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NDA - Current Electricity Test 1411
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NDA - Current Electricity Test 1411
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  • Question 1/5
    1 / -0.33
    With an increase in the temperature of the wire, the resistance of the wire?

    Solutions

    With an increase in temperature the resistance of the wire increases. This is due to the fact that the vibration of atoms increases with an increase in temperature.

    Therefore, electrons experience greater resistance while moving as they collide more frequently with the vibrating atoms. Hence the resistance increases.

  • Question 2/5
    1 / -0.33
    What is Voltage and frequency of power supply in India?
    Solutions

    In India, the frequency of the supply is 50 Hz, and the Voltage is 220 - 240 V.

    Low frequency is used to minimize the losses, mainly due to eddy current.

    The frequency noise in transmission cable is less for 50 Hz.

    The three-phase Voltage is 415- 440 V.

  • Question 3/5
    1 / -0.33
    Which of the following is the graph of an ohmic resistance?
    Solutions

    Ohm’s law states that the current is directly proportional to the voltage across the resistor.
    V = IR

    Substances that obey ohm’s law are known as the ohmic substance.

    The voltage versus current graph of an ohmic substance is a straight line passing through the origin.

  • Question 4/5
    1 / -0.33
    A copper wire of resistance R has been stretched to twice its initial length. The resistivity of the wire will.

    Solutions

  • Question 5/5
    1 / -0.33
    Which of the following is true about a fuse?

    Solutions
    As a high amount of current is passing, resistances of the fuse wire have to be large due to which the heat produced will be high and it is broken down immediately. Hence, fuse wire is a wire of high resistance and low melting point. 
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