IoT Situational-Based MCQs - Basic to intermediate

A home automation IoT system stops responding to user commands from a mobile app. What should be checked first?

• Cloud storage configuration

• Device power supply and Wi-Fi connectivity

• User interface design

• Microcontroller pin mapping

You're designing a temperature sensor node for agriculture. What’s the most power-efficient communication protocol to use?

• Bluetooth Classic

• Zigbee

• Wi-Fi

• LoRa

Your ESP32-based IoT device overheats after prolonged operation. What’s a possible cause?

• Using battery instead of adapter

• Excessive Wi-Fi transmission intervals

• OLED display resolution

• I2C bus delay

You need to deploy multiple IoT sensors in a large field. Which network topology suits best?

• Star topology with Wi-Fi

• Point-to-point with BLE

• Mesh topology with Zigbee

• Ring topology with UART

A motion sensor sends data to cloud every 1 second. What issue may occur?

• Low sensitivity

• Data loss due to bandwidth limitation

• Longer sleep mode

• Temperature drift

A user wants to monitor their smart water meter remotely. Which architecture component handles remote access?

• Actuator

• Cloud server

• Local storage

• MQTT broker

You’ve implemented MQTT protocol. What does the “broker” do?

• Stores data logs

• Routes messages between publishers and subscribers

• Converts analog signals

• Encrypts Wi-Fi

Which sensor is best suited to detect gas leakage in a smart kitchen system?

• DHT11

• BMP180

• MQ-2

• LDR

A smart irrigation system fails to activate at scheduled time. What’s the likely cause?

• Moisture sensor broken

• Timer service not implemented properly

• Cloud storage failure

• Wrong soil type

You’re testing your IoT prototype but getting inconsistent sensor data. What’s your first debugging step?

• Increase Wi-Fi range

• Check sensor wiring and calibration

• Change cloud provider

• Adjust MQTT topic