Cognizant Engineer Trainee Interview Questions and Answers

The operating system in Apple phones is iOS.

• iOS is a mobile operating system developed by Apple Inc.

• It is the second most popular mobile operating system in the world.

• iOS is known for its user-friendly interface and security features.

• Examples of Apple phones that run on iOS are iPhone 12, iPhone 11, and iPhone SE.

Control panel is a device used to control and monitor various systems and processes. It is associated with tasks such as setting parameters, monitoring performance, and troubleshooting.

• Control panel is used to control and monitor various systems and processes

• Tasks associated with control panel include setting parameters, monitoring performance, and troubleshooting

• Examples of control panels include those used in industrial automation, HVAC systems, and electrical power distrib...read more

LAN is used for connecting devices within a small geographic area, such as an office or home.

• Allows for sharing of resources such as printers and files

• Enables communication between devices

• Increases efficiency and productivity

• Examples: Ethernet, Wi-Fi

An IP address is a unique numerical identifier assigned to every device connected to the internet.

• IP stands for Internet Protocol

• It consists of four sets of numbers separated by dots

• Each set can range from 0 to 255

• Example: 192.168.1.1 is an IP address

• It helps in identifying and communicating with devices on the internet

Polymorphism in programming allows objects of different classes to be treated as objects of a common superclass.

• Polymorphism can be achieved in programming languages like Java through method overriding and method overloading.

• Example: In Java, a superclass Animal can have a method 'makeSound()' which is overridden in subclasses like Dog and Cat.

• Example: Method overloading in Java allows multiple methods with the same name but different parameters in a class.

Cloud computing is the delivery of computing services over the internet.

• Cloud computing allows users to access and use computing resources on-demand, such as storage, processing power, and software applications.

• It eliminates the need for users to own and maintain physical infrastructure, as the resources are provided by a third-party service provider.

• Examples of cloud computing services include Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform.

The DATE function in SQL is used to retrieve the current date.

• The DATE function returns the current date in the format 'YYYY-MM-DD'.

• It does not require any parameters to be passed.

• Example: SELECT DATE();