Server-Side Computing Model Quiz (Lec3)

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?

Floating-point (B) Signup and view all the answers

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

null (C) Signup and view all the answers

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

Using uppercase letters for variable declarations (A) Signup and view all the answers

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

Using the + operator (D) Signup and view all the answers

What does the function JSON.parse do in JavaScript?

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

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

Low efficiency in handling orders (C) Signup and view all the answers

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

Increase the number of simultaneous connections (C) Signup and view all the answers

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

Increase client libraries (D) Signup and view all the answers

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

Time-consuming and low efficiency (A) Signup and view all the answers

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

$group (A) Signup and view all the answers

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

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

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

Converts the aggregated data into an array (B) Signup and view all the answers

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

restaurant (D) Signup and view all the answers

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

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

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

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

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

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

What does the $or operator do in MongoDB?

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

What is the purpose of the 'aggregateRestaurants' function?

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Server-Side Computing Model Quiz (Lec3)

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Questions and Answers

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

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

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

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

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

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

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

What does the function JSON.parse do in JavaScript?

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

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

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

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

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

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

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

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

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

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

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

What does the $or operator do in MongoDB?

What is the purpose of the 'aggregateRestaurants' function?

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

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

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

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

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

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

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

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

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

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