Quiz

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Total 80 questions
Total time 2 hours
Passing at minimum 40 points

Full Name

Phone

What is the maximum number of symbols that will appear on the stack AT ONE TIME during the conversion of this infix expression to postfix: 4 + 3*(6*3-12)?

None

In an embedded system, what does the volatile keyword indicate?

The variable cannot be changed.

The variable is thread-safe.

The variable is stored in cache memory.

The variable value can be changed unexpectedly.

None

What will be the output of the following code snippet?

var a = "hello";
var sum = 0;
for(var i = 0; i < a.length; i++) {
sum += (a[i] - 'a'); }
print(sum);

None of the above

NaN

None

What is the maximum number of nodes in a binary tree of height h?

2^h - 1

2^(h-1)

h^2

2^(h+1) - 1

None

Which data structure is used for implementing LRU (Least Recently Used) cache?

Hash Map with Doubly Linked List

Queue

Binary Search Tree

Stack

None

Which protocol is most commonly used for lightweight communication in IoT?

HTTP

SOAP

MQTT

FTP

None

Which of the following can cause undefined behavior in C++?

All of the above

Accessing out-of-bounds indices in a std::vector

Dereferencing a null pointer

Modifying a std::set while iterating through it

None

What is the primary purpose of the std::enable_if template in C++?

To conditionally compile code based on template parameters

To enable runtime polymorphism

To improve compile-time error messages

To manage memory automatically

None

Which of the following is the best data structure for implementing a priority queue?

Heap

Stack

Binary Search Tree

Linked List

None

10.

What does the noexcept specifier indicate in C++?

That a function throws only standard exceptions

That a function is guaranteed not to throw exceptions

That a function will terminate if an exception is thrown

None of the above

None

11.

Which series will be printed by the following pseudocode?

Integer a, b, c
Set b = 4, c = 5
for(each a from 2 to 4)
print c
b = b - 1
c = c + b
end for

5 8 10

3 6 9

8 9 10

1 3 6

None

12.

What is the time complexity of inserting an element into a sorted linked list?

O(n log n)

O(log n)

O(n)

O(1)

None

13.

What is the size of a char in most embedded systems?

1 byte

1 bit

4 bytes

2 bytes

None

14.

What is the function of a message broker in IoT systems?

To manage communication between devices

To secure IoT devices from attacks

To update firmware of IoT devices

To store IoT device credentials

None

15.

What is the Purpose of the Next Parameter in Express.js Middleware Functions?

It sets the HTTP response status code

It terminates the middleware chain

It passes control to the next function in the stack

It handles errors thrown by the middleware

None

16.

What does the term "collision" mean in the context of hash tables?

The hash function does not exist.

Two keys map to different hash values.

A key maps to a non-existent hash value.

Two keys map to the same hash value.

None

17.

Which statement is incorrect regarding binary trees?

Let T be a binary tree. For every k ≥ 0, there are no more than 2k nodes in level k

Let T be a binary tree with λ levels. Then T has no more than 2λ – 1 nodes

Let T be a binary tree with N nodes. Then the number of levels is at least ceil(log (N + 1))

Let T be a binary tree with N nodes. Then the number of levels is at least floor(log (N + 1))

None

18.

What is the default port number used by the MQTT protocol?

443

1883

None

19.

In a typical embedded system, what is the primary purpose of a watchdog timer?

To schedule tasks

To provide delay functionality

To reset the system in case of a malfunction

To manage power consumption

None

20.

What is the correct order of the phases in an embedded C program development cycle?

Compilation → Linking → Debugging → Execution

Linking → Compilation → Debugging → Execution

Debugging → Compilation → Execution → Linking

Execution → Debugging → Compilation → Linking

None

21.

Choose the component which should be overridden to stop the component from updating?

willComponentUpdate

componentDidMount

componentDidUpdate

shouldComponentUpdate

None

22.

In a balanced binary tree, the height difference between left and right subtrees for every node is:

Arbitrary

At least 1

At most 1

Always 1

None

23.

In which case is std::move most useful?

To create a deep copy of an object

To allocate memory dynamically

To compare two objects

To avoid copying in resource transfer

None

24.

What is used to handle code-splitting?

React.fallback

React.lazy

React.split

React.memo

None

25.

What is the purpose of ISR in an embedded system?

Interrupt Signal Reset

Input Signal Receiver

Interrupt Service Routine

Internal System Register

None

26.

Which of the following are not server-side Javascript objects?

All of the above

FileUpload

Date

Function

None

27.

Which MongoDB command removes all documents from a collection without dropping it?

db.collection.truncate()

db.collection.delete()

db.collection.remove({})

db.collection.drop()

None

28.

What is the role of a device shadow in IoT?

Provides a virtual representation of an IoT device

Stores the real-time location of the device

Acts as a backup device

Encrypts data between IoT devices

None

29.

What will be the output of the following code snippet?

function(){
setTimeout(()=> console.log(1),2000);
console.log(2);
setTimeout(()=> console.log(3),0);
console.log(4);
})();

2341

4321

1234

2431

None

30.

What does the emplace_back method do in a std::vector?

None of the above

Both of the above

Constructs an object in-place at the back of the vector

Pushes an already constructed object at the back of the vector

None

31.

Which sorting algorithm does std::sort use by default?

Heap Sort

Quick Sort

Hybrid Sort (Introsort)

Merge Sort

None

32.

What is the Event Loop in Node.js?

A loop that iterates through events and executes callback functions

A mechanism for handling HTTP requests

A data structure used for storing event listeners

A feature for executing JavaScript code synchronously

None

33.

Which of the following sorting algorithms has the best worst-case time complexity?

Merge Sort

Bubble Sort

Insertion Sort

Quick Sort

None

34.

What is the functionality of this code?

public int function(int data)
{
Node temp = head;
int var = 0;
while(temp != null)
{
if(temp.getData() == data)
{
return var;
}
var = var+1;
temp = temp.getNext();
}
return Integer.MIN_VALUE;

Find and delete a given element in the list

Find and return the position of the given element in the list

Find and insert a new element in the list

Find and return the given element in the list

None

35.

Which of the following concepts make extensive use of arrays?

Scheduling of processes

Caching

Spatial locality

Binary trees

None

36.

Which of the following protocols is commonly used for inter-device communication in embedded systems?

HTTP

DNS

SPI

FTP

None

37.

Construct a binary tree using the following sequences:

Inorder: N, M, P, O, Q
Postorder: N, P, Q, O, M

Option D

Option C

Option A

Option B

None

38.

What is the output of the following code snippet?

#include
#include
int main() {
std::vector v = {1, 2, 3, 4};
for (int &x : v) {
x *= 2;
}
for (int x : v) {
std::cout << x << " ";
}
return 0;
}

Compilation error

2 4 6 8

1 2 3 4

Undefined behavior

None

39.

Which of the following is NOT a valid storage class in Embedded C?

thread

auto

static

None

40.

What happens when a pointer to a NULL address is dereferenced in an embedded system?

The program continues execution normally.

The pointer automatically points to a valid memory location.

The program throws a compilation error.

It leads to undefined behavior or a crash.

None

41.

What is the time complexity of finding an element in std::unordered_map?

O(1)

O(n log n)

O(n)

O(log n)

None

42.

Which protocol provides device-to-device communication in IoT networks?

HTTPS

DNS

FTP

Zigbee

None

43.

What is the worst case time complexity of a sequence of n queue operations using the Multiqueue operation?

Multiqueue(Q)
{
m=k;
while(Q is not empty) and (m > 0)
{
DEQUEUE(Q)
m=m-1
}
}

θ(n²)

θ(nk)

θ(n)

θ(n + k)

None

44.

What does a digital twin represent in IoT?

An encryption mechanism

A software model of a physical object or process

A redundant device in the network

A physical replica of an IoT device

None

45.

What is the functionality of this code?

public void function(Node node)
{
if(size == 0)
head = node;
else
{
Node temp,cur;
for(cur = head; (temp = cur.getNext())!=null; cur = temp);
cur.setNext(node);
}
size++;
}

Deleting a node at the beginning of the list

Deleting a node at the end of the list

Inserting a node at the beginning of the list

Inserting a node at the end of the list

None

46.

Which of the following is a correct way to implement a thread-safe singleton in C++11?

Using double-checked locking with volatile keyword

Both a and b

Using std::mutex

Using std::call_once

None

47.

Which data structure is used for implementing recursion?

Queue

Stack

Linked List

Tree

None

48.

What is normalization in the context of databases?

The process of sorting data in ascending order

The process of encrypting data for security

The process of creating backup copies of data

The process of organizing data to minimize redundancy

None

49.

What is the advantage of std::function over raw function pointers?

It cannot point to a static member function

It can store stateful functors or lambda functions

It is not type-safe

None of the above

None

50.

In Node.js, which of the following is an in-built event emitter?

Events

EventLoop

EventEmitter

EventYield

None

51.

Which IoT platform is provided by Amazon?

AWS IoT Core

Azure IoT Hub

Google IoT Core

IBM Watson IoT

None

52.

Which encryption method is commonly used to secure IoT device communication?

DES

AES

SHA-1

MD5

None

53.

What is the significance of edge computing in IoT?

Increases latency in the network

Processes data closer to the IoT devices

Centralizes data processing in the cloud

Eliminates the need for local storage

None

54.

What will be the output of the following code snippet?

var a = true + true + true * 3;
print(a)

Error

None

55.

Which of the following is the correct syntax for a lambda function in C++?

lambda(int x) { return x * x; }

None of the above

function(int x) { return x * x; }

[ ](int x) { return x * x; }

None

56.

What is the difference between process.nextTick() and setImmediate()?

process.nextTick() is used to schedule a timeout, while setImmediate() schedules I/O operations.

process.nextTick() executes before the event loop continues, while setImmediate() executes after the current operation completes.

process.nextTick() executes after a timeout, while setImmediate() executes immediately.

process.nextTick() executes after the current operation completes, while setImmediate() executes before the event loop continues.

None

57.

Which of the following is a key feature of CoAP (Constrained Application Protocol)?

Relies on TCP

Uses XML for message encoding

Designed for high bandwidth networks

Based on UDP

None

58.

Which of the following is true about std::shared_ptr?

It uses reference counting to manage ownership

None of the above

It does not support weak references

It cannot be reset once assigned

None

59.

Which of the following terms commonly described react applications?

Declarative

Imperative

Integrated

closed

None

60.

Which directive is used to define macros in Embedded C?

#include

#define

#ifdef

#macro

None

61.

Which of the following statements is true about MongoDB's schema design?

MongoDB enforces primary keys on all documents

MongoDB collections have no fixed schema, allowing flexible document structures

MongoDB only supports simple data types

MongoDB requires a fixed schema for all collections

None

62.

In a binary search tree, what is the time complexity of finding the maximum or minimum element?

O(log n)

O(n)

O(n log n)

O(1)

None

63.

In IoT, what is the purpose of the publish-subscribe model?

Real-time location tracking

Direct communication between two devices

Sending and receiving messages asynchronously

Persistent storage of messages

None

64.

What command is used to insert a document into a collection in MongoDB?

db.collection.put()

db.collection.insertDocument()

db.collection.add()

db.collection.insertOne()

None

65.

Which IoT board is best suited for low-power, battery-operated applications?

Arduino Uno

Raspberry Pi

BeagleBone Black

ESP32

None

66.

How do you Apply Middleware to Specific Routes in Express.js?

By passing it as an argument to the route handler function

By using the app.route() method

By using the app.use() method

By using the app.use() method with a path argument

None

67.

What is the primary advantage of a doubly linked list over a singly linked list?

Easier insertion and deletion from both ends

Faster searching

Uses less memory

Easier implementation

None

68.

What is Babel?

JavaScript transpiler

None of the above

JavaScript interpreter

JavaScript compiler

None

69.

How does std::unique_ptr differ from std::shared_ptr?

std::shared_ptr allows multiple ownership of an object

std::unique_ptr allows multiple ownership of an object

Both allow multiple ownership

None of the above

None

70.

What does LPWAN stand for in IoT networks?

Low Power Wireless Access Network

Low Power Wide Area Network

Low Protocol Wireless Access Network

Long Protocol Wireless Area Network

None

71.

Which programming language is most commonly used for IoT firmware development?

C/C++

Ruby

Java

Python

None

72.

Which of the following is an advantage of using interrupts in Embedded C?

Increases power consumption

Reduces code size

Avoids all hardware failures

Reduces response time to external events

None

73.

What is the primary role of a gateway in an IoT ecosystem?

To connect IoT devices to external networks

To encrypt all IoT data

To update software on IoT devices

To manage IoT device energy consumption

None

74.

When is useReducer used over useState in React component?

When we want to break our production app

none of the above

When we want to replace redux

When we want to improve performance

None

75.

The prefix form of A-B/(C*D^E) is?

-A/B*C^DE

-A/BC*^DE

-/*^ACBDE

-ABCD*^DE

None

76.

How do we send the message from one socket to another socket in Node.js?

socket.get()

socket.post()

socket.send()

socket.ref()

None

77.

Which of the following is used to access a function fetch() from h1 element in JSX?

${fetch}

{fetch}

{fetch()}

${fetch()}

None

78.

What is the best-case time complexity of Quick Sort?

O(log n)

O(n)

O(n log n)

O(n^2)

None

79.

Which of the following traversal techniques visits nodes level by level in a tree?

Inorder Traversal

Depth First Search

Breadth First Search

Preorder Traversal

None

80.

What will be the output of the following code snippet? std::string s = "Hello"; std::reverse(s.begin(), s.end()); std::cout

olleH

Compilation error

Undefined behavior

Hello

None