O Level PR-4 — Viva Questions

Most-asked viva questions with short, exam-ready answers.

1 PDF + 1 video class available — all free

1PR-4 IoT Viva Questions with Answers13-page viva question bank — the most frequently asked questions on Arduino, sensors, actuators and IoT.Open

Viva Questions — Video Classes

1 free class — tap any video to play it right here

1IoT Viva Exam — Most Important Questions (PR-4) 33:39

PR4 Home Video Classes Full Course

Run these Arduino sketches on a virtual board — free

No kit needed: wire a virtual Arduino Uno in the simulator and watch the LEDs, LCD and sensors respond to your sketch. Each explained project gives the code and the wiring.

Open Arduino simulator Arduino Projects explained Practice questions