Interview Questions

Q:

How does an application run in isolation from other applications?

Answer

Each application gets its own Linux user ID and virtual machine which means that the application code runs in isolation from other applications.

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Q:

If super class ref is pointing sub class object then by using super class ref is it possible to call sub class newly defined method?

Answer

yes if the method is ovreriding method


no if the method is not overriding method

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Subject: Java

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Q:

What are the usages of the Command object in ADO.NET?

Answer

The following are the usages of the Command object in AD0.NET:

The Command object in AD0.NET executes a command against the database and retrieves a DataReader or DataSet object.

  =>  It also executes the INSERT, UPDATE, or DELETE command against the database.
  =>  All the command objects are derived from the DbCommand class.
  =>  The command object is represented by two classes: SqlCommand and OleDbCommand.
  =>  The Command object provides three methods to execute commands on the database:
  =>  The ExecuteNonQuery() method executes the commands and does not return any value.
  =>  The ExecuteScalar() method returns a single value from a database query.
  =>  The ExecuteReader() method returns a result set by using the DataReader object.

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Subject: .NET

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Q:

What computer skills do you have?

Answer

Here by this question the employer need to know do you have any computer skills for managing an admin's job.


 


Example Answer :


I'm proficient with Microsoft Office suite including Word, Excel, and Power Point. I'm very comfortable using these programs and have a lot of experience doing so in my previous job roles.

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Q:

What are new Media Elements in HTML5?

Answer

Following are the New Media Elements are present in HTML5:


<audio> tag: for playing audio.


<video> tag: for playing video.


<source> tag: For media resources for media elements.


<embed> tag: For embedded content


<track> tag: For text tracks used in media players

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Q:

What are the uses of synonyms?

Answer

- Mask the real name and owner of an object.
- Provide public access to an object
- Provide location transparency for tables, views or program units of a remote database.
- Simplify the SQL statements for database users.

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Subject: Oracle

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Q:

What is the TTL (Time to Live)? Why is it required?

Answer

TTL is a value in data packet of Internet Protocol. It communicates to the network router whether or not the packet should be in the network for too long or discarded. Usually, data packets might not be transmitted to their intended destination within a stipulated period of time. The TTL value is set by a system default value which is an 8-bit binary digit field in the header of the packet. The purpose of TTL is, it would specify certain time limit in seconds, for transmitting the packet header. When the time is exhausted, the packet would be discarded. Each router receives the subtracts count, when the packet is discarded, and when it becomes zero, the router detects the discarded packets and sends a message, Internet Control Message Protocol message back to the originating host.

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Q:

Explain the changing file permission and ownership using PHP's chmod() function.

Answer

Chmod() is used for changing permissions on a file.


Syntax:


Chmod(file, mode)


Mode here specifies the permissions as follows:


The first number is always zero


The second number specifies permissions for the owner


The third number specifies permissions for the owner's user group


The fourth number specifies permissions for everybody else


Possible values (to set multiple permissions, add up the following numbers)


1 = execute permissions


2 = write permissions


4 = read permissions


Example:


// everything for owner, read for owner's group


chmod("test.txt",0740);

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Subject: PHP

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