Trigger types (HTTP, Timer, Blob, Queue) in Azure - Practice Problems & Coding Challenges

Challenge - 5 Problems

🧠 Conceptual

intermediate

Which trigger type starts a function when a new file is added?

In Azure Functions, which trigger type activates the function when a new file appears in a storage container?

A Timer trigger

B Blob trigger

C HTTP trigger

D Queue trigger

💡 Hint

Think about files and storage containers.

Blob trigger activates when a new file (blob) is added to Azure Blob Storage.

❓ query_result

intermediate

What is the output when a Timer trigger runs every 5 minutes?

If an Azure Function uses a Timer trigger set to run every 5 minutes, how many times will it run in one hour?

A 12 times

B 24 times

C 6 times

D 60 times

💡 Hint

Calculate how many 5-minute intervals fit in 60 minutes.

60 minutes divided by 5 minutes equals 12 runs per hour.

📝 Syntax

advanced

Identify the correct syntax for an HTTP trigger function in Azure Functions

Which option shows the correct way to define an HTTP trigger function in Azure Functions using Python?

Azure

import azure.functions as func

def main(req: func.HttpRequest) -> func.HttpResponse:
    return func.HttpResponse('Hello World')

A

def main(req: HttpRequest) -> HttpResponse:
    return HttpResponse('Hello World')

B

def main(request: func.HttpRequest) -> func.HttpResponse:
    return func.HttpResponse('Hello World')

C

def main(req: func.HttpRequest) -> func.HttpResponse:
    return func.HttpResponse('Hello World')

D

def main(req) -> func.HttpResponse:
    return func.HttpResponse('Hello World')

💡 Hint

Check the parameter and return type annotations.

Option C correctly uses the parameter name 'req' with type func.HttpRequest and returns func.HttpResponse.

🔧 Debug

advanced

Why does this Queue trigger function fail to process messages?

Given this Azure Function code snippet, why does the Queue trigger not process messages? import azure.functions as func def main(msg: func.QueueMessage): print(msg.get_body())

A The function parameter should be named 'msg' and type func.QueueMessage, but the binding is missing in function.json.

B The parameter type should be func.QueueMessage instead of func.QueueMessage.

C The function is missing a return statement.

D The print statement should use msg.body instead of msg.get_body().

💡 Hint

Check the function bindings configuration.

The function code is correct, but without the proper queue trigger binding in function.json, the function won't be triggered.

❓ optimization

expert

Best practice to reduce cold start time for HTTP triggered Azure Functions

Which option is the best way to reduce cold start latency for HTTP triggered Azure Functions in a production environment?

A Increase the memory allocation of the function app to maximum.

B Disable the HTTP trigger and use manual invocation only.

C Switch the function to use Blob trigger instead of HTTP trigger.

D Use a Timer trigger to periodically call the HTTP function to keep it warm.

💡 Hint

Think about how to keep the function active.

Using a Timer trigger to call the HTTP function regularly keeps the function app warm, reducing cold start delays.