Selected MCQ

Current Question
In neural networks, what is 'backpropagation' used for?
  • A. Adjusting weights using gradient descent
  • B. Propagating inputs through layers
  • C. Generating output predictions
  • D. Normalizing data
Correct Answer: A
Explanation:
Backpropagation computes the gradients of the loss with respect to the network weights, which are then used to update them via optimization methods.
Related Question 1
Which activation function is commonly used in hidden layers of deep neural networks due to its ability to mitigate vanishing gradient problems?
  • A. Sigmoid
  • B. Tanh
  • C. ReLU
  • D. Softmax
Correct Answer: C
Explanation:
ReLU (Rectified Linear Unit) is popular for hidden layers because it accelerates convergence by avoiding vanishing gradients.
Related Question 2
What is the primary advantage of using a GPU over a CPU for training deep neural networks?
  • A. Faster single-thread performance
  • B. Large memory capacity
  • C. Parallel processing of many operations
  • D. Built-in neural network instructions
Correct Answer: C
Explanation:
GPUs can perform many operations in parallel, greatly speeding up matrix computations in neural network training.
Related Question 3
Which technology is used for secure, short-range wireless communication in IoT devices?
  • A. Wi-Fi
  • B. Bluetooth Low Energy (BLE)
  • C. Ethernet
  • D. 4G LTE
Correct Answer: B
Explanation:
Bluetooth Low Energy is a wireless protocol for low-power short-range communication.
Related Question 4
What is a 'digital twin' used for?
  • A. A backup of a database
  • B. A virtual model of a physical system for simulation
  • C. An identical computer router
  • D. Digital photography editing
Correct Answer: B
Explanation:
A digital twin is a software model that simulates a physical object or system.
Related Question 5
In IoT, what is MQTT primarily used for?
  • A. Hardware design
  • B. Lightweight messaging protocol
  • C. Database management
  • D. Encryption standard
Correct Answer: B
Explanation:
MQTT is a lightweight publish/subscribe messaging protocol widely used in IoT.