Perpetuuiti Technosoft Services Interview Questions, Process, and Tips

Basic aptitude and reasoning questions

Q1. What are the used commands in linux?
Ans. 
Linux commands are used to interact with the operating system and perform various tasks.
• ls - list directory contents

• cd - change directory

• mkdir - make directory

• rm - remove file or directory

• cp - copy file or directory

• mv - move or rename file or directory

• grep - search for a pattern in a file

• chmod - change file permissions

• sudo - execute a command as superuser

• apt-get - package manager for Debian-based systems
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Q2. What is server and types of server.
Ans. 
A server is a computer program or device that provides functionality to other programs or devices, known as clients.
• Types of servers include file servers, web servers, mail servers, database servers, game servers, and application servers.

• File servers store and manage files for multiple users on a network.

• Web servers host websites and web applications.

• Mail servers handle email communication.

• Database servers manage datab...read more
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Q1. What is Manage and unmanaged code
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Managed code is code that is executed by the Common Language Runtime (CLR) while unmanaged code is code that is executed outside of the CLR.
• Managed code is written in high-level languages like C# or VB.NET and is compiled to Intermediate Language (IL) which is then executed by the CLR.

• Unmanaged code is written in languages like C or C++ and directly compiled to machine code which is executed by the operating system.

• Man...read more
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Q2. Boxing vs unboxing
Ans. 
Boxing is the process of converting a value type to a reference type, while unboxing is the opposite process.
• Boxing is implicit, unboxing is explicit

• Boxing creates a new object on the heap, unboxing retrieves the value from the object

• Boxing is slower than unboxing

• Example: int num = 10; object obj = num; // boxing

• Example: int num = (int)obj; // unboxing
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Q3. What is Trigger?
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A trigger is a special type of stored procedure that automatically executes when an event occurs in the database.
• Triggers are used to maintain the integrity of the database by enforcing business rules or cascading changes.

• They can be set to execute before or after an INSERT, UPDATE, or DELETE operation.

• For example, a trigger can be used to update a related table when a record is inserted into another table.
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Q1. What is Cursor, index, trigger. Write syntax
Ans. 
Cursor, index, and trigger are database concepts used in SQL. Cursors are used to retrieve data row by row, indexes are used to improve query performance, and triggers are used to automatically perform actions when certain events occur.
• Cursor: Used to retrieve data row by row. Syntax - DECLARE cursor_name CURSOR FOR SELECT column1, column2 FROM table_name

• Index: Used to improve query performance by creating a data struc...read more
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Q2. What is abstract class, method overriding, dictionary,dispose. Write instance or syntax
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Abstract class is a class that cannot be instantiated, method overriding is when a subclass provides a specific implementation of a method in its superclass, dictionary is a collection of key-value pairs, dispose is a method used to release unmanaged resources.
• Abstract class: Cannot be instantiated, can have abstract methods. Example: abstract class Shape { public abstract void Draw(); }

• Method overriding: Subclass prov...read more
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Q1. Basic manual testing ques, Selenium and java
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Q1. What is lvm What did you you about linux
Ans. 
LVM stands for Logical Volume Manager. It is a tool used in Linux to manage disk space by creating logical volumes.
• LVM allows for dynamic resizing of logical volumes without the need to unmount the file system

• It provides a layer of abstraction between the physical storage devices and the file systems

• LVM can be used to create snapshots of logical volumes for backup purposes

• It is commonly used in enterprise environments
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Q2. How to make partition
Ans. 
To make a partition, you need to use a disk management tool or command prompt.
• Open Disk Management tool or Command Prompt

• Select the disk you want to partition

• Right-click on the unallocated space and select 'New Simple Volume'

• Follow the wizard to specify the size and format of the partition

• Alternatively, use the 'diskpart' command in Command Prompt to create a partition
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