Practice questions, with answers and explanations included

For myString = "Hello World", what does myString.replace('l','*') return?

Explain the syntax and working of the if-else statement in Java with an example (Vote Eligibility Checker).

Half-duplex communication mode allows:

Once the Arrays class has sorted an array, the sort is applied in ascending order by default using Arrays.sort().

Which command is typed in the Command Prompt to check a system's IP address and connection details?

The reach of a PAN typically extends up to 10 meters.

The Integer class and its parseInt() method must be manually imported using the import statement, similar to the Scanner class.

Which command is used at the command prompt to check whether the network card is working, using the loopback address 127.0.0.1?

NIC (Network Interface Card) generally supports full-duplex mode for networking.

Write the two lines of code needed to create a Scanner object that reads from the console and stores a name entered by the user.

The cable that connects the network card in a computer to a network point on the wall is called the:

Data that has not been processed to reveal useful meaning is called:

Write Java code to declare an array of 5 doubles with values {103, 144, 256.5, 346, 387.5}, sort it using the Arrays class, and then print the lowest and highest marks.

If a system shows 'Media State: Media disconnected' after running IPCONFIG, it means the system is connected to the Internet.

Which of the following best describes 'Information'?

An unexpected error situation during program execution that causes it to terminate abnormally is called:

Turning off unused program services from Startup can help speed up a slow computer.

Which of the following is NOT a property of a database?

Which of these would cause a runtime exception in Java?

What is Disk Defragmentation and why is it needed?