MDCAT Physics — Electronics
Electronics is a core Physics topic in the PMDC MDCAT syllabus, covering 8 subtopics. Below are the subtopics to revise, how often the topic appears in past papers, and real past-paper MCQs to try.
Subtopics (8)
- Cathode Ray Oscilloscope (CRO)
- Logic Gates
- Operational Amplifiers (OP-AMP)
- PN Junction (Forward and Reverse Bias)
- Rectification (Half and Full Wave)
- Semiconductors
- Semiconductors (p-type, n-type)
- Transistors (NPN/PNP)
How Electronics is tested
Across the 16 MDCAT past papers on ParhaiKrlo, Electronics accounts for 36 questions. It appears in 14 of them, about 2.6 questions a paper. The heaviest was MDCAT 2009, with 5 questions, and the most recent is MDCAT 2024, with 3.
| Paper | Questions |
|---|---|
| MDCAT 2024 | 3 |
| MDCAT 2023 | 1 |
| MDCAT 2022 | 1 |
| MDCAT 2019 | 1 |
| MDCAT 2018 | 4 |
| MDCAT 2016 | 2 |
| MDCAT 2015 | 3 |
| MDCAT 2014 | 2 |
| MDCAT 2013 | 1 |
| MDCAT 2012 | 3 |
| MDCAT 2011 | 2 |
| MDCAT 2010 | 4 |
| MDCAT 2009 | 5 |
| MDCAT 2008 | 4 |
Electronics MCQs from the MDCAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · MDCAT 2024 · Electronics
The conversion of A.C into D.C is called rectification and circuit is called rectifier. Which component of electronics acts as a rectifier?
- A.Diode
- B.Transistor
- C.Transformer
- D.Inductor
Show answer
Answer: A. Diode — A diode is the electronic component that performs rectification (AC to DC conversion).
- Q2 · MDCAT 2023 · Electronics
For the positive half cycle i.e., 0 → T/2, the diode D:
- A.Is reverse biased
- B.Is forward biased
- C.Behaves as open
- D.Shows maximum resistance
Show answer
Answer: B. Is forward biased — During the positive half cycle of an AC signal, diode D is forward biased, allowing current to flow through it.
- Q3 · MDCAT 2022 · Electronics
When the temperature of semiconductor suddenly drops to zero kelvin, then a semiconductor acts as:
- A.Conductor
- B.Semi-conductor
- C.Super conductor
- D.Insulator
Show answer
Answer: D. Insulator — At absolute zero, a semiconductor has no thermally excited charge carriers, so it behaves as a perfect insulator.