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Current Electricity Test - 79
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Current Electricity Test - 79

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  • Question 1/10
    4 / -1
    When a piece of aluminum wire of finite length is drawn through a series of dies to reduce its diameter to half its original value, its resistance will become
    Solutions

  • Question 2/10
    4 / -1
    A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of thematerial is
    Solutions

  • Question 3/10
    4 / -1
    A certain wire has a resistance R. The resistance of another wire identical with the first except having twice its diameter is
    Solutions

  • Question 4/10
    4 / -1
    In hydrogen atom, the electron makes 6.6 × 1015revolutions per second around the nucleus in an orbit of radius 0.5 × 10–10m . It is equivalent to a current nearly
    Solutions

  • Question 5/10
    4 / -1
    A wire of length 5 m and radius 1 mm has a resistance of 1 ohm. What length of the wire of the same material at the same temperature and of radius 2 mm will also have a resistance of 1 ohm?
    Solutions

  • Question 6/10
    4 / -1
    Consider a rectangular slab of length L and area of cross-section A. A current I is passed through it. If the length is doubled, the potential drop across the end faces
    Solutions

  • Question 7/10
    4 / -1
    A wire of resistance R is elongated n-fold to make a new uniform wire. The resistance of new wire
    Solutions

  • Question 8/10
    4 / -1
    A metallic block has no potential difference applied across it, then the mean velocity of free electrons is (T = absolute temperature of the block)
    Solutions

  • Question 9/10
    4 / -1
    In the absence of applied potential, the electric current flowing through a metallic wire is zero because
  • Question 10/10
    4 / -1
    Dimensions of a block are 1 cm × 1 cm × 100 cm. If specific resistance of its material is 3 × 10–7ohm–m, then the resistance between the opposite rectangular faces is
    Solutions

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