5G NR Physical Layer Question Bank

This practice-only course is a focused question bank with 300+ hand-crafted questions and answers on the 5G NR Physical Layer. The questions are designed around concepts that are also highly relevant to 4G/LTE PHY and future 6G physical-layer discussions, so solving them will strengthen your fundamentals across generations.

You will not just “read” theory here; you will solve questions and immediately see the correct answers with clear explanations.

What you will get in this course

• 300+ interview-style questions on 5G NR Physical Layer.

• A mix of single-correct MCQs and integer-type numericals.

• Questions covering a wide range of PHY-related topics, including (but not limited to):

  • OFDM, numerologies, CP, and spectrum usage

  • Resource grid, slots, symbols, subcarriers, RBs, and BWPs

  • Synchronization (SS/PBCH block, PSS/SSS, PBCH)

  • Downlink and uplink channels: PDCCH, PDSCH, PUCCH, PUSCH, PBCH, PRACH

  • Uplink and downlink reference signals: DMRS, CSI-RS (ZP/NZP, CSI-IM), SRS, PTRS

  • Modulation, coding, MCS, TBS, and throughput calculation

  • HARQ, retransmissions, code block groups, and timing

  • MIMO, rank, precoding, beamforming, and beam management

  • Power control concepts at PHY level (PUSCH/PUCCH/PRACH basics)

  • Timing advance, TA calculation, and impact on coverage

  • Initial access and random access procedure (RA/PRACH)

  • Key RRC parameters that directly affect PHY behaviour, e.g.:

    • SSB periodicity, SSB burst configuration

    • PRACH configuration index, RACH windows, and RA-related timers

    • PUCCH/PUCCH-Config, PUSCH/PUSCH-Config, and CSI reporting-related parameters

    • BWP-related parameters and TDD pattern configuration impacting PHY

  • Basic measurement and reporting concepts that tie RRC and PHY together

  • Other practical PHY scenarios relevant to real deployments and lab testing

• Immediate feedback: see the correct answer + explanation after each question

• Questions are arranged in multiple difficulty levels so you can move from fundamentals to more challenging interview-style problems

How this course is structured

• This is a pure practice test/question bank, not a theory lecture course.

• Questions are grouped across difficulty levels (from simpler checks to more detailed interview questions).

• Every question has:

  • A clearly defined single correct option (for MCQs), or

  • An integer answer (for numericals), and

  • A crisp explanation to show the reasoning or the key formula/logic.

• You can attempt questions in order or jump to specific areas depending on your weak topics.

Use this course to:

• Warm up before 5G NR PHY interviews

• Check if your 4G/5G physical layer fundamentals are apparent

• Build a more substantial base for future 6G physical layer discussions

• Identify gaps and quickly revise the underlying concepts in your main theory course, specs, or books

Who this course is for

This question bank is ideal for:

• 4G/5G PHY engineers preparing for modem/RAN/Layer-1 roles

• L2/MAC/RF/RNO engineers who want to move closer to PHY design and development

• Working professionals preparing for interviews in 5G companies (modem vendors, OEMs, operators, startups, etc.)

• Students and fresh graduates who already know basic 4G/5G and want interview-oriented practice on the physical layer

• Engineers interested in 6G discussions who wish to ensure their 4G/5G PHY foundations are solid

Prerequisites

• You should already be familiar with basic 4G/5G concepts, especially OFDM and the NR/LTE physical-layer building blocks.

• This is a practice-only course, assuming you have studied the theory elsewhere (course/book/specs) and now want to verify and deepen your understanding through questions.

If you are serious about 5G NR Physical Layer interviews, this question bank will help you evaluate where you stand – and what you need to revise – before entering the interview room.