Question:
Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?
Which of the following will NOT be observed when a multimeter (operating in resistance measuring mode) probes connected across a component, are just reversed?
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In resistance mode the meter's internal cell drives a small current: a wire and a resistor conduct both ways, an LED conducts one way, and a capacitor gives only a brief kick while charging.
Updated On: Nov 5, 2026
- Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is metal wire.
- 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.
- Multimeter shows an equal deflection in both cases i.e. before and after reversing the probes if the chosen component is resistor.
- Multimeter shows NO deflection in both cases i.e. before and after reversing the probes if the chosen component is capacitor.
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The Correct Option is D
Solution and Explanation
In ohmmeter mode the internal battery sends current through the component and the needle deflection reflects its resistance.
(1) Metal wire: very low resistance, so a large deflection in both directions.
(2) LED: conducts in forward bias only, so deflection in one direction and none after reversal.
(3) Resistor: same deflection in both directions.
(4) Capacitor: once charged, no dc current flows, so in the steady state there is no deflection for either polarity.
Taking the option intended by the paper setter as (4), the statement about the capacitor is the one marked as NOT observed (see notes: option (1) is also physically wrong).
Answer: (4) Multimeter shows NO deflection in both cases ... if the chosen component is capacitor.
(1) Metal wire: very low resistance, so a large deflection in both directions.
(2) LED: conducts in forward bias only, so deflection in one direction and none after reversal.
(3) Resistor: same deflection in both directions.
(4) Capacitor: once charged, no dc current flows, so in the steady state there is no deflection for either polarity.
Taking the option intended by the paper setter as (4), the statement about the capacitor is the one marked as NOT observed (see notes: option (1) is also physically wrong).
Answer: (4) Multimeter shows NO deflection in both cases ... if the chosen component is capacitor.
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