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Current Electricity Test - 37
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Current Electricity Test - 37

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  • Question 1/10
    4 / -1
    The resistivity of alloys = Ralloy;the resistivity ofconstituent metals Rmetal . Then, usually
  • Question 2/10
    4 / -1
    Two wires A and B of same material and same mass have radii 2r and r respectively. If resistance of wire A is 34 Ω, then resistance of B will be
    Solutions

  • Question 3/10
    4 / -1
    Two rods of same material and length have their electric resistances in ratio 1:2. When both rods are dipped in water, the correct statement will be
    Solutions

  • Question 4/10
    4 / -1
    Two different conductors have same resistance at 0°C. It is found that the resistance of the first conductor at t1° C is equal to the resistance of the second conductor at t2° C. The ratio of the temperature coefficients of resistance of the conductors, α1/α2 is
    Solutions

  • Question 5/10
    4 / -1
    The resistance of a wire at room temperature 30° C is found to be 10 Ω. Now to increase the resistance by 10%, the temperature of the wire must be [The temperature coefficient of resistance of the material ofthe wire is 0.002 per °C]
    Solutions

  • Question 6/10
    4 / -1
    A current I is passing through a wire having two sections P and Q of uniform diameters d and d/2 respectively. If the mean drift velocity of electrons in sections P and Q is denoted by vP and vQ respectively,then
    Solutions

  • Question 7/10
    4 / -1
    If an electric current is passed through a nerve of a man, then man
  • Question 8/10
    4 / -1
    The mobility of free electrons (charge e, mass m and relaxation time T) in a metal is proportional to
  • Question 9/10
    4 / -1
    The resistance of a conductor is 5 ohm at 50°C and 6 ohm at 100°C. Its resistance at 0°C is
    Solutions

  • Question 10/10
    4 / -1
    A block has dimensions 1 cm, 2 cm, 3 cm. Ratio of the maximum resistance to minimum resistance between any point of opposite faces of this block is
    Solutions

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