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Embedded Systems Online Exam

Welcome to your Embedded Systems General Question

Name

Phone

Qualification

Place

What will printf("%c", 100); print?

prints 100

print garbage

prints ASCII equivalent of 100

None of the above

None

What does the `grep` command do?

Deletes files

Searches text

Moves files

Lists directories

None

In C, the FILE data type is defined as

int

char *

struct

None of the mentioned

None

In a robot, which motor type provides precise angular position control?

Stepper motor

DC motor

Servo motor

Both a and c

None

What does the following code output?

cpp
#include
#include
int main() {
std::string str("AdvancedCpp");
str.back() = '!';
std::cout << str << std::endl;
return 0;
}

AdvancedCpp

AdvancedCpp!

AdvancedCp!

AdvancedCpp!!

None

Consider the program

void fun(char *q)

{

if(*q != 'r') {

putchar(*q);

fun(q++);

}

main()

{

char p[] = "abcder";

fun(p);

}

The output for this program

abcde

abcder

stack overflow

abc

None

Consider the program

/* temp.c*/

main (int argc, char *argv[])

{

If(argc == 1)

return;

printf(“%c”, *(argv[1] + 1));

printf(“%c”, (*(argv+ 1))[2]);

printf(“%c”, argv[1][2]);

}

output for this program is if input is given as $ ./tmp 3579

5 7 7

5 7 9

3 5 7

7 7 9

None

Guess Output:

#include
using namespace std;
class Base {
public:
virtual void show() { cout << "Base"; }
};
class Derived : public Base {
public:
void show() { cout << "Derived"; }
};
int main() {
Base b, *ptr;
Derived d;
ptr = &d;
ptr->show();
}

1The function of the Watchdog Timer is to

Reset system on hang

Increase clock speed

Manage power

Count instructions

None

Which of the following describes a template with a variable number of arguments?

Template with fixed arguments

Template with variable number of arguments

Template that cannot accept arguments

Template for function pointers

None

Which of the following best defines a functor in C++?

A pointer to a function

A preprocessor macro

A lightweight function object defined inline

An anonymous function

None

What is the output of the following code?

c
#include
int main() {
    int x = 5;
    int y = (x++) + (++x);
    printf("%d", y);
    return 0;
}

None

What is the main controller unit in most mobile robots?

Microcontroller

Power supply

Wheel encoder

Sensor module

None

In robotics, which sensor is commonly used for obstacle detection?

Ultrasonic sensor

LDR sensor

Humidity sensor

Temperature sensor

None

A semaphore is used for

Memory allocation

Synchronization

File management

Interrupt handling

None

Which of the following is not a microcontroller?

8051

ATmega328

ARM Cortex-M4

Pentium i5

None

Which command is used to create a simple automation script in Linux?

nano script.sh

touch automation.sh

chmod script.sh

echo script

None

Which mechanism allows capturing variables from the enclosing scope in a lambda expression?

Capturing runtime errors

Capturing screenshots in a GUI app

Capturing user input

Capturing variables from the enclosing scope

None

In C++, what does the mutable keyword indicate?

Specifies that a pointer is not null

Variable can be modified by external sources

Function is pure virtual

Function is inline

None

Which hardware support improves AI and automation performance on Linux?

GPU drivers

Mouse drivers

File handlers

Font manager

None

Consider this program

#define INT_PTR int *

main()

{

INT_PTR aptr, bptr;

}

Select appropriate answer:

only aptr is pointer

only bptr is pointer

both aptr and bptr are pointer

None of the variable is pointer

None

What is the use of std::move in C++?

Moves the contents of one container to another

Moves the ownership of a resource from one object to another

Moves the iterator to the next element in a container

Moves the cursor position in a file

None

The time taken by a system to respond to an interrupt is called

Response time

Latency

Context time

Switching delay

None

Which function is used to modify the previously allocated space in memory?

calloc

free

malloc

realloc

None

Consider the program main

main ()

{

double a[2][3];

printf("%d ", sizeof(a));

printf("%d ", sizeof(a[1]));

printf("%d ", sizeof(a[1][1]));

}

The output for this program:

48 8 8

48 48 48

40 40 8

48 24 8

None

Consider the program

void fun(int b[][3])

{

++b;

b[1][1] = 9;

}

main()

{

int a[3][3] = {{1,2,3}, {4,5,6}, {7,8,9}};

fun(a);

printf("%d", a[2][1]);

}

The output for this program

compilation error

None

Which signal is used to terminate a process?

SIGSTOP

SIGTERM

SIGCONT

SIGALRM

None

Which of the following statements about pointers is correct?

Pointers store values directly

Pointers hold addresses of variables

Pointers can be dereferenced to get the value

Both b and c

None

Flash memory in a microcontroller is used to store

Temporary data

Program code

CPU registers

Stack contents

None

In a preemptive RTOS, when a higher-priority task becomes ready, the kernel:

Waits for the current task to finish its time slice

Immediately preempts the current running task

Schedules the higher-priority task in the next cycle

Delays execution until the idle task completes

None

What is a correct statement about std::async?

Executes a function asynchronously and returns a future object for the result

Executes synchronously and returns the result immediately

Executes asynchronously without returning a result

Executes synchronously and waits for user input

None

Which scheduling algorithm is commonly used in RTOS?

Round Robin

Priority-based

Shortest Job First

FIFO

None

What is a move constructor in C++?

Constructor that moves an object from one memory location to another

Constructor that initializes objects using another object’s memory

Constructor auto-generated by the compiler

Constructor that accepts rvalue references as arguments

None

Which statement about smart pointers is correct?

A variable pointer that auto-increments itself

A pointer that deallocates the allocated memory when no longer required

A pointer that is auto-undefined and points to nullptr

A pointer that can’t be dereferenced

None

Which of these is NOT a valid C++ cast?

What would be the output of the following code?

c
#define call(x) #x
void main() {
printf("%s", call(c/c++));
}

c++

#c/c++

c/c++

Compiler error

None

What is the output of the following code?

c
int main() {
int a = 42;
int *p = &a;
printf("%d", *p++);
return 0;
}

Garbage value

Address of a

Compile error

None

How many null branches does a binary tree with 27 nodes have?

None

What is the output of this code?

c
if(printf("cquestionbank"))
printf("I know c");
else
printf("I know c++");

I know c

I know c ++

cquestionbankI know c

cquestionbankI know c++

Compiler error

None

Which OS feature helps run AI or automation tasks efficiently?

Multitasking

File management

Printing

Text editing

None

A daemon process is:

Background process

Virus

Kernel panic

Driver error

None

Consider the program

main()

{

float a[10][10];

float *p, *q;

float *e, *f;

p= &a[5][8];

q= &a[10][9];

e = p-q + a; //exp1

f = a + p-q; //exp1

}

Which one is the right expression

only exp1 is right

only exp2 is right

both 1 and 2 are right

Neither 1 nor 2 is right

None

Priority inversion occurs when:

High-priority task waits for a low-priority task

Low-priority task preempts a high-priority task

Equal priority tasks execute together

None

Guess Output:

#include
using namespace std;
void fun(int &x) { x = 20; }
int main() {
const int a = 10;
fun((int&)a);
cout << a;
}

main()

{

struct data {

int a;

int b;

int c;

};

struct data d = {3, 5, 6};

struct data *dp = &d;

printf("%d", *(int *)dp);

}

The output for this program

None

What does the sizeof(char) operator return in a 32-bit compiler?

None

What does the explicit keyword in a constructor declaration in C++ do?

Specifies that a function cannot be overridden

Specifies that a constructor cannot be called implicitly

Specifies that a function should be inlined

Specifies that a variable cannot be modified

None

Which RTOS feature helps AI run predictably?

Task scheduling

File management

Screen refresh

Memory paging

None

Which command is used to execute a shell script?

./script.sh

run script.sh

exec script.sh

start script

None

What is the size of an empty class in C++?

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