Verified Solution • 2025–26 Session moderate

QPage 352: Q5: HC Verma: Concepts of Physics - Volume 2 Electric Current through Gases Page 352: Q5 Solution: Mark the correct options.

⚠️ Common Exam Traps & Conceptual Pitfalls

Students frequently assume that because a triode contains a diode section it can be used as a rectifier, or that a diode can amplify because any tube conducts current. Remember: rectification needs a two‑electrode device with unidirectional conduction (diode), while amplification requires a third control electrode (grid) to modulate current (triode).

Mark the correct options.

Multiple Choice Options

  • A A diode valve can be used as a rectifier.
  • B A triode valve can be used as a rectifier.
  • C A diode valve can be used as an amplifier.
  • D A triode valve can be used as an amplifier.

Step-by-Step Verified Solution

**Answer:** (a), (d). **Step-by-Step Explanation:** A diode can be used as a rectifier (a). A triode can be used as an amplifier (d).

All Questions in this Chapter

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