Web Technology Interview Questions and Answers with Explanation

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:

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:

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:

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

- It will load yousite.com in 2 seconds.

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Q:

What does an HTML tag do?

A) It specifies formatting and layout instructions for your web page	B) It hides programming instructions from view
C) It determines the organizational structure of your Web site	D) It connects your web site to an operating environment

Answer & Explanation Answer: A) It specifies formatting and layout instructions for your web page

Explanation:

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Q:

What are meta tags used for?

A) To store information usually relevant to browsers and search engines	B) To only store information usually relevant to browsers
C) To only store information about search engines	D) To store information about external links

Answer & Explanation Answer: A) To store information usually relevant to browsers and search engines

Explanation:

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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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Q:

Explain about struts dispatch action in DHTML

Answer

DispatchAction is an action that comes with Struts 1.1 or later, that let us combine Struts actions into single class, each with their own method. The org.apache.struts.action.DispatchAction class allows multiple operations to map to the different functions in the same Action class.

For e:g; html:hidden property="dispatch" value="error"/>

<SCRIPT>function set(target) {document. forms[0].dispatch. value=target;}</SCRIPT>

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Q:

What is the purpose of Buffer class in Node.js?

Answer

Buffer class could be a global class and may be accessed in application without importing buffer module. A Buffercould be a quite an array of integers and corresponds to a raw memory allocation outside the V8 heap. A Buffer can not be resized.

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