Field Effect Transistors (FET) MCQs

Prepare for Field Effect Transistors (FET) MCQs with verified questions, past-paper solutions, and conceptual explanations for CSS, PMS, FPSC, PPSC, and NTS examinations.

16 Solved Questions • 12 Mins Practice • Updated for 2026 Competitive Exams
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Field Effect Transistors (FET) constitutes an essential examination topic within Physics, evaluating theoretical principles, historical context, and practical problem-solving applications. On MCQsMind, candidates practice verified past-paper solutions, conceptual breakdowns, and syllabus-aligned questions tailored for CSS, PMS, and competitive screening examinations.

Welcome to the verified preparation module for Electronics & Semiconductor Devices on McqsMind. This comprehensive set offers solved multiple-choice questions with answers, detailed explanations, and authentic past-paper style questions aligned with the latest syllabus of Electronics & Semiconductor Devices (Physics).

100% Verified Answer Keys CSS, PMS, FPSC, PPSC, NTS Ready 2026/2027 Syllabus Guidelines

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Topic Notes: Field Effect Transistors (FET)

Quick Revision 3 min read 16 key points
Section 1 of 4

1 1. Fundamentals of FETs

4 points
  • Definition
    Field Effect Transistor (FET): A unipolar semiconductor device where the flow of current is controlled by an electric field rather than current injection, making it a voltage-controlled device.
  • Definition
    Unipolar Nature: Unlike BJTs, FETs rely on only one type of charge carrier (either electrons or holes) to conduct current through the channel.
  • Fact
    Input Impedance: FETs possess extremely high input impedance (often in the mega-ohm range) because the gate is isolated from the channel, minimizing loading effects on preceding stages.
  • Fact
    Thermal Stability: FETs exhibit a negative temperature coefficient of conductivity, meaning they are less prone to thermal runaway compared to BJTs.
Section 1 / 4
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1
What is the primary cause of 'short-channel effects' in modern sub-micron MOSFETs?
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2
Which type of FET is known for having a channel that is physically present even at zero gate voltage?
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3
What effect does the 'Body Effect' have on an enhancement-mode MOSFET?
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4
In a CMOS circuit, what is the primary benefit of using both PMOS and NMOS transistors?
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5
What is the function of the substrate (body) terminal in a standard discrete MOSFET?
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6
Which parameter represents the ratio of change in drain current to the change in gate-source voltage in a FET?
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7
What phenomenon occurs when the drain-source voltage (VDS) exceeds the maximum rating of a MOSFET?
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8
What is the typical input impedance of a MOSFET compared to a BJT?
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9
In an enhancement-mode MOSFET, what is required to create a conductive channel between the source and drain?
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10
What is the primary advantage of using a MOSFET over a BJT in high-frequency switching applications?
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Pedagogical Syllabus Blueprint

Field Effect Transistors (FET) MCQs: Preparation Strategy & Exam Blueprint

Examination Weightage & Commission Distribution

In Pakistan's premier competitive examinations—including the Federal Public Service Commission (FPSC General Recruitment & CSS MPT), Punjab Public Service Commission (PPSC Lecturer, Tehsildar & PMS Screening), KPPSC, SPSC, and BPSC—questions derived from Field Effect Transistors (FET) MCQs consistently constitute a decisive 10% to 25% weightage of the Electronics & Semiconductor Devices paper. Testing agencies frequently evaluate both foundational factual recall and deeper analytical comprehension, requiring aspirants to master key dates, statutory articles, constitutional clauses, and thematic definitions.

High-Yield Conceptual Pillars & Distractor Analysis

Historical trend analysis across past five-year examination cycles demonstrates that examiner traps frequently involve closely matched numerical alternatives, chronologically contiguous treaties, and semantic subtleties in statutory phraseology. When preparing Field Effect Transistors (FET) MCQs, candidates must deliberately review the underlying rationale provided for every question rather than merely memorizing raw answer options. Understanding why incorrect distractors fail is the most reliable predictor of achieving top percentiles in computerized and optical mark recognition (OMR) screening tests.

Negative Marking Mitigation & Time Management Protocol

For examinations enforcing negative marking penalties (such as PPSC's 0.25-mark deduction per erroneous response or NTS gatekeeper quotas), an aggressive elimination technique must be deployed. Candidates should systematically rule out improbable options first to elevate probability thresholds from 25% to 50% or 100%. Allocating an average of 45 to 60 seconds per item during mock trials builds the psychological stamina and cognitive precision required to complete 100-question papers within official 90-minute time limits.

Recommended Reference Sources & Statutory Reading

To achieve definitive conceptual mastery in Physics, candidates are advised to cross-reference our solved explanations with primary gazettes, statutory texts, and canonical academic textbooks. Verifying controversial questions against authentic official repositories guarantees that prospective civil servants and professional candidates present incontestable answers during both optical paper evaluations and viva voce departmental interviews.