 5

  • 5. 
    Given three equal resistors, how many different combinations (taken all of them together) can be made?

  • 3
  • 4
  • 5
  • 6

  • 6. 
    Specific resistance of ali metals is mostly affected by:

  • temperature
  • pressure
  • magnetic field
  • volume

  • 7. 
    The example of a non-ohmic resistance is:

  • copper wire
  • fi lament lamp
  • carbon resistor
  • diode

  • 8. 
    If a certain piece of copper is to be shaped into a conductor of minimum resistance, its length (L) and cross-sectional area (a) shall respectively be :

  • L, 2A
  • \(\frac{L}{2}\), 2A
  • 2L, 2A
  • 2l, \(\frac{A}{2\)

  • 9. 
    The specific resistance of a rod of copper as compared to that of thin wire of copper is :

  • less
  • more
  • same
  • depends upon the length and area of cross-section of the wire

  • 10. 
    A wire of resistance 3 Ω is cut into three pieces, which are then joined to form a triangle. The equivalent resistance between any corners of the triangle is :

  • \(\frac{2}{3}\) Ω
  • \(\frac{3}{2}\) Ω
  • \(\frac{1}{2}\) Ω
  • \(\frac{1}{3}\) Ω
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