Web Technology Questions

Q:

Server control events are handled in the server whereas HTML control events are handled in the page

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Server control events can be handled inside a server itself

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Q:

How would you automatically transfer your visitors to a new web page?

Answer

- You can do it with the help of meta tag mentioned below: 


<META HTTP-EQUIV="Refresh" CONTENT="2"; URL="https://www.yourname.com"> 


- Place this tag between <HEAD></HEAD> . 


- It will load yousite.com in 2 seconds.

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Q:

Write a c program for bubble sort.

Answer

#include<stdio.h>
int main(){

  int s,temp,i,j,a[20];

  printf("Enter total numbers of elements: ");
  scanf("%d",&s);

  printf("Enter %d elements: ",s);
  for(i=0;i<s;i++)
      scanf("%d",&a[i]);

  //Bubble sorting algorithm
  for(i=s-2;i>=0;i--){
      for(j=0;j<=i;j++){
           if(a[j]>a[j+1]){
               temp=a[j];
              a[j]=a[j+1];
              a[j+1]=temp;
           }
      }
  }

  printf("After sorting: ");
  for(i=0;i<s;i++)
      printf(" %d",a[i]);

  return 0;
}

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Q:

Explain what is injector ?

Answer

1.  An injector is a service locator.
2.  It is used to retrieve object instances as defined by provider, instantiate types, invoke methods and load modules.
3. There is a single injector per Angular application, it helps to look up an object instance by its name.

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Q:

Distinguish between Static vs. Dynamic HTML

Answer

- The easiest difference is static HTML once rendered cannot be changed on the other hand dynamic HTML can be changed.


- Static web pages cannot have database access but dynamic pages can be connected to database.


- Using static HTML no interactions persist between user and server but dynamic HTML has capability to interact with the user.


- Static HTML does not require server side coding but dynamic HTML requires server side coding.


- No animation, games can be developed using the static HTML but on the other hand dynamic HTML can perform this task.

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Q:

How JavaScript timers work? What is a drawback of JavaScript timers?

Answer

Timers allow you to execute code at a set time or repeatedly using an interval. This is accomplished with the setTimeout, setInterval, and clearInterval functions. The setTimeout(function, delay) function initiates a timer that calls a specific function after the delay; it returns an id value that can be used to access it later. The setInterval(function, delay) function is similar to the setTimeout function except that it executes repeatedly on the delay and only stops when cancelled. The clearInterval(id) function is used to stop a timer. Timers can be tricky to use since they operate within a single thread, thus events queue up waiting to execute.

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Q:

How does Node.js prevents blocking code?

Answer

By providing callback function. Callback function gets called whenever corresponding event triggered.

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Q:

What do you mean by undeclared and undefined variables ?

Answer

Difference between undeclared and undefined variables is defined as


Undeclared variables are those that do not exist in a program and are not declared. If the program tries to read the value of an undeclared variable, then a runtime error is encountered.


Undefined variables are those that are declared in the program but have not been given any value. If the program tries to read the value of an undefined variable, an undefined value is returned.

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