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Electronic Devices Test -12

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Electronic Devices Test -12
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Weekly Quiz Competition
  • Question 1
    1 / -0

    In a photoelectric cell, the photoelectric current depends on the

    Solution

    Photocurrent is proportional to incident light intensity.

  • Question 2
    1 / -0

    Domestic power supply in India is

    Solution

    In India, we use electricity at 220 volt and 50 hertz.

  • Question 3
    1 / -0

    In a semiconductor crystal, if current flows due to breakage of crystal bonds, then the semiconductor is called

    Solution

    In the case of an intrinsic semiconductor (say Si) where each Si is having 4 outermost electrons, its crystal structure consists of making 4 covalent bonds with 4 neighbouring Si atoms. Each bond consists of two electrons. Now if one oi the bonds get broken due to some reason (collisions or high temperature) then one electron gets free and it will be having sufficient energy to cross the band gap and be ready for conduction. So in intrinsic semiconductors, current flows due to breakage of crystal bonds.

  • Question 4
    1 / -0

    When n–type of semiconductor is heated,

    Solution

    Due to heating, a free electron is produced, then simultaneously a hole is also produced.

  • Question 5
    1 / -0

    The output from a full wave rectifier is

    Solution

    A rectifier which rectifies both halves of each a.c. input cycle is called a full wave rectifier. The output of a full wave rectifier is continuous but pulsating in nature. However, it can be made smooth by using a filter circuit.

  • Question 6
    1 / -0

    A half wave rectifier is being used to rectify an alternating voltage of frequency 50 Hz. The number of pulses of rectified current obtained in one second is

    Solution

    For each complete cycle of input ac, we get one pulse in the output (that lasts for the positive half cycle of the input). Since, there is one pulse per input cycle, the pulse frequency is also 50 Hz.

  • Question 7
    1 / -0

    The manifestation of band structure in solids is due to:

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