You want to use nodemon to watch the node_modules directory for a certain project. However, you do not want this config to affect your other projects.

Which of the following would be an appropriate way to do so in the given scenario?

Options

1. Override the ignoreRoot config in your local nodemon.json
2. Override the ignoreRoot config in your $HOME/nodemon.json
3. Override the watchmodule config in your local nodemon.json
4. Override the watchmodule config in your $HOME/nodemon.json

Each request to a web server takes 40 ms to complete, and 35ms of that 40ms is database I/O that can be done asynchronously.

Which of the following operations will you use if you want that 35ms per request to get freed up to handle other requests?

Options

1. Non-blocking asynchronous operations
2. Blocking asynchronous operations
3. Non-blocking synchronous operations
4. Blocking synchronous operations

You need to (hypothetically) find a certain temporary file of your application using npm. Assuming that the default locations were used, which of the following environment variables determines where the file is?

Options

1. TMPDIR
2. TMP
3. TEMP
4. Any of the above

You want to override the default behaviour of the REPL evaluation function used in Node. Which of these would you add the alternative evaluation function to in the given scenario?

Options

1. repl.REPLServer
2. Config.REPLServer
3. Socket.REPLServer
4. override.REPLServer

In the given code snippet, you have to replace XXXXX with a certain method to get the desired output.

function timerExample() {

console.log('Time!');

}

XXXXX(tierExample, 1000);

What is the correct combination of the method and desired output by substituting that method in place of XXXXX?

Options

1.XXXXX - setTimeout()

Result - timerExample() will execute after any I/O operations(if used) in the current event loop

2.XXXXX - setinterval()

Result - timerExample() will execute about every 1 second until it is stopped

3.XXXXX - setTimeout()

Result - timerExample() will execute as close to 1000 millisecond

4.XXXXX - process.nextTick()

Result - timerExample() will execute as close to 1000 millisecond

On a Windows machine that has gitbash, you would like to generate an SSH key and add it to the ssh agent for Github. What would be your first command after generating and saving the key?

Note: id_rsa is a key name

Options

1. ssh-add ~/.ssh/id_rsa
2. eval $(ssh-agent -s)
3. ssh-keygen -t rsa -b 4096
4. None of the above

A piece of code is scheduled to execute after a designated amount of time. You realize that execution needs to be cancelled.

If used for scheduling the code execution, which of the following would prevent cancelling the same?

Options

1. setInterval()
2. setImmediate()
3. process.nextTick()
4. setTimeout()

In the process of creating a scoped public package, you have created a scoped package that has the user scope. What command would you use to publish this?

Note: username is "username"

Options

1. npm publish --access public
2. npm publish --access username
3. npm publish --scope username -access public
4. npm publish ---scope=@username -access public

Which of these are likely to be returned by the method shown below if the callback parameter of the argument list is omitted?

query (command, [callback])

Options

1. Await
2. Promise
3. Resultset
4. This will result in compile time error

In Node.js, you use the .pipe() function to transfer data from one process to another. Unfortunately, the write queue is currently busy and so .write() returns a false value.

Which of the following events will be emitted once the data buffer is emptied to resume the incoming data flow in this situation?

Options

1. .drain()
2. .read()
3. .transform()
4. .duplex()

ou want to generate a list of words while working with Elixir.

Which of the following sigils can be used to achieve this?

Options

1. ~c
2. ~s
3. ~w
4. ~r

Determine the output of the given code snippet in Elixir.

[head | _] = [3,6,9] #line1

head * 2 #line2

_ * 3 #line3

Options

1.[6,12,18]

[9,18,27]

2.[3,6,9]

[3,6,9]

3.Compilation error at line 1

4.Compilation error at line 2

5.Compilation error at line 3

What happens when following line of code is run in Elixir?

length([1, [2], 3]) = 3

Options

1. All values of length will be set to 3.
2. A Compile Error is thrown
3. A Match Error is thrown
4. The first value of length is set to 3

Which of these callbacks can be used to verify the arguments given to the provider and prepare the state that will be given to load/2?

Options

1. init/1
2. init/3
3. link/3
4. spawn/1

Which of the following files need to be edited to include the crypto module in Elixir?

Options

1. mix.exs
2. mix.logger
3. mix.repo
4. mix.store

You have created two callbacks X and Y in Elixir. You now want to annotate X and Y to inform the compiler that your intention for the subsequent function definition is to define a callback.

Which of these annotations should you use to achieve this?

Options

1. @impl true
2. @impl false
3. @doc
4. @impl doc
5. @doc true

What does the following configuration file do when implemented in Logger?

config :logger,

compile_time_purge_matching: [

[application: :abc],

[module: Sample, function: "abc/3", level_lower_than: :error]

]

Options

1. It purges all log calls from an application named :abc.
2. It only keeps errors from Sample.abc/3
3. Both Choice 1 and 2
4. It does not do anything.

What can be said about the codes A and B given below?

A:

[1, [2], 3]

|> List.flatten()

B:

[1, [2], 3]

v() |> List.flatten()

Options

1. Both A and B are equivalent.
2. Both A and B are not equivalent.
3. A will run without error but B will throw errors.
4. B will run without error but A will throw errors.

Analyze the snippet given below and determine its output.

{a, a} = {4, 7}

Options

1. 4
2. 7
3. 11
4. A (MatchError) will occur

You have set the following configuration via config files before the :logger application is started.

:compile_time_purge_matching

What will happen to logger calls with a level lower than the above given option?

Options

1. They will be completely removed at compile time.
2. They will cause overhead during runtime.
3. They will be ignored during runtime.
4. None of these

You have a table ABC with columns a and b. You now want to use a multiple-argument aggregate function to display a in descending order of b. To do this, you have written the following two queries.

A:

SELECT string_agg(a, ',' ORDER BY b) FROM ABC;

B:

SELECT string_agg(a ORDER BY b, ',') FROM ABC;

Which of these queries is an incorrect way to implement the given objective?

Options

1. Only A
2. Only B
3. Both A and B
4. Neither A nor B

You want to update existing rows of a column using the UPDATE command. Which of these informations is/are mandatory when doing this?

1. The name of the table and column to update.

2. The new value of the column.

3. The rows that need to be updated.

Options

1. Only 1 and 3
2. Only 2 and 3
3. All 1, 2 and 3
4. Insufficient information

How does PostgreSQL link rows in separate tables?

Options

1. It uses foreign key and primary key linking in its internal system tables
2. it uses a JSON file to store the links
3. It uses reverse indexing
4. None of these

Assume that you have turned off autocommit and just done one commit at the end when performing multiple INSERTs.

In the given scenario, what will PostgreSQL do if the insertion of one row fails?

Options

1. The insertion of all rows inserted up to that point would be rolled back.
2. PostgreSQL only loads partial data.
3. All insertions are discarded.
4. None of these

You have opened a cursor variable and given it a specific query to execute as follows:

OPEN curs1 FOR EXECUTE format('SELECT * FROM %I WHERE col1 = $1',tabname) USING keyvalue;

Which of the following can be inferred from the given statement?

Options

1. The table name is inserted into the query via format() and comparison value for col1 is inserted via a USING parameter.
2. The table name is inserted into the query via format() along with the comparison value for col1.
3. The table name is inserted into the query along with the comparison value for col1 is inserted via a USING parameter.
4. The table name is inserted into the query via a USING parameter.

Assume that you are using the following command to convert a column to a different data type.

ALTER TABLE products ALTER COLUMN price TYPE numeric(10,2);

Which of these choices is/are TRUE in the given scenario?

Options

1. This will succeed only if each existing entry in the column can be converted to the new type by an implicit cast.
2. PostgreSQL will attempt to convert the column's default value (if any) to the new type, as well as any constraints that involve the column.
3. Both Choice 1 and 2
4. None of these

You come across the following query when working in PostgreSQL.

SELECT a FROM b UNION SELECT x FROM y LIMIT 10

Which of these choices correctly depicts how this query is evaluated?

Options

1. It is evaluated as (SELECT a FROM b UNION SELECT x FROM y) LIMIT 10
2. It is evaluated as SELECT a FROM b UNION (SELECT x FROM y LIMIT 10)
3. It throws a syntax error
4. It throws a runtime error

You are inserting a lot of data at the same time into your table when working with PostgreSQL. You want to do this in the most efficient way possible.

Which of these commands will help you achieve your objective?

Note: You can ignore the flexibility of the command.

Options

1. COPY command
2. INSERT command
3. UPDATE command
4. Both Choice 1 and 2
5. Both Choice 2 and 3

Which of these commands can you use to check whether PostgreSQL service is running on Linux machines(Ubuntu destro)?

Options

1. sudo service status -postgresql
2. sudo service postgresql status
3. sudo service postgresql -all
4. sudo service postgresql -status

You are analyzing the REST Architecture of a system. In the given context which of these benefits would you attribute to cache constraints?

1. Improved efficiency

2. Improved scalability

3. Improved user-perceived performance

Options

1. Only 1
2. Only 2
3. Only 3
4. Only 1,2
5. All 1,2,3

Predict the output of the following code snippet.

#include<iostream>
using namespace std;
class A
 { 
 public: 
 virtual void function1() {cout<<"A :: function1()\n";}; 
 virtual void function2() {cout<<"B :: function2()\n";}; 
 virtual ~A(){};
}; 
 
class B: public A 
{ 
public: 
 ~B(){};
 virtual void function1_virtual() 
 { 
 cout<<"B :: function1()\n";
 
 }; 
	
}; 

int main() 
{ 
	B *b = new B; 
	A *a = b; 
	a->function1();
 a->function2();
 delete (a);
 
 return (0);
}

Options

1. A :: function1()
2. B :: function2()
3. A :: function1(),B :: function2()
4. B :: function2(),A :: function1()

It is given that resource acquisition fails when using the Resource Acquisition Is Initialization in C++.

What happens to all resources acquired by every fully-constructed member and base subobject as a result of this?

Options

1. They are released in reverse order of initialization.
2. They are released in reverse order of acquisition
3. They are destroyed
4. None of these

You want to prevent unrecoverable destruction of resources when working with the move assignment operator in C++.

Which of these actions if taken will help you achieve this?

Options

1. Properly handle self-assignment in the move assignment operator.
2. Free resources such as memory and file handle.
3. Provide move constructor along with the move assignment operator
4. None of these

You want to use the resource via an instance of a RAII-class. In which of the given scenarios can this be achieved?

1. The RAII-class has automatic storage duration.

2. The RAII-class has lifetime that is bounded by the lifetime of an automatic object.

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

//Line1
template <class T>
class mycontainer {
 //some code
};

// Line2
template <>
class mycontainer <char> {
 char element;
 public:
 mycontainer (char arg) {element=arg;}
 //some code
};

Analyse the code snippet given above and choose the correct inferences that can be made.

Options

1. Line 2 defines the class template specialization
2. Line1 defines the class template specialization
3. Line 2 defines the generic class template
4. Both L1 and L2 are part of the class template specialization

Which of these code snippets are valid examples of rvalue expressions in C++?

1.

int a;
int& sample () 
{
 return a;
}
 
sample() = 1;

2.

int a;
int sample ()
{
 return a;
}
sample;

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

Predict the output of the following code snippet.

using namespace std;
class A
{
 public:
 ~A() 
 {
 cout << "Destructor of class A\n"; 
 }
};
class B:public A
{
 public:
 ~B() 
 { 
 cout<< "Destructor of class B\n"; 
 }
}; 
int main()
{
 A* a = new B; 
 delete a;
}

Options

1. Destructor of class A
2. Destructor of class B
3. Destructor of class ,Destructor of class B
4. Destructor of class B,Destructor of class A

You want to use the accumulate function of the <numeric> header in C++ to return the result of accumulating all the values in the range [first,last) to init.

Which of these code snippets is equivalent to the behaviour of the accumulate function?

Options

1.template <class InputIterator, class T>
 T accumulate (InputIterator first, InputIterator last, T init)
{
 while (first!=last) {
 init = init + *first; ++first;
 }
 return init;
}
2.template <class InputIterator, class T>
 T accumulate (InputIterator first, InputIterator last, T init)
{
 while (first!=last) {
 init=binary_op(init,*first)
 ++first;
 }
 return init;
}
3.Both 1 or 2

4.None of these

Which of these lambda expressions can be used in place XXX to produce the output as 18?

#include 
 
int main()
{
 using namespace std;
 
 XXX
 
 cout << result << endl;
}

Options

1.int result = [](int x) { return [](int y) { return y * 3; }(x) + 3; }(5);

2.int result = [](int x) { (int y) { return y * 3; }(x) + 3; }(5);

3.Either 1 or 2

4.Neither 1 nor 2

Analyse the code snippet given below and choose the correct option.

void funtion1(int (*)(int)) {}
void function2(char (*)(int)) {}
void function3(int (*)(int)) {} // #1
void function3(char (*)(int)) {} // #2
auto samplelambda = [](auto a) { return a; };
function1(samplelambda); // Line1
function2(samplelambda); // Line2
function3(samplelambda); // Line3

Options

1. Line 2 and Line 3 will throw an error
2. Only Line 2 will throw an error
3. Only Line 3 will throw an error
4. Only Line 1 and Line 3 will throw an error

Which of the following statements regarding OOPS in PHP is/are true?

S1: __construct() function is used to define constructor in PHP.

S2: While writing a code in PHP to provide a common function names to the implementers you may use interfaces.

Options

1. $1
2. $2
3. $1 and $2
4. None

You want to delete or flush all the files from a particular folder location using PHP.

Which of these code snippets can be used to achieve this objective?

Note: Assume folder path is “path/to/temp/”.

Options

1.$files = glob('path/to/temp/*');

foreach($file in $files){

if(is_file($file))

unlink($file);

}

2.$files = glob('path/to/temp/*');

foreach($files as $file){

if(is_file($file))

unlink($file);

}

3.$files = glob('path/to/temp/*');

foreach($files as $file){

if(is_file($file))

delete($file);

}

4.$files = glob('path/to/temp/*');

foreach($file in $files){

if(is_file($file))

delete($file);

}

Analyze the below given snippet and choose the most optimized version that executes the similar functionality.

for( $i=0; i< count($arrB); $i++){

echo count($arrB);

}

Options

1.for( $i=0; i< $len; $i++){

$len = count($arrB);

echo $len;

}

2.$len = count($arrB);

for( $i=0; i< $len; $i++){

echo $len;

}

3.While( $i< $len){

$len = count($arrB);

echo $len;

$i++;

}

4.for( $i=0; i< $len; $i++){

$len = count($arrB);

}

echo $len;

}

Assume that you have used a finally block after a try-catch block when working in PHP. In which of the given scenarios will the finally block NOT be executed?

1. A return statement is encountered inside either the try or the catch blocks.

2. The finally block contains a return statement.

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

Predict the output of the following code snippet.

<?php

function sample() {

try {

throw new Exception('Hello World');

} catch (Exception $e) {

return 'catch';

} finally {

return 'finally';

}

}

echo sample();

?>

Options

1. Hello World
2. catch
3. finally
4. None of these

Predict the output of the following code snippet.

<?php

$a = array(

0=>"ONE",

2=>"TWO");

$b = array(

1=>"Three",

2=>"Four");

foreach(($a + $b) as $key=>$value)

{

print("$key: $value\n");

}

?>

Options

1.0: ONE

2: TWO

1: THREE

2: TWO

2.0: ONE

2: TWO

1: THREE

2: FOUR

3.0: ONE

2: TWO

1: THREE

4.None of these

You have created a backed enum "Fruit" as follows in PHP.

<?php

enum Fruit: string

case Apple = 'A';

case Lemon = 'L';

case Orange = 'O';

case Tomato = 'T';

}

?>

In the given context, what will happen if a variable is assigned as a reference to the backed case Lemon?

Options

1. The value property of Lemon is enforced to be read-only
2. The following error is thrown:
3. Error: Cannot acquire reference to property Fruit::$value
4. The value L is printed
5. A ValueError is thrown

You have created two classes named A and B such that A is the parent of B. You have also defined a constructor C inside the child class B.

Which of these choices is/are true regarding A's constructor?

Options

1. It is called implicity
2. It is not called implicity
3. It is run insider B
4. None of these

In order to increase security, you have decided to put the PHP parser binary in /usr/local. Which of the following is/are some downsides of doing this?

A. PATH_INFO and PATH_TRANSLATED need to be configured

B. Any file containing PHP tags would need an additional first line

C. Any file containing PHP tags would need to be made executable

Options

1. A
2. A,B
3. B,C
4. A,B,C

You have used the below given method to set the persistence mode for a soap server using PHP 5.

SOAP_PERSISTENCE_SESSION

The persistence of which of the following is/are unlikely to be affected in the given scenario?

1. Objects of the class.

2. Static data member of the class.

Options

1. Only1
2. Only 2
3. Both 1,2
4. Neither 1 nor 2

Predict the output of the following code snippet.

func main() {
 var X interface{}
 
 switch i := X.(type){
 case nil: 
 fmt.Printf("X is :%T",i) 
 case int: 
 fmt.Printf("X is int") 
 case float64:
 fmt.Printf("X is float64") 
 case func(int) float64:
 fmt.Printf("X is func(int)") 
 case bool, string:
 fmt.Printf("X is bool or string") 
 default:
 fmt.Printf("Don't Know") 
 } 
}

Options

1. X is int
2. X is bool or string
3. X is func(int)
4. X is :<nil>

How many times will the "for" loop execute in the following code snippet?

package main
import "fmt"

func main(){
 
 var a int = 2
 var b int = 5
 var expression_1 int
 var expression_2 int
 expression_1 = (5*a - 2*b)
 expression_2 = (4*a + 8*b) % (b-1)

for expression_1 = expression_2 {
 expression_1+= 5
 fmt.Println(expression_1)
 expression_2--
 fmt.Println(expression_2)
 }
}

Options

1. 0
2. 1
3. 2
4. Infinite

You have a Go program that consists of various tokens.

Which of these tokens can you use to recognize a user-defined item?

Options

1. Whitespace
2. Comments
3. Keywords
4. Identifiers

Predict the output of the following code snippet.

func Sqrt(num float64)(float64, error) {
 if(num < 0){
 return 0, errors.New("The result is a Complex Number")
 }
 return math.Sqrt(num), nil
}

func main() {
 output, error:= Sqrt(-4)

 if error != nil {
 fmt.Println(error)
 }else {
 fmt.Println(output)
 }
 
 output, error = Sqrt(256)

 if error != nil {
 fmt.Println(error)
 }else {
 fmt.Println(output)
 }
}

Options

1.2

16

2.16

2

3.Error

4.16

The result is a Complex Number

5.The result is a Complex Number

16

What output will be produced when the following code snippet is executed?

func Sequence() func() int {
 i:= 0
 return func() int {
 i+=1
 return i 
 }
}

func main(){

 num := Sequence() 

 fmt.Println(num())
 fmt.Println(num())
 fmt.Println(num())
 
 num1 := Sequence() 

 fmt.Println(num1())
 fmt.Println(num1())
}

Options

1.1

2

3

1

2

2.0

1

2

0

1

3.1

2

3

4

5

4.0

1

2

3

4

What will be displayed on the screen when the following code snippet is executed?

package main

import "fmt"

func main() {
 
 var X int = 020
 var Y float64 = 10.5
 var Z float64
 
 Z = float64(X)-float64(Y)
 fmt.Println(Z)
}

Options

1. 9.5
2. 4.5
3. 5.5
4. Error

Which of the following intializations will throw an error in Go?

1. a := [...]string {Enone: "no error", Eio: "Eio", Einval: "invalid argument"}

2. m := map[int]string{Enone: "no error", Eio: "Eio", Einval: "invalid argument"}

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

You decide to defer a function call when coding in Go. What is the benefit of doing this?

1. It guarantees that you will never forget to close the file.

2. The parameters of this function are initialized to zero values by default.

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

You are using the following code snippet to loop through an array using for.

sum := 0
XXX, value := range array {
 sum += value
}

What can be used in place of XXX if you need the second item in the range and discard the first?

Options

1.for ?
2.for ;;

3.for _

4.for (;)

Consider the following code snippet.

type SyncedBuffer struct {
 lock sync.Mutex
 buffer bytes.Buffer
}
p := new(SyncedBuffer) 
var v SyncedBuffer 

Which of these deductions can be made about the values p and v?

Options

1. Both p and v will work correctly without further arrangement.
2. Both p and v will NOT work correctly without further arrangement.
3. Only v will work correctly without further arrangement.
4. Only p will work correctly without further arrangement.

You want to run a 802.11 packet injection program while running a exploit using Aircrack.

In the given context, which of these tools provided with Aircrack are you likely to use for this purpose?

Options

1. aireplay
2. airodump
3. airdecap
4. airowiz

Which of these symptoms observed while monitoring telemetry is indicative of a Session Hijacking attempt?

Options

1. Telnet sessions start freezing
2. a sudden burst of network activity for a short period,
3. Repeated ARP updates
4. Choice 1 and Choice 3
5. All of the given options

You have encrypted packets that have been gathered during reconnaissance.

In the given context, which of these tools can be used for cracking the encryption?

Options

1. Aircrack
2. Cain and Abel
3. John the Ripper
4. All of the given options

An OpenSSH server needs to be attacked by loading a user defined library with SSH server rights.

Which of these program executions would be required to successfully perform this attack?

Options

1. /bin/login
2. /bin/RSA
3. /bin/RSA_Generation
4. /bin/Root

Which of the following information can be gathered by performing DNS enumeration on a Network?

1. usernames

2. computer names

3. IP addresses of potential target systems.

Options

1. Only 1,2
2. Only 2,3
3. Only 1,3
4. All 1,2,3

The following IP address in the web logs is found connecting to contiguous ports and each of its connections always have a time_wait status.

192.168.3.4

What kind of attack is the compromised IP executing?

Options

1. DDOS
2. Clickjacking
3. Session hijack
4. XSS

You are using a binary file payload delivery from a FTP server during a bounce attack to breach a network.

Which of these logs would you modify/corrupt to stop the network administrator from identifying the source of the attack?

Options

1. Crash Log
2. Session Log
3. Error Log
4. None of these

You want to perform a reflection-based distributed denial of service (DDoS) attack that turns a small DNS query into a much larger payload.

Which of these extensions to the DNS protocol for a DNS request can be used to do so?

Options

1. EDNS0
2. WDNS8
3. FDNS1
4. KDNS2

Which of the following information can be gathered by performing a NetBIOS Enumeration on a Network?

1. List of computers that belong to a domain.

2. List of shares on the individual hosts on the network.

3. Policies and passwords.

Options

1. Only 1,2
2. Only 2,3
3. Only 1,3
4. All 1,2,3

You want to use the Firewall level detection mechanism to monitor any port scanning activity in a network that needs to be exploited.

Which of these port scanning techniques would you use to infiltrate the network without being detected?

Options

1. SYN Scan
2. ACK SCAN
3. TCP connect()
4. FTP Bounce Scan

A component that uses state has two snippets of code as given here

A

<h1>It is {this.state.date.toLocaleTimeString()}.</h1>

B.

<MyStuff thing={this.state.thing} />

Which of the snippets may lead to issues in the architecture?

Options

1. Both A and B are fine. The children receive the state as props
2. Yes, this is fine for A but not for B since user defined components would have their own state
3. Yes, this is fine for A but not for B since user defined components would have their own stateYes, this is fine for B, but not for A, since the state can be modified in the child with unpredictable consequences
4. No, this is not fine for either A or B since the state may be cascaded and would lead to unpredictable re-rendering

You are using the express-session middleware for cookie session maintenance.

What consideration would you need to take in case you want to use this for a production environment?

Options

1. You should never use it in a production environment
2. You should use an in-memory store in the production environment
3. You should set up a session store for the production environment
4. No changes are necessary

Which of the following code snippets would successfully convert any expression into a delegate?

Options

1.Expression<Func<int>> subtract = () => 4 -3;
var sub = subtract.Compile();
var result = sub(); 
Console.WriteLine(result);
2.Expression<Func<int> subtract ()> => 4 -3;
var sub = compile(subtract);
var result = sub(); 
Console.WriteLine(result);

3.Either 1 or 2

4.None of these

When adding styles to a page, you want to link the CSS file to a page and place the link in the head section of the page after the CSS Link SharePoint control.

In the given scenario, which of these style sheets should you use keeping in mind its ease of maintainance and flexibility?

Options

1. Internal Style Sheets
2. Cascading Style Sheets
3. External Style Sheets
4. None of these

What will be the color of the child p tag contents when the HTML5 snippet given below is rendered?

<p style = "color: green">
        hello 
    <p style = "color: red"> 
            world 
    </p>
</p>

Options

1. green
2. red
3. yellow
4. black

What is the result of compiling and executing the code snippet given below?

1. class Outer_Demo {
2. private int num = 175; 
3. public class Inner_Demo {
4. public int getNum() {
5. 
6. return num;
7. }
8. }
9. }
10.
11. public class My_class2 {
12. public static void main(String args[]) {
13. Outer_Demo outer = new Outer_Demo(); 
14. Outer_Demo.Inner_Demo inner = outer.newInner_Demo();
15. System.out.println(inner.getNum());
16. }
17. }

Options
1.175
2.Compilation error at line 14

3.Compilation error at line 15

4.Runtime error

You are using the following angular code to pass data from parent to child with input binding.

import { Component, Input } from '@angular/core';

import { Hero } from './hero';

@Component({
 selector: 'app-hero-child',
 template: `
 
{{hero.name}} says:

I, {{hero.name}}, am at your service, {{masterName}}.

 `
})
export class HeroChildComponent {
 @Input() hero: Hero;
 XXX
}

What can be used in place of XXX to alias the child component property name masterName as 'master'?

Options

1.@Input('master') masterName;
2.@Input('master') masterName: string;

3.@Input(master) 'masterName';

4.@Input(master:string) 'masterName';

Which of these code snippets can be used to refactor the below given code?

@Component({...})
export class AppComponent implements OnInit {
 @ViewChild('username') input: ElementRef<HTMLInputElement>;

 ngOnInit() {
 console.log(this.input);
 }
}

Options

1.@Component({...})
export class AppComponent implements AfterViewInit {
 @ViewChild('username') input: ElementRef<HTMLInputElement>;

 ngAfterViewInit() {
 console.log(this.input);
 }
}
2.@Component({...})
export class AppComponent implements AfterViewInit {
 @ViewChild('username') input: ElementRef<HTMLInputElement>;

 ngAfterViewInit() {
 console.log(this.input);
 }
}

3.@Component({...})
export class AppComponent implements OnInit {
 @ViewChild('username') input: ElementRef<HTMLInputElement>;

 ngAfterViewInit() {
 console.log(this.input);
 }
}

@Component({...})
export class AppComponent implements OnInit {
 @ViewChildren('username') input: ElementRef<HTMLInputElement>;

 ngOnInit() {
 console.log(this.input);
 }
}

4.None of these

<nav> 
 <a class="button" routerLink="/A-list" routerLinkActive="activebutton">A Center</a> | 
 <a class="button" routerLink="/B-list" routerLinkActive="activebutton">B</a> 
</nav>

Which of the following interferences can be made with respect to the code snippet given above?

1. As you click one of the buttons, the style for that button updates automatically, identifying the active component to the user.

2. By adding the routerLinkActive directive, you inform your application to apply a specific CSS class to the active route.

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Neither 1 nor 2

Which of these deductions can be made from the code snippet given below?

class A
{
{
System.out.println(1);
}
}
class B extends A
{
{
System.out.println(2);
}
}
class C extends B
{
{
System.out.println(3);
}
}
 
class D extends B
{
{
System.out.println(4);
}
}

Options

1. Class A is the only child of class C because it comes after class B and therefore overrides it
2. Class B is a child for two different classes
3. Class B is a parent to both classes C and D
4. Class C is only a parent to class B
5. Class D is a child of class A because it is underneath it

What is the result of compiling and executing the code snippet given below?

1. class Outer_Demo {
2. private int num = 175; 
3. public class Inner_Demo {
4. public int getNum() {
5. 
6. return num;
7. }
8. }
9. }
10.
11. public class My_class2 {
12. public static void main(String args[]) {
13. Outer_Demo outer = new Outer_Demo(); 
14. Outer_Demo.Inner_Demo inner = outer.newInner_Demo();
15. System.out.println(inner.getNum());
16. }
17. }

Options

1. 175
2. Compilation error at line 14
3. Compilation error at line 15
4. Runtime error

You implemented the two functional interfaces, as shown in the Java 8 code snippet given below.

public class University{
@FunctionalInterface
interface TheoryMarks{
abstract float theoryMarks();
 }
@FunctionalInterface
interface PracticalMarks extends TheoryMarks{
abstract float practicalMarks();
public static void printMarks() {
System.out.println("Calculation of marks");
 }}}

However, the code is returning a compilation error. What could be the reason for receiving this compilation failure?

Options

1. Static method is defined after the abstract method
2. A functional interface cannot extend another functional interface
3. The PracticalMarks interface will have two abstract method
4. Methods are not mentioned as public abstract

A component that uses state has two snippets of code as given here

A<h1>It is {this.state.date.toLocaleTimeString()}.</h1>

B.<MyStuff thing={this.state.thing} />

Which of the snippets may lead to issues in the architecture?

Options

1. Both A and B are fine. The children receive the state as props
2. Yes, this is fine for A but not for B since user defined components would have their own state
3. Yes, this is fine for B, but not for A, since the state can be modified in the child with unpredictable consequences
4. No, this is not fine for either A or B since the state may be cascaded and would lead to unpredictable re-rendering

You want to test a component in react in isolation without wrapping it.

What feature of method React.createContext would be useful for testing if it is used to create a context object?

Options

1. The use of the defaultValue argument
2. The ability to pass undefined as a Provider value
3. The ability to assign contextType property
4. None of these

You have to reset some state when a prop changes using the getDerivedStateFromProps(). However, you observe that this make your code verbose.

Which of these steps should you take to avoid this?

Options

1. Make the component fully controlled or fully uncontrolled with a key
2. Use componentDidUpdate lifecycle
3. Use a memoization helper
4. Make the child components to re-render

You are using the following code to extract previous props/state while using hooks(not custom hooks).

function Counter() {
 const [count, setCount] = useState(1);

 X

}

What can be used in place of X to complete it?

Options

1.const prevCountRef = useRef();
 useEffect(() => {
 prevCountRef.current = count;
const prevCount = prevCountRef.current
 });
2.const prevCountRef = useRef();
 useEffect(() => {
 prevCountRef.current = count;
 });
 const prevCount = prevCountRef.current;

3.function usePrevious(value) {
 const ref = useRef();
 useEffect(() => {
 ref.current = value;
 });
 return ref.current;
}

4.function usePrevious(value) {
 const ref = useRef();
 useEffect(() => {
 ref.current = count;
 });
 return ref.current;
}

You have a requirement wherein you have to render a React element into a root DOM node.

What will you pass to the ReactDOM.render() method to do so?

Options

1. React Element
2. Root DOM node
3. Both React element and Root DOM node
4. React element along with an empty text node

Which of these state variable assignments using the state hooks are valid?

A:

 const [item, setItem] = useState(4);

B:

 const [foo, setFoo] = useState('text');

C:

 const [stuff, setStuff] = useState([{ text: 'things' }]);

Options

1. A
2. A,B
3. B,C
4. A,B,C

What can be said about the React v17 code snippet given below?

this.setState({
 counter: this.state.counter + this.props.increment,
});

Options

1. The counter is updated successfully
2. It may fail to update the counter
3. this.state and this.props update synchronously
4. Both Choice 1 and 3
5. Both Choice 2 and 3

Which of the following components declared in React v17.0.1 is pure?

//Function1 
function sub(a, b) {
 return a - b;
}

//Function2 
function del(a, b) {
 at.total -= b;
}

Options

1. Function1
2. Function2
3. Both Function1 and Function2
4. Neither Function1 nor Function2

You have built a component X when working in React. Now, you want to reuse X's logic using a higher order component.

What can you do to achieve this?

Options

1. Modify the input component
2. Use inheritance to copy X's behavior
3. Compose the component 'X' by wrapping it in a container component
4. None of these

Which of the following are valid statements that can be made about the Dependency Injection design pattern?

S1: The injector class of the DI pattern creates an object of the service class.

S2: The DI pattern separates the responsibility of creating an object of the service class out of the client class.

Options

1. Only S1
2. Only S2
3. Both S1 and S2
4. Neither S1 and S2

You are building an Android application in React native.

In the given context, which of these properties can be used to utilize TalkBack to alert the end user when a component changes dynamically?

Options

1. accessibilityViewIsModa
2. accessibilityLiveRegion
3. accessibilityVoiceAlert
4. AccessibilityDetectChange

When building a website using React Native. You want to ensure that when a user presses the back button, the browser pops the item from the top of the history stack, so the active page is the previously visited page.

How can this be accomplished?

1. This can be accomplished using the built-in idea of a global history stack like a web browser does.
2. This can be accomplished using React Navigation

Options

1. Only 1
2. Only 2
3. Both 1 and 2
4. Either 1 or 2

You want to use ImageViews in JavaScript while building an Android application in React native.

Which of these annotations can be used to expose view property setters while doing so?

Options

1. @ReactProp
2. @ReactPropGroup
3. @ReactComponent
4. Only Choice 1 and Choice 2
5. Only Choice 1 and Choice 3

You see margins and padding when you tap on an animated gif in a React native view. Which of these can be used to make live changes to styles in the given context?

1) Built-in inspector

2) Hot reloading

3) React inspector

Options

1. 1,2
2. 2,3
3. 1,3
4. 1,2,3

Read the following statements about touchable highlights and choose the right answer.

1) When a user presses the touchable highlight, it will get lighter and the underlying color will show through.

2) When a user uses touchable native feedback, it will simulate ink animation.

Options

1. Statement 1 is true and statement 2 is false
2. Statement 1 is false and statement 2 is true
3. Both statements are true
4. Both statemnts are false

You are adding alignment to a component's style in React native to determine the alignment of children along the secondary axis.

If you have chosen the alignment as 'stretch', which of the following components will allow the stretch to have an effect?

Options

1. Children having a fixed dimension along the secondary axis
2. Children not having a fixed dimension along the secondary axis
3. Children having a fixed dimension along the primary axis
4. Children having a variable dimension along the primary axis

What can be the most appropriate reason if you are faced with the following error?

> Invariant Violation: Element type is invalid

Options

1. This error occurs when you are trying to use a font that is not bundled with the platfrom
2. This error occurs when Linking has not been completed
3. This error occurs when you are misssing some packages after a git pull
4. This error occurs when trying to import a component that doesn't exist

Which of these StyleSheet API methods in React native can be used to lookup IDs, returned by StyleSheet.register?

Options

1. flatten
2. compose
3. StyleAttributePreprocessor
4. getStyleAttributePreprocessor

The code snippet given alongside is used to detect which platform the React Native application is running on. Which of the given alternative methods can be used for the same purpose?

clickMe() {

var message = ‘';

if(Platform.OS == ‘ios') {

message = ‘Welcome to iOS!';

} else if(Platform.OS == ‘android') {

message = ‘Welcome to Android!';

}

Alert.alert(message);

}

Options

1. You can use the select method
2. You can use the virtual DOM method
3. You can use the render method
4. There is no alternative method

Which of these are valid use cases for React Native - View?

1) View also supports synthetic touch events, which can be useful for different purposes

2) When you need to wrap your elements inside the container, you can use View as a container element

Options

1. 1
2. 21
3. 1 and 2
4. None of these