Medium MCQ +4 / -1 PYQ · JEE Mains 2020

Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?

  1. A Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is metal wire.
  2. B Multimeter shows a deflection, accompanied by a splash of light out of connected component in one direction and NO deflection on reversing the probes if the chosen component is LED.
  3. C Multimeter shows an equal deflection in both cases i.e. before and after reversing the probes if the chosen component is resistor.
  4. D Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is capacitor. Correct answer

Solution

(1) Multimeter shows deflection when it connects with capacitor. <br><br>(2) If we assume that LED has negligible resistance then multimeter shows no deflection for the forward bias but when it connects in reverse direction, it break down occurs so splash of light out. <br><br>(3) The resistance of metal wire may be taken zero, so no deflection in multimeter. <br><br>(4) No matter, how we connect the resistance across multimeter. It shows same deflection.

About this question

Subject: Physics · Chapter: Electronic Devices · Topic: p-n Junction Diode

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