# MCQs on Valve Electronics (Diode and Triode) for NEET 2023

NEET  Physics is the scoring paper in the medical entrance examination. Here, you will discover the NEET Physics MCQ Questions for all Concepts as per the latest syllabus. Practice more on a regular basis with these NEET Physics objective questions on air pollution and improve your subject knowledge & problem-solving skills along with time management. NEET Physics Valve Electronics (Diode and Triode) Multiple Choice Questions make you feel confident in answering the question in the exam & increases your scores to high.

## MCQs on Valve Electronics (Diode and Triode)

1. Number of secondary electrons emitted per number of primary electrons depends on
(a) Material of target
(b) Frequency of primary electrons
(c) Intensity
(d) None of the above

2. In a diode, when there is saturation current, the plate resistance is
(a) Zero
(b) Infinite
(c) Some finite quantity
(d) Data is insufficient

3. The grid voltage of any triode valve is changed from 1 volt to 3 volt and the mutual conductance is 3 x 10-4 mho. The change in plate circuit current will be
(a) 0.8 mA
(b) 0.6 mA
(c) 0.4 mA
(d) 1 mA

4. For a given plate voltage the plate current in a triode is maximum when the potential of
(a) The grid is positive and the plate is negative
(b) The grid is positive and the plate is positive
(c) The grid is zero and the plate is positive
(d) The grid is negative and the plate is positive

Answer: (b) The grid is positive and the plate is positive

5. The amplification factor of a triode is 20. If the grid potential is reduced by 0.2 volt then to keep the plate current constant its plate voltage is to be increased by
(a) 10 volt
(b) 4 volt
(c) 40 volt
(d) 100 volt

6. The amplification produced by a triode is due to the action of
(a) Filament
(b) Cathode
(c) Grid
(d) plate

7. In a triode amplifier, the value of maximum gain is equal to
(a) Half the amplification factor
(b) Amplification factor
(c) Twice the amplification factor
(d) Infinity

8. The voltage gain by the triode depends on
(a) Filament voltage
(b) Plate voltage
(c) Plate resistance
(d) Plate current

9. In a triode valve
(a) If the grid voltage is zero then plate current will be zero
(b) If the temperature of the filament is doubled, then the thermionic current will also be doubled.
(c) If the temperature of the filament is doubled, then the thermionic current will nearly be four times
(d) At a definite grid voltage, the plate current varies with plate voltage according to Ohm’s law