Server-Side Computing Model Quiz (Lec3)
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Questions and Answers

Which of the following is NOT a property of Node.js?

  • Event-driven
  • Multi-threaded (correct)
  • Non-blocking
  • Asynchronously programming

Which of the following is true about callbacks in Node.js?

  • They are only used for I/O calls
  • They are invoked asynchronously (correct)
  • They are executed synchronously
  • They are executed in a separate thread

What is the purpose of the event loop in Node.js?

  • To execute callback functions (correct)
  • To switch between different orders
  • To handle incoming connections
  • To process requests one-by-one

What is the data type used for representing all numbers in JavaScript?

<p>Floating-point (B)</p> Signup and view all the answers

Which of the following data types in JavaScript evaluate to false?

<p>null (C)</p> Signup and view all the answers

Which of the following is a correct way to declare a constant in JavaScript?

<p>Using uppercase letters for variable declarations (A)</p> Signup and view all the answers

Which of the following is a correct way to add two strings together in JavaScript?

<p>Using the + operator (D)</p> Signup and view all the answers

What does the function JSON.parse do in JavaScript?

<p>Converts a JSON string to an object (D)</p> Signup and view all the answers

Which of the following is a common problem with blocking I/O in server-side applications?

<p>Low efficiency in handling orders (C)</p> Signup and view all the answers

What is one of the previous solutions to address blocking I/O problems?

<p>Increase the number of simultaneous connections (C)</p> Signup and view all the answers

What is one of the evolved solutions to address blocking I/O problems?

<p>Increase client libraries (D)</p> Signup and view all the answers

What is the main drawback of blocking I/O in web applications?

<p>Time-consuming and low efficiency (A)</p> Signup and view all the answers

Which method is used to group documents in the 'aggregateRestaurants' function?

<p>$group (A)</p> Signup and view all the answers

What is the purpose of the $sum operator in the 'aggregateRestaurants' function?

<p>To calculate the sum of a numeric field (C)</p> Signup and view all the answers

What does the 'toArray' method do in the 'aggregateRestaurants' function?

<p>Converts the aggregated data into an array (B)</p> Signup and view all the answers

In which collection is the 'aggregateRestaurants' function performing the aggregation?

<p>restaurant (D)</p> Signup and view all the answers

Which of the following statements is true about the switch statement in JavaScript?

<p>The switch statement executes the code block that matches the value of the expression. (A)</p> Signup and view all the answers

What is the purpose of the 'while' loop in JavaScript?

<p>To execute a block of code as long as a specified condition is true. (A)</p> Signup and view all the answers

Which of the following statements is true about querying by a field in an array in MongoDB?

<p>The query returns documents where the specified field in the array matches the specified value. (C)</p> Signup and view all the answers

What does the $or operator do in MongoDB?

<p>The $or operator returns documents that match any of the specified conditions. (D)</p> Signup and view all the answers

What is the purpose of the 'aggregateRestaurants' function?

<p>The purpose of the 'aggregateRestaurants' function is to perform aggregation operations on the 'restaurant' collection in the database.</p> Signup and view all the answers

What does the $group operator do in the 'aggregateRestaurants' function?

<p>The $group operator is used to group documents together based on a specified key and perform aggregation functions on the grouped data.</p> Signup and view all the answers

What is the purpose of the $sum operator in the 'aggregateRestaurants' function?

<p>The purpose of the $sum operator is to calculate the sum of a specified field in the grouped documents.</p> Signup and view all the answers

What does the $match operator do in the 'aggregateRestaurants' function?

<p>The $match operator is used to filter documents based on specified criteria.</p> Signup and view all the answers

What is the purpose of the 'toArray' method in the 'aggregateRestaurants' function?

<p>The purpose of the 'toArray' method is to convert the result of the aggregation operation into an array of documents.</p> Signup and view all the answers

What is one of the common problems with blocking I/O in server-side applications?

<p>One of the common problems with blocking I/O in server-side applications is that it can lead to poor performance and scalability.</p> Signup and view all the answers

What is the main drawback of blocking I/O in web applications?

<p>The main drawback of blocking I/O in web applications is that it can cause the application to become unresponsive and slow.</p> Signup and view all the answers

What is the purpose of the event loop in Node.js?

<p>The purpose of the event loop in Node.js is to handle asynchronous operations and ensure non-blocking I/O.</p> Signup and view all the answers

In which collection is the 'aggregateRestaurants' function performing the aggregation?

<p>The 'aggregateRestaurants' function is performing the aggregation on the 'restaurant' collection.</p> Signup and view all the answers

What is a correct way to declare a constant in JavaScript?

<p>A correct way to declare a constant in JavaScript is using the 'const' keyword followed by the variable name and its initial value.</p> Signup and view all the answers

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